| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.contacts.list; |
| |
| import android.content.Context; |
| import android.content.CursorLoader; |
| import android.database.Cursor; |
| import android.database.CursorWrapper; |
| import android.net.Uri; |
| |
| /** |
| * A specialized loader for the Join Contacts UI. It executes two queries: |
| * join suggestions and (optionally) the full contact list. |
| * |
| * This loader also loads the "suggestion" cursor, which can be accessed with: |
| * {@code ((JoinContactLoaderResult) result).suggestionCursor } |
| */ |
| public class JoinContactLoader extends CursorLoader { |
| |
| private String[] mProjection; |
| private Uri mSuggestionUri; |
| |
| /** |
| * Actual returned class. It's guaranteed that this loader always returns an instance of this |
| * class. This class is needed to tie the lifecycle of the second cursor to that of the |
| * primary one. |
| * |
| * Note we can't change the result type of this loader itself, because CursorLoader |
| * extends AsyncTaskLoader<Cursor>, not AsyncTaskLoader<? extends Cursor> |
| */ |
| public static class JoinContactLoaderResult extends CursorWrapper { |
| public final Cursor suggestionCursor; |
| |
| public JoinContactLoaderResult(Cursor baseCursor, Cursor suggestionCursor) { |
| super(baseCursor); |
| this.suggestionCursor = suggestionCursor; |
| } |
| |
| @Override |
| public void close() { |
| try { |
| if (suggestionCursor != null) { |
| suggestionCursor.close(); |
| } |
| } finally { |
| if (super.getWrappedCursor() != null) { |
| super.close(); |
| } |
| } |
| } |
| } |
| |
| public JoinContactLoader(Context context) { |
| super(context, null, null, null, null, null); |
| } |
| |
| public void setSuggestionUri(Uri uri) { |
| this.mSuggestionUri = uri; |
| } |
| |
| @Override |
| public void setProjection(String[] projection) { |
| super.setProjection(projection); |
| this.mProjection = projection; |
| } |
| |
| @Override |
| public Cursor loadInBackground() { |
| // First execute the suggestions query, then call super.loadInBackground |
| // to load the entire list |
| final Cursor suggestionsCursor = getContext().getContentResolver() |
| .query(mSuggestionUri, mProjection, null, null, null); |
| if (suggestionsCursor == null) { |
| return null; |
| } |
| Cursor cursorToClose = suggestionsCursor; |
| try { |
| final Cursor baseCursor = super.loadInBackground(); |
| if (baseCursor != null) { |
| final JoinContactLoaderResult result = |
| new JoinContactLoaderResult(baseCursor, suggestionsCursor); |
| cursorToClose = null; |
| return result; |
| } |
| } finally { |
| if (cursorToClose != null) { |
| cursorToClose.close(); |
| } |
| } |
| return null; |
| } |
| } |