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/*
* 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;
}
}
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