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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<T> {
/**
* 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<T> or(Predicate<? super T> other) {
return new Predicate<T>() {
@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<T> and(Predicate<? super T> other) {
return new Predicate<T>() {
@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<T> negate() {
return new Predicate<T>() {
@Override
public boolean test(T arg) {
return !Predicate.this.test(arg);
}
};
}
}
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