/*
* 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.cache;
import com.sk89q.worldedit.BlockVector;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.blocks.BaseBlock;
import com.sk89q.worldedit.extent.AbstractDelegateExtent;
import com.sk89q.worldedit.extent.Extent;
/**
* Returns the same cached {@link BaseBlock} for repeated calls to
* {@link #getLazyBlock(Vector)} with the same position.
*/
public class LastAccessExtentCache extends AbstractDelegateExtent {
private CachedBlock lastBlock;
/**
* Create a new instance.
*
* @param extent the extent
*/
public LastAccessExtentCache(Extent extent) {
super(extent);
}
@Override
public BaseBlock getLazyBlock(Vector position) {
BlockVector blockVector = position.toBlockVector();
CachedBlock lastBlock = this.lastBlock;
if (lastBlock != null && lastBlock.position.equals(blockVector)) {
return lastBlock.block;
} else {
BaseBlock block = super.getLazyBlock(position);
this.lastBlock = new CachedBlock(blockVector, block);
return block;
}
}
private static class CachedBlock {
private final BlockVector position;
private final BaseBlock block;
private CachedBlock(BlockVector position, BaseBlock block) {
this.position = position;
this.block = block;
}
}
}