mirror of https://github.com/PaperMC/Paper.git
113 lines
3.6 KiB
Java
113 lines
3.6 KiB
Java
/*
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* This file is licensed under the MIT License (MIT).
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*
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* Copyright (c) 2014 Daniel Ennis <http://aikar.co>
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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
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* all 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
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* THE SOFTWARE.
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*/
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package co.aikar.util;
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import java.util.AbstractMap;
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import java.util.Collection;
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import java.util.Map;
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import java.util.Set;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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/**
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* Implements a Most Recently Used cache in front of a backing map, to quickly access the last accessed result.
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*
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* @param <K> Key Type of the Map
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* @param <V> Value Type of the Map
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*/
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@Deprecated(forRemoval = true)
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public class MRUMapCache<K, V> extends AbstractMap<K, V> {
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final Map<K, V> backingMap;
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Object cacheKey;
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V cacheValue;
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public MRUMapCache(@NotNull final Map<K, V> backingMap) {
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this.backingMap = backingMap;
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}
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public int size() {return backingMap.size();}
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public boolean isEmpty() {return backingMap.isEmpty();}
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public boolean containsKey(@Nullable Object key) {
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return key != null && key.equals(cacheKey) || backingMap.containsKey(key);
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}
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public boolean containsValue(@Nullable Object value) {
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return value != null && value == cacheValue || backingMap.containsValue(value);
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}
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@Nullable
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public V get(@Nullable Object key) {
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if (cacheKey != null && cacheKey.equals(key)) {
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return cacheValue;
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}
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cacheKey = key;
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return cacheValue = backingMap.get(key);
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}
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@Nullable
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public V put(@Nullable K key, @Nullable V value) {
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cacheKey = key;
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return cacheValue = backingMap.put(key, value);
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}
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@Nullable
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public V remove(@Nullable Object key) {
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if (key != null && key.equals(cacheKey)) {
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cacheKey = null;
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}
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return backingMap.remove(key);
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}
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public void putAll(@NotNull Map<? extends K, ? extends V> m) {backingMap.putAll(m);}
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public void clear() {
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cacheKey = null;
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cacheValue = null;
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backingMap.clear();
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}
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@NotNull
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public Set<K> keySet() {return backingMap.keySet();}
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@NotNull
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public Collection<V> values() {return backingMap.values();}
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@NotNull
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public Set<Map.Entry<K, V>> entrySet() {return backingMap.entrySet();}
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/**
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* Wraps the specified map with a most recently used cache
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*
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* @param map Map to be wrapped
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* @param <K> Key Type of the Map
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* @param <V> Value Type of the Map
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* @return Map
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*/
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@NotNull
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public static <K, V> Map<K, V> of(@NotNull Map<K, V> map) {
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return new MRUMapCache<K, V>(map);
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}
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}
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