/*
* 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.hash;
public interface EqualityPolicy<T> {
EqualityPolicy<?> IDENTITY = new EqualityPolicy() {
@Override
public int getHashCode(Object value) {
return System.identityHashCode(value);
}
@Override
public boolean isEqual(Object val1, Object val2) {
return val1 == val2;
}
};
EqualityPolicy<?> CANONICAL = new EqualityPolicy() {
@Override
public int getHashCode(Object value) {
return value != null ? value.hashCode() : 0;
}
@Override
public boolean isEqual(Object val1, Object val2) {
return val1 != null ? val1.equals(val2) : val2 == null;
}
};
int getHashCode(T value);
boolean isEqual(T val1, T val2);
}