package net.minecraft.world.biome;
import java.util.ArrayList;
import java.util.List;
import net.minecraft.util.LongHashMap;
public class BiomeCache
{
/** Reference to the WorldChunkManager */
private final WorldChunkManager chunkManager;
/** The last time this BiomeCache was cleaned, in milliseconds. */
private long lastCleanupTime = 0L;
/**
* The map of keys to BiomeCacheBlocks. Keys are based on the chunk x, z coordinates as (x | z << 32).
*/
private LongHashMap cacheMap = new LongHashMap();
/** The list of cached BiomeCacheBlocks */
private List cache = new ArrayList();
public BiomeCache(WorldChunkManager par1WorldChunkManager)
{
this.chunkManager = par1WorldChunkManager;
}
/**
* Returns a biome cache block at location specified.
*/
public BiomeCacheBlock getBiomeCacheBlock(int par1, int par2)
{
par1 >>= 4;
par2 >>= 4;
long var3 = (long)par1 & 4294967295L | ((long)par2 & 4294967295L) << 32;
BiomeCacheBlock var5 = (BiomeCacheBlock)this.cacheMap.getValueByKey(var3);
if (var5 == null)
{
var5 = new BiomeCacheBlock(this, par1, par2);
this.cacheMap.add(var3, var5);
this.cache.add(var5);
}
var5.lastAccessTime = System.currentTimeMillis();
return var5;
}
/**
* Returns the BiomeGenBase related to the x, z position from the cache.
*/
public BiomeGenBase getBiomeGenAt(int par1, int par2)
{
return this.getBiomeCacheBlock(par1, par2).getBiomeGenAt(par1, par2);
}
/**
* Removes BiomeCacheBlocks from this cache that haven't been accessed in at least 30 seconds.
*/
public void cleanupCache()
{
long var1 = System.currentTimeMillis();
long var3 = var1 - this.lastCleanupTime;
if (var3 > 7500L || var3 < 0L)
{
this.lastCleanupTime = var1;
for (int var5 = 0; var5 < this.cache.size(); ++var5)
{
BiomeCacheBlock var6 = (BiomeCacheBlock)this.cache.get(var5);
long var7 = var1 - var6.lastAccessTime;
if (var7 > 30000L || var7 < 0L)
{
this.cache.remove(var5--);
long var9 = (long)var6.xPosition & 4294967295L | ((long)var6.zPosition & 4294967295L) << 32;
this.cacheMap.remove(var9);
}
}
}
}
/**
* Returns the array of cached biome types in the BiomeCacheBlock at the given location.
*/
public BiomeGenBase[] getCachedBiomes(int par1, int par2)
{
return this.getBiomeCacheBlock(par1, par2).biomes;
}
/**
* Get the world chunk manager object for a biome list.
*/
static WorldChunkManager getChunkManager(BiomeCache par0BiomeCache)
{
return par0BiomeCache.chunkManager;
}
}