Clean up ddutils and bug fixes

- Removed unused utils
 - Use Java 8 streams API
 - Fix calculation of pocket id from coordinates
 - Fix /pocket tab completion and null pointer

src/main/java/org/dimdev/ddutils/I18nUtils.java

@@ -8,7 +8,7 @@ import java.util.List;
 
 public final class I18nUtils {
     @SideOnly(Side.CLIENT)
-    public static void translateAndAdd(String key, List<String> list) { // TODO: move to utils?
+    public static void translateAndAdd(String key, List<String> list) {
         int i = 0;
         while (I18n.hasKey(key + Integer.toString(i))) {
             list.add(I18n.format(key + Integer.toString(i)));

src/main/java/org/dimdev/ddutils/StringUtils.java

@@ -1,56 +0,0 @@
-package org.dimdev.ddutils;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * @author Robijnvogel
- */
-public final class StringUtils {
-
-    public static char flipCase(char in) {
-        if (Character.isUpperCase(in)) {
-            return Character.toLowerCase(in);
-        } else {
-            return Character.toUpperCase(in);
-        }
-    }
-
-    public static List<String> getAsStringList(Integer[] integers) {
-        List<String> list = new ArrayList<>();
-        for (int integer : integers) {
-            list.add(String.valueOf(integer));
-        }
-        return list;
-    }
-
-    public static List<String> getMatchingStrings(String template, List<String> comparables, boolean caseSensitive) {
-        if (template.equals("")) {
-            return comparables;
-        }
-        List<String> results = new ArrayList<>();
-        for (String comparable : comparables) {
-            if (isStartOfString(template, comparable, caseSensitive)) {
-                results.add(comparable);
-            }
-        }
-        return results;
-    }
-
-    public static boolean isStartOfString(String template, String comparable, boolean caseSensitive) {
-        if (comparable.length() < template.length()) {
-            return false;
-        } else if (template.equals("")) {
-            return true;
-        }
-
-        for (int i = 0; i < template.length(); i++) {
-            char tChar = template.charAt(i);
-            char cChar = comparable.charAt(i);
-            if (tChar != cChar && !caseSensitive && flipCase(tChar) == cChar) {
-                return false;
-            }
-        }
-        return true;
-    }
-}

src/main/java/org/dimdev/ddutils/math/GridUtils.java

@@ -32,15 +32,14 @@ public final class GridUtils {
      * @param pos The location on the grid
      * @return The location on the grid
      */
-    public static int posToNum(GridPos pos) { // TODO: comments
+    public static int posToNum(GridPos pos) {
         int x = pos.getX();
         int z = pos.getZ();
-        if (x >= z) {
+        if (x >= z) { // First side
-            return x * x + z;
+            return x * x + z; // (number of points in the square x * x) + (z points on the top layer)
-        } else {
+        } else { // Second side
-            return (z + 2) * z - z;
+            return (z + 1) * z + z - x; // (number of points in the rectangle (z + 1) * z) + (z - x points on the top layer)
         }
     }
-
     // TODO: add more modes: hexagonal sphere packing and maybe spiral, triangle
 }

