ToBooleanFunction.java revision f4ebe2e2ccfcbce9de7ad0c3b5399971201f66fd 
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
17package com.android.internal.util;
18
19import 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
34public 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     */
42    boolean apply(T value);
43}
44