001package net.minecraft.world.chunk;
002
003import java.util.List;
004import net.minecraft.entity.EnumCreatureType;
005import net.minecraft.util.IProgressUpdate;
006import net.minecraft.world.ChunkPosition;
007import net.minecraft.world.World;
008
009public interface IChunkProvider
010{
011    /**
012     * Checks to see if a chunk exists at x, y
013     */
014    boolean chunkExists(int i, int j);
015
016    /**
017     * Will return back a chunk, if it doesn't exist and its not a MP client it will generates all the blocks for the
018     * specified chunk from the map seed and chunk seed
019     */
020    Chunk provideChunk(int i, int j);
021
022    /**
023     * loads or generates the chunk at the chunk location specified
024     */
025    Chunk loadChunk(int i, int j);
026
027    /**
028     * Populates chunk with ores etc etc
029     */
030    void populate(IChunkProvider ichunkprovider, int i, int j);
031
032    /**
033     * Two modes of operation: if passed true, save all Chunks in one go.  If passed false, save up to two chunks.
034     * Return true if all chunks have been saved.
035     */
036    boolean saveChunks(boolean flag, IProgressUpdate iprogressupdate);
037
038    /**
039     * Unloads chunks that are marked to be unloaded. This is not guaranteed to unload every such chunk.
040     */
041    boolean unloadQueuedChunks();
042
043    /**
044     * Returns if the IChunkProvider supports saving.
045     */
046    boolean canSave();
047
048    /**
049     * Converts the instance data to a readable string.
050     */
051    String makeString();
052
053    /**
054     * Returns a list of creatures of the specified type that can spawn at the given location.
055     */
056    List getPossibleCreatures(EnumCreatureType enumcreaturetype, int i, int j, int k);
057
058    /**
059     * Returns the location of the closest structure of the specified type. If not found returns null.
060     */
061    ChunkPosition findClosestStructure(World world, String s, int i, int j, int k);
062
063    int getLoadedChunkCount();
064
065    void recreateStructures(int i, int j);
066}