src/main/java/org/dimdev/ddutils/math/RandomUtils.java

@@ -1,106 +0,0 @@
-package org.dimdev.ddutils.math;
-
-import java.util.Random;
-
-/**
- * @author Robijnvogel
- */
-public final class RandomUtils { // These utils aren't being used by DimDoors!
-
-    /**
-     * Compares the integers in two arrays and returns true if any integer in
-     * the first set is within range 0 to {@code difference} - 1 of any integer
-     * in the second array.
-     *
-     * @param set1     the first integer array to compare
-     * @param difference see method description
-     * @param set2     the second integer array to compare
-     * @return {@code (\exists i, j; ; abs(set1[i] - set2[j]) < difference }
-     * @throws IllegalArgumentException if precondition is violated
-     * @pre difference >= 0
-     */
-    public static boolean withinDistanceOf(int[] set1, int difference, int[] set2) throws IllegalArgumentException {
-        if (difference < 0) throw new IllegalArgumentException("Difference must be larger than 0");
-        for (int e1 : set1) {
-            for (int e2 : set2) {
-                if (Math.max(e1, e2) - Math.min(e1, e2) < difference) return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Returns the sum of the values of all integer elements in an integer array
-     *
-     * @param intArray the integers to calculate the sum of
-     * @param flag     this flag is meant to check if all elements in the array must
-     *                 be positive (0), negative(1), or it doesn't matter (anything else)
-     * @return {@code sum(i = 0; intArray.has(i); intArray[i]) }
-     * @throws IllegalArgumentException if precondition is violated
-     * @pre {@code (flag != 0 && flag != 1) || (flag == 0 && (\forall i; intArray.has(i); i >= 0)) || (flag == 1 && (\forall i; intArray.has(i); i <= 0))}
-     */
-    public static int arraySum(int[] intArray, short flag) {
-        int r = 0;
-        for (int i : intArray) { //check flag
-            if (flag == 0 && i < 0) {
-                throw new IllegalArgumentException("all integers in array must be positive");
-            } else if (flag == 1 && i > 0) {
-                throw new IllegalArgumentException("all integers in array must be negative");
-            }
-            r += i;
-        }
-        return r;
-    }
-
-    /**
-     * Returns either true or false, based on a weighted random, taking in
-     * account the parameters as the weights for true and false as outcomes. For
-     * instance: (2, 3) should return true in 40% of the cases and false in 60%
-     * of the cases.
-     *
-     * @param trueWeight  the chance weight that this method will return true
-     * @param falseWeight the chance weight that this method will return false
-     * @return true or false
-     * @throws IllegalArgumentException if precondition is violated
-     * @pre {@code trueWeight > 0 && falseWeight > 0}
-     */
-    public static boolean weightedBoolean(int trueWeight, int falseWeight) {
-        if (trueWeight <= 0 || falseWeight <= 0) {
-            throw new IllegalArgumentException("Either of both weights were 0 or lower. Both should be at least 1.");
-        }
-        Random random = new Random();
-        return random.nextInt(trueWeight + falseWeight) < trueWeight;
-    }
-
-    /**
-     * This method returns the sum of {@code base} and a random element of
-     * {@code transformations} the weight of each of the entries in
-     *
-     * @param base            the base value to transform from
-     * @param transformations the possible transformations
-     * @param weights         the chance-weight of those transformations
-     * @return the sum of {@code base} and the value of an element in
-     * {@code transformations}
-     * @throws IllegalArgumentException if precondition is violated
-     * @pre {@code transformations.length = weights.length} && {@code (\forall i; intArray.has(i); i >= 0)}
-     * && {@code MathUtils.arraySum(weights, 1) > 0}
-     */
-    public static int transformRandomly(int base, int[] transformations, int[] weights) {
-        if (transformations.length != weights.length) {
-            throw new IllegalArgumentException("pre was violated, transformations.length != weights.length");
-        }
-        Random random = new Random();
-        int weightSum = arraySum(weights, (short) 0);
-        if (weightSum <= 0) {
-            throw new IllegalArgumentException("pre was violated, RandomUtils.arraySum(weights, 1) <= 0");
-        }
-        int choice = random.nextInt(weightSum);
-        for (int i = 0; i < weights.length; i++) {
-            choice -= weights[i];
-            if (choice < 0) {
-                return base + transformations[i];
-            }
-        }
-        throw new IllegalStateException("");
-    }
-}

src/main/java/org/dimdev/ddutils/nbt/NBTUtils.java

@@ -2,23 +2,18 @@ package org.dimdev.ddutils.nbt;
 
 import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
+import net.minecraft.nbt.NBTBase;
 import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
 import net.minecraft.util.math.Vec3i;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.util.HashMap;
 import java.util.Map;
 
