1/*
2 * Copyright (C) 2006 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 android.webkit;
18
19import android.content.Context;
20import android.content.res.Resources;
21
22import java.util.Calendar;
23import java.util.Locale;
24
25import libcore.icu.LocaleData;
26
27/**
28 * Sorts dates into the following groups:
29 *   Today
30 *   Yesterday
31 *   seven days ago
32 *   one month ago
33 *   older than a month ago
34 */
35
36public class DateSorter {
37
38    private static final String LOGTAG = "webkit";
39
40    /** must be >= 3 */
41    public static final int DAY_COUNT = 5;
42
43    private long [] mBins = new long[DAY_COUNT-1];
44    private String [] mLabels = new String[DAY_COUNT];
45
46    private static final int NUM_DAYS_AGO = 7;
47
48    /**
49     * @param context Application context
50     */
51    public DateSorter(Context context) {
52        Resources resources = context.getResources();
53
54        Calendar c = Calendar.getInstance();
55        beginningOfDay(c);
56
57        // Create the bins
58        mBins[0] = c.getTimeInMillis(); // Today
59        c.add(Calendar.DAY_OF_YEAR, -1);
60        mBins[1] = c.getTimeInMillis();  // Yesterday
61        c.add(Calendar.DAY_OF_YEAR, -(NUM_DAYS_AGO - 1));
62        mBins[2] = c.getTimeInMillis();  // Five days ago
63        c.add(Calendar.DAY_OF_YEAR, NUM_DAYS_AGO); // move back to today
64        c.add(Calendar.MONTH, -1);
65        mBins[3] = c.getTimeInMillis();  // One month ago
66
67        // build labels
68        Locale locale = resources.getConfiguration().locale;
69        if (locale == null) {
70            locale = Locale.getDefault();
71        }
72        LocaleData localeData = LocaleData.get(locale);
73        mLabels[0] = localeData.today;
74        mLabels[1] = localeData.yesterday;
75
76        int resId = com.android.internal.R.plurals.last_num_days;
77        String format = resources.getQuantityString(resId, NUM_DAYS_AGO);
78        mLabels[2] = String.format(format, NUM_DAYS_AGO);
79
80        mLabels[3] = context.getString(com.android.internal.R.string.last_month);
81        mLabels[4] = context.getString(com.android.internal.R.string.older);
82    }
83
84    /**
85     * @param time time since the Epoch in milliseconds, such as that
86     * returned by Calendar.getTimeInMillis()
87     * @return an index from 0 to (DAY_COUNT - 1) that identifies which
88     * date bin this date belongs to
89     */
90    public int getIndex(long time) {
91        int lastDay = DAY_COUNT - 1;
92        for (int i = 0; i < lastDay; i++) {
93            if (time > mBins[i]) return i;
94        }
95        return lastDay;
96    }
97
98    /**
99     * @param index date bin index as returned by getIndex()
100     * @return string label suitable for display to user
101     */
102    public String getLabel(int index) {
103        if (index < 0 || index >= DAY_COUNT) return "";
104        return mLabels[index];
105    }
106
107
108    /**
109     * @param index date bin index as returned by getIndex()
110     * @return date boundary at given index
111     */
112    public long getBoundary(int index) {
113        int lastDay = DAY_COUNT - 1;
114        // Error case
115        if (index < 0 || index > lastDay) index = 0;
116        // Since this provides a lower boundary on dates that will be included
117        // in the given bin, provide the smallest value
118        if (index == lastDay) return Long.MIN_VALUE;
119        return mBins[index];
120    }
121
122    /**
123     * Calcuate 12:00am by zeroing out hour, minute, second, millisecond
124     */
125    private void beginningOfDay(Calendar c) {
126        c.set(Calendar.HOUR_OF_DAY, 0);
127        c.set(Calendar.MINUTE, 0);
128        c.set(Calendar.SECOND, 0);
129        c.set(Calendar.MILLISECOND, 0);
130    }
131}
132