| /* |
| * Copyright 2000-2013 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.reference.SoftReference; |
| import gnu.trove.TIntObjectHashMap; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| public class WeakValueIntObjectHashMap<V> { |
| private final TIntObjectHashMap<MyReference<V>> myMap = new TIntObjectHashMap<MyReference<V>>(); |
| private final ReferenceQueue<V> myQueue = new ReferenceQueue<V>(); |
| |
| private static class MyReference<T> extends WeakReference<T> { |
| private final int key; |
| String name; |
| |
| private MyReference(int key, T referent, ReferenceQueue<? super T> q) { |
| super(referent, q); |
| this.key = key; |
| } |
| } |
| |
| private void processQueue() { |
| while(true){ |
| MyReference ref = (MyReference)myQueue.poll(); |
| if (ref == null) { |
| return; |
| } |
| int key = ref.key; |
| myMap.remove(key); |
| keyExpired(key); |
| } |
| } |
| |
| protected void keyExpired(int key) { |
| |
| } |
| |
| public final V get(int key) { |
| MyReference<V> ref = myMap.get(key); |
| return SoftReference.dereference(ref); |
| } |
| |
| public final V put(int key, @NotNull V value) { |
| processQueue(); |
| MyReference<V> ref = new MyReference<V>(key, value, myQueue); |
| ref.name = value.toString(); |
| MyReference<V> oldRef = myMap.put(key, ref); |
| return SoftReference.dereference(oldRef); |
| } |
| |
| public final V remove(int key) { |
| processQueue(); |
| MyReference<V> ref = myMap.remove(key); |
| return SoftReference.dereference(ref); |
| } |
| |
| public final void clear() { |
| myMap.clear(); |
| processQueue(); |
| } |
| |
| public final int size() { |
| return myMap.size(); |
| } |
| |
| public final boolean isEmpty() { |
| return myMap.isEmpty(); |
| } |
| |
| public final boolean containsKey(int key) { |
| return get(key) != null; |
| } |
| |
| @NotNull |
| public final Collection<V> values() { |
| List<V> result = new ArrayList<V>(); |
| Object[] refs = myMap.getValues(); |
| for (Object o : refs) { |
| @SuppressWarnings("unchecked") |
| final V value = ((MyReference<V>)o).get(); |
| if (value != null) { |
| result.add(value); |
| } |
| } |
| return result; |
| } |
| } |