-public final class NBTUtils { // TODO: make these fill rather than return a map
+public final class NBTUtils {
-    public static Map<String, Integer> readMapStringInteger(NBTTagCompound nbt) {
+    public static <T extends Map<String, Integer>> T readMapStringInteger(NBTTagCompound nbt, T map) {
-        HashMap<String, Integer> map = new HashMap<>();
-        for (String str : nbt.getKeySet()) {
-            map.put(str, nbt.getInteger(str));
-        }
-        return map;
-    }
-
-    public static BiMap<String, Integer> readBiMapStringInteger(NBTTagCompound nbt) {
-        BiMap<String, Integer> map = HashBiMap.create();
         for (String str : nbt.getKeySet()) {
             map.put(str, nbt.getInteger(str));
         }
@@ -33,6 +28,11 @@ public final class NBTUtils { // TODO: make these fill rather than return a map
         return tagCompound;
     }
 
+    public static <T extends INBTStorable> T readNBTStorable(T obj, NBTTagCompound nbt) {
+        obj.readFromNBT(nbt);
+        return obj;
+    }
+
     public static Vec3i readVec3i(NBTTagCompound nbt) {
         return new Vec3i(nbt.getInteger("x"), nbt.getInteger("y"), nbt.getInteger("z"));
     }

src/main/java/org/dimdev/dimdoors/shared/SchematicHandler.java

@@ -211,12 +211,16 @@ public class SchematicHandler { // TODO: make this more general (not dimdoors-re
 
     // LOADING CODE ENDS HERE </editor-fold>
 
-    public ArrayList<String> getTemplateGroups() {
+    public Set<String> getTemplateGroups() {
-        return new ArrayList<>(nameMap.keySet());
+        return nameMap.keySet();
     }
 
-    public ArrayList<String> getTemplateNames(String group) {
+    public Set<String> getTemplateNames(String group) {
-        return new ArrayList<>(nameMap.get(group).keySet()); // TODO: null pointer here
+        if (nameMap.containsKey(group)) {
+            return nameMap.get(group).keySet();
+        } else {
+            return new HashSet<>();
+        }
     }
 
     /**

src/main/java/org/dimdev/dimdoors/shared/commands/CommandDimTeleport.java

@@ -2,9 +2,11 @@ package org.dimdev.dimdoors.shared.commands;
 
 import org.dimdev.dimdoors.DimDoors;
 import org.dimdev.ddutils.Location;
-import org.dimdev.ddutils.StringUtils;
+
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
 import javax.annotation.Nullable;
 
 import org.dimdev.ddutils.TeleportUtils;
@@ -78,9 +80,12 @@ public class CommandDimTeleport extends CommandBase { // TODO: localization
     @Override
     public List<String> getTabCompletions(MinecraftServer server, ICommandSender sender, String[] args, @Nullable BlockPos targetPos) {
         if (args.length == 1) {
-            List<String> list = StringUtils.getAsStringList(DimensionManager.getIDs());
+            return Arrays.stream(DimensionManager.getIDs())
-            return StringUtils.getMatchingStrings(args[0], list, false);
+                    .map(Object::toString)
-        }
+                    .filter(s -> s.toLowerCase().startsWith(args[0].toLowerCase()))
+                    .collect(Collectors.toList());
+        } else {
             return new ArrayList<>();
         }
+    }
 }

src/main/java/org/dimdev/dimdoors/shared/commands/CommandPocket.java

@@ -5,7 +5,6 @@ import org.dimdev.dimdoors.shared.*;
 import org.dimdev.dimdoors.shared.pockets.*;
 import org.dimdev.dimdoors.shared.rifts.TileEntityRift;
 import org.dimdev.ddutils.Location;
-import org.dimdev.ddutils.StringUtils;
 import org.dimdev.ddutils.TeleportUtils;
 import org.dimdev.ddutils.WorldUtils;
 import org.dimdev.dimdoors.shared.world.DimDoorDimensions;
@@ -20,6 +19,7 @@ import net.minecraft.util.text.TextComponentString;
 import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class CommandPocket extends CommandBase {
 
