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Commons.Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang.time;
import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.text.FieldPosition;
import java.text.Format;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import org.apache.commons.lang.Validate;
/**
* FastDateFormat is a fast and thread-safe version of
* {@link java.text.SimpleDateFormat}.
*
* This class can be used as a direct replacement to
* SimpleDateFormat in most formatting situations.
* This class is especially useful in multi-threaded server environments.
* SimpleDateFormat is not thread-safe in any JDK version,
* nor will it be as Sun have closed the bug/RFE.
*
*
* Only formatting is supported, but all patterns are compatible with
* SimpleDateFormat (except time zones - see below).
*
* Java 1.4 introduced a new pattern letter, 'Z', to represent
* time zones in RFC822 format (eg. +0800 or -1100).
* This pattern letter can be used here (on all JDK versions).
*
* In addition, the pattern 'ZZ' has been made to represent
* ISO8601 full format time zones (eg. +08:00 or -11:00).
* This introduces a minor incompatibility with Java 1.4, but at a gain of
* useful functionality.
*
* @author TeaTrove project
* @author Brian S O'Neill
* @author Sean Schofield
* @author Gary Gregory
* @author Stephen Colebourne
* @author Nikolay Metchev
* @since 2.0
* @version $Id: FastDateFormat.java 437554 2006-08-28 06:21:41Z bayard $
*/
public class FastDateFormat extends Format {
// A lot of the speed in this class comes from caching, but some comes
// from the special int to StringBuffer conversion.
//
// The following produces a padded 2 digit number:
// buffer.append((char)(value / 10 + '0'));
// buffer.append((char)(value % 10 + '0'));
//
// Note that the fastest append to StringBuffer is a single char (used here).
// Note that Integer.toString() is not called, the conversion is simply
// taking the value and adding (mathematically) the ASCII value for '0'.
// So, don't change this code! It works and is very fast.
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 1L;
/**
* FULL locale dependent date or time style.
*/
public static final int FULL = DateFormat.FULL;
/**
* LONG locale dependent date or time style.
*/
public static final int LONG = DateFormat.LONG;
/**
* MEDIUM locale dependent date or time style.
*/
public static final int MEDIUM = DateFormat.MEDIUM;
/**
* SHORT locale dependent date or time style.
*/
public static final int SHORT = DateFormat.SHORT;
private static String cDefaultPattern;
private static Map cInstanceCache = new HashMap(7);
private static Map cDateInstanceCache = new HashMap(7);
private static Map cTimeInstanceCache = new HashMap(7);
private static Map cDateTimeInstanceCache = new HashMap(7);
private static Map cTimeZoneDisplayCache = new HashMap(7);
/**
* The pattern.
*/
private final String mPattern;
/**
* The time zone.
*/
private final TimeZone mTimeZone;
/**
* Whether the time zone overrides any on Calendars.
*/
private final boolean mTimeZoneForced;
/**
* The locale.
*/
private final Locale mLocale;
/**
* Whether the locale overrides the default.
*/
private final boolean mLocaleForced;
/**
* The parsed rules.
*/
private Rule[] mRules;
/**
* The estimated maximum length.
*/
private int mMaxLengthEstimate;
//-----------------------------------------------------------------------
/**
* Gets a formatter instance using the default pattern in the
* default locale.
*
* @return a date/time formatter
*/
public static FastDateFormat getInstance() {
return getInstance(getDefaultPattern(), null, null);
}
/**
* Gets a formatter instance using the specified pattern in the
* default locale.
*
* @param pattern {@link java.text.SimpleDateFormat} compatible
* pattern
* @return a pattern based date/time formatter
* @throws IllegalArgumentException if pattern is invalid
*/
public static FastDateFormat getInstance(String pattern) {
return getInstance(pattern, null, null);
}
/**
* Gets a formatter instance using the specified pattern and
* time zone.
*
* @param pattern {@link java.text.SimpleDateFormat} compatible
* pattern
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @return a pattern based date/time formatter
* @throws IllegalArgumentException if pattern is invalid
*/
public static FastDateFormat getInstance(String pattern, TimeZone timeZone) {
return getInstance(pattern, timeZone, null);
}
/**
* Gets a formatter instance using the specified pattern and
* locale.
*
* @param pattern {@link java.text.SimpleDateFormat} compatible
* pattern
* @param locale optional locale, overrides system locale
* @return a pattern based date/time formatter
* @throws IllegalArgumentException if pattern is invalid
*/
public static FastDateFormat getInstance(String pattern, Locale locale) {
return getInstance(pattern, null, locale);
}
/**
* Gets a formatter instance using the specified pattern, time zone
* and locale.
