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 package com.android.documentsui.base; 17 18 import java.util.function.Function; 19 20 import javax.annotation.Nullable; 21 22 /** 23 * A {@link Function}-like interface for looking up information. 24 * 25 * @param K input type (the "key"). 26 * @param V output type (the "value"). 27 */ 28 @FunctionalInterface 29 public interface Lookup<K, V> { lookup(K key)30 @Nullable V lookup(K key); 31 } 32