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/*
 * 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);
  }
}




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