*
* @param pattern {@link java.text.SimpleDateFormat} compatible
* pattern
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @param locale optional locale, overrides system locale
* @return a pattern based date/time formatter
* @throws IllegalArgumentException if pattern is invalid
* or null
*/
public static synchronized FastDateFormat getInstance(String pattern, TimeZone timeZone, Locale locale) {
FastDateFormat emptyFormat = new FastDateFormat(pattern, timeZone, locale);
FastDateFormat format = (FastDateFormat) cInstanceCache.get(emptyFormat);
if (format == null) {
format = emptyFormat;
format.init(); // convert shell format into usable one
cInstanceCache.put(format, format); // this is OK!
}
return format;
}
//-----------------------------------------------------------------------
/**
* Gets a date formatter instance using the specified style in the
* default time zone and locale.
*
* @param style date style: FULL, LONG, MEDIUM, or SHORT
* @return a localized standard date formatter
* @throws IllegalArgumentException if the Locale has no date
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateInstance(int style) {
return getDateInstance(style, null, null);
}
/**
* Gets a date formatter instance using the specified style and
* locale in the default time zone.
*
* @param style date style: FULL, LONG, MEDIUM, or SHORT
* @param locale optional locale, overrides system locale
* @return a localized standard date formatter
* @throws IllegalArgumentException if the Locale has no date
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateInstance(int style, Locale locale) {
return getDateInstance(style, null, locale);
}
/**
* Gets a date formatter instance using the specified style and
* time zone in the default locale.
*
* @param style date style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @return a localized standard date formatter
* @throws IllegalArgumentException if the Locale has no date
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateInstance(int style, TimeZone timeZone) {
return getDateInstance(style, timeZone, null);
}
/**
* Gets a date formatter instance using the specified style, time
* zone and locale.
*
* @param style date style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @param locale optional locale, overrides system locale
* @return a localized standard date formatter
* @throws IllegalArgumentException if the Locale has no date
* pattern defined
*/
public static synchronized FastDateFormat getDateInstance(int style, TimeZone timeZone, Locale locale) {
Object key = new Integer(style);
if (timeZone != null) {
key = new Pair(key, timeZone);
}
if (locale != null) {
key = new Pair(key, locale);
}
FastDateFormat format = (FastDateFormat) cDateInstanceCache.get(key);
if (format == null) {
if (locale == null) {
locale = Locale.getDefault();
}
try {
SimpleDateFormat formatter = (SimpleDateFormat) DateFormat.getDateInstance(style, locale);
String pattern = formatter.toPattern();
format = getInstance(pattern, timeZone, locale);
cDateInstanceCache.put(key, format);
} catch (ClassCastException ex) {
throw new IllegalArgumentException("No date pattern for locale: " + locale);
}
}
return format;
}
//-----------------------------------------------------------------------
/**
* Gets a time formatter instance using the specified style in the
* default time zone and locale.
*
* @param style time style: FULL, LONG, MEDIUM, or SHORT
* @return a localized standard time formatter
* @throws IllegalArgumentException if the Locale has no time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getTimeInstance(int style) {
return getTimeInstance(style, null, null);
}
/**
* Gets a time formatter instance using the specified style and
* locale in the default time zone.
*
* @param style time style: FULL, LONG, MEDIUM, or SHORT
* @param locale optional locale, overrides system locale
* @return a localized standard time formatter
* @throws IllegalArgumentException if the Locale has no time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getTimeInstance(int style, Locale locale) {
return getTimeInstance(style, null, locale);
}
/**
* Gets a time formatter instance using the specified style and
* time zone in the default locale.
*
* @param style time style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted time
* @return a localized standard time formatter
* @throws IllegalArgumentException if the Locale has no time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getTimeInstance(int style, TimeZone timeZone) {
return getTimeInstance(style, timeZone, null);
}
/**
* Gets a time formatter instance using the specified style, time
* zone and locale.
*
* @param style time style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted time
* @param locale optional locale, overrides system locale
* @return a localized standard time formatter
* @throws IllegalArgumentException if the Locale has no time
* pattern defined
*/
public static synchronized FastDateFormat getTimeInstance(int style, TimeZone timeZone, Locale locale) {
Object key = new Integer(style);
if (timeZone != null) {
key = new Pair(key, timeZone);
}
if (locale != null) {
key = new Pair(key, locale);
}
FastDateFormat format = (FastDateFormat) cTimeInstanceCache.get(key);
if (format == null) {
if (locale == null) {
locale = Locale.getDefault();
}
try {
SimpleDateFormat formatter = (SimpleDateFormat) DateFormat.getTimeInstance(style, locale);
String pattern = formatter.toPattern();
format = getInstance(pattern, timeZone, locale);
cTimeInstanceCache.put(key, format);
} catch (ClassCastException ex) {
throw new IllegalArgumentException("No date pattern for locale: " + locale);
}
}
return format;
}
//-----------------------------------------------------------------------
/**
* Gets a date/time formatter instance using the specified style
* in the default time zone and locale.
