1/*
2 * Copyright (C) 2008 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 com.android.music;
18
19import android.database.Cursor;
20import android.provider.MediaStore;
21import android.widget.AlphabetIndexer;
22
23/**
24 * Handles comparisons in a different way because the Album, Song and Artist name
25 * are stripped of some prefixes such as "a", "an", "the" and some symbols.
26 *
27 */
28class MusicAlphabetIndexer extends AlphabetIndexer {
29
30    public MusicAlphabetIndexer(Cursor cursor, int sortedColumnIndex, CharSequence alphabet) {
31        super(cursor, sortedColumnIndex, alphabet);
32    }
33
34    @Override
35    protected int compare(String word, String letter) {
36        String wordKey = MediaStore.Audio.keyFor(word);
37        String letterKey = MediaStore.Audio.keyFor(letter);
38        if (wordKey.startsWith(letter)) {
39            return 0;
40        } else {
41            return wordKey.compareTo(letterKey);
42        }
43    }
44}
45