mirror of
https://github.com/go-gitea/gitea
synced 2024-12-30 02:44:36 +01:00
1345 lines
39 KiB
Go
1345 lines
39 KiB
Go
// Package roaring is an implementation of Roaring Bitmaps in Go.
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// They provide fast compressed bitmap data structures (also called bitset).
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// They are ideally suited to represent sets of integers over
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// relatively small ranges.
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// See http://roaringbitmap.org for details.
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package roaring
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import (
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"bufio"
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"bytes"
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"encoding/base64"
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"fmt"
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"io"
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"strconv"
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)
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// Bitmap represents a compressed bitmap where you can add integers.
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type Bitmap struct {
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highlowcontainer roaringArray
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}
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// ToBase64 serializes a bitmap as Base64
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func (rb *Bitmap) ToBase64() (string, error) {
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buf := new(bytes.Buffer)
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_, err := rb.WriteTo(buf)
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return base64.StdEncoding.EncodeToString(buf.Bytes()), err
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}
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// FromBase64 deserializes a bitmap from Base64
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func (rb *Bitmap) FromBase64(str string) (int64, error) {
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data, err := base64.StdEncoding.DecodeString(str)
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if err != nil {
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return 0, err
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}
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buf := bytes.NewBuffer(data)
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return rb.ReadFrom(buf)
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}
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// WriteTo writes a serialized version of this bitmap to stream.
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// The format is compatible with other RoaringBitmap
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// implementations (Java, C) and is documented here:
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// https://github.com/RoaringBitmap/RoaringFormatSpec
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func (rb *Bitmap) WriteTo(stream io.Writer) (int64, error) {
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return rb.highlowcontainer.writeTo(stream)
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}
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// ToBytes returns an array of bytes corresponding to what is written
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// when calling WriteTo
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func (rb *Bitmap) ToBytes() ([]byte, error) {
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return rb.highlowcontainer.toBytes()
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}
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// WriteToMsgpack writes a msgpack2/snappy-streaming compressed serialized
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// version of this bitmap to stream. The format is not
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// compatible with the WriteTo() format, and is
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// experimental: it may produce smaller on disk
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// footprint and/or be faster to read, depending
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// on your content. Currently only the Go roaring
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// implementation supports this format.
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func (rb *Bitmap) WriteToMsgpack(stream io.Writer) (int64, error) {
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return 0, rb.highlowcontainer.writeToMsgpack(stream)
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}
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// ReadFrom reads a serialized version of this bitmap from stream.
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// The format is compatible with other RoaringBitmap
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// implementations (Java, C) and is documented here:
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// https://github.com/RoaringBitmap/RoaringFormatSpec
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func (rb *Bitmap) ReadFrom(stream io.Reader) (int64, error) {
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return rb.highlowcontainer.readFrom(stream)
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}
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// FromBuffer creates a bitmap from its serialized version stored in buffer
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//
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// The format specification is available here:
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// https://github.com/RoaringBitmap/RoaringFormatSpec
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//
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// The provided byte array (buf) is expected to be a constant.
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// The function makes the best effort attempt not to copy data.
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// You should take care not to modify buff as it will
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// likely result in unexpected program behavior.
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//
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// Resulting bitmaps are effectively immutable in the following sense:
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// a copy-on-write marker is used so that when you modify the resulting
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// bitmap, copies of selected data (containers) are made.
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// You should *not* change the copy-on-write status of the resulting
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// bitmaps (SetCopyOnWrite).
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//
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func (rb *Bitmap) FromBuffer(buf []byte) (int64, error) {
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return rb.highlowcontainer.fromBuffer(buf)
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}
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// RunOptimize attempts to further compress the runs of consecutive values found in the bitmap
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func (rb *Bitmap) RunOptimize() {
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rb.highlowcontainer.runOptimize()
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}
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// HasRunCompression returns true if the bitmap benefits from run compression
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func (rb *Bitmap) HasRunCompression() bool {
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return rb.highlowcontainer.hasRunCompression()
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}
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// ReadFromMsgpack reads a msgpack2/snappy-streaming serialized
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// version of this bitmap from stream. The format is
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// expected is that written by the WriteToMsgpack()
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// call; see additional notes there.
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func (rb *Bitmap) ReadFromMsgpack(stream io.Reader) (int64, error) {
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return 0, rb.highlowcontainer.readFromMsgpack(stream)
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}
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// MarshalBinary implements the encoding.BinaryMarshaler interface for the bitmap
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func (rb *Bitmap) MarshalBinary() ([]byte, error) {
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var buf bytes.Buffer
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writer := bufio.NewWriter(&buf)
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_, err := rb.WriteTo(writer)
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if err != nil {
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return nil, err
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}
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err = writer.Flush()
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface for the bitmap
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func (rb *Bitmap) UnmarshalBinary(data []byte) error {
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var buf bytes.Buffer
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_, err := buf.Write(data)
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if err != nil {
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return err
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}
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reader := bufio.NewReader(&buf)
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_, err = rb.ReadFrom(reader)
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return err
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}
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// NewBitmap creates a new empty Bitmap (see also New)
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func NewBitmap() *Bitmap {
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return &Bitmap{}
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}
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// New creates a new empty Bitmap (same as NewBitmap)
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func New() *Bitmap {
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return &Bitmap{}
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}
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// Clear resets the Bitmap to be logically empty, but may retain
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// some memory allocations that may speed up future operations
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func (rb *Bitmap) Clear() {
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rb.highlowcontainer.clear()
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}
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// ToArray creates a new slice containing all of the integers stored in the Bitmap in sorted order
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func (rb *Bitmap) ToArray() []uint32 {
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array := make([]uint32, rb.GetCardinality())
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pos := 0
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pos2 := 0
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for pos < rb.highlowcontainer.size() {
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hs := uint32(rb.highlowcontainer.getKeyAtIndex(pos)) << 16
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c := rb.highlowcontainer.getContainerAtIndex(pos)
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pos++
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c.fillLeastSignificant16bits(array, pos2, hs)
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pos2 += c.getCardinality()
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}
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return array
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}
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// GetSizeInBytes estimates the memory usage of the Bitmap. Note that this
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// might differ slightly from the amount of bytes required for persistent storage
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func (rb *Bitmap) GetSizeInBytes() uint64 {
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size := uint64(8)
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for _, c := range rb.highlowcontainer.containers {
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size += uint64(2) + uint64(c.getSizeInBytes())
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}
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return size
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}
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// GetSerializedSizeInBytes computes the serialized size in bytes
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// of the Bitmap. It should correspond to the
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// number of bytes written when invoking WriteTo. You can expect
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// that this function is much cheaper computationally than WriteTo.