@@ -110,16 +110,18 @@ public class CommandPocket extends CommandBase {
         List<String> list = new ArrayList<>();
         switch (args.length) {
             case 1:
-                list = SchematicHandler.INSTANCE.getTemplateGroups();
+                list = new ArrayList<>(SchematicHandler.INSTANCE.getTemplateGroups());
                 break;
             case 2:
-                list = SchematicHandler.INSTANCE.getTemplateNames(args[0]);
+                list = new ArrayList<>(SchematicHandler.INSTANCE.getTemplateNames(args[0]));
                 break;
             case 3:
                 list.add("true");
                 list.add("false");
                 break;
         }
-        return StringUtils.getMatchingStrings(args[0], list, false);
+        return list.stream()
+                .filter(s -> s.toLowerCase().startsWith(args[args.length - 1].toLowerCase()))
+                .collect(Collectors.toList());
     }
 }

src/main/java/org/dimdev/dimdoors/shared/pockets/Pocket.java

@@ -1,5 +1,6 @@
 package org.dimdev.dimdoors.shared.pockets;
 
+import org.dimdev.ddutils.nbt.INBTStorable;
 import org.dimdev.dimdoors.shared.VirtualLocation;
 import org.dimdev.dimdoors.shared.rifts.*;
 import org.dimdev.dimdoors.shared.tileentities.TileEntityEntranceRift;
@@ -14,7 +15,7 @@ import net.minecraft.nbt.*;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.math.BlockPos;
 
-public class Pocket { // TODO: better visibilities
+public class Pocket implements INBTStorable{ // TODO: better visibilities
 
     @Getter private int id;
     @Getter private int x; // Grid x TODO: rename to gridX and gridY
@@ -26,9 +27,9 @@ public class Pocket { // TODO: better visibilities
 
     @Getter int dimID; // Not saved
 
-    private Pocket() {}
+    public Pocket() {}
 
-    Pocket(int id, int dimID, int x, int z) {
+    public Pocket(int id, int dimID, int x, int z) {
         this.id = id;
         this.dimID = dimID;
         this.x = x;
@@ -36,35 +37,33 @@ public class Pocket { // TODO: better visibilities
         riftLocations = new ArrayList<>();
     }
 
-    static Pocket readFromNBT(NBTTagCompound nbt) {
+    @Override
-        Pocket pocket = new Pocket();
+    public /*static Pocket*/ void readFromNBT(NBTTagCompound nbt) {
-        pocket.id = nbt.getInteger("id");
+        id = nbt.getInteger("id");
-        pocket.x = nbt.getInteger("x");
+        x = nbt.getInteger("x");
-        pocket.z = nbt.getInteger("z");
+        z = nbt.getInteger("z");
-        pocket.size = nbt.getInteger("size");
+        size = nbt.getInteger("size");
-        if (nbt.hasKey("virtualLocation")) pocket.virtualLocation = VirtualLocation.readFromNBT(nbt.getCompoundTag("virtualLocation"));
+        if (nbt.hasKey("virtualLocation")) virtualLocation = VirtualLocation.readFromNBT(nbt.getCompoundTag("virtualLocation"));
-        if (nbt.hasKey("entrance")) pocket.entrance = Location.readFromNBT(nbt.getCompoundTag("entrance"));
+        if (nbt.hasKey("entrance")) entrance = Location.readFromNBT(nbt.getCompoundTag("entrance"));
 