*
* @param dateStyle date style: FULL, LONG, MEDIUM, or SHORT
* @param timeStyle time style: FULL, LONG, MEDIUM, or SHORT
* @return a localized standard date/time formatter
* @throws IllegalArgumentException if the Locale has no date/time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateTimeInstance(
int dateStyle, int timeStyle) {
return getDateTimeInstance(dateStyle, timeStyle, null, null);
}
/**
* Gets a date/time formatter instance using the specified style and
* locale in the default time zone.
*
* @param dateStyle date style: FULL, LONG, MEDIUM, or SHORT
* @param timeStyle time style: FULL, LONG, MEDIUM, or SHORT
* @param locale optional locale, overrides system locale
* @return a localized standard date/time formatter
* @throws IllegalArgumentException if the Locale has no date/time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateTimeInstance(
int dateStyle, int timeStyle, Locale locale) {
return getDateTimeInstance(dateStyle, timeStyle, null, locale);
}
/**
* Gets a date/time formatter instance using the specified style and
* time zone in the default locale.
*
* @param dateStyle date style: FULL, LONG, MEDIUM, or SHORT
* @param timeStyle time style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @return a localized standard date/time formatter
* @throws IllegalArgumentException if the Locale has no date/time
* pattern defined
* @since 2.1
*/
public static FastDateFormat getDateTimeInstance(
int dateStyle, int timeStyle, TimeZone timeZone) {
return getDateTimeInstance(dateStyle, timeStyle, timeZone, null);
}
/**
* Gets a date/time formatter instance using the specified style,
* time zone and locale.
*
* @param dateStyle date style: FULL, LONG, MEDIUM, or SHORT
* @param timeStyle time style: FULL, LONG, MEDIUM, or SHORT
* @param timeZone optional time zone, overrides time zone of
* formatted date
* @param locale optional locale, overrides system locale
* @return a localized standard date/time formatter
* @throws IllegalArgumentException if the Locale has no date/time
* pattern defined
*/
public static synchronized FastDateFormat getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone,
Locale locale) {
Object key = new Pair(new Integer(dateStyle), new Integer(timeStyle));
if (timeZone != null) {
key = new Pair(key, timeZone);
}
if (locale != null) {
key = new Pair(key, locale);
}
FastDateFormat format = (FastDateFormat) cDateTimeInstanceCache.get(key);
if (format == null) {
if (locale == null) {
locale = Locale.getDefault();
}
try {
SimpleDateFormat formatter = (SimpleDateFormat) DateFormat.getDateTimeInstance(dateStyle, timeStyle,
locale);
String pattern = formatter.toPattern();
format = getInstance(pattern, timeZone, locale);
cDateTimeInstanceCache.put(key, format);
} catch (ClassCastException ex) {
throw new IllegalArgumentException("No date time pattern for locale: " + locale);
}
}
return format;
}
//-----------------------------------------------------------------------
/**
* Gets the time zone display name, using a cache for performance.
*
* @param tz the zone to query
* @param daylight true if daylight savings
* @param style the style to use TimeZone.LONG
* or TimeZone.SHORT
* @param locale the locale to use
* @return the textual name of the time zone
*/
static synchronized String getTimeZoneDisplay(TimeZone tz, boolean daylight, int style, Locale locale) {
Object key = new TimeZoneDisplayKey(tz, daylight, style, locale);
String value = (String) cTimeZoneDisplayCache.get(key);
if (value == null) {
// This is a very slow call, so cache the results.
value = tz.getDisplayName(daylight, style, locale);
cTimeZoneDisplayCache.put(key, value);
}
return value;
}
/**
* Gets the default pattern.
*
* @return the default pattern
*/
private static synchronized String getDefaultPattern() {
if (cDefaultPattern == null) {
cDefaultPattern = new SimpleDateFormat().toPattern();
}
return cDefaultPattern;
}
// Constructor
//-----------------------------------------------------------------------
/**
* Constructs a new FastDateFormat.
*
* @param pattern {@link java.text.SimpleDateFormat} compatible
* pattern
* @param timeZone time zone to use, null means use
* default for Date and value within for
* Calendar
* @param locale locale, null means use system
* default
* @throws IllegalArgumentException if pattern is invalid or
* null
*/
protected FastDateFormat(String pattern, TimeZone timeZone, Locale locale) {
super();
if (pattern == null) {
throw new IllegalArgumentException("The pattern must not be null");
}
mPattern = pattern;
mTimeZoneForced = (timeZone != null);
if (timeZone == null) {
timeZone = TimeZone.getDefault();
}
mTimeZone = timeZone;
mLocaleForced = (locale != null);
if (locale == null) {
locale = Locale.getDefault();
}
mLocale = locale;
}
/**
* Initializes the instance for first use.
