75 lines
2.4 KiB
Java
75 lines
2.4 KiB
Java
/*
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*
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* MIT License
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*
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* Copyright (c) 2020 TerraForged
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.terraforged.util;
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import com.terraforged.n2d.util.NoiseUtil;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class ListUtils {
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public static <T> T get(List<T> list, float value, T def) {
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if (list.isEmpty()) {
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return def;
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}
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return get(list, list.size() - 1, value, def);
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}
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public static <T> T get(List<T> list, int maxIndex, float value, T def) {
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int index = NoiseUtil.round(value * maxIndex);
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if (index < list.size()) {
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return list.get(index);
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}
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return def;
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}
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public static <T> List<T> minimize(List<T> list) {
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Map<T, Integer> counts = count(list);
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List<T> result = new ArrayList<>(list.size());
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int min = counts.values().stream().min(Integer::compareTo).orElse(1);
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for (T t : list) {
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int count = counts.get(t);
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int amount = count / min;
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for (int i = 0; i < amount; i++) {
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result.add(t);
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}
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}
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return result;
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}
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public static <T> Map<T, Integer> count(List<T> list) {
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Map<T, Integer> map = new HashMap<>(list.size());
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for (T t : list) {
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int count = map.getOrDefault(t, 0);
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map.put(t, ++count);
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}
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return map;
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}
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}
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