Many fixes for buffered extents

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -565,12 +565,12 @@ public class EditSession implements Extent, AutoCloseable {
 
     @Override
     public BlockState getBlock(BlockVector3 position) {
-        return world.getBlock(position);
+        return bypassNone.getBlock(position);
     }
 
     @Override
     public BaseBlock getFullBlock(BlockVector3 position) {
-        return world.getFullBlock(position);
+        return bypassNone.getFullBlock(position);
     }
 
     /**

worldedit-core/src/main/java/com/sk89q/worldedit/extent/AbstractBufferingExtent.java

@@ -0,0 +1,48 @@
+package com.sk89q.worldedit.extent;
+
+import com.sk89q.worldedit.WorldEditException;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.world.block.BaseBlock;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockStateHolder;
+
+import java.util.Optional;
+
+/**
+ * Base extent class for buffering changes between {@link #setBlock(BlockVector3, BlockStateHolder)}
+ * and the delegate extent. This class ensures that {@link #getBlock(BlockVector3)} is properly
+ * handled, by returning buffered blocks.
+ */
+public abstract class AbstractBufferingExtent extends AbstractDelegateExtent {
+    /**
+     * Create a new instance.
+     *
+     * @param extent the extent
+     */
+    protected AbstractBufferingExtent(Extent extent) {
+        super(extent);
+    }
+
+    @Override
+    public abstract <T extends BlockStateHolder<T>> boolean setBlock(BlockVector3 location, T block) throws WorldEditException;
+
+    protected final <T extends BlockStateHolder<T>> boolean setDelegateBlock(BlockVector3 location, T block) throws WorldEditException {
+        return super.setBlock(location, block);
+    }
+
+    @Override
+    public BlockState getBlock(BlockVector3 position) {
+        return getBufferedBlock(position)
+            .map(BaseBlock::toImmutableState)
+            .orElseGet(() -> super.getBlock(position));
+    }
+
+    @Override
+    public BaseBlock getFullBlock(BlockVector3 position) {
+        return getBufferedBlock(position)
+            .orElseGet(() -> super.getFullBlock(position));
+    }
+
+    protected abstract Optional<BaseBlock> getBufferedBlock(BlockVector3 position);
+
+}

worldedit-core/src/main/java/com/sk89q/worldedit/extent/buffer/ExtentBuffer.java

@@ -21,16 +21,16 @@ package com.sk89q.worldedit.extent.buffer;
 
 import com.google.common.collect.Maps;
 import com.sk89q.worldedit.WorldEditException;
-import com.sk89q.worldedit.extent.AbstractDelegateExtent;
+import com.sk89q.worldedit.extent.AbstractBufferingExtent;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.function.mask.Masks;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.world.block.BaseBlock;
-import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 
 import java.util.Map;
+import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -38,7 +38,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
  * Buffers changes to an {@link Extent} and allows retrieval of the changed blocks,
  * without modifying the underlying extent.
  */
-public class ExtentBuffer extends AbstractDelegateExtent {
+public class ExtentBuffer extends AbstractBufferingExtent {
 
     private final Map<BlockVector3, BaseBlock> buffer = Maps.newHashMap();
     private final Mask mask;
@@ -67,23 +67,11 @@ public class ExtentBuffer extends AbstractDelegateExtent {
     }
 
     @Override
-    public BlockState getBlock(BlockVector3 position) {
+    protected Optional<BaseBlock> getBufferedBlock(BlockVector3 position) {
         if (mask.test(position)) {
-            return getOrDefault(position).toImmutableState();
+            return Optional.of(buffer.computeIfAbsent(position, (pos -> getExtent().getFullBlock(pos))));
         }
-        return super.getBlock(position);
-    }
-
-    @Override
-    public BaseBlock getFullBlock(BlockVector3 position) {
-        if (mask.test(position)) {
-            return getOrDefault(position);
-        }
-        return super.getFullBlock(position);
-    }
-
-    private BaseBlock getOrDefault(BlockVector3 position) {
-        return buffer.computeIfAbsent(position, (pos -> getExtent().getFullBlock(pos)));
+        return Optional.empty();
     }
 
     @Override

worldedit-core/src/main/java/com/sk89q/worldedit/extent/reorder/ChunkBatchingExtent.java

