/*
* Copyright 2003-2016 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.nodeEditor.menus;
import org.jetbrains.annotations.NotNull;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Predicate;
/**
* @author simon
*/
public class CachingPredicate<T> implements Predicate<T> {
private final Map<T, Boolean> myResults = new HashMap<>();
private final Predicate<T> myPredicate;
public CachingPredicate(@NotNull Predicate<T> predicate) {
myPredicate = predicate;
}
@Override
public boolean test(T t) {
Boolean result = myResults.get(t);
if (result != null) {
return result;
}
result = myPredicate.test(t);
myResults.put(t, result);
return result;
}
}