/*
* 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 org.jetbrains.annotations.NotNull;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.util.*;
public final class SoftKeySoftValueHashMap<K,V> implements Map<K,V>{
private final SoftHashMap<K, MyValueReference<K,V>> mySoftKeyMap = new SoftHashMap<K, MyValueReference<K, V>>();
private final ReferenceQueue<V> myQueue = new ReferenceQueue<V>();
private static class MyValueReference<K,V> extends SoftReference<V> {
private final SoftHashMap.Key<K> key;
private MyValueReference(SoftHashMap.Key<K> key, V referent, ReferenceQueue<? super V> q) {
super(referent, q);
this.key = key;
}
}
// returns true if some refs were tossed
boolean processQueue() {
boolean processed = mySoftKeyMap.processQueue();
while(true) {
MyValueReference<K,V> ref = (MyValueReference<K, V>)myQueue.poll();
if (ref == null) break;
SoftHashMap.Key<K> key = ref.key;
mySoftKeyMap.removeKey(key);
processed = true;
}
return processed;
}
@Override
public V get(Object key) {
MyValueReference<K,V> ref = mySoftKeyMap.get(key);
if (ref == null) return null;
return ref.get();
}
@Override
public V put(K key, V value) {
processQueue();
SoftHashMap.Key<K> softKey = mySoftKeyMap.createKey(key);
MyValueReference<K, V> reference = new MyValueReference<K, V>(softKey, value, myQueue);
MyValueReference<K,V> oldRef = mySoftKeyMap.putKey(softKey, reference);
return oldRef == null ? null : oldRef.get();
}
@Override
public V remove(Object key) {
processQueue();
MyValueReference<K,V> ref = mySoftKeyMap.remove(key);
return ref != null ? ref.get() : null;
}
@Override
public void putAll(Map<? extends K, ? extends V> t) {
throw new RuntimeException("method not implemented");
}
@Override
public void clear() {
mySoftKeyMap.clear();
processQueue();
}
@Override
public int size() {
return mySoftKeyMap.size(); //?
}
@Override
public boolean isEmpty() {
return mySoftKeyMap.isEmpty(); //?
}
@Override
public boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public boolean containsValue(Object value) {
throw new RuntimeException("method not implemented");
}
@NotNull
@Override
public Set<K> keySet() {
return mySoftKeyMap.keySet();
}
@NotNull
@Override
public Collection<V> values() {
List<V> result = new ArrayList<V>();
final Collection<MyValueReference<K, V>> refs = mySoftKeyMap.values();
for (MyValueReference<K, V> ref : refs) {
final V value = ref.get();
if (value != null) {
result.add(value);
}
}
return result;
}
@NotNull
@Override
public Set<Entry<K, V>> entrySet() {
throw new RuntimeException("method not implemented");
}
}