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