@@ -22,14 +22,13 @@ package com.sk89q.worldedit.extent.reorder;
 import com.google.common.collect.Table;
 import com.google.common.collect.TreeBasedTable;
 import com.sk89q.worldedit.WorldEditException;
-import com.sk89q.worldedit.extent.AbstractDelegateExtent;
+import com.sk89q.worldedit.extent.AbstractBufferingExtent;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.function.operation.RunContext;
 import com.sk89q.worldedit.math.BlockVector2;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.world.block.BaseBlock;
-import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 
 import java.util.Comparator;
@@ -37,6 +36,7 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 
 /**
@@ -45,7 +45,7 @@ import java.util.Set;
  * loaded repeatedly, however it does take more memory due to caching the
  * blocks.
  */
-public class ChunkBatchingExtent extends AbstractDelegateExtent {
+public class ChunkBatchingExtent extends AbstractBufferingExtent {
 
     /**
      * Comparator optimized for sorting chunks by the region file they reside
@@ -92,7 +92,7 @@ public class ChunkBatchingExtent extends AbstractDelegateExtent {
     @Override
     public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 location, B block) throws WorldEditException {
         if (!enabled) {
-            return getExtent().setBlock(location, block);
+            return setDelegateBlock(location, block);
         }
         BlockVector2 chunkPos = getChunkPos(location);
         BlockVector3 inChunkPos = getInChunkPos(location);
@@ -102,28 +102,11 @@ public class ChunkBatchingExtent extends AbstractDelegateExtent {
     }
 
     @Override
-    public BlockState getBlock(BlockVector3 position) {
-        BaseBlock internal = getInternalBlock(position);
-        if (internal != null) {
-            return internal.toImmutableState();
-        }
-        return super.getBlock(position);
-    }
-
-    @Override
-    public BaseBlock getFullBlock(BlockVector3 position) {
-        BaseBlock internal = getInternalBlock(position);
-        if (internal != null) {
-            return internal;
-        }
-        return super.getFullBlock(position);
-    }
-
-    private BaseBlock getInternalBlock(BlockVector3 position) {
+    protected Optional<BaseBlock> getBufferedBlock(BlockVector3 position) {
         if (!containedBlocks.contains(position)) {
-            return null;
+            return Optional.empty();
         }
-        return batches.get(getChunkPos(position), getInChunkPos(position));
+        return Optional.of(batches.get(getChunkPos(position), getInChunkPos(position)));
     }
 
     @Override
@@ -134,19 +117,20 @@ public class ChunkBatchingExtent extends AbstractDelegateExtent {
         return new Operation() {
 
             // we get modified between create/resume -- only create this on resume to prevent CME
-            private Iterator<Map<BlockVector3, BaseBlock>> batchIterator;
+            private Iterator<Map.Entry<BlockVector2, Map<BlockVector3, BaseBlock>>> batchIterator;
 
             @Override
             public Operation resume(RunContext run) throws WorldEditException {
                 if (batchIterator == null) {
-                    batchIterator = batches.rowMap().values().iterator();
+                    batchIterator = batches.rowMap().entrySet().iterator();
                 }
                 if (!batchIterator.hasNext()) {
                     return null;
                 }
-                Map<BlockVector3, BaseBlock> next = batchIterator.next();
-                for (Map.Entry<BlockVector3, BaseBlock> block : next.entrySet()) {
-                    getExtent().setBlock(block.getKey(), block.getValue());
+                Map.Entry<BlockVector2, Map<BlockVector3, BaseBlock>> next = batchIterator.next();
+                BlockVector3 chunkOffset = next.getKey().toBlockVector3().shl(4);
+                for (Map.Entry<BlockVector3, BaseBlock> block : next.getValue().entrySet()) {
+                    getExtent().setBlock(block.getKey().add(chunkOffset), block.getValue());
                     containedBlocks.remove(block.getKey());
                 }
                 batchIterator.remove();

worldedit-core/src/main/java/com/sk89q/worldedit/extent/reorder/MultiStageReorder.java

@@ -20,7 +20,7 @@
 package com.sk89q.worldedit.extent.reorder;
 
 import com.sk89q.worldedit.WorldEditException;
-import com.sk89q.worldedit.extent.AbstractDelegateExtent;
+import com.sk89q.worldedit.extent.AbstractBufferingExtent;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.function.operation.OperationQueue;
@@ -36,13 +36,17 @@ import com.sk89q.worldedit.world.block.BlockTypes;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
 
 /**
  * Re-orders blocks into several stages.
  */
-public class MultiStageReorder extends AbstractDelegateExtent implements ReorderingExtent {
+public class MultiStageReorder extends AbstractBufferingExtent implements ReorderingExtent {
 
     private static final Map<BlockType, PlacementPriority> priorityMap = new HashMap<>();
 
