167 lines
2.8 KiB
Java
167 lines
2.8 KiB
Java
package appeng.services.helpers;
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import java.io.File;
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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public class CompassRegion
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{
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final int low_x;
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final int low_z;
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final int hi_x;
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final int hi_z;
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final int world;
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boolean hasFile = false;
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final File rootFolder;
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RandomAccessFile raf = null;
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ByteBuffer buffer;
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public void close()
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{
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try
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{
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if ( hasFile )
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{
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buffer = null;
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raf.close();
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raf = null;
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hasFile = false;
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}
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}
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catch (Throwable t)
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{
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throw new CompassException( t );
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}
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}
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public CompassRegion(int cx, int cz, int worldID, File rootFolder) {
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world = worldID;
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this.rootFolder = rootFolder;
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int region_x = cx >> 10;
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int region_z = cz >> 10;
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low_x = region_x << 10;
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low_z = region_z << 10;
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hi_x = low_x + 1024;
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hi_z = low_z + 1024;
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openFile( false );
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}
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public boolean hasBeacon(int cx, int cz)
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{
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if ( hasFile )
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{
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cx = cx & 0x3FF;
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cz = cz & 0x3FF;
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int val = read( cx, cz );
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if ( val != 0 )
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return true;
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}
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return false;
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}
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public void setHasBeacon(int cx, int cz, int cdy, boolean hasBeacon)
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{
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cx &= 0x3FF;
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cz &= 0x3FF;
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openFile( hasBeacon );
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if ( hasFile )
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{
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int val = read( cx, cz );
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int originalVal = val;
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if ( hasBeacon )
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val |= 1 << cdy;
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else
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val &= ~(1 << cdy);
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if ( originalVal != val )
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write( cx, cz, val );
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}
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}
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private void write(int cx, int cz, int val)
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{
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try
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{
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buffer.put( cx + cz * 0x400, (byte) val );
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// raf.seek( cx + cz * 0x400 );
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// raf.writeByte( val );
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}
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catch (Throwable t)
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{
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throw new CompassException( t );
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}
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}
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private int read(int cx, int cz)
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{
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try
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{
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return buffer.get( cx + cz * 0x400 );
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// raf.seek( cx + cz * 0x400 );
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// return raf.readByte();
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}
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catch (IndexOutOfBoundsException outofBounds)
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{
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return 0;
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}
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catch (Throwable t)
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{
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throw new CompassException( t );
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}
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}
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private void openFile(boolean create)
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{
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File fName = getFileName();
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if ( hasFile )
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return;
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if ( create || fileExists( fName ) )
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{
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try
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{
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raf = new RandomAccessFile( fName, "rw" );
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FileChannel fc = raf.getChannel();
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buffer = fc.map( FileChannel.MapMode.READ_WRITE, 0, 0x400 * 0x400 );// fc.size() );
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hasFile = true;
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}
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catch (Throwable t)
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{
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throw new CompassException( t );
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}
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}
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}
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private boolean fileExists(File name)
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{
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return name.exists() && name.isFile();
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}
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private File getFileName()
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{
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String folder = rootFolder.getPath() + File.separatorChar + "compass";
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File folderFile = new File( folder );
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if ( !folderFile.exists() || !folderFile.isDirectory() )
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folderFile.mkdir();
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return new File( folder + File.separatorChar + world + "_" + low_x + "_" + low_z + ".dat" );
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}
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}
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