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func (rb *Bitmap) GetSerializedSizeInBytes() uint64 {
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return rb.highlowcontainer.serializedSizeInBytes()
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}
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// BoundSerializedSizeInBytes returns an upper bound on the serialized size in bytes
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// assuming that one wants to store "cardinality" integers in [0, universe_size)
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func BoundSerializedSizeInBytes(cardinality uint64, universeSize uint64) uint64 {
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contnbr := (universeSize + uint64(65535)) / uint64(65536)
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if contnbr > cardinality {
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contnbr = cardinality
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// we can't have more containers than we have values
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}
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headermax := 8*contnbr + 4
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if 4 > (contnbr+7)/8 {
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headermax += 4
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} else {
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headermax += (contnbr + 7) / 8
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}
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valsarray := uint64(arrayContainerSizeInBytes(int(cardinality)))
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valsbitmap := contnbr * uint64(bitmapContainerSizeInBytes())
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valsbest := valsarray
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if valsbest > valsbitmap {
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valsbest = valsbitmap
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}
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return valsbest + headermax
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}
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// IntIterable allows you to iterate over the values in a Bitmap
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type IntIterable interface {
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HasNext() bool
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Next() uint32
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}
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type intIterator struct {
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pos int
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hs uint32
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iter shortIterable
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highlowcontainer *roaringArray
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}
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// HasNext returns true if there are more integers to iterate over
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func (ii *intIterator) HasNext() bool {
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return ii.pos < ii.highlowcontainer.size()
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}
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func (ii *intIterator) init() {
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if ii.highlowcontainer.size() > ii.pos {
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ii.iter = ii.highlowcontainer.getContainerAtIndex(ii.pos).getShortIterator()
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ii.hs = uint32(ii.highlowcontainer.getKeyAtIndex(ii.pos)) << 16
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}
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}
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// Next returns the next integer
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func (ii *intIterator) Next() uint32 {
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x := uint32(ii.iter.next()) | ii.hs
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if !ii.iter.hasNext() {
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ii.pos = ii.pos + 1
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ii.init()
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}
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return x
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}
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func newIntIterator(a *Bitmap) *intIterator {
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p := new(intIterator)
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p.pos = 0
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p.highlowcontainer = &a.highlowcontainer
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p.init()
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return p
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}
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// ManyIntIterable allows you to iterate over the values in a Bitmap
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type ManyIntIterable interface {
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// pass in a buffer to fill up with values, returns how many values were returned
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NextMany([]uint32) int
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}
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type manyIntIterator struct {
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pos int
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hs uint32
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iter manyIterable
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highlowcontainer *roaringArray
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}
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func (ii *manyIntIterator) init() {
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if ii.highlowcontainer.size() > ii.pos {
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ii.iter = ii.highlowcontainer.getContainerAtIndex(ii.pos).getManyIterator()
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ii.hs = uint32(ii.highlowcontainer.getKeyAtIndex(ii.pos)) << 16
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} else {
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ii.iter = nil
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}
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}
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func (ii *manyIntIterator) NextMany(buf []uint32) int {
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n := 0
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for n < len(buf) {
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if ii.iter == nil {
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break
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}
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moreN := ii.iter.nextMany(ii.hs, buf[n:])
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n += moreN
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if moreN == 0 {
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ii.pos = ii.pos + 1
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ii.init()
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}
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}
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return n
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}
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func newManyIntIterator(a *Bitmap) *manyIntIterator {
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p := new(manyIntIterator)
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p.pos = 0
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p.highlowcontainer = &a.highlowcontainer
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p.init()
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return p
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}
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// String creates a string representation of the Bitmap
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func (rb *Bitmap) String() string {
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// inspired by https://github.com/fzandona/goroar/
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var buffer bytes.Buffer
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start := []byte("{")
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buffer.Write(start)
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i := rb.Iterator()
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counter := 0
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if i.HasNext() {
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counter = counter + 1
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buffer.WriteString(strconv.FormatInt(int64(i.Next()), 10))
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}
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for i.HasNext() {
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buffer.WriteString(",")
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counter = counter + 1
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// to avoid exhausting the memory
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if counter > 0x40000 {
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buffer.WriteString("...")
