| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.util.containers; |
| |
| import com.intellij.util.ArrayUtil; |
| import com.intellij.util.ConcurrencyUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentMap; |
| |
| public class ConcurrentMostlySingularMultiMap<K, V> extends MostlySingularMultiMap<K, V> { |
| @NotNull |
| @Override |
| protected Map<K, Object> createMap() { |
| return ContainerUtil.newConcurrentMap(); |
| } |
| |
| @Override |
| public void add(@NotNull K key, @NotNull V value) { |
| ConcurrentMap<K, Object> map = (ConcurrentMap<K, Object>)myMap; |
| while (true) { |
| Object current = map.get(key); |
| if (current == null) { |
| if (ConcurrencyUtil.cacheOrGet(map, key, value) == value) break; |
| } |
| else if (current instanceof Object[]) { |
| Object[] curArr = (Object[])current; |
| Object[] newArr = ArrayUtil.append(curArr, value, ArrayUtil.OBJECT_ARRAY_FACTORY); |
| if (map.replace(key, curArr, newArr)) break; |
| } |
| else { |
| Object[] newArr = {current, value}; |
| if (map.replace(key, current, newArr)) break; |
| } |
| } |
| } |
| |
| @Override |
| public void compact() { |
| // not implemented |
| } |
| |
| public boolean replace(@NotNull K key, @NotNull Collection<V> expectedValue, @NotNull Collection<V> newValue) { |
| ConcurrentMap<K, Object> map = (ConcurrentMap<K, Object>)myMap; |
| Object[] newArray = ArrayUtil.toObjectArray(newValue); |
| Object newValueToPut = newArray.length == 0 ? null : newArray.length == 1 ? newArray[0] : newArray; |
| |
| Object oldValue = map.get(key); |
| List<V> oldCollection = rawValueToCollection(oldValue); |
| if (!oldCollection.equals(expectedValue)) return false; |
| |
| if (oldValue == null) { |
| return newValueToPut == null || map.putIfAbsent(key, newValueToPut) == null; |
| } |
| if (newValueToPut == null) { |
| return map.remove(key, oldValue); |
| } |
| return map.replace(key, oldValue, newValueToPut); |
| } |
| } |