1 /* 2 * Copyright (C) 2017 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 /** 19 * Lookup that always returns null. 20 * @param <K> input type (the "key") which implements {@link Lookup}. 21 * @param <V> output type (the "value") which implements {@link Lookup}. 22 */ 23 public final class StubLookup<K, V> implements Lookup<K, V> { 24 @Override lookup(K key)25 public V lookup(K key) { 26 return null; 27 } 28 } 29