001/*
002 * PlotSquared, a land and world management plugin for Minecraft.
003 * Copyright (C) IntellectualSites <https://intellectualsites.com>
004 * Copyright (C) IntellectualSites team and contributors
005 *
006 * This program is free software: you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation, either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * This program is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
018 */
019package com.plotsquared.core.collection;
020
021import java.util.Map;
022import java.util.NavigableMap;
023import java.util.Random;
024import java.util.TreeMap;
025
026public class SimpleRandomCollection<E> extends RandomCollection<E> {
027
028    private final NavigableMap<Double, E> map = new TreeMap<>();
029    private double total = 0;
030
031    public SimpleRandomCollection(Map<E, Double> weights, Random random) {
032        super(weights, random);
033        for (Map.Entry<E, Double> entry : weights.entrySet()) {
034            add(entry.getValue(), entry.getKey());
035        }
036    }
037
038    public void add(double weight, E result) {
039        if (weight <= 0) {
040            return;
041        }
042        total += weight;
043        map.put(total, result);
044    }
045
046    public E next() {
047        return map.ceilingEntry(random.nextDouble()).getValue();
048    }
049
050}