*/
protected void init() {
List rulesList = parsePattern();
mRules = (Rule[]) rulesList.toArray(new Rule[rulesList.size()]);
int len = 0;
for (int i=mRules.length; --i >= 0; ) {
len += mRules[i].estimateLength();
}
mMaxLengthEstimate = len;
}
// Parse the pattern
//-----------------------------------------------------------------------
/**
* Returns a list of Rules given a pattern.
*
* @return a List of Rule objects
* @throws IllegalArgumentException if pattern is invalid
*/
protected List parsePattern() {
DateFormatSymbols symbols = new DateFormatSymbols(mLocale);
List rules = new ArrayList();
String[] ERAs = symbols.getEras();
String[] months = symbols.getMonths();
String[] shortMonths = symbols.getShortMonths();
String[] weekdays = symbols.getWeekdays();
String[] shortWeekdays = symbols.getShortWeekdays();
String[] AmPmStrings = symbols.getAmPmStrings();
int length = mPattern.length();
int[] indexRef = new int[1];
for (int i = 0; i < length; i++) {
indexRef[0] = i;
String token = parseToken(mPattern, indexRef);
i = indexRef[0];
int tokenLen = token.length();
if (tokenLen == 0) {
break;
}
Rule rule;
char c = token.charAt(0);
switch (c) {
case 'G': // era designator (text)
rule = new TextField(Calendar.ERA, ERAs);
break;
case 'y': // year (number)
if (tokenLen >= 4) {
rule = selectNumberRule(Calendar.YEAR, tokenLen);
} else {
rule = TwoDigitYearField.INSTANCE;
}
break;
case 'M': // month in year (text and number)
if (tokenLen >= 4) {
rule = new TextField(Calendar.MONTH, months);
} else if (tokenLen == 3) {
rule = new TextField(Calendar.MONTH, shortMonths);
} else if (tokenLen == 2) {
rule = TwoDigitMonthField.INSTANCE;
} else {
rule = UnpaddedMonthField.INSTANCE;
}
break;
case 'd': // day in month (number)
rule = selectNumberRule(Calendar.DAY_OF_MONTH, tokenLen);
break;
case 'h': // hour in am/pm (number, 1..12)
rule = new TwelveHourField(selectNumberRule(Calendar.HOUR, tokenLen));
break;
case 'H': // hour in day (number, 0..23)
rule = selectNumberRule(Calendar.HOUR_OF_DAY, tokenLen);
break;
case 'm': // minute in hour (number)
rule = selectNumberRule(Calendar.MINUTE, tokenLen);
break;
case 's': // second in minute (number)
rule = selectNumberRule(Calendar.SECOND, tokenLen);
break;
case 'S': // millisecond (number)
rule = selectNumberRule(Calendar.MILLISECOND, tokenLen);
break;
case 'E': // day in week (text)
rule = new TextField(Calendar.DAY_OF_WEEK, tokenLen < 4 ? shortWeekdays : weekdays);
break;
case 'D': // day in year (number)
rule = selectNumberRule(Calendar.DAY_OF_YEAR, tokenLen);
break;
case 'F': // day of week in month (number)
rule = selectNumberRule(Calendar.DAY_OF_WEEK_IN_MONTH, tokenLen);
break;
case 'w': // week in year (number)
rule = selectNumberRule(Calendar.WEEK_OF_YEAR, tokenLen);
break;
case 'W': // week in month (number)
rule = selectNumberRule(Calendar.WEEK_OF_MONTH, tokenLen);
break;
case 'a': // am/pm marker (text)
rule = new TextField(Calendar.AM_PM, AmPmStrings);
break;
case 'k': // hour in day (1..24)
rule = new TwentyFourHourField(selectNumberRule(Calendar.HOUR_OF_DAY, tokenLen));
break;
case 'K': // hour in am/pm (0..11)
rule = selectNumberRule(Calendar.HOUR, tokenLen);
break;
case 'z': // time zone (text)
if (tokenLen >= 4) {
rule = new TimeZoneNameRule(mTimeZone, mTimeZoneForced, mLocale, TimeZone.LONG);
} else {
rule = new TimeZoneNameRule(mTimeZone, mTimeZoneForced, mLocale, TimeZone.SHORT);
}
break;
case 'Z': // time zone (value)
if (tokenLen == 1) {
rule = TimeZoneNumberRule.INSTANCE_NO_COLON;
} else {
rule = TimeZoneNumberRule.INSTANCE_COLON;
}
break;
case '\'': // literal text
String sub = token.substring(1);
if (sub.length() == 1) {
rule = new CharacterLiteral(sub.charAt(0));
} else {
rule = new StringLiteral(sub);
}
break;
default:
throw new IllegalArgumentException("Illegal pattern component: " + token);
}
rules.add(rule);
}
return rules;
}
/**
* Performs the parsing of tokens.
