    001    package net.minecraft.util;
    002
    003    import cpw.mods.fml.relauncher.Side;
    004    import cpw.mods.fml.relauncher.SideOnly;
    005    import java.util.ArrayList;
    006    import java.util.List;
    007
    008    public class Vec3Pool
    009    {
    010        private final int truncateArrayResetThreshold;
    011        private final int minimumSize;
    012
    013        /** items at and above nextFreeSpace are assumed to be available */
    014        private final List vec3Cache = new ArrayList();
    015        private int nextFreeSpace = 0;
    016        private int maximumSizeSinceLastTruncation = 0;
    017        private int resetCount = 0;
    018
    019        public Vec3Pool(int par1, int par2)
    020        {
    021            this.truncateArrayResetThreshold = par1;
    022            this.minimumSize = par2;
    023        }
    024
    025        /**
    026         * extends the pool if all vecs are currently "out"
    027         */
    028        public Vec3 getVecFromPool(double par1, double par3, double par5)
    029        {
    030            if (this.func_82589_e())
    031            {
    032                return new Vec3(this, par1, par3, par5);
    033            }
    034            else
    035            {
    036                Vec3 var7;
    037
    038                if (this.nextFreeSpace >= this.vec3Cache.size())
    039                {
    040                    var7 = new Vec3(this, par1, par3, par5);
    041                    this.vec3Cache.add(var7);
    042                }
    043                else
    044                {
    045                    var7 = (Vec3)this.vec3Cache.get(this.nextFreeSpace);
    046                    var7.setComponents(par1, par3, par5);
    047                }
    048
    049                ++this.nextFreeSpace;
    050                return var7;
    051            }
    052        }
    053
    054        /**
    055         * Will truncate the array everyN clears to the maximum size observed since the last truncation.
    056         */
    057        public void clear()
    058        {
    059            if (!this.func_82589_e())
    060            {
    061                if (this.nextFreeSpace > this.maximumSizeSinceLastTruncation)
    062                {
    063                    this.maximumSizeSinceLastTruncation = this.nextFreeSpace;
    064                }
    065
    066                if (this.resetCount++ == this.truncateArrayResetThreshold)
    067                {
    068                    int var1 = Math.max(this.maximumSizeSinceLastTruncation, this.vec3Cache.size() - this.minimumSize);
    069
    070                    while (this.vec3Cache.size() > var1)
    071                    {
    072                        this.vec3Cache.remove(var1);
    073                    }
    074
    075                    this.maximumSizeSinceLastTruncation = 0;
    076                    this.resetCount = 0;
    077                }
    078
    079                this.nextFreeSpace = 0;
    080            }
    081        }
    082
    083        @SideOnly(Side.CLIENT)
    084        public void clearAndFreeCache()
    085        {
    086            if (!this.func_82589_e())
    087            {
    088                this.nextFreeSpace = 0;
    089                this.vec3Cache.clear();
    090            }
    091        }
    092
    093        public int getPoolSize()
    094        {
    095            return this.vec3Cache.size();
    096        }
    097
    098        public int func_82590_d()
    099        {
    100            return this.nextFreeSpace;
    101        }
    102
    103        private boolean func_82589_e()
    104        {
    105            return this.minimumSize < 0 || this.truncateArrayResetThreshold < 0;
    106        }
    107    }