1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License
15  */
16 
17 package com.android.internal.util;
18 
19 import java.util.function.Function;
20 
21 /**
22  * Represents a function that produces an boolean-valued result.  This is the
23  * {@code boolean}-producing primitive specialization for {@link Function}.
24  *
25  * <p>This is a <a href="package-summary.html">functional interface</a>
26  * whose functional method is {@link #apply(Object)}.
27  *
28  * @param <T> the type of the input to the function
29  *
30  * @see Function
31  * @since 1.8
32  */
33 @FunctionalInterface
34 public interface ToBooleanFunction<T> {
35 
36     /**
37      * Applies this function to the given argument.
38      *
39      * @param value the function argument
40      * @return the function result
41      */
apply(T value)42     boolean apply(T value);
43 }
44