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break
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}
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buffer.WriteString(strconv.FormatInt(int64(i.Next()), 10))
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}
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buffer.WriteString("}")
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return buffer.String()
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}
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// Iterator creates a new IntIterable to iterate over the integers contained in the bitmap, in sorted order
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func (rb *Bitmap) Iterator() IntIterable {
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return newIntIterator(rb)
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}
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// Iterator creates a new ManyIntIterable to iterate over the integers contained in the bitmap, in sorted order
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func (rb *Bitmap) ManyIterator() ManyIntIterable {
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return newManyIntIterator(rb)
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}
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// Clone creates a copy of the Bitmap
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func (rb *Bitmap) Clone() *Bitmap {
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ptr := new(Bitmap)
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ptr.highlowcontainer = *rb.highlowcontainer.clone()
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return ptr
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}
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// Minimum get the smallest value stored in this roaring bitmap, assumes that it is not empty
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func (rb *Bitmap) Minimum() uint32 {
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return uint32(rb.highlowcontainer.containers[0].minimum()) | (uint32(rb.highlowcontainer.keys[0]) << 16)
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}
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// Maximum get the largest value stored in this roaring bitmap, assumes that it is not empty
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func (rb *Bitmap) Maximum() uint32 {
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lastindex := len(rb.highlowcontainer.containers) - 1
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return uint32(rb.highlowcontainer.containers[lastindex].maximum()) | (uint32(rb.highlowcontainer.keys[lastindex]) << 16)
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}
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// Contains returns true if the integer is contained in the bitmap
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func (rb *Bitmap) Contains(x uint32) bool {
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hb := highbits(x)
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c := rb.highlowcontainer.getContainer(hb)
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return c != nil && c.contains(lowbits(x))
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}
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// ContainsInt returns true if the integer is contained in the bitmap (this is a convenience method, the parameter is casted to uint32 and Contains is called)
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func (rb *Bitmap) ContainsInt(x int) bool {
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return rb.Contains(uint32(x))
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}
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// Equals returns true if the two bitmaps contain the same integers
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func (rb *Bitmap) Equals(o interface{}) bool {
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srb, ok := o.(*Bitmap)
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if ok {
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return srb.highlowcontainer.equals(rb.highlowcontainer)
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}
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return false
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}
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// Add the integer x to the bitmap
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func (rb *Bitmap) Add(x uint32) {
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hb := highbits(x)
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ra := &rb.highlowcontainer
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i := ra.getIndex(hb)
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if i >= 0 {
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var c container
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c = ra.getWritableContainerAtIndex(i).iaddReturnMinimized(lowbits(x))
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rb.highlowcontainer.setContainerAtIndex(i, c)
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} else {
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newac := newArrayContainer()
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rb.highlowcontainer.insertNewKeyValueAt(-i-1, hb, newac.iaddReturnMinimized(lowbits(x)))
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}
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}
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// add the integer x to the bitmap, return the container and its index
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func (rb *Bitmap) addwithptr(x uint32) (int, container) {
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hb := highbits(x)
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ra := &rb.highlowcontainer
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i := ra.getIndex(hb)
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var c container
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if i >= 0 {
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c = ra.getWritableContainerAtIndex(i).iaddReturnMinimized(lowbits(x))
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rb.highlowcontainer.setContainerAtIndex(i, c)
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return i, c
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}
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newac := newArrayContainer()
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c = newac.iaddReturnMinimized(lowbits(x))
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rb.highlowcontainer.insertNewKeyValueAt(-i-1, hb, c)
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return -i - 1, c
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}
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// CheckedAdd adds the integer x to the bitmap and return true if it was added (false if the integer was already present)
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func (rb *Bitmap) CheckedAdd(x uint32) bool {
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// TODO: add unit tests for this method
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hb := highbits(x)
