283 lines
10 KiB
Java
283 lines
10 KiB
Java
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/*
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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.util;
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import android.content.res.Resources;
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import android.content.res.XmlResourceParser;
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import org.apache.harmony.luni.internal.util.ZoneInfoDB;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.TimeZone;
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import java.util.Date;
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import com.android.internal.util.XmlUtils;
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/**
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* A class containing utility methods related to time zones.
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*/
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public class TimeUtils {
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private static final String TAG = "TimeUtils";
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/**
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* Tries to return a time zone that would have had the specified offset
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* and DST value at the specified moment in the specified country.
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* Returns null if no suitable zone could be found.
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*/
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public static TimeZone getTimeZone(int offset, boolean dst, long when, String country) {
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if (country == null) {
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return null;
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}
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TimeZone best = null;
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Resources r = Resources.getSystem();
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XmlResourceParser parser = r.getXml(com.android.internal.R.xml.time_zones_by_country);
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Date d = new Date(when);
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TimeZone current = TimeZone.getDefault();
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String currentName = current.getID();
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int currentOffset = current.getOffset(when);
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boolean currentDst = current.inDaylightTime(d);
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try {
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XmlUtils.beginDocument(parser, "timezones");
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while (true) {
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XmlUtils.nextElement(parser);
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String element = parser.getName();
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if (element == null || !(element.equals("timezone"))) {
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break;
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}
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String code = parser.getAttributeValue(null, "code");
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if (country.equals(code)) {
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if (parser.next() == XmlPullParser.TEXT) {
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String maybe = parser.getText();
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// If the current time zone is from the right country
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// and meets the other known properties, keep it
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// instead of changing to another one.
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if (maybe.equals(currentName)) {
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if (currentOffset == offset && currentDst == dst) {
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return current;
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}
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}
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// Otherwise, take the first zone from the right
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// country that has the correct current offset and DST.
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// (Keep iterating instead of returning in case we
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// haven't encountered the current time zone yet.)
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if (best == null) {
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TimeZone tz = TimeZone.getTimeZone(maybe);
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if (tz.getOffset(when) == offset &&
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tz.inDaylightTime(d) == dst) {
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best = tz;
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}
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}
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}
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}
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}
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} catch (XmlPullParserException e) {
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Log.e(TAG, "Got exception while getting preferred time zone.", e);
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} catch (IOException e) {
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Log.e(TAG, "Got exception while getting preferred time zone.", e);
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} finally {
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parser.close();
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}
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return best;
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}
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/**
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* Returns a String indicating the version of the time zone database currently
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* in use. The format of the string is dependent on the underlying time zone
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* database implementation, but will typically contain the year in which the database
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* was updated plus a letter from a to z indicating changes made within that year.
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*
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* <p>Time zone database updates should be expected to occur periodically due to
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* political and legal changes that cannot be anticipated in advance. Therefore,
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* when computing the UTC time for a future event, applications should be aware that
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* the results may differ following a time zone database update. This method allows
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* applications to detect that a database change has occurred, and to recalculate any
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* cached times accordingly.
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*
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* <p>The time zone database may be assumed to change only when the device runtime
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* is restarted. Therefore, it is not necessary to re-query the database version
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* during the lifetime of an activity.
