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/*
* Copyright (C) 2015 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.messaging.datamodel;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import com.android.messaging.util.Assert;
import com.google.common.annotations.VisibleForTesting;
/**
* Holds parameters and data (such as content URI) for performing queries on the content provider.
* This class could then be used to perform a query using either a BoundCursorLoader or querying
* on the content resolver directly.
*
* This class is used for cases where the way to load a cursor is not fixed. For example,
* when using ContactUtil to query for phone numbers, the ContactPickerFragment wants to use
* a CursorLoader to asynchronously load the data and tie in nicely with its data binding
* paradigm, whereas ContactRecipientAdapter wants to synchronously perform the query on the
* worker thread.
*/
public class CursorQueryData {
protected final Uri mUri;
protected final String[] mProjection;
protected final String mSelection;
protected final String[] mSelectionArgs;
protected final String mSortOrder;
protected final Context mContext;
public CursorQueryData(final Context context, final Uri uri, final String[] projection,
final String selection, final String[] selectionArgs, final String sortOrder) {
mContext = context;
mUri = uri;
mProjection = projection;
mSelection = selection;
mSelectionArgs = selectionArgs;
mSortOrder = sortOrder;
}
public BoundCursorLoader createBoundCursorLoader(final String bindingId) {
return new BoundCursorLoader(bindingId, mContext, mUri, mProjection, mSelection,
mSelectionArgs, mSortOrder);
}
public Cursor performSynchronousQuery() {
Assert.isNotMainThread();
if (mUri == null) {
// See {@link #getEmptyQueryData}
return null;
} else {
return mContext.getContentResolver().query(mUri, mProjection, mSelection,
mSelectionArgs, mSortOrder);
}
}
@VisibleForTesting
public Uri getUri() {
return mUri;
}
/**
* Representation of an invalid query. {@link #performSynchronousQuery} will return
* a null Cursor.
*/
public static CursorQueryData getEmptyQueryData() {
return new CursorQueryData(null, null, null, null, null, null);
}
}
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