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i := rb.highlowcontainer.getIndex(hb)
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if i >= 0 {
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C := rb.highlowcontainer.getWritableContainerAtIndex(i)
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oldcard := C.getCardinality()
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C = C.iaddReturnMinimized(lowbits(x))
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rb.highlowcontainer.setContainerAtIndex(i, C)
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return C.getCardinality() > oldcard
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}
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newac := newArrayContainer()
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rb.highlowcontainer.insertNewKeyValueAt(-i-1, hb, newac.iaddReturnMinimized(lowbits(x)))
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return true
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}
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// AddInt adds the integer x to the bitmap (convenience method: the parameter is casted to uint32 and we call Add)
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func (rb *Bitmap) AddInt(x int) {
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rb.Add(uint32(x))
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}
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// Remove the integer x from the bitmap
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func (rb *Bitmap) Remove(x uint32) {
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hb := highbits(x)
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i := rb.highlowcontainer.getIndex(hb)
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if i >= 0 {
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c := rb.highlowcontainer.getWritableContainerAtIndex(i).iremoveReturnMinimized(lowbits(x))
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rb.highlowcontainer.setContainerAtIndex(i, c)
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if rb.highlowcontainer.getContainerAtIndex(i).getCardinality() == 0 {
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rb.highlowcontainer.removeAtIndex(i)
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}
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}
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}
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// CheckedRemove removes the integer x from the bitmap and return true if the integer was effectively remove (and false if the integer was not present)
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func (rb *Bitmap) CheckedRemove(x uint32) bool {
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// TODO: add unit tests for this method
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hb := highbits(x)
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i := rb.highlowcontainer.getIndex(hb)
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if i >= 0 {
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C := rb.highlowcontainer.getWritableContainerAtIndex(i)
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oldcard := C.getCardinality()
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C = C.iremoveReturnMinimized(lowbits(x))
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rb.highlowcontainer.setContainerAtIndex(i, C)
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if rb.highlowcontainer.getContainerAtIndex(i).getCardinality() == 0 {
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rb.highlowcontainer.removeAtIndex(i)
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return true
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}
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return C.getCardinality() < oldcard
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}
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return false
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}
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// IsEmpty returns true if the Bitmap is empty (it is faster than doing (GetCardinality() == 0))
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func (rb *Bitmap) IsEmpty() bool {
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return rb.highlowcontainer.size() == 0
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}
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// GetCardinality returns the number of integers contained in the bitmap
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func (rb *Bitmap) GetCardinality() uint64 {
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size := uint64(0)
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for _, c := range rb.highlowcontainer.containers {
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size += uint64(c.getCardinality())
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}
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return size
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}
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// Rank returns the number of integers that are smaller or equal to x (Rank(infinity) would be GetCardinality())
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func (rb *Bitmap) Rank(x uint32) uint64 {
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size := uint64(0)
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for i := 0; i < rb.highlowcontainer.size(); i++ {
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key := rb.highlowcontainer.getKeyAtIndex(i)
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if key > highbits(x) {
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return size
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}
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if key < highbits(x) {
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size += uint64(rb.highlowcontainer.getContainerAtIndex(i).getCardinality())
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} else {
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return size + uint64(rb.highlowcontainer.getContainerAtIndex(i).rank(lowbits(x)))
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}
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}
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return size
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}
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// Select returns the xth integer in the bitmap
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func (rb *Bitmap) Select(x uint32) (uint32, error) {
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if rb.GetCardinality() <= uint64(x) {
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return 0, fmt.Errorf("can't find %dth integer in a bitmap with only %d items", x, rb.GetCardinality())
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}
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remaining := x
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for i := 0; i < rb.highlowcontainer.size(); i++ {
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c := rb.highlowcontainer.getContainerAtIndex(i)
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if remaining >= uint32(c.getCardinality()) {
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remaining -= uint32(c.getCardinality())