*
* @param pattern the pattern
* @param indexRef index references
* @return parsed token
*/
protected String parseToken(String pattern, int[] indexRef) {
StringBuffer buf = new StringBuffer();
int i = indexRef[0];
int length = pattern.length();
char c = pattern.charAt(i);
if (c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z') {
// Scan a run of the same character, which indicates a time
// pattern.
buf.append(c);
while (i + 1 < length) {
char peek = pattern.charAt(i + 1);
if (peek == c) {
buf.append(c);
i++;
} else {
break;
}
}
} else {
// This will identify token as text.
buf.append('\'');
boolean inLiteral = false;
for (; i < length; i++) {
c = pattern.charAt(i);
if (c == '\'') {
if (i + 1 < length && pattern.charAt(i + 1) == '\'') {
// '' is treated as escaped '
i++;
buf.append(c);
} else {
inLiteral = !inLiteral;
}
} else if (!inLiteral &&
(c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z')) {
i--;
break;
} else {
buf.append(c);
}
}
}
indexRef[0] = i;
return buf.toString();
}
/**
* Gets an appropriate rule for the padding required.
*
* @param field the field to get a rule for
* @param padding the padding required
* @return a new rule with the correct padding
*/
protected NumberRule selectNumberRule(int field, int padding) {
switch (padding) {
case 1:
return new UnpaddedNumberField(field);
case 2:
return new TwoDigitNumberField(field);
default:
return new PaddedNumberField(field, padding);
}
}
// Format methods
//-----------------------------------------------------------------------
/**
* Formats a Date, Calendar or
* Long (milliseconds) object.
*
* @param obj the object to format
* @param toAppendTo the buffer to append to
* @param pos the position - ignored
* @return the buffer passed in
*/
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
if (obj instanceof Date) {
return format((Date) obj, toAppendTo);
} else if (obj instanceof Calendar) {
return format((Calendar) obj, toAppendTo);
} else if (obj instanceof Long) {
return format(((Long) obj).longValue(), toAppendTo);
} else {
throw new IllegalArgumentException("Unknown class: " +
(obj == null ? "" : obj.getClass().getName()));
}
}
/**
* Formats a millisecond long value.
*
* @param millis the millisecond value to format
* @return the formatted string
* @since 2.1
*/
public String format(long millis) {
return format(new Date(millis));
}
/**
* Formats a Date object.
*
* @param date the date to format
* @return the formatted string
*/
public String format(Date date) {
Calendar c = new GregorianCalendar(mTimeZone);
c.setTime(date);
return applyRules(c, new StringBuffer(mMaxLengthEstimate)).toString();
}
/**
* Formats a Calendar object.
*
* @param calendar the calendar to format
* @return the formatted string
*/
public String format(Calendar calendar) {
return format(calendar, new StringBuffer(mMaxLengthEstimate)).toString();
}
/**
* Formats a milliseond long value into the
* supplied StringBuffer.
*
* @param millis the millisecond value to format
* @param buf the buffer to format into
* @return the specified string buffer
* @since 2.1
*/
public StringBuffer format(long millis, StringBuffer buf) {
return format(new Date(millis), buf);
}
/**
* Formats a Date object into the
* supplied StringBuffer.
*
* @param date the date to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
public StringBuffer format(Date date, StringBuffer buf) {
Calendar c = new GregorianCalendar(mTimeZone);
c.setTime(date);
return applyRules(c, buf);
}
/**
* Formats a Calendar object into the
* supplied StringBuffer.
*
* @param calendar the calendar to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
public StringBuffer format(Calendar calendar, StringBuffer buf) {
if (mTimeZoneForced) {
calendar = (Calendar) calendar.clone();
calendar.setTimeZone(mTimeZone);
}
return applyRules(calendar, buf);
}
/**
* Performs the formatting by applying the rules to the
* specified calendar.
*
* @param calendar the calendar to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
protected StringBuffer applyRules(Calendar calendar, StringBuffer buf) {
Rule[] rules = mRules;
int len = mRules.length;
for (int i = 0; i < len; i++) {
rules[i].appendTo(buf, calendar);
}
return buf;
}
// Parsing
//-----------------------------------------------------------------------
/**
* Parsing is not supported.