@@ -139,6 +143,7 @@ public class MultiStageReorder extends AbstractDelegateExtent implements Reorder
         priorityMap.put(BlockTypes.MOVING_PISTON, PlacementPriority.FINAL);
     }
 
+    private final Set<BlockVector3> containedBlocks = new HashSet<>();
     private Map<PlacementPriority, LocatedBlockList> stages = new HashMap<>();
 
     private boolean enabled;
@@ -212,7 +217,7 @@ public class MultiStageReorder extends AbstractDelegateExtent implements Reorder
     @Override
     public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 location, B block) throws WorldEditException {
         if (!enabled) {
-            return super.setBlock(location, block);
+            return setDelegateBlock(location, block);
         }
 
         BlockState existing = getBlock(location);
@@ -240,9 +245,21 @@ public class MultiStageReorder extends AbstractDelegateExtent implements Reorder
         }
 
         stages.get(priority).add(location, block);
+        containedBlocks.add(location);
         return !existing.equalsFuzzy(block);
     }
 
+    @Override
+    protected Optional<BaseBlock> getBufferedBlock(BlockVector3 position) {
+        if (!containedBlocks.contains(position)) {
+            return Optional.empty();
+        }
+        return stages.values().stream()
+            .map(blocks -> blocks.get(position))
+            .filter(Objects::nonNull)
+            .findAny();
+    }
+
     @Override
     public Operation commitBefore() {
         if (!commitRequired()) {

worldedit-core/src/main/java/com/sk89q/worldedit/math/BlockVector3.java

@@ -366,6 +366,28 @@ public final class BlockVector3 {
         return shr(n, n, n);
     }
 
+    /**
+     * Shift all components left.
+     *
+     * @param x the value to shift x by
+     * @param y the value to shift y by
+     * @param z the value to shift z by
+     * @return a new vector
+     */
+    public BlockVector3 shl(int x, int y, int z) {
+        return at(this.x << x, this.y << y, this.z << z);
+    }
+
+    /**
+     * Shift all components left by {@code n}.
+     *
+     * @param n the value to shift by
+     * @return a new vector
+     */
+    public BlockVector3 shl(int n) {
+        return shl(n, n, n);
+    }
+
     /**
      * Get the length of the vector.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/util/collection/LocatedBlockList.java

@@ -21,68 +21,72 @@ package com.sk89q.worldedit.util.collection;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.common.collect.ImmutableList;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.util.LocatedBlock;
+import com.sk89q.worldedit.world.block.BaseBlock;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 
+import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.ListIterator;
+import java.util.Map;
 
 /**
  * Wrapper around a list of blocks located in the world.
  */
 public class LocatedBlockList implements Iterable<LocatedBlock> {
 
-    private final List<LocatedBlock> list;
+    private final Map<BlockVector3, LocatedBlock> map = new LinkedHashMap<>();
 
     public LocatedBlockList() {
-        list = new ArrayList<>();
     }
 
     public LocatedBlockList(Collection<? extends LocatedBlock> collection) {
-        list = new ArrayList<>(collection);
+        for (LocatedBlock locatedBlock : collection) {
+            map.put(locatedBlock.getLocation(), locatedBlock);
+        }
     }
 
     public void add(LocatedBlock setBlockCall) {
         checkNotNull(setBlockCall);
-        list.add(setBlockCall);
+        map.put(setBlockCall.getLocation(), setBlockCall);
     }
 
     public <B extends BlockStateHolder<B>> void add(BlockVector3 location, B block) {
         add(new LocatedBlock(location, block.toBaseBlock()));
     }
 
+    public boolean containsLocation(BlockVector3 location) {
+        return map.containsKey(location);
+    }
+
+    public @Nullable BaseBlock get(BlockVector3 location) {
+        return map.get(location).getBlock();
+    }
+
     public int size() {
-        return list.size();
+        return map.size();
     }
 
     public void clear() {
-        list.clear();
+        map.clear();
     }
 
     @Override
     public Iterator<LocatedBlock> iterator() {
-        return list.iterator();
+        return map.values().iterator();
     }
 
     public Iterator<LocatedBlock> reverseIterator() {
-        return new Iterator<LocatedBlock>() {
-
-            private final ListIterator<LocatedBlock> backingIterator = list.listIterator(list.size());
-
-            @Override
-            public boolean hasNext() {
-                return backingIterator.hasPrevious();
-            }
-
-            @Override
-            public LocatedBlock next() {
-                return backingIterator.previous();
-            }
-        };
+        List<LocatedBlock> data = new ArrayList<>(map.values());
+        Collections.reverse(data);
+        return data.iterator();
     }
 
 }