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} else {
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key := rb.highlowcontainer.getKeyAtIndex(i)
|
|
return uint32(key)<<16 + uint32(c.selectInt(uint16(remaining))), nil
|
|
}
|
|
}
|
|
return 0, fmt.Errorf("can't find %dth integer in a bitmap with only %d items", x, rb.GetCardinality())
|
|
}
|
|
|
|
// And computes the intersection between two bitmaps and stores the result in the current bitmap
|
|
func (rb *Bitmap) And(x2 *Bitmap) {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
intersectionsize := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
|
|
main:
|
|
for {
|
|
if pos1 < length1 && pos2 < length2 {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 == s2 {
|
|
c1 := rb.highlowcontainer.getWritableContainerAtIndex(pos1)
|
|
c2 := x2.highlowcontainer.getContainerAtIndex(pos2)
|
|
diff := c1.iand(c2)
|
|
if diff.getCardinality() > 0 {
|
|
rb.highlowcontainer.replaceKeyAndContainerAtIndex(intersectionsize, s1, diff, false)
|
|
intersectionsize++
|
|
}
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else if s1 < s2 {
|
|
pos1 = rb.highlowcontainer.advanceUntil(s2, pos1)
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else { //s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
rb.highlowcontainer.resize(intersectionsize)
|
|
}
|
|
|
|
// OrCardinality returns the cardinality of the union between two bitmaps, bitmaps are not modified
|
|
func (rb *Bitmap) OrCardinality(x2 *Bitmap) uint64 {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
answer := uint64(0)
|
|
main:
|
|
for {
|
|
if (pos1 < length1) && (pos2 < length2) {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
|
|
for {
|
|
if s1 < s2 {
|
|
answer += uint64(rb.highlowcontainer.getContainerAtIndex(pos1).getCardinality())
|
|
pos1++
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else if s1 > s2 {
|
|
answer += uint64(x2.highlowcontainer.getContainerAtIndex(pos2).getCardinality())
|
|
pos2++
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else {
|
|
// TODO: could be faster if we did not have to materialize the container
|
|
answer += uint64(rb.highlowcontainer.getContainerAtIndex(pos1).or(x2.highlowcontainer.getContainerAtIndex(pos2)).getCardinality())
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
for ; pos1 < length1; pos1++ {
|
|
answer += uint64(rb.highlowcontainer.getContainerAtIndex(pos1).getCardinality())
|
|
}
|
|
for ; pos2 < length2; pos2++ {
|
|
answer += uint64(x2.highlowcontainer.getContainerAtIndex(pos2).getCardinality())
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// AndCardinality returns the cardinality of the intersection between two bitmaps, bitmaps are not modified
|
|
func (rb *Bitmap) AndCardinality(x2 *Bitmap) uint64 {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
answer := uint64(0)
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
|
|
main:
|
|
for {
|
|
if pos1 < length1 && pos2 < length2 {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 == s2 {
|
|
c1 := rb.highlowcontainer.getContainerAtIndex(pos1)
|
|
c2 := x2.highlowcontainer.getContainerAtIndex(pos2)
|
|
answer += uint64(c1.andCardinality(c2))
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else if s1 < s2 {
|
|
pos1 = rb.highlowcontainer.advanceUntil(s2, pos1)
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else { //s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// Intersects checks whether two bitmap intersects, bitmaps are not modified
|
|
func (rb *Bitmap) Intersects(x2 *Bitmap) bool {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
|
|
main:
|
|
for {
|
|
if pos1 < length1 && pos2 < length2 {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 == s2 {
|
|
c1 := rb.highlowcontainer.getContainerAtIndex(pos1)
|
|
c2 := x2.highlowcontainer.getContainerAtIndex(pos2)
|
|
if c1.intersects(c2) {
|
|
return true
|
|
}
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else if s1 < s2 {
|
|
pos1 = rb.highlowcontainer.advanceUntil(s2, pos1)
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else { //s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Xor computes the symmetric difference between two bitmaps and stores the result in the current bitmap
|
|
func (rb *Bitmap) Xor(x2 *Bitmap) {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
for {
|
|
if (pos1 < length1) && (pos2 < length2) {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
if s1 < s2 {
|
|
pos1 = rb.highlowcontainer.advanceUntil(s2, pos1)
|
|
if pos1 == length1 {
|
|
break
|
|
}
|
|
} else if s1 > s2 {
|
|
c := x2.highlowcontainer.getWritableContainerAtIndex(pos2)
|
|
rb.highlowcontainer.insertNewKeyValueAt(pos1, x2.highlowcontainer.getKeyAtIndex(pos2), c)
|
|
length1++
|
|
pos1++
|
|
pos2++
|
|
} else {
|
|
// TODO: couple be computed in-place for reduced memory usage
|
|
c := rb.highlowcontainer.getContainerAtIndex(pos1).xor(x2.highlowcontainer.getContainerAtIndex(pos2))
|
|
if c.getCardinality() > 0 {
|
|
rb.highlowcontainer.setContainerAtIndex(pos1, c)
|
|
pos1++
|
|
} else {
|
|
rb.highlowcontainer.removeAtIndex(pos1)
|
|
length1--
|
|
}
|
|
pos2++
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
if pos1 == length1 {
|
|
rb.highlowcontainer.appendCopyMany(x2.highlowcontainer, pos2, length2)
|
|
}
|
|
}
|
|
|
|
// Or computes the union between two bitmaps and stores the result in the current bitmap
|
|
func (rb *Bitmap) Or(x2 *Bitmap) {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
main:
|
|
for (pos1 < length1) && (pos2 < length2) {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
|
|
for {
|
|
if s1 < s2 {
|
|
pos1++
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else if s1 > s2 {
|
|
rb.highlowcontainer.insertNewKeyValueAt(pos1, s2, x2.highlowcontainer.getContainerAtIndex(pos2).clone())
|
|
pos1++
|
|
length1++
|
|
pos2++
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else {
|
|
rb.highlowcontainer.replaceKeyAndContainerAtIndex(pos1, s1, rb.highlowcontainer.getWritableContainerAtIndex(pos1).ior(x2.highlowcontainer.getContainerAtIndex(pos2)), false)
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
}
|
|
if pos1 == length1 {
|
|
rb.highlowcontainer.appendCopyMany(x2.highlowcontainer, pos2, length2)
|
|
}
|
|
}
|
|
|
|
/*func (rb *Bitmap) Or(x2 *Bitmap) {
|
|
results := Or(rb, x2) // Todo: could be computed in-place for reduced memory usage
|
|
rb.highlowcontainer = results.highlowcontainer
|
|
}*/
|
|
|
|
// AndNot computes the difference between two bitmaps and stores the result in the current bitmap
|
|
func (rb *Bitmap) AndNot(x2 *Bitmap) {
|
|
pos1 := 0
|
|
pos2 := 0
|
|
intersectionsize := 0
|
|
length1 := rb.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
|
|
main:
|
|
for {
|
|
if pos1 < length1 && pos2 < length2 {
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 == s2 {
|
|
c1 := rb.highlowcontainer.getWritableContainerAtIndex(pos1)
|
|
c2 := x2.highlowcontainer.getContainerAtIndex(pos2)
|
|
diff := c1.iandNot(c2)
|
|
if diff.getCardinality() > 0 {
|
|
rb.highlowcontainer.replaceKeyAndContainerAtIndex(intersectionsize, s1, diff, false)
|
|
intersectionsize++
|
|
}
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else if s1 < s2 {
|
|
c1 := rb.highlowcontainer.getContainerAtIndex(pos1)
|
|
mustCopyOnWrite := rb.highlowcontainer.needsCopyOnWrite(pos1)
|
|
