    001package net.minecraft.client.multiplayer;
    002
    003import cpw.mods.fml.relauncher.Side;
    004import cpw.mods.fml.relauncher.SideOnly;
    005import java.util.ArrayList;
    006import java.util.List;
    007import net.minecraft.entity.EnumCreatureType;
    008import net.minecraft.util.IProgressUpdate;
    009import net.minecraft.util.LongHashMap;
    010import net.minecraft.world.ChunkCoordIntPair;
    011import net.minecraft.world.ChunkPosition;
    012import net.minecraft.world.World;
    013import net.minecraft.world.chunk.Chunk;
    014import net.minecraft.world.chunk.EmptyChunk;
    015import net.minecraft.world.chunk.IChunkProvider;
    016import net.minecraftforge.common.MinecraftForge;
    017import net.minecraftforge.event.world.ChunkEvent;
    018
    019@SideOnly(Side.CLIENT)
    020public class ChunkProviderClient implements IChunkProvider
    021{
    022    /**
    023     * The completely empty chunk used by ChunkProviderClient when chunkMapping doesn't contain the requested
    024     * coordinates.
    025     */
    026    private Chunk blankChunk;
    027
    028    /**
    029     * The mapping between ChunkCoordinates and Chunks that ChunkProviderClient maintains.
    030     */
    031    private LongHashMap chunkMapping = new LongHashMap();
    032
    033    /**
    034     * This may have been intended to be an iterable version of all currently loaded chunks (MultiplayerChunkCache),
    035     * with identical contents to chunkMapping's values. However it is never actually added to.
    036     */
    037    private List chunkListing = new ArrayList();
    038
    039    /** Reference to the World object. */
    040    private World worldObj;
    041
    042    public ChunkProviderClient(World par1World)
    043    {
    044        this.blankChunk = new EmptyChunk(par1World, 0, 0);
    045        this.worldObj = par1World;
    046    }
    047
    048    /**
    049     * Checks to see if a chunk exists at x, y
    050     */
    051    public boolean chunkExists(int par1, int par2)
    052    {
    053        return true;
    054    }
    055
    056    /**
    057     * Unload chunk from ChunkProviderClient's hashmap. Called in response to a Packet50PreChunk with its mode field set
    058     * to false
    059     */
    060    public void unloadChunk(int par1, int par2)
    061    {
    062        Chunk chunk = this.provideChunk(par1, par2);
    063
    064        if (!chunk.isEmpty())
    065        {
    066            chunk.onChunkUnload();
    067        }
    068
    069        this.chunkMapping.remove(ChunkCoordIntPair.chunkXZ2Int(par1, par2));
    070        this.chunkListing.remove(chunk);
    071    }
    072
    073    /**
    074     * loads or generates the chunk at the chunk location specified
    075     */
    076    public Chunk loadChunk(int par1, int par2)
    077    {
    078        Chunk chunk = new Chunk(this.worldObj, par1, par2);
    079        this.chunkMapping.add(ChunkCoordIntPair.chunkXZ2Int(par1, par2), chunk);
    080        MinecraftForge.EVENT_BUS.post(new ChunkEvent.Load(chunk));
    081        chunk.isChunkLoaded = true;
    082        return chunk;
    083    }
    084
    085    /**
    086     * Will return back a chunk, if it doesn't exist and its not a MP client it will generates all the blocks for the
    087     * specified chunk from the map seed and chunk seed
    088     */
    089    public Chunk provideChunk(int par1, int par2)
    090    {
    091        Chunk chunk = (Chunk)this.chunkMapping.getValueByKey(ChunkCoordIntPair.chunkXZ2Int(par1, par2));
    092        return chunk == null ? this.blankChunk : chunk;
    093    }
    094
    095    /**
    096     * Two modes of operation: if passed true, save all Chunks in one go.  If passed false, save up to two chunks.
    097     * Return true if all chunks have been saved.
    098     */
    099    public boolean saveChunks(boolean par1, IProgressUpdate par2IProgressUpdate)
    100    {
    101        return true;
    102    }
    103
    104    /**
    105     * Unloads chunks that are marked to be unloaded. This is not guaranteed to unload every such chunk.
    106     */
    107    public boolean unloadQueuedChunks()
    108    {
    109        return false;
    110    }
    111
    112    /**
    113     * Returns if the IChunkProvider supports saving.
    114     */
    115    public boolean canSave()
    116    {
    117        return false;
    118    }
    119
    120    /**
    121     * Populates chunk with ores etc etc
    122     */
    123    public void populate(IChunkProvider par1IChunkProvider, int par2, int par3) {}
    124
    125    /**
    126     * Converts the instance data to a readable string.
    127     */
    128    public String makeString()
    129    {
    130        return "MultiplayerChunkCache: " + this.chunkMapping.getNumHashElements();
    131    }
    132
    133    /**
    134     * Returns a list of creatures of the specified type that can spawn at the given location.
    135     */
    136    public List getPossibleCreatures(EnumCreatureType par1EnumCreatureType, int par2, int par3, int par4)
    137    {
    138        return null;
    139    }
    140
    141    /**
    142     * Returns the location of the closest structure of the specified type. If not found returns null.
    143     */
    144    public ChunkPosition findClosestStructure(World par1World, String par2Str, int par3, int par4, int par5)
    145    {
    146        return null;
    147    }
    148
    149    public int getLoadedChunkCount()
    150    {
    151        return this.chunkListing.size();
    152    }
    153
    154    public void recreateStructures(int par1, int par2) {}
    155}