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