rb.highlowcontainer.replaceKeyAndContainerAtIndex(intersectionsize, s1, c1, mustCopyOnWrite)
|
|
intersectionsize++
|
|
pos1++
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else { //s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
// TODO:implement as a copy
|
|
for pos1 < length1 {
|
|
c1 := rb.highlowcontainer.getContainerAtIndex(pos1)
|
|
s1 := rb.highlowcontainer.getKeyAtIndex(pos1)
|
|
mustCopyOnWrite := rb.highlowcontainer.needsCopyOnWrite(pos1)
|
|
rb.highlowcontainer.replaceKeyAndContainerAtIndex(intersectionsize, s1, c1, mustCopyOnWrite)
|
|
intersectionsize++
|
|
pos1++
|
|
}
|
|
rb.highlowcontainer.resize(intersectionsize)
|
|
}
|
|
|
|
// Or computes the union between two bitmaps and returns the result
|
|
func Or(x1, x2 *Bitmap) *Bitmap {
|
|
answer := NewBitmap()
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := x1.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
main:
|
|
for (pos1 < length1) && (pos2 < length2) {
|
|
s1 := x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
|
|
for {
|
|
if s1 < s2 {
|
|
answer.highlowcontainer.appendCopy(x1.highlowcontainer, pos1)
|
|
pos1++
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else if s1 > s2 {
|
|
answer.highlowcontainer.appendCopy(x2.highlowcontainer, pos2)
|
|
pos2++
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else {
|
|
|
|
answer.highlowcontainer.appendContainer(s1, x1.highlowcontainer.getContainerAtIndex(pos1).or(x2.highlowcontainer.getContainerAtIndex(pos2)), false)
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
}
|
|
if pos1 == length1 {
|
|
answer.highlowcontainer.appendCopyMany(x2.highlowcontainer, pos2, length2)
|
|
} else if pos2 == length2 {
|
|
answer.highlowcontainer.appendCopyMany(x1.highlowcontainer, pos1, length1)
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// And computes the intersection between two bitmaps and returns the result
|
|
func And(x1, x2 *Bitmap) *Bitmap {
|
|
answer := NewBitmap()
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := x1.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
main:
|
|
for pos1 < length1 && pos2 < length2 {
|
|
s1 := x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 == s2 {
|
|
C := x1.highlowcontainer.getContainerAtIndex(pos1)
|
|
C = C.and(x2.highlowcontainer.getContainerAtIndex(pos2))
|
|
|
|
if C.getCardinality() > 0 {
|
|
answer.highlowcontainer.appendContainer(s1, C, false)
|
|
}
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else if s1 < s2 {
|
|
pos1 = x1.highlowcontainer.advanceUntil(s2, pos1)
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else { // s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// Xor computes the symmetric difference between two bitmaps and returns the result
|
|
func Xor(x1, x2 *Bitmap) *Bitmap {
|
|
answer := NewBitmap()
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := x1.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
for {
|
|
if (pos1 < length1) && (pos2 < length2) {
|
|
s1 := x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
if s1 < s2 {
|
|
answer.highlowcontainer.appendCopy(x1.highlowcontainer, pos1)
|
|
pos1++
|
|
} else if s1 > s2 {
|
|
answer.highlowcontainer.appendCopy(x2.highlowcontainer, pos2)
|
|
pos2++
|
|
} else {
|
|
c := x1.highlowcontainer.getContainerAtIndex(pos1).xor(x2.highlowcontainer.getContainerAtIndex(pos2))
|
|
if c.getCardinality() > 0 {
|
|
answer.highlowcontainer.appendContainer(s1, c, false)
|
|
}
|
|
pos1++
|
|
pos2++
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
if pos1 == length1 {
|
|
answer.highlowcontainer.appendCopyMany(x2.highlowcontainer, pos2, length2)
|
|
} else if pos2 == length2 {
|
|
answer.highlowcontainer.appendCopyMany(x1.highlowcontainer, pos1, length1)
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// AndNot computes the difference between two bitmaps and returns the result
|
|
func AndNot(x1, x2 *Bitmap) *Bitmap {
|
|
answer := NewBitmap()
|
|
pos1 := 0
|
|
pos2 := 0
|
|
length1 := x1.highlowcontainer.size()
|
|
length2 := x2.highlowcontainer.size()
|
|
|
|
main:
|
|
for {
|
|
if pos1 < length1 && pos2 < length2 {
|
|
s1 := x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 := x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
for {
|
|
if s1 < s2 {
|
|
answer.highlowcontainer.appendCopy(x1.highlowcontainer, pos1)
|
|
pos1++
|
|
if pos1 == length1 {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
} else if s1 == s2 {
|
|
c1 := x1.highlowcontainer.getContainerAtIndex(pos1)
|
|
c2 := x2.highlowcontainer.getContainerAtIndex(pos2)
|
|
diff := c1.andNot(c2)
|
|
if diff.getCardinality() > 0 {
|
|
answer.highlowcontainer.appendContainer(s1, diff, false)
|
|
}
|
|
pos1++
|
|
pos2++
|
|
if (pos1 == length1) || (pos2 == length2) {
|
|
break main
|
|
}
|
|
s1 = x1.highlowcontainer.getKeyAtIndex(pos1)
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
} else { //s1 > s2
|
|
pos2 = x2.highlowcontainer.advanceUntil(s1, pos2)
|
|
if pos2 == length2 {
|
|
break main
|
|
}
|
|
s2 = x2.highlowcontainer.getKeyAtIndex(pos2)
|
|
}
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
if pos2 == length2 {
|
|
answer.highlowcontainer.appendCopyMany(x1.highlowcontainer, pos1, length1)
|
|
}
|
|
return answer
|
|
}
|
|
|
|
// AddMany add all of the values in dat
|
|
func (rb *Bitmap) AddMany(dat []uint32) {
|
|
if len(dat) == 0 {
|
|
return
|
|
}
|
|
prev := dat[0]
|
|
idx, c := rb.addwithptr(prev)
|
|
for _, i := range dat[1:] {
|
|
if highbits(prev) == highbits(i) {
|
|
c = c.iaddReturnMinimized(lowbits(i))
|
|
rb.highlowcontainer.setContainerAtIndex(idx, c)
|
|
} else {
|
|
idx, c = rb.addwithptr(i)
|
|
}
|
|
prev = i
|
|
}
|
|
}
|
|
|
|
// BitmapOf generates a new bitmap filled with the specified integers
|
|
func BitmapOf(dat ...uint32) *Bitmap {
|
|
ans := NewBitmap()
|
|
ans.AddMany(dat)
|
|
return ans
|
|
}
|
|
|
|
// Flip negates the bits in the given range (i.e., [rangeStart,rangeEnd)), any integer present in this range and in the bitmap is removed,
|
|
// and any integer present in the range and not in the bitmap is added.
|
|
// The function uses 64-bit parameters even though a Bitmap stores 32-bit values because it is allowed and meaningful to use [0,uint64(0x100000000)) as a range
|
|
// while uint64(0x100000000) cannot be represented as a 32-bit value.
|
|
func (rb *Bitmap) Flip(rangeStart, rangeEnd uint64) {
|
|
|
|
if rangeEnd > MaxUint32+1 {
|
|
panic("rangeEnd > MaxUint32+1")
|
|
}
|
|
if rangeStart > MaxUint32+1 {
|
|
panic("rangeStart > MaxUint32+1")
|
|
}
|
|
|
|
if rangeStart >= rangeEnd {
|
|
return
|
|
}
|
|
|
|
hbStart := highbits(uint32(rangeStart))
|
|
lbStart := lowbits(uint32(rangeStart))
|
|
hbLast := highbits(uint32(rangeEnd - 1))
|
|
lbLast := lowbits(uint32(rangeEnd - 1))
|
|
|
|
var max uint32 = maxLowBit
|
|
for hb := hbStart; hb <= hbLast; hb++ {
|
|
var containerStart uint32
|
|
if hb == hbStart {
|
|
containerStart = uint32(lbStart)
|
|
}
|
|
containerLast := max
|
|
if hb == hbLast {
|
|
containerLast = uint32(lbLast)
|
|
}
|
|
|
|
i := rb.highlowcontainer.getIndex(hb)
|
|
|
|
if i >= 0 {
|
|
c := rb.highlowcontainer.getWritableContainerAtIndex(i).inot(int(containerStart), int(containerLast)+1)
|
|
if c.getCardinality() > 0 {
|
|
rb.highlowcontainer.setContainerAtIndex(i, c)
|
|
} else {
|
|
rb.highlowcontainer.removeAtIndex(i)
|
|
}
|
|
} else { // *think* the range of ones must never be
|
|
// empty.
