/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.webkit;
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import android.content.Context;
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import android.content.res.Resources;
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import java.util.Calendar;
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import java.util.Locale;
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import libcore.icu.LocaleData;
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/**
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* Sorts dates into the following groups:
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* Today
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* Yesterday
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* seven days ago
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* one month ago
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* older than a month ago
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*/
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public class DateSorter {
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private static final String LOGTAG = "webkit";
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/** must be >= 3 */
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public static final int DAY_COUNT = 5;
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private long [] mBins = new long[DAY_COUNT-1];
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private String [] mLabels = new String[DAY_COUNT];
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private static final int NUM_DAYS_AGO = 7;
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/**
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* @param context Application context
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*/
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public DateSorter(Context context) {
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Resources resources = context.getResources();
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Calendar c = Calendar.getInstance();
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beginningOfDay(c);
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// Create the bins
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mBins[0] = c.getTimeInMillis(); // Today
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c.add(Calendar.DAY_OF_YEAR, -1);
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mBins[1] = c.getTimeInMillis(); // Yesterday
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c.add(Calendar.DAY_OF_YEAR, -(NUM_DAYS_AGO - 1));
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mBins[2] = c.getTimeInMillis(); // Five days ago
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c.add(Calendar.DAY_OF_YEAR, NUM_DAYS_AGO); // move back to today
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c.add(Calendar.MONTH, -1);
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mBins[3] = c.getTimeInMillis(); // One month ago
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// build labels
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Locale locale = resources.getConfiguration().locale;
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if (locale == null) {
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locale = Locale.getDefault();
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}
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LocaleData localeData = LocaleData.get(locale);
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mLabels[0] = localeData.today;
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mLabels[1] = localeData.yesterday;
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int resId = com.android.internal.R.plurals.last_num_days;
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String format = resources.getQuantityString(resId, NUM_DAYS_AGO);
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mLabels[2] = String.format(format, NUM_DAYS_AGO);
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mLabels[3] = context.getString(com.android.internal.R.string.last_month);
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mLabels[4] = context.getString(com.android.internal.R.string.older);
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}
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/**
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* @param time time since the Epoch in milliseconds, such as that
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* returned by Calendar.getTimeInMillis()
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* @return an index from 0 to (DAY_COUNT - 1) that identifies which
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* date bin this date belongs to
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*/
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public int getIndex(long time) {
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int lastDay = DAY_COUNT - 1;
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for (int i = 0; i < lastDay; i++) {
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if (time > mBins[i]) return i;
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}
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return lastDay;
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}
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/**
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* @param index date bin index as returned by getIndex()
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* @return string label suitable for display to user
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*/
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public String getLabel(int index) {
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if (index < 0 || index >= DAY_COUNT) return "";
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return mLabels[index];
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}
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/**
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* @param index date bin index as returned by getIndex()
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* @return date boundary at given index
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*/
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public long getBoundary(int index) {
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int lastDay = DAY_COUNT - 1;
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// Error case
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if (index < 0 || index > lastDay) index = 0;
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// Since this provides a lower boundary on dates that will be included
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// in the given bin, provide the smallest value
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if (index == lastDay) return Long.MIN_VALUE;
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return mBins[index];
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}
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/**
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* Calcuate 12:00am by zeroing out hour, minute, second, millisecond
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*/
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private void beginningOfDay(Calendar c) {
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c.set(Calendar.HOUR_OF_DAY, 0);
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c.set(Calendar.MINUTE, 0);
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c.set(Calendar.SECOND, 0);
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c.set(Calendar.MILLISECOND, 0);
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}
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}
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