Added new Extent-compatible Clipboard and BlockArrayClipboard classes.

The goal is to replace use of CuboidClipboard with these new classes.

Support for entities, //flip, //rotate, and //distr still needs to be
re-implemented.

DataException was also removed from BaseBlock because The Base(...)
classes should be "dumb" blocks without any validation.

src/main/java/com/sk89q/worldedit/extent/clipboard/BlockArrayClipboard.java

@@ -0,0 +1,160 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.extent.clipboard;
+
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.WorldEditException;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.blocks.BlockID;
+import com.sk89q.worldedit.entity.BaseEntity;
+import com.sk89q.worldedit.entity.Entity;
+import com.sk89q.worldedit.function.operation.Operation;
+import com.sk89q.worldedit.regions.Region;
+import com.sk89q.worldedit.util.Location;
+
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Stores block data as a multi-dimensional array of {@link BaseBlock}s and
+ * other data as lists or maps.
+ */
+public class BlockArrayClipboard implements Clipboard {
+
+    private final Region region;
+    private Vector offset = new Vector();
+    private final BaseBlock[][][] blocks;
+    private final List<ClipboardEntity> entities = new ArrayList<ClipboardEntity>();
+
+    /**
+     * Create a new instance.
+     *
+     * @param region the bounding region
+     */
+    public BlockArrayClipboard(Region region) {
+        checkNotNull(region);
+        checkNotNull(offset);
+        this.region = region.clone();
+
+        Vector dimensions = getDimensions();
+        blocks = new BaseBlock[dimensions.getBlockX()][dimensions.getBlockY()][dimensions.getBlockZ()];
+    }
+
+    @Override
+    public Region getRegion() {
+        return region.clone();
+    }
+
+    @Override
+    public Vector getOffset() {
+        return offset;
+    }
+
+    @Override
+    public void setOffset(Vector offset) {
+        checkNotNull(offset);
+        this.offset = offset;
+    }
+
+    /**
+     * Get the dimensions of the copy, which is at minimum (1, 1, 1).
+     *
+     * @return the dimensions
+     */
+    private Vector getDimensions() {
+        return region.getMaximumPoint().subtract(region.getMinimumPoint()).add(1, 1, 1);
+    }
+
+    @Override
+    public Vector getMinimumPoint() {
+        return region.getMinimumPoint();
+    }
+
+    @Override
+    public Vector getMaximumPoint() {
+        return region.getMaximumPoint();
+    }
+
+    @Override
+    public List<Entity> getEntities() {
+        return new ArrayList<Entity>(entities);
+    }
+
+    @Nullable
+    @Override
+    public Entity createEntity(Location location, BaseEntity entity) {
+        ClipboardEntity ret = new ClipboardEntity(location, entity);
+        entities.add(ret);
+        return ret;
+    }
+
+    @Override
+    public BaseBlock getBlock(Vector position) {
+        if (region.contains(position)) {
+            Vector v = position.subtract(region.getMinimumPoint());
+            BaseBlock block = blocks[v.getBlockX()][v.getBlockY()][v.getBlockZ()];
+            if (block != null) {
+                return new BaseBlock(block);
+            }
+        }
+
+        return new BaseBlock(BlockID.AIR);
+    }
+
+    @Override
+    public BaseBlock getLazyBlock(Vector position) {
+        return getBlock(position);
+    }
+
+    @Override
+    public boolean setBlock(Vector position, BaseBlock block) throws WorldEditException {
+        if (region.contains(position)) {
+            Vector v = position.subtract(region.getMinimumPoint());
+            blocks[v.getBlockX()][v.getBlockY()][v.getBlockZ()] = new BaseBlock(block);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Nullable
+    @Override
+    public Operation commit() {
+        return null;
+    }
+
+    /**
+     * Stores entity data.
+     */
+    private class ClipboardEntity extends StoredEntity {
+        ClipboardEntity(Location location, BaseEntity entity) {
+            super(location, entity);
+        }
+
+        @Override
+        public boolean remove() {
+            return entities.remove(this);
+        }
+    }
+
+}