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.selection.demo; 17 18 import static android.support.v4.util.Preconditions.checkArgument; 19 20 import com.android.documentsui.selection.SelectionHelper.StableIdProvider; 21 22 import java.util.List; 23 24 /** 25 * Provides RecyclerView selection code access to stable ids backed 26 * by DocumentsAdapter. 27 */ 28 final class DemoStableIdProvider extends StableIdProvider { 29 30 private final SelectionDemoAdapter mAdapter; 31 DemoStableIdProvider(SelectionDemoAdapter adapter)32 public DemoStableIdProvider(SelectionDemoAdapter adapter) { 33 checkArgument(adapter != null); 34 mAdapter = adapter; 35 } 36 37 @Override getStableId(int position)38 public String getStableId(int position) { 39 return mAdapter.getStableId(position); 40 } 41 42 @Override getPosition(String id)43 public int getPosition(String id) { 44 return mAdapter.getPosition(id); 45 } 46 47 @Override getStableIds()48 public List<String> getStableIds() { 49 return mAdapter.getStableIds(); 50 } 51 } 52