    001package net.minecraft.world.gen.layer;
    002
    003import java.util.ArrayList;
    004import java.util.List;
    005
    006public class IntCache
    007{
    008    private static int intCacheSize = 256;
    009
    010    /**
    011     * A list of pre-allocated int[256] arrays that are currently unused and can be returned by getIntCache()
    012     */
    013    private static List freeSmallArrays = new ArrayList();
    014
    015    /**
    016     * A list of pre-allocated int[256] arrays that were previously returned by getIntCache() and which will not be re-
    017     * used again until resetIntCache() is called.
    018     */
    019    private static List inUseSmallArrays = new ArrayList();
    020
    021    /**
    022     * A list of pre-allocated int[cacheSize] arrays that are currently unused and can be returned by getIntCache()
    023     */
    024    private static List freeLargeArrays = new ArrayList();
    025
    026    /**
    027     * A list of pre-allocated int[cacheSize] arrays that were previously returned by getIntCache() and which will not
    028     * be re-used again until resetIntCache() is called.
    029     */
    030    private static List inUseLargeArrays = new ArrayList();
    031
    032    public static synchronized int[] getIntCache(int par0)
    033    {
    034        int[] var1;
    035
    036        if (par0 <= 256)
    037        {
    038            if (freeSmallArrays.isEmpty())
    039            {
    040                var1 = new int[256];
    041                inUseSmallArrays.add(var1);
    042                return var1;
    043            }
    044            else
    045            {
    046                var1 = (int[])freeSmallArrays.remove(freeSmallArrays.size() - 1);
    047                inUseSmallArrays.add(var1);
    048                return var1;
    049            }
    050        }
    051        else if (par0 > intCacheSize)
    052        {
    053            intCacheSize = par0;
    054            freeLargeArrays.clear();
    055            inUseLargeArrays.clear();
    056            var1 = new int[intCacheSize];
    057            inUseLargeArrays.add(var1);
    058            return var1;
    059        }
    060        else if (freeLargeArrays.isEmpty())
    061        {
    062            var1 = new int[intCacheSize];
    063            inUseLargeArrays.add(var1);
    064            return var1;
    065        }
    066        else
    067        {
    068            var1 = (int[])freeLargeArrays.remove(freeLargeArrays.size() - 1);
    069            inUseLargeArrays.add(var1);
    070            return var1;
    071        }
    072    }
    073
    074    /**
    075     * Mark all pre-allocated arrays as available for re-use by moving them to the appropriate free lists.
    076     */
    077    public static synchronized void resetIntCache()
    078    {
    079        if (!freeLargeArrays.isEmpty())
    080        {
    081            freeLargeArrays.remove(freeLargeArrays.size() - 1);
    082        }
    083
    084        if (!freeSmallArrays.isEmpty())
    085        {
    086            freeSmallArrays.remove(freeSmallArrays.size() - 1);
    087        }
    088
    089        freeLargeArrays.addAll(inUseLargeArrays);
    090        freeSmallArrays.addAll(inUseSmallArrays);
    091        inUseLargeArrays.clear();
    092        inUseSmallArrays.clear();
    093    }
    094
    095    public static synchronized String func_85144_b()
    096    {
    097        return "cache: " + freeLargeArrays.size() + ", tcache: " + freeSmallArrays.size() + ", allocated: " + inUseLargeArrays.size() + ", tallocated: " + inUseSmallArrays.size();
    098    }
    099}