1/*
2 * Copyright (C) 2013 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.printspooler;
18
19import android.content.Context;
20import android.print.PrintAttributes.MediaSize;
21import android.util.ArrayMap;
22
23import java.util.Comparator;
24import java.util.Map;
25
26/**
27 * Utility functions and classes for dealing with media sizes.
28 */
29public class MediaSizeUtils {
30
31    private static Map<MediaSize, String> sMediaSizeToStandardMap;
32
33    /**
34     * Gets the default media size for the current locale.
35     *
36     * @param context Context for accessing resources.
37     * @return The default media size.
38     */
39    public static MediaSize getDefault(Context context) {
40        String mediaSizeId = context.getString(R.string.mediasize_default);
41        return MediaSize.getStandardMediaSizeById(mediaSizeId);
42    }
43
44    private static String getStandardForMediaSize(Context context, MediaSize mediaSize) {
45        if (sMediaSizeToStandardMap == null) {
46            sMediaSizeToStandardMap = new ArrayMap<MediaSize, String>();
47            String[] mediaSizeToStandardMapValues = context.getResources()
48                    .getStringArray(R.array.mediasize_to_standard_map);
49            final int mediaSizeToStandardCount = mediaSizeToStandardMapValues.length;
50            for (int i = 0; i < mediaSizeToStandardCount; i += 2) {
51                String mediaSizeId = mediaSizeToStandardMapValues[i];
52                MediaSize key = MediaSize.getStandardMediaSizeById(mediaSizeId);
53                String value = mediaSizeToStandardMapValues[i + 1];
54                sMediaSizeToStandardMap.put(key, value);
55            }
56        }
57        String standard = sMediaSizeToStandardMap.get(mediaSize);
58        return (standard != null) ? standard : context.getString(
59                R.string.mediasize_standard_iso);
60    }
61
62    /**
63     * Comparator for ordering standard media sizes. The ones for the current
64     * standard go to the top and the ones for the other standards follow grouped
65     * by standard. Media sizes of the same standard are ordered alphabetically.
66     */
67    public static final class MediaSizeComparator implements Comparator<MediaSize> {
68        private final Context mContext;
69
70        public MediaSizeComparator(Context context) {
71            mContext = context;
72        }
73
74        @Override
75        public int compare(MediaSize lhs, MediaSize rhs) {
76            String currentStandard = mContext.getString(R.string.mediasize_standard);
77            String lhsStandard = getStandardForMediaSize(mContext, lhs);
78            String rhsStandard = getStandardForMediaSize(mContext, rhs);
79
80            // The current standard always wins.
81            if (lhsStandard.equals(currentStandard)) {
82                if (!rhsStandard.equals(currentStandard)) {
83                    return -1;
84                }
85            } else if (rhsStandard.equals(currentStandard)) {
86                return 1;
87            }
88
89            if (!lhsStandard.equals(rhsStandard)) {
90                // Different standards - use the standard ordering.
91                return lhsStandard.compareTo(rhsStandard);
92            } else {
93                // Same standard - sort alphabetically by label.
94                return lhs.getLabel(mContext.getPackageManager()).
95                        compareTo(rhs.getLabel(mContext.getPackageManager()));
96            }
97        }
98    }
99}
100