73 lines
2.3 KiB
Java
73 lines
2.3 KiB
Java
|
/*
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}
|