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/*
* Copyright (C) 2017 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.dialer.searchfragment.remote;
import android.content.Context;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.database.MergeCursor;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
import com.android.dialer.common.Assert;
import com.android.dialer.searchfragment.common.SearchCursor;
import com.android.dialer.searchfragment.remote.RemoteDirectoriesCursorLoader.Directory;
import java.util.ArrayList;
import java.util.List;
/**
* {@link MergeCursor} used for combining remote directory cursors into one cursor.
*
* <p>Usually a device with multiple Google accounts will have multiple remote directories returned
* by {@link RemoteDirectoriesCursorLoader}, each represented as a {@link Directory}.
*
* <p>This cursor merges them together with a header at the start of each cursor/list using {@link
* Directory#getDisplayName()} as the header text.
*/
@VisibleForTesting(otherwise = VisibleForTesting.PACKAGE_PRIVATE)
public final class RemoteContactsCursor extends MergeCursor implements SearchCursor {
/**
* Returns a single cursor with headers inserted between each non-empty cursor. If all cursors are
* empty, null or closed, this method returns null.
*/
@Nullable
@VisibleForTesting(otherwise = VisibleForTesting.PACKAGE_PRIVATE)
public static RemoteContactsCursor newInstance(
Context context, Cursor[] cursors, List<Directory> directories) {
Assert.checkArgument(
cursors.length == directories.size(), "Directories and cursors must be the same size.");
Cursor[] cursorsWithHeaders = insertHeaders(context, cursors, directories);
if (cursorsWithHeaders.length > 0) {
return new RemoteContactsCursor(cursorsWithHeaders);
}
return null;
}
private RemoteContactsCursor(Cursor[] cursors) {
super(cursors);
}
private static Cursor[] insertHeaders(
Context context, Cursor[] cursors, List<Directory> directories) {
List<Cursor> cursorList = new ArrayList<>();
for (int i = 0; i < cursors.length; i++) {
Cursor cursor = cursors[i];
if (cursor == null || cursor.isClosed()) {
continue;
}
Directory directory = directories.get(i);
if (cursor.getCount() == 0) {
// Since the cursor isn't being merged in, we need to close it here.
cursor.close();
continue;
}
cursorList.add(createHeaderCursor(context, directory.getDisplayName()));
cursorList.add(cursor);
}
return cursorList.toArray(new Cursor[cursorList.size()]);
}
private static MatrixCursor createHeaderCursor(Context context, String name) {
MatrixCursor headerCursor = new MatrixCursor(HEADER_PROJECTION, 1);
headerCursor.addRow(new String[] {context.getString(R.string.directory, name)});
return headerCursor;
}
/** Returns true if the current position is a header row. */
@Override
public boolean isHeader() {
return !isClosed() && getColumnIndex(HEADER_PROJECTION[HEADER_TEXT_POSITION]) != -1;
}
@Override
public boolean updateQuery(@Nullable String query) {
// When the query changes, a new network request is made for nearby places. Meaning this cursor
// will be closed and another created, so return false.
return false;
}
}
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