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.Date;
24import java.util.Locale;
25
26import libcore.icu.LocaleData;
27
28/**
29 * Sorts dates into the following groups:
30 *   Today
31 *   Yesterday
32 *   seven days ago
33 *   one month ago
34 *   older than a month ago
35 */
36
37public class DateSorter {
38
39    private static final String LOGTAG = "webkit";
40
41    /** must be >= 3 */
42    public static final int DAY_COUNT = 5;
43
44    private long [] mBins = new long[DAY_COUNT-1];
45    private String [] mLabels = new String[DAY_COUNT];
46
47    private static final int NUM_DAYS_AGO = 7;
48
49    /**
50     * @param context Application context
51     */
52    public DateSorter(Context context) {
53        Resources resources = context.getResources();
54
55        Calendar c = Calendar.getInstance();
56        beginningOfDay(c);
57
58        // Create the bins
59        mBins[0] = c.getTimeInMillis(); // Today
60        c.add(Calendar.DAY_OF_YEAR, -1);
61        mBins[1] = c.getTimeInMillis();  // Yesterday
62        c.add(Calendar.DAY_OF_YEAR, -(NUM_DAYS_AGO - 1));
63        mBins[2] = c.getTimeInMillis();  // Five days ago
64        c.add(Calendar.DAY_OF_YEAR, NUM_DAYS_AGO); // move back to today
65        c.add(Calendar.MONTH, -1);
66        mBins[3] = c.getTimeInMillis();  // One month ago
67
68        // build labels
69        Locale locale = resources.getConfiguration().locale;
70        if (locale == null) {
71            locale = Locale.getDefault();
72        }
73        LocaleData localeData = LocaleData.get(locale);
74        mLabels[0] = localeData.today;
75        mLabels[1] = localeData.yesterday;
76
77        int resId = com.android.internal.R.plurals.last_num_days;
78        String format = resources.getQuantityString(resId, NUM_DAYS_AGO);
79        mLabels[2] = String.format(format, NUM_DAYS_AGO);
80
81        mLabels[3] = context.getString(com.android.internal.R.string.last_month);
82        mLabels[4] = context.getString(com.android.internal.R.string.older);
83    }
84
85    /**
86     * @param time time since the Epoch in milliseconds, such as that
87     * returned by Calendar.getTimeInMillis()
88     * @return an index from 0 to (DAY_COUNT - 1) that identifies which
89     * date bin this date belongs to
90     */
91    public int getIndex(long time) {
92        int lastDay = DAY_COUNT - 1;
93        for (int i = 0; i < lastDay; i++) {
94            if (time > mBins[i]) return i;
95        }
96        return lastDay;
97    }
98
99    /**
100     * @param index date bin index as returned by getIndex()
101     * @return string label suitable for display to user
102     */
103    public String getLabel(int index) {
104        if (index < 0 || index >= DAY_COUNT) return "";
105        return mLabels[index];
106    }
107
108
109    /**
110     * @param index date bin index as returned by getIndex()
111     * @return date boundary at given index
112     */
113    public long getBoundary(int index) {
114        int lastDay = DAY_COUNT - 1;
115        // Error case
116        if (index < 0 || index > lastDay) index = 0;
117        // Since this provides a lower boundary on dates that will be included
118        // in the given bin, provide the smallest value
119        if (index == lastDay) return Long.MIN_VALUE;
120        return mBins[index];
121    }
122
123    /**
124     * Calcuate 12:00am by zeroing out hour, minute, second, millisecond
125     */
126    private void beginningOfDay(Calendar c) {
127        c.set(Calendar.HOUR_OF_DAY, 0);
128        c.set(Calendar.MINUTE, 0);
129        c.set(Calendar.SECOND, 0);
130        c.set(Calendar.MILLISECOND, 0);
131    }
132}
133