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 17 package com.android.documentsui.testing; 18 19 import android.app.LoaderManager; 20 import android.content.AsyncTaskLoader; 21 import android.content.Loader; 22 import android.content.Loader.OnLoadCompleteListener; 23 import android.os.Bundle; 24 import android.util.SparseArray; 25 26 import java.io.FileDescriptor; 27 import java.io.PrintWriter; 28 29 /** 30 * A test double of {@link LoaderManager} that doesn't kick off loading when {@link Loader} is 31 * created. If caller needs to kick off loading caller can obtain the loader initialized and 32 * explicitly call {@link Loader#startLoading()}. 33 */ 34 public class TestLoaderManager extends LoaderManager { 35 36 private final SparseArray<Loader> mLoaders = new SparseArray<>(); 37 private final SparseArray<OnLoadCompleteListener> mListeners = new SparseArray<>(); 38 39 @Override initLoader(int id, Bundle args, LoaderCallbacks<D> callback)40 public <D> Loader<D> initLoader(int id, Bundle args, 41 LoaderCallbacks<D> callback) { 42 Loader<D> loader = mLoaders.get(id); 43 OnLoadCompleteListener<D> listener = callback::onLoadFinished; 44 if (loader == null) { 45 loader = callback.onCreateLoader(id, args); 46 mLoaders.put(id, loader); 47 } else { 48 loader.unregisterListener(mListeners.get(id)); 49 } 50 51 loader.registerListener(id, listener); 52 mListeners.put(id, listener); 53 54 return loader; 55 } 56 57 @Override restartLoader(int id, Bundle args, LoaderCallbacks<D> callback)58 public <D> Loader<D> restartLoader(int id, Bundle args, 59 LoaderCallbacks<D> callback) { 60 if (mLoaders.get(id) != null) { 61 destroyLoader(id); 62 } 63 64 return initLoader(id, args, callback); 65 } 66 67 @Override destroyLoader(int id)68 public void destroyLoader(int id) { 69 Loader loader = getLoader(id); 70 if (loader != null) { 71 loader.abandon(); 72 mLoaders.remove(id); 73 mListeners.remove(id); 74 } 75 } 76 77 @Override getLoader(int id)78 public <D> Loader<D> getLoader(int id) { 79 return mLoaders.get(id); 80 } 81 getListener(int id)82 public <D> OnLoadCompleteListener<D> getListener(int id) { 83 return mListeners.get(id); 84 } 85 runAsyncTaskLoader(int id)86 public void runAsyncTaskLoader(int id) { 87 AsyncTaskLoader loader = (AsyncTaskLoader) getLoader(id); 88 loader.startLoading(); 89 } 90 91 @Override dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args)92 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 93 94 } 95 } 96