*
* @param source the string to parse
* @param pos the parsing position
* @return null as not supported
*/
public Object parseObject(String source, ParsePosition pos) {
pos.setIndex(0);
pos.setErrorIndex(0);
return null;
}
// Accessors
//-----------------------------------------------------------------------
/**
* Gets the pattern used by this formatter.
*
* @return the pattern, {@link java.text.SimpleDateFormat} compatible
*/
public String getPattern() {
return mPattern;
}
/**
* Gets the time zone used by this formatter.
*
* This zone is always used for Date formatting.
* If a Calendar is passed in to be formatted, the
* time zone on that may be used depending on
* {@link #getTimeZoneOverridesCalendar()}.
*
* @return the time zone
*/
public TimeZone getTimeZone() {
return mTimeZone;
}
/**
* Returns true if the time zone of the
* calendar overrides the time zone of the formatter.
*
* @return true if time zone of formatter
* overridden for calendars
*/
public boolean getTimeZoneOverridesCalendar() {
return mTimeZoneForced;
}
/**
* Gets the locale used by this formatter.
*
* @return the locale
*/
public Locale getLocale() {
return mLocale;
}
/**
* Gets an estimate for the maximum string length that the
* formatter will produce.
*
* The actual formatted length will almost always be less than or
* equal to this amount.
*
* @return the maximum formatted length
*/
public int getMaxLengthEstimate() {
return mMaxLengthEstimate;
}
// Basics
//-----------------------------------------------------------------------
/**
* Compares two objects for equality.
*
* @param obj the object to compare to
* @return true if equal
*/
public boolean equals(Object obj) {
if (obj instanceof FastDateFormat == false) {
return false;
}
FastDateFormat other = (FastDateFormat) obj;
if (
(mPattern == other.mPattern || mPattern.equals(other.mPattern)) &&
(mTimeZone == other.mTimeZone || mTimeZone.equals(other.mTimeZone)) &&
(mLocale == other.mLocale || mLocale.equals(other.mLocale)) &&
(mTimeZoneForced == other.mTimeZoneForced) &&
(mLocaleForced == other.mLocaleForced)
) {
return true;
}
return false;
}
/**
* Returns a hashcode compatible with equals.
*
* @return a hashcode compatible with equals
*/
public int hashCode() {
int total = 0;
total += mPattern.hashCode();
total += mTimeZone.hashCode();
total += (mTimeZoneForced ? 1 : 0);
total += mLocale.hashCode();
total += (mLocaleForced ? 1 : 0);
return total;
}
/**
* Gets a debugging string version of this formatter.
*
* @return a debugging string
*/
public String toString() {
return "FastDateFormat[" + mPattern + "]";
}
// Rules
//-----------------------------------------------------------------------
/**
* Inner class defining a rule.
*/
private interface Rule {
/**
* Returns the estimated lentgh of the result.
*
* @return the estimated length
*/
int estimateLength();
/**
* Appends the value of the specified calendar to the output buffer based on the rule implementation.
*
* @param buffer the output buffer
* @param calendar calendar to be appended
*/
void appendTo(StringBuffer buffer, Calendar calendar);
}
/**
* Inner class defining a numeric rule.
*/
private interface NumberRule extends Rule {
/**
* Appends the specified value to the output buffer based on the rule implementation.
*
* @param buffer the output buffer
* @param value the value to be appended
*/
void appendTo(StringBuffer buffer, int value);
}
/**
* Inner class to output a constant single character.
*/
private static class CharacterLiteral implements Rule {
private final char mValue;
/**
* Constructs a new instance of CharacterLiteral
* to hold the specified value.
*
* @param value the character literal
*/
CharacterLiteral(char value) {
mValue = value;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 1;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
buffer.append(mValue);
}
}
/**
* Inner class to output a constant string.
*/
private static class StringLiteral implements Rule {
private final String mValue;
/**
* Constructs a new instance of StringLiteral
* to hold the specified value.
*
* @param value the string literal
*/
StringLiteral(String value) {
mValue = value;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return mValue.length();
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
buffer.append(mValue);
}
}
/**
* Inner class to output one of a set of values.
*/
private static class TextField implements Rule {
private final int mField;
private final String[] mValues;
/**
* Constructs an instance of TextField
* with the specified field and values.
*
* @param field the field
* @param values the field values
*/
TextField(int field, String[] values) {
mField = field;
mValues = values;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
int max = 0;
for (int i=mValues.length; --i >= 0; ) {
int len = mValues[i].length();
if (len > max) {
max = len;
}
}
return max;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
buffer.append(mValues[calendar.get(mField)]);
}
}
/**
* Inner class to output an unpadded number.
*/
private static class UnpaddedNumberField implements NumberRule {
static final UnpaddedNumberField INSTANCE_YEAR = new UnpaddedNumberField(Calendar.YEAR);
private final int mField;
/**
* Constructs an instance of UnpadedNumberField with the specified field.
