ContentProviderClient.java revision 2ec6c5699181316e5a5c2cd293c006ac4a8bb101
1/* 2 * Copyright (C) 2009 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 android.content; 18 19import android.database.Cursor; 20import android.net.Uri; 21import android.os.RemoteException; 22import android.os.ParcelFileDescriptor; 23import android.content.res.AssetFileDescriptor; 24 25import java.io.FileNotFoundException; 26import java.util.ArrayList; 27 28/** 29 * The public interface object used to interact with a {@link ContentProvider}. This is obtained by 30 * calling {@link ContentResolver#acquireContentProviderClient}. This object must be released 31 * using {@link #release} in order to indicate to the system that the {@link ContentProvider} is 32 * no longer needed and can be killed to free up resources. 33 */ 34public class ContentProviderClient { 35 private final IContentProvider mContentProvider; 36 private final ContentResolver mContentResolver; 37 38 /** 39 * @hide 40 */ 41 ContentProviderClient(ContentResolver contentResolver, IContentProvider contentProvider) { 42 mContentProvider = contentProvider; 43 mContentResolver = contentResolver; 44 } 45 46 /** see {@link ContentProvider#query} */ 47 public Cursor query(Uri url, String[] projection, String selection, 48 String[] selectionArgs, String sortOrder) throws RemoteException { 49 return mContentProvider.query(url, projection, selection, selectionArgs, sortOrder); 50 } 51 52 /** see {@link ContentProvider#getType} */ 53 public String getType(Uri url) throws RemoteException { 54 return mContentProvider.getType(url); 55 } 56 57 /** see {@link ContentProvider#insert} */ 58 public Uri insert(Uri url, ContentValues initialValues) 59 throws RemoteException { 60 return mContentProvider.insert(url, initialValues); 61 } 62 63 /** see {@link ContentProvider#bulkInsert} */ 64 public int bulkInsert(Uri url, ContentValues[] initialValues) throws RemoteException { 65 return mContentProvider.bulkInsert(url, initialValues); 66 } 67 68 /** see {@link ContentProvider#delete} */ 69 public int delete(Uri url, String selection, String[] selectionArgs) 70 throws RemoteException { 71 return mContentProvider.delete(url, selection, selectionArgs); 72 } 73 74 /** see {@link ContentProvider#update} */ 75 public int update(Uri url, ContentValues values, String selection, 76 String[] selectionArgs) throws RemoteException { 77 return mContentProvider.update(url, values, selection, selectionArgs); 78 } 79 80 /** see {@link ContentProvider#openFile} */ 81 public ParcelFileDescriptor openFile(Uri url, String mode) 82 throws RemoteException, FileNotFoundException { 83 return mContentProvider.openFile(url, mode); 84 } 85 86 /** see {@link ContentProvider#openAssetFile} */ 87 public AssetFileDescriptor openAssetFile(Uri url, String mode) 88 throws RemoteException, FileNotFoundException { 89 return mContentProvider.openAssetFile(url, mode); 90 } 91 92 /** see {@link ContentProvider#applyBatch} */ 93 public ContentProviderResult[] applyBatch(ArrayList<ContentProviderOperation> operations) 94 throws RemoteException, OperationApplicationException { 95 return mContentProvider.applyBatch(operations); 96 } 97 98 /** 99 * Call this to indicate to the system that the associated {@link ContentProvider} is no 100 * longer needed by this {@link ContentProviderClient}. 101 * @return true if this was release, false if it was already released 102 */ 103 public boolean release() { 104 return mContentResolver.releaseProvider(mContentProvider); 105 } 106 107 /** 108 * Get a reference to the {@link ContentProvider} that is associated with this 109 * client. If the {@link ContentProvider} is running in a different process then 110 * null will be returned. This can be used if you know you are running in the same 111 * process as a provider, and want to get direct access to its implementation details. 112 * 113 * @return If the associated {@link ContentProvider} is local, returns it. 114 * Otherwise returns null. 115 */ 116 public ContentProvider getLocalContentProvider() { 117 return ContentProvider.coerceToLocalContentProvider(mContentProvider); 118 } 119} 120