73 lines
2.3 KiB
Java
73 lines
2.3 KiB
Java
/*
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* Copyright 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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package org.webrtc;
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/**
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* Represents a predicate (boolean-valued function) of one argument.
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*/
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public interface Predicate<T> {
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/**
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* Evaluates this predicate on the given argument.
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*
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* @param arg the input argument
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* @return true if the input argument matches the predicate, otherwise false
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*/
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boolean test(T arg);
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/**
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* Returns a composed predicate that represents a short-circuiting logical OR of this predicate
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* and another. When evaluating the composed predicate, if this predicate is true, then the other
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* predicate is not evaluated.
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*
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* @param other a predicate that will be logically-ORed with this predicate
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* @return a composed predicate that represents the short-circuiting logical OR of this predicate
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* and the other predicate
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*/
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default Predicate<T> or(Predicate<? super T> other) {
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return new Predicate<T>() {
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@Override
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public boolean test(T arg) {
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return Predicate.this.test(arg) || other.test(arg);
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}
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};
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}
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/**
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* Returns a composed predicate that represents a short-circuiting logical AND of this predicate
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* and another.
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*
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* @param other a predicate that will be logically-ANDed with this predicate
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* @return a composed predicate that represents the short-circuiting logical AND of this predicate
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* and the other predicate
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*/
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default Predicate<T> and(Predicate<? super T> other) {
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return new Predicate<T>() {
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@Override
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public boolean test(T arg) {
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return Predicate.this.test(arg) && other.test(arg);
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}
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};
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}
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/**
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* Returns a predicate that represents the logical negation of this predicate.
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*
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* @return a predicate that represents the logical negation of this predicate
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*/
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default Predicate<T> negate() {
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return new Predicate<T>() {
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@Override
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public boolean test(T arg) {
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return !Predicate.this.test(arg);
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}
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};
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}
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} |