*
* @param field the field
*/
UnpaddedNumberField(int field) {
mField = field;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 4;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
if (value < 10) {
buffer.append((char)(value + '0'));
} else if (value < 100) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
buffer.append(Integer.toString(value));
}
}
}
/**
* Inner class to output an unpadded month.
*/
private static class UnpaddedMonthField implements NumberRule {
static final UnpaddedMonthField INSTANCE = new UnpaddedMonthField();
/**
* Constructs an instance of UnpaddedMonthField.
*
*/
UnpaddedMonthField() {
super();
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 2;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.MONTH) + 1);
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
if (value < 10) {
buffer.append((char)(value + '0'));
} else {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
}
/**
* Inner class to output a padded number.
*/
private static class PaddedNumberField implements NumberRule {
private final int mField;
private final int mSize;
/**
* Constructs an instance of PaddedNumberField.
*
* @param field the field
* @param size size of the output field
*/
PaddedNumberField(int field, int size) {
if (size < 3) {
// Should use UnpaddedNumberField or TwoDigitNumberField.
throw new IllegalArgumentException();
}
mField = field;
mSize = size;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 4;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
if (value < 100) {
for (int i = mSize; --i >= 2; ) {
buffer.append('0');
}
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
int digits;
if (value < 1000) {
digits = 3;
} else {
Validate.isTrue(value > -1, "Negative values should not be possible", value);
digits = Integer.toString(value).length();
}
for (int i = mSize; --i >= digits; ) {
buffer.append('0');
}
buffer.append(Integer.toString(value));
}
}
}
/**
* Inner class to output a two digit number.
*/
private static class TwoDigitNumberField implements NumberRule {
private final int mField;
/**
* Constructs an instance of TwoDigitNumberField with the specified field.
*
* @param field the field
*/
TwoDigitNumberField(int field) {
mField = field;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 2;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
if (value < 100) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
buffer.append(Integer.toString(value));
}
}
}
/**
* Inner class to output a two digit year.
*/
private static class TwoDigitYearField implements NumberRule {
static final TwoDigitYearField INSTANCE = new TwoDigitYearField();
/**
* Constructs an instance of TwoDigitYearField.
*/
TwoDigitYearField() {
super();
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 2;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.YEAR) % 100);
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
/**
* Inner class to output a two digit month.
*/
private static class TwoDigitMonthField implements NumberRule {
static final TwoDigitMonthField INSTANCE = new TwoDigitMonthField();
/**
* Constructs an instance of TwoDigitMonthField.
*/
TwoDigitMonthField() {
super();
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 2;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.MONTH) + 1);
}
/**
* {@inheritDoc}
*/
public final void appendTo(StringBuffer buffer, int value) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
/**
* Inner class to output the twelve hour field.
*/
private static class TwelveHourField implements NumberRule {
private final NumberRule mRule;
/**
* Constructs an instance of TwelveHourField with the specified
* NumberRule.
*
* @param rule the rule
*/
TwelveHourField(NumberRule rule) {
mRule = rule;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return mRule.estimateLength();
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
int value = calendar.get(Calendar.HOUR);
if (value == 0) {
value = calendar.getLeastMaximum(Calendar.HOUR) + 1;
}
mRule.appendTo(buffer, value);
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, int value) {
mRule.appendTo(buffer, value);
}
}
/**
* Inner class to output the twenty four hour field.
*/
private static class TwentyFourHourField implements NumberRule {
private final NumberRule mRule;
/**
* Constructs an instance of TwentyFourHourField with the specified
* NumberRule.
*
* @param rule the rule
*/
TwentyFourHourField(NumberRule rule) {
mRule = rule;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return mRule.estimateLength();
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
int value = calendar.get(Calendar.HOUR_OF_DAY);
if (value == 0) {
value = calendar.getMaximum(Calendar.HOUR_OF_DAY) + 1;
}
mRule.appendTo(buffer, value);
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, int value) {
mRule.appendTo(buffer, value);
}
}
/**
* Inner class to output a time zone name.
*/
private static class TimeZoneNameRule implements Rule {
private final TimeZone mTimeZone;
private final boolean mTimeZoneForced;
private final Locale mLocale;
private final int mStyle;
private final String mStandard;
private final String mDaylight;
/**
* Constructs an instance of TimeZoneNameRule with the specified properties.
