WeightedRandom.java

package net.minecraft.util;

import java.util.Collection;
import java.util.Iterator;
import java.util.Random;

public class WeightedRandom
{
    private static final String __OBFID = "CL_00001503";

    /**
     * Returns the total weight of all items in a collection.
     */
    public static int getTotalWeight(Collection p_76272_0_)
    {
        int var1 = 0;
        WeightedRandom.Item var3;

        for (Iterator var2 = p_76272_0_.iterator(); var2.hasNext(); var1 += var3.itemWeight)
        {
            var3 = (WeightedRandom.Item)var2.next();
        }

        return var1;
    }

    /**
     * Returns a random choice from the input items, with a total weight value.
     */
    public static WeightedRandom.Item getRandomItem(Random p_76273_0_, Collection p_76273_1_, int p_76273_2_)
    {
        if (p_76273_2_ <= 0)
        {
            throw new IllegalArgumentException();
        }
        else
        {
            int var3 = p_76273_0_.nextInt(p_76273_2_);
            return func_180166_a(p_76273_1_, var3);
        }
    }

    public static WeightedRandom.Item func_180166_a(Collection p_180166_0_, int p_180166_1_)
    {
        Iterator var2 = p_180166_0_.iterator();
        WeightedRandom.Item var3;

        do
        {
            if (!var2.hasNext())
            {
                return null;
            }

            var3 = (WeightedRandom.Item)var2.next();
            p_180166_1_ -= var3.itemWeight;
        }
        while (p_180166_1_ >= 0);

        return var3;
    }

    /**
     * Returns a random choice from the input items.
     */
    public static WeightedRandom.Item getRandomItem(Random p_76271_0_, Collection p_76271_1_)
    {
        return getRandomItem(p_76271_0_, p_76271_1_, getTotalWeight(p_76271_1_));
    }

    public static class Item
    {
        protected int itemWeight;
        private static final String __OBFID = "CL_00001504";

        public Item(int p_i1556_1_)
        {
            this.itemWeight = p_i1556_1_;
        }
    }
}