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/*
* Copyright 2000-2014 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 org.jetbrains.annotations.NotNull;
import java.lang.ref.WeakReference;
import java.util.*;
import java.util.HashSet;
/**
* @author peter
*/
public class WeakStringInterner extends StringInterner {
private final WeakHashMap<String, WeakReference<String>> myMap = new WeakHashMap<String, WeakReference<String>>();
@NotNull
@Override
public String intern(@NotNull String name) {
String interned = SoftReference.dereference(myMap.get(name));
if (interned != null) {
return interned;
}
myMap.put(name, new WeakReference<String>(name));
return name;
}
@Override
public void clear() {
myMap.clear();
}
@NotNull
@Override
public Set<String> getValues() {
HashSet<String> result = ContainerUtil.newHashSet();
for (WeakReference<String> value : myMap.values()) {
ContainerUtil.addIfNotNull(result, value.get());
}
return result;
}
}
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