*
* @param timeZone the time zone
* @param timeZoneForced if true the time zone is forced into standard and daylight
* @param locale the locale
* @param style the style
*/
TimeZoneNameRule(TimeZone timeZone, boolean timeZoneForced, Locale locale, int style) {
mTimeZone = timeZone;
mTimeZoneForced = timeZoneForced;
mLocale = locale;
mStyle = style;
if (timeZoneForced) {
mStandard = getTimeZoneDisplay(timeZone, false, style, locale);
mDaylight = getTimeZoneDisplay(timeZone, true, style, locale);
} else {
mStandard = null;
mDaylight = null;
}
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
if (mTimeZoneForced) {
return Math.max(mStandard.length(), mDaylight.length());
} else if (mStyle == TimeZone.SHORT) {
return 4;
} else {
return 40;
}
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
if (mTimeZoneForced) {
if (mTimeZone.useDaylightTime() && calendar.get(Calendar.DST_OFFSET) != 0) {
buffer.append(mDaylight);
} else {
buffer.append(mStandard);
}
} else {
TimeZone timeZone = calendar.getTimeZone();
if (timeZone.useDaylightTime() && calendar.get(Calendar.DST_OFFSET) != 0) {
buffer.append(getTimeZoneDisplay(timeZone, true, mStyle, mLocale));
} else {
buffer.append(getTimeZoneDisplay(timeZone, false, mStyle, mLocale));
}
}
}
}
/**
* Inner class to output a time zone as a number +/-HHMM
* or +/-HH:MM.
*/
private static class TimeZoneNumberRule implements Rule {
static final TimeZoneNumberRule INSTANCE_COLON = new TimeZoneNumberRule(true);
static final TimeZoneNumberRule INSTANCE_NO_COLON = new TimeZoneNumberRule(false);
final boolean mColon;
/**
* Constructs an instance of TimeZoneNumberRule with the specified properties.
*
* @param colon add colon between HH and MM in the output if true
*/
TimeZoneNumberRule(boolean colon) {
mColon = colon;
}
/**
* {@inheritDoc}
*/
public int estimateLength() {
return 5;
}
/**
* {@inheritDoc}
*/
public void appendTo(StringBuffer buffer, Calendar calendar) {
int offset = calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET);
if (offset < 0) {
buffer.append('-');
offset = -offset;
} else {
buffer.append('+');
}
int hours = offset / (60 * 60 * 1000);
buffer.append((char)(hours / 10 + '0'));
buffer.append((char)(hours % 10 + '0'));
if (mColon) {
buffer.append(':');
}
int minutes = offset / (60 * 1000) - 60 * hours;
buffer.append((char)(minutes / 10 + '0'));
buffer.append((char)(minutes % 10 + '0'));
}
}
// ----------------------------------------------------------------------
/**
* Inner class that acts as a compound key for time zone names.
*/
private static class TimeZoneDisplayKey {
private final TimeZone mTimeZone;
private final int mStyle;
private final Locale mLocale;
/**
* Constructs an instance of TimeZoneDisplayKey with the specified properties.
*
* @param timeZone the time zone
* @param daylight adjust the style for daylight saving time if true
* @param style the timezone style
* @param locale the timezone locale
*/
TimeZoneDisplayKey(TimeZone timeZone,
boolean daylight, int style, Locale locale) {
mTimeZone = timeZone;
if (daylight) {
style |= 0x80000000;
}
mStyle = style;
mLocale = locale;
}
/**
* {@inheritDoc}
*/
public int hashCode() {
return mStyle * 31 + mLocale.hashCode();
}
/**
* {@inheritDoc}
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof TimeZoneDisplayKey) {
TimeZoneDisplayKey other = (TimeZoneDisplayKey)obj;
return
mTimeZone.equals(other.mTimeZone) &&
mStyle == other.mStyle &&
mLocale.equals(other.mLocale);
}
return false;
}
}
// ----------------------------------------------------------------------
/**
* Helper class for creating compound objects.
*
* One use for this class is to create a hashtable key
* out of multiple objects.
*/
private static class Pair {
private final Object mObj1;
private final Object mObj2;
/**
* Constructs an instance of Pair to hold the specified objects.
* @param obj1 one object in the pair
* @param obj2 second object in the pair
*/
public Pair(Object obj1, Object obj2) {
mObj1 = obj1;
mObj2 = obj2;
}
/**
* {@inheritDoc}
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Pair)) {
return false;
}
Pair key = (Pair)obj;
return
(mObj1 == null ?
key.mObj1 == null : mObj1.equals(key.mObj1)) &&
(mObj2 == null ?
key.mObj2 == null : mObj2.equals(key.mObj2));
}
/**
* {@inheritDoc}
*/
public int hashCode() {
return
(mObj1 == null ? 0 : mObj1.hashCode()) +
(mObj2 == null ? 0 : mObj2.hashCode());
}
/**
* {@inheritDoc}
*/
public String toString() {
return "[" + mObj1 + ':' + mObj2 + ']';
}
}
}