android/arch/core/util/Function.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.arch.core.util;

/**
 * Represents a function.
 *
 * @param <I> the type of the input to the function
 * @param <O> the type of the output of the function
 */
public interface Function<I, O> {
    /**
     * Applies this function to the given input.
     *
     * @param input the input
     * @return the function result.
     */
    O apply(I input);
}