com.google.gwt.emul.java.util.function.Predicate Maven / Gradle / Ivy
/*
* Copyright 2015 Google Inc.
*
* 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 java.util.function;
import java.util.Objects;
import static javaemul.internal.InternalPreconditions.checkCriticalNotNull;
/**
* See
* the official Java API doc for details.
*
* @param type of the argument
*/
@FunctionalInterface
public interface Predicate {
static Predicate isEqual(Object targetRef) {
return targetRef == null ? Objects::isNull : targetRef::equals;
}
boolean test(T t);
default Predicate negate() {
return t -> !test(t);
}
default Predicate and(Predicate other) {
checkCriticalNotNull(other);
return t -> test(t) && other.test(t);
}
default Predicate or(Predicate other) {
checkCriticalNotNull(other);
return t -> test(t) || other.test(t);
}
@SuppressWarnings("unchecked")
static Predicate not(Predicate other) {
return (Predicate) other.negate();
}
}