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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.android.systemui.util.leak;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Like WeakHashMap, but uses identity instead of equality when comparing keys.
*/
public class WeakIdentityHashMap<K,V> {
private final HashMap<WeakReference<K>,V> mMap = new HashMap<>();
private final ReferenceQueue<Object> mRefQueue = new ReferenceQueue<>();
private void cleanUp() {
Reference<?> ref;
while ((ref = mRefQueue.poll()) != null) {
mMap.remove(ref);
}
}
public void put(K key, V value) {
cleanUp();
mMap.put(new CmpWeakReference<>(key, mRefQueue), value);
}
public V get(K key) {
cleanUp();
return mMap.get(new CmpWeakReference<>(key));
}
public Collection<V> values() {
cleanUp();
return mMap.values();
}
public Set<Map.Entry<WeakReference<K>, V>> entrySet() {
return mMap.entrySet();
}
public int size() {
cleanUp();
return mMap.size();
}
public boolean isEmpty() {
cleanUp();
return mMap.isEmpty();
}
private static class CmpWeakReference<K> extends WeakReference<K> {
private final int mHashCode;
public CmpWeakReference(K key) {
super(key);
mHashCode = System.identityHashCode(key);
}
public CmpWeakReference(K key, ReferenceQueue<Object> refQueue) {
super(key, refQueue);
mHashCode = System.identityHashCode(key);
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
K k = get();
if (k != null && o instanceof CmpWeakReference) {
return ((CmpWeakReference) o).get() == k;
}
return false;
}
@Override
public int hashCode() {
return mHashCode;
}
}
}
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