-        pocket.riftLocations = new ArrayList<>();
+        riftLocations = new ArrayList<>();
         NBTTagList riftLocationsNBT = (NBTTagList) nbt.getTag("riftLocations");
         for (NBTBase riftLocationNBT : riftLocationsNBT) {
-            pocket.riftLocations.add(Location.readFromNBT((NBTTagCompound) riftLocationNBT));
+            riftLocations.add(Location.readFromNBT((NBTTagCompound) riftLocationNBT));
+        }
     }
 
-        return pocket;
+    @Override
-    }
+    public /*static*/ NBTTagCompound writeToNBT(NBTTagCompound nbt) {
-
+        nbt.setInteger("id", id);
-    static NBTBase writeToNBT(Pocket pocket) {
+        nbt.setInteger("x", x);
-        NBTTagCompound nbt = new NBTTagCompound();
+        nbt.setInteger("z", z);
-        nbt.setInteger("id", pocket.id);
+        nbt.setInteger("size", size);
-        nbt.setInteger("x", pocket.x);
+        if (virtualLocation != null) nbt.setTag("virtualLocation", virtualLocation.writeToNBT());
-        nbt.setInteger("z", pocket.z);
+        if (entrance != null) nbt.setTag("entrance", Location.writeToNBT(entrance));
-        nbt.setInteger("size", pocket.size);
-        if (pocket.virtualLocation != null) nbt.setTag("virtualLocation", pocket.virtualLocation.writeToNBT());
-        if (pocket.entrance != null) nbt.setTag("entrance", Location.writeToNBT(pocket.entrance));
 
         NBTTagList riftLocationsNBT = new NBTTagList();
-        for (Location loc : pocket.riftLocations) {
+        for (Location loc : riftLocations) {
             riftLocationsNBT.appendTag(Location.writeToNBT(loc));
         }
         nbt.setTag("riftLocations", riftLocationsNBT);

src/main/java/org/dimdev/dimdoors/shared/pockets/PocketRegistry.java

@@ -87,14 +87,14 @@ public class PocketRegistry extends WorldSavedData { // TODO: unregister pocket
         maxPocketSize = nbt.getInteger("maxPocketSize");
         privatePocketSize = nbt.getInteger("privatePocketSize");
         publicPocketSize = nbt.getInteger("publicPocketSize");
-        privatePocketMap = NBTUtils.readBiMapStringInteger(nbt.getCompoundTag("privatePocketMap"));
+        privatePocketMap = NBTUtils.readMapStringInteger(nbt.getCompoundTag("privatePocketMap"), HashBiMap.create());
         nextID = nbt.getInteger("nextID");
 
         pockets = new HashMap<>();
         NBTTagList pocketsNBT = (NBTTagList) nbt.getTag("pockets");
         for (NBTBase pocketNBT : pocketsNBT) { // TODO: convert to map to be able to skip IDs efficiently
             NBTTagCompound pocketNBTC = (NBTTagCompound) pocketNBT;
-            pockets.put(pocketNBTC.getInteger("id"), Pocket.readFromNBT(pocketNBTC));
+            pockets.put(pocketNBTC.getInteger("id"), NBTUtils.readNBTStorable(new Pocket(), (NBTTagCompound) pocketNBT));
         }
 
         for (Pocket pocket : pockets.values()) {
@@ -133,7 +133,7 @@ public class PocketRegistry extends WorldSavedData { // TODO: unregister pocket
         NBTTagList pocketsNBT = new NBTTagList();
         for (Map.Entry<Integer, Pocket> pocketEntry : pockets.entrySet()) {
             if (pocketEntry.getValue() == null) continue;
-            NBTTagCompound pocketNBT = (NBTTagCompound) Pocket.writeToNBT(pocketEntry.getValue());
+            NBTTagCompound pocketNBT = (NBTTagCompound) pocketEntry.getValue().writeToNBT(new NBTTagCompound());
             pocketNBT.setInteger("id", pocketEntry.getKey()); // TODO: store separately?
             pocketsNBT.appendTag(pocketNBT);
         }