/*
* 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.world.storage;
import com.sk89q.jnbt.CompoundTag;
import com.sk89q.jnbt.Tag;
import com.sk89q.worldedit.BlockVector2D;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.Vector2D;
import com.sk89q.worldedit.world.DataException;
import com.sk89q.worldedit.world.World;
import com.sk89q.worldedit.world.chunk.AnvilChunk;
import com.sk89q.worldedit.world.chunk.Chunk;
import com.sk89q.worldedit.world.chunk.OldChunk;
import java.io.IOException;
import java.util.Map;
/**
* Represents chunk storage mechanisms.
*/
public abstract class ChunkStore {
/**
* >> to chunk
* << from chunk
*/
public static final int CHUNK_SHIFTS = 4;
/**
* Convert a position to a chunk.
*
* @param position the position
* @return chunk coordinates
*/
public static BlockVector2D toChunk(Vector position) {
int chunkX = (int) Math.floor(position.getBlockX() / 16.0);
int chunkZ = (int) Math.floor(position.getBlockZ() / 16.0);
return new BlockVector2D(chunkX, chunkZ);
}
/**
* Get the tag for a chunk.
*
* @param position the position of the chunk
* @return tag
* @throws DataException thrown on data error
* @throws IOException thrown on I/O error
*/
public abstract CompoundTag getChunkTag(Vector2D position, World world) throws DataException, IOException;
/**
* Get a chunk at a location.
*
* @param position the position of the chunk
* @return a chunk
* @throws ChunkStoreException thrown if there is an error from the chunk store
* @throws DataException thrown on data error
* @throws IOException thrown on I/O error
*/
public Chunk getChunk(Vector2D position, World world) throws DataException, IOException {
CompoundTag tag = getChunkTag(position, world);
Map<String, Tag> tags = tag.getValue();
if (tags.containsKey("Sections")) {
return new AnvilChunk(world, tag);
}
return new OldChunk(world, tag);
}
/**
* Close resources.
*
* @throws IOException on I/O error
*/
public void close() throws IOException {
}
/**
* Returns whether the chunk store is of this type.
*
* @return true if valid
*/
public abstract boolean isValid();
}