Added getLazyBlock() to Extent for performance.

src/main/java/com/sk89q/worldedit/blocks/LazyBlock.java

@@ -0,0 +1,105 @@
+/*
+ * 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 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.blocks;
+
+import com.sk89q.jnbt.CompoundTag;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.data.DataException;
+import com.sk89q.worldedit.extent.Extent;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * A implementation of a lazy block for {@link Extent#getLazyBlock(Vector)}
+ * that takes the block's ID and metadata, but will defer loading of NBT
+ * data until time of access.
+ * </p>
+ * NBT data is later loaded using a call to {@link Extent#getBlock(Vector)}
+ * with a stored {@link Extent} and location.
+ * </p>
+ * All mutators on this object will throw an
+ * {@link UnsupportedOperationException}.
+ */
+public class LazyBlock extends BaseBlock {
+
+    private final Extent extent;
+    private final Vector position;
+    private boolean loaded = false;
+
+    /**
+     * Create a new lazy block.
+     *
+     * @param type the block type
+     * @param extent the extent to later load the full block data from
+     * @param position the position to later load the full block data from
+     */
+    public LazyBlock(int type, Extent extent, Vector position) {
+        super(type);
+        checkNotNull(extent);
+        checkNotNull(position);
+        this.extent = extent;
+        this.position = position;
+    }
+
+    /**
+     * Create a new lazy block.
+     *
+     * @param type the block type
+     * @param data the data value
+     * @param extent the extent to later load the full block data from
+     * @param position the position to later load the full block data from
+     */
+    public LazyBlock(int type, int data, Extent extent, Vector position) {
+        super(type, data);
+        checkNotNull(extent);
+        checkNotNull(position);
+        this.extent = extent;
+        this.position = position;
+    }
+
+    @Override
+    public void setId(int id) {
+        throw new UnsupportedOperationException("This object is immutable");
+    }
+
+    @Override
+    public void setData(int data) {
+        throw new UnsupportedOperationException("This object is immutable");
+    }
+
+    @Override
+    public CompoundTag getNbtData() {
+        if (!loaded) {
+            BaseBlock loadedBlock = extent.getBlock(position);
+            try {
+                super.setNbtData(loadedBlock.getNbtData());
+            } catch (DataException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return super.getNbtData();
+    }
+
+    @Override
+    public void setNbtData(CompoundTag nbtData) throws DataException {
+        throw new UnsupportedOperationException("This object is immutable");
+    }
+
+}