|
|
rb.highlowcontainer.insertNewKeyValueAt(-i-1, hb, rangeOfOnes(int(containerStart), int(containerLast)))
|
|
}
|
|
}
|
|
}
|
|
|
|
// FlipInt calls Flip after casting the parameters (convenience method)
|
|
func (rb *Bitmap) FlipInt(rangeStart, rangeEnd int) {
|
|
rb.Flip(uint64(rangeStart), uint64(rangeEnd))
|
|
}
|
|
|
|
// AddRange adds the integers in [rangeStart, rangeEnd) to the bitmap.
|
|
// The function uses 64-bit parameters even though a Bitmap stores 32-bit values because it is allowed and meaningful to use [0,uint64(0x100000000)) as a range
|
|
// while uint64(0x100000000) cannot be represented as a 32-bit value.
|
|
func (rb *Bitmap) AddRange(rangeStart, rangeEnd uint64) {
|
|
if rangeStart >= rangeEnd {
|
|
return
|
|
}
|
|
if rangeEnd-1 > MaxUint32 {
|
|
panic("rangeEnd-1 > MaxUint32")
|
|
}
|
|
hbStart := uint32(highbits(uint32(rangeStart)))
|
|
lbStart := uint32(lowbits(uint32(rangeStart)))
|
|
hbLast := uint32(highbits(uint32(rangeEnd - 1)))
|
|
lbLast := uint32(lowbits(uint32(rangeEnd - 1)))
|
|
|
|
var max uint32 = maxLowBit
|
|
for hb := uint16(hbStart); hb <= uint16(hbLast); hb++ {
|
|
containerStart := uint32(0)
|
|
if hb == uint16(hbStart) {
|
|
containerStart = lbStart
|
|
}
|
|
containerLast := max
|
|
if hb == uint16(hbLast) {
|
|
containerLast = lbLast
|
|
}
|
|
|
|
i := rb.highlowcontainer.getIndex(hb)
|
|
|
|
if i >= 0 {
|
|
c := rb.highlowcontainer.getWritableContainerAtIndex(i).iaddRange(int(containerStart), int(containerLast)+1)
|
|
rb.highlowcontainer.setContainerAtIndex(i, c)
|
|
} else { // *think* the range of ones must never be
|
|
// empty.
|
|
rb.highlowcontainer.insertNewKeyValueAt(-i-1, hb, rangeOfOnes(int(containerStart), int(containerLast)))
|
|
}
|
|
}
|
|
}
|
|
|
|
// RemoveRange removes the integers in [rangeStart, rangeEnd) from the bitmap.
|
|
// The function uses 64-bit parameters even though a Bitmap stores 32-bit values because it is allowed and meaningful to use [0,uint64(0x100000000)) as a range
|
|
// while uint64(0x100000000) cannot be represented as a 32-bit value.
|
|
func (rb *Bitmap) RemoveRange(rangeStart, rangeEnd uint64) {
|
|
if rangeStart >= rangeEnd {
|
|
return
|
|
}
|
|
if rangeEnd-1 > MaxUint32 {
|
|
// logically, we should assume that the user wants to
|
|
// remove all values from rangeStart to infinity
|
|
// see https://github.com/RoaringBitmap/roaring/issues/141
|
|
rangeEnd = uint64(0x100000000)
|
|
}
|
|
hbStart := uint32(highbits(uint32(rangeStart)))
|
|
lbStart := uint32(lowbits(uint32(rangeStart)))
|
|
hbLast := uint32(highbits(uint32(rangeEnd - 1)))
|
|
lbLast := uint32(lowbits(uint32(rangeEnd - 1)))
|
|
|
|
var max uint32 = maxLowBit
|
|
|
|
if hbStart == hbLast {
|
|
i := rb.highlowcontainer.getIndex(uint16(hbStart))
|
|
if i < 0 {
|
|
return
|
|
}
|
|
c := rb.highlowcontainer.getWritableContainerAtIndex(i).iremoveRange(int(lbStart), int(lbLast+1))
|
|
if c.getCardinality() > 0 {
|
|
rb.highlowcontainer.setContainerAtIndex(i, c)
|
|
} else {
|
|
rb.highlowcontainer.removeAtIndex(i)
|
|
}
|
|
return
|
|
}
|
|
ifirst := rb.highlowcontainer.getIndex(uint16(hbStart))
|
|
ilast := rb.highlowcontainer.getIndex(uint16(hbLast))
|
|
|
|
if ifirst >= 0 {
|
|
if lbStart != 0 {
|
|
c := rb.highlowcontainer.getWritableContainerAtIndex(ifirst).iremoveRange(int(lbStart), int(max+1))
|
|
if c.getCardinality() > 0 {
|
|
rb.highlowcontainer.setContainerAtIndex(ifirst, c)
|
|
ifirst++
|
|
}
|
|
}
|
|
} else {
|
|
ifirst = -ifirst - 1
|
|
}
|
|
if ilast >= 0 {
|
|
if lbLast != max {
|
|
c := rb.highlowcontainer.getWritableContainerAtIndex(ilast).iremoveRange(int(0), int(lbLast+1))
|
|
if c.getCardinality() > 0 {
|
|
rb.highlowcontainer.setContainerAtIndex(ilast, c)
|
|
} else {
|
|
ilast++
|
|
}
|
|
} else {
|
|
ilast++
|
|
}
|
|
} else {
|
|
ilast = -ilast - 1
|
|
}
|
|
rb.highlowcontainer.removeIndexRange(ifirst, ilast)
|
|
}
|
|
|
|
// Flip negates the bits in the given range (i.e., [rangeStart,rangeEnd)), any integer present in this range and in the bitmap is removed,
|
|
// and any integer present in the range and not in the bitmap is added, a new bitmap is returned leaving
|
|
// the current bitmap unchanged.
