1/* 2 * Copyright 2018 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 17package androidx.paging; 18 19import androidx.annotation.NonNull; 20import androidx.annotation.Nullable; 21 22class SnapshotPagedList<T> extends PagedList<T> { 23 private final boolean mContiguous; 24 private final Object mLastKey; 25 private final DataSource<?, T> mDataSource; 26 27 SnapshotPagedList(@NonNull PagedList<T> pagedList) { 28 super(pagedList.mStorage.snapshot(), 29 pagedList.mMainThreadExecutor, 30 pagedList.mBackgroundThreadExecutor, 31 null, 32 pagedList.mConfig); 33 mDataSource = pagedList.getDataSource(); 34 mContiguous = pagedList.isContiguous(); 35 mLastKey = pagedList.getLastKey(); 36 } 37 38 @Override 39 public boolean isImmutable() { 40 return true; 41 } 42 43 @Override 44 public boolean isDetached() { 45 return true; 46 } 47 48 @Override 49 boolean isContiguous() { 50 return mContiguous; 51 } 52 53 @Nullable 54 @Override 55 public Object getLastKey() { 56 return mLastKey; 57 } 58 59 @NonNull 60 @Override 61 public DataSource<?, T> getDataSource() { 62 return mDataSource; 63 } 64 65 @Override 66 void dispatchUpdatesSinceSnapshot(@NonNull PagedList<T> storageSnapshot, 67 @NonNull Callback callback) { 68 } 69 70 @Override 71 void loadAroundInternal(int index) { 72 } 73} 74