/*
* Copyright 2003-2011 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 jetbrains.mps.cache;
import org.jetbrains.annotations.NotNull;
/**
* Igor Alshannikov
* Aug 28, 2007
*/
public class KeyProducer {
public KeyProducer() {
}
public Object createKey(@NotNull Object innerKey) {
return new Key(hashCode(), innerKey);
}
private static class Key {
private int myProducerHashCode;
private Object myInnerKey;
private Key(int producerHashCode, Object innerKey) {
myProducerHashCode = producerHashCode;
myInnerKey = innerKey;
}
public boolean equals(Object o) {
if (this == o) return true;
if (false == o instanceof Key) return false;
Key key = (Key) o;
return myProducerHashCode == key.myProducerHashCode &&
myInnerKey.equals(key.myInnerKey);
}
public int hashCode() {
return 31 * myProducerHashCode + myInnerKey.hashCode();
}
public String toString() {
return myProducerHashCode + "/" + myInnerKey.toString();
}
}
}