|
|
// The function uses 64-bit parameters even though a Bitmap stores 32-bit values because it is allowed and meaningful to use [0,uint64(0x100000000)) as a range
|
|
// while uint64(0x100000000) cannot be represented as a 32-bit value.
|
|
func Flip(bm *Bitmap, rangeStart, rangeEnd uint64) *Bitmap {
|
|
if rangeStart >= rangeEnd {
|
|
return bm.Clone()
|
|
}
|
|
|
|
if rangeStart > MaxUint32 {
|
|
panic("rangeStart > MaxUint32")
|
|
}
|
|
if rangeEnd-1 > MaxUint32 {
|
|
panic("rangeEnd-1 > MaxUint32")
|
|
}
|
|
|
|
answer := NewBitmap()
|
|
hbStart := highbits(uint32(rangeStart))
|
|
lbStart := lowbits(uint32(rangeStart))
|
|
hbLast := highbits(uint32(rangeEnd - 1))
|
|
lbLast := lowbits(uint32(rangeEnd - 1))
|
|
|
|
// copy the containers before the active area
|
|
answer.highlowcontainer.appendCopiesUntil(bm.highlowcontainer, hbStart)
|
|
|
|
var max uint32 = maxLowBit
|
|
for hb := hbStart; hb <= hbLast; hb++ {
|
|
var containerStart uint32
|
|
if hb == hbStart {
|
|
containerStart = uint32(lbStart)
|
|
}
|
|
containerLast := max
|
|
if hb == hbLast {
|
|
containerLast = uint32(lbLast)
|
|
}
|
|
|
|
i := bm.highlowcontainer.getIndex(hb)
|
|
j := answer.highlowcontainer.getIndex(hb)
|
|
|
|
if i >= 0 {
|
|
c := bm.highlowcontainer.getContainerAtIndex(i).not(int(containerStart), int(containerLast)+1)
|
|
if c.getCardinality() > 0 {
|
|
answer.highlowcontainer.insertNewKeyValueAt(-j-1, hb, c)
|
|
}
|
|
|
|
} else { // *think* the range of ones must never be
|
|
// empty.
|
|
answer.highlowcontainer.insertNewKeyValueAt(-j-1, hb,
|
|
rangeOfOnes(int(containerStart), int(containerLast)))
|
|
}
|
|
}
|
|
// copy the containers after the active area.
|
|
answer.highlowcontainer.appendCopiesAfter(bm.highlowcontainer, hbLast)
|
|
|
|
return answer
|
|
}
|
|
|
|
// SetCopyOnWrite sets this bitmap to use copy-on-write so that copies are fast and memory conscious
|
|
// if the parameter is true, otherwise we leave the default where hard copies are made
|
|
// (copy-on-write requires extra care in a threaded context).
|
|
// Calling SetCopyOnWrite(true) on a bitmap created with FromBuffer is unsafe.
|
|
func (rb *Bitmap) SetCopyOnWrite(val bool) {
|
|
rb.highlowcontainer.copyOnWrite = val
|
|
}
|
|
|
|
// GetCopyOnWrite gets this bitmap's copy-on-write property
|
|
func (rb *Bitmap) GetCopyOnWrite() (val bool) {
|
|
return rb.highlowcontainer.copyOnWrite
|
|
}
|
|
|
|
// FlipInt calls Flip after casting the parameters (convenience method)
|
|
func FlipInt(bm *Bitmap, rangeStart, rangeEnd int) *Bitmap {
|
|
return Flip(bm, uint64(rangeStart), uint64(rangeEnd))
|
|
}
|
|
|
|
// Statistics provides details on the container types in use.
|
|
type Statistics struct {
|
|
Cardinality uint64
|
|
Containers uint64
|
|
|
|
ArrayContainers uint64
|
|
ArrayContainerBytes uint64
|
|
ArrayContainerValues uint64
|
|
|
|
BitmapContainers uint64
|
|
BitmapContainerBytes uint64
|
|
BitmapContainerValues uint64
|
|
|
|
RunContainers uint64
|
|
RunContainerBytes uint64
|
|
RunContainerValues uint64
|
|
}
|
|
|
|
// Stats returns details on container type usage in a Statistics struct.
|
|
func (rb *Bitmap) Stats() Statistics {
|
|
stats := Statistics{}
|
|
stats.Containers = uint64(len(rb.highlowcontainer.containers))
|
|
for _, c := range rb.highlowcontainer.containers {
|
|
stats.Cardinality += uint64(c.getCardinality())
|
|
|
|
switch c.(type) {
|
|
case *arrayContainer:
|
|
stats.ArrayContainers++
|
|
stats.ArrayContainerBytes += uint64(c.getSizeInBytes())
|
|
stats.ArrayContainerValues += uint64(c.getCardinality())
|
|
case *bitmapContainer:
|
|
stats.BitmapContainers++
|
|
stats.BitmapContainerBytes += uint64(c.getSizeInBytes())
|
|
stats.BitmapContainerValues += uint64(c.getCardinality())
|
|
case *runContainer16:
|
|
stats.RunContainers++
|
|
stats.RunContainerBytes += uint64(c.getSizeInBytes())
|
|
stats.RunContainerValues += uint64(c.getCardinality())
|
|
}
|
|
}
|
|
return stats
|
|
}
|