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/*
 *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package org.webrtc;

/**
 * Represents a predicate (boolean-valued function) of one argument.
 */
public interface Predicate {
  /**
   * Evaluates this predicate on the given argument.
   *
   * @param arg the input argument
   * @return true if the input argument matches the predicate, otherwise false
   */
  boolean test(T arg);

  /**
   * Returns a composed predicate that represents a short-circuiting logical OR of this predicate
   * and another. When evaluating the composed predicate, if this predicate is true, then the other
   * predicate is not evaluated.
   *
   * @param other a predicate that will be logically-ORed with this predicate
   * @return a composed predicate that represents the short-circuiting logical OR of this predicate
   *     and the other predicate
   */
  default Predicate or(Predicate other) {
    return new Predicate() {
      @Override
      public boolean test(T arg) {
        return Predicate.this.test(arg) || other.test(arg);
      }
    };
  }

  /**
   * Returns a composed predicate that represents a short-circuiting logical AND of this predicate
   * and another.
   *
   * @param other a predicate that will be logically-ANDed with this predicate
   * @return a composed predicate that represents the short-circuiting logical AND of this predicate
   *     and the other predicate
   */
  default Predicate and(Predicate other) {
    return new Predicate() {
      @Override
      public boolean test(T arg) {
        return Predicate.this.test(arg) && other.test(arg);
      }
    };
  }

  /**
   * Returns a predicate that represents the logical negation of this predicate.
   *
   * @return a predicate that represents the logical negation of this predicate
   */
  default Predicate negate() {
    return new Predicate() {
      @Override
      public boolean test(T arg) {
        return !Predicate.this.test(arg);
      }
    };
  }
}