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*/
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public static String getTimeZoneDatabaseVersion() {
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return ZoneInfoDB.getVersion();
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}
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/** @hide Field length that can hold 999 days of time */
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public static final int HUNDRED_DAY_FIELD_LEN = 19;
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private static final int SECONDS_PER_MINUTE = 60;
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private static final int SECONDS_PER_HOUR = 60 * 60;
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private static final int SECONDS_PER_DAY = 24 * 60 * 60;
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private static final Object sFormatSync = new Object();
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private static char[] sFormatStr = new char[HUNDRED_DAY_FIELD_LEN+5];
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static private int accumField(int amt, int suffix, boolean always, int zeropad) {
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if (amt > 99 || (always && zeropad >= 3)) {
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return 3+suffix;
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}
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if (amt > 9 || (always && zeropad >= 2)) {
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return 2+suffix;
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}
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if (always || amt > 0) {
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return 1+suffix;
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}
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return 0;
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}
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static private int printField(char[] formatStr, int amt, char suffix, int pos,
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boolean always, int zeropad) {
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if (always || amt > 0) {
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final int startPos = pos;
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if ((always && zeropad >= 3) || amt > 99) {
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int dig = amt/100;
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formatStr[pos] = (char)(dig + '0');
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pos++;
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amt -= (dig*100);
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}
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if ((always && zeropad >= 2) || amt > 9 || startPos != pos) {
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int dig = amt/10;
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formatStr[pos] = (char)(dig + '0');
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pos++;
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amt -= (dig*10);
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}
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formatStr[pos] = (char)(amt + '0');
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pos++;
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formatStr[pos] = suffix;
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pos++;
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}
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return pos;
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}
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private static int formatDurationLocked(long duration, int fieldLen) {
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if (sFormatStr.length < fieldLen) {
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sFormatStr = new char[fieldLen];
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}
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char[] formatStr = sFormatStr;
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if (duration == 0) {
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int pos = 0;
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fieldLen -= 1;
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while (pos < fieldLen) {
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formatStr[pos] = ' ';
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}
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formatStr[pos] = '0';
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return pos+1;
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}
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char prefix;
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if (duration > 0) {
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prefix = '+';
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} else {
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prefix = '-';
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duration = -duration;
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}
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int millis = (int)(duration%1000);
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int seconds = (int) Math.floor(duration / 1000);
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int days = 0, hours = 0, minutes = 0;
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if (seconds > SECONDS_PER_DAY) {
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days = seconds / SECONDS_PER_DAY;
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seconds -= days * SECONDS_PER_DAY;
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}
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if (seconds > SECONDS_PER_HOUR) {
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hours = seconds / SECONDS_PER_HOUR;
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seconds -= hours * SECONDS_PER_HOUR;
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}
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if (seconds > SECONDS_PER_MINUTE) {
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minutes = seconds / SECONDS_PER_MINUTE;
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seconds -= minutes * SECONDS_PER_MINUTE;
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}
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int pos = 0;
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if (fieldLen != 0) {
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int myLen = accumField(days, 1, false, 0);
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myLen += accumField(hours, 1, myLen > 0, 2);
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myLen += accumField(minutes, 1, myLen > 0, 2);
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myLen += accumField(seconds, 1, myLen > 0, 2);
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myLen += accumField(millis, 2, true, myLen > 0 ? 3 : 0) + 1;
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while (myLen < fieldLen) {
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formatStr[pos] = ' ';
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pos++;
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myLen++;
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}
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}
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formatStr[pos] = prefix;
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pos++;
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int start = pos;
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boolean zeropad = fieldLen != 0;
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pos = printField(formatStr, days, 'd', pos, false, 0);
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pos = printField(formatStr, hours, 'h', pos, pos != start, zeropad ? 2 : 0);
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pos = printField(formatStr, minutes, 'm', pos, pos != start, zeropad ? 2 : 0);
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pos = printField(formatStr, seconds, 's', pos, pos != start, zeropad ? 2 : 0);
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pos = printField(formatStr, millis, 'm', pos, true, (zeropad && pos != start) ? 3 : 0);
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formatStr[pos] = 's';
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return pos + 1;
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}
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/** @hide Just for debugging; not internationalized. */
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public static void formatDuration(long duration, StringBuilder builder) {
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synchronized (sFormatSync) {
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int len = formatDurationLocked(duration, 0);
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builder.append(sFormatStr, 0, len);
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}
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}
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/** @hide Just for debugging; not internationalized. */
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public static void formatDuration(long duration, PrintWriter pw, int fieldLen) {
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synchronized (sFormatSync) {
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int len = formatDurationLocked(duration, fieldLen);
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pw.print(new String(sFormatStr, 0, len));
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}
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}
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/** @hide Just for debugging; not internationalized. */
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public static void formatDuration(long duration, PrintWriter pw) {
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formatDuration(duration, pw, 0);
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}
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/** @hide Just for debugging; not internationalized. */
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public static void formatDuration(long time, long now, PrintWriter pw) {
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if (time == 0) {
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pw.print("--");
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return;
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}
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formatDuration(time-now, pw, 0);
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}
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}
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