/*
* 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 support.ui.utilities.time;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.Format;
import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* <p>FastDateFormat is a fast and thread-safe version of
* {@link java.text.SimpleDateFormat}.</p>
*
* <p>This class can be used as a direct replacement to
* {@code SimpleDateFormat} in most formatting and parsing situations.
* This class is especially useful in multi-threaded server environments.
* {@code SimpleDateFormat} is not thread-safe in any JDK version,
* nor will it be as Sun have closed the bug/RFE.
* </p>
*
* <p>All patterns are compatible with
* SimpleDateFormat (except time zones and some year patterns - see below).</p>
*
* <p>Since 3.2, FastDateFormat supports parsing as well as printing.</p>
*
* <p>Java 1.4 introduced a new pattern letter, {@code 'Z'}, to represent
* time zones in RFC822 format (eg. {@code +0800} or {@code -1100}).
* This pattern letter can be used here (on all JDK versions).</p>
*
* <p>In addition, the pattern {@code 'ZZ'} has been made to represent
* ISO8601 full format time zones (eg. {@code +08:00} or {@code -11:00}).
* This introduces a minor incompatibility with Java 1.4, but at a gain of
* useful functionality.</p>
*
* <p>Javadoc cites for the year pattern: <i>For formatting, if the number of
* pattern letters is 2, the year is truncated to 2 digits; otherwise it is
* interpreted as a number.</i> Starting with Java 1.7 a pattern of 'Y' or
* 'YYY' will be formatted as '2003', while it was '03' in former Java
* versions. FastDateFormat implements the behavior of Java 7.</p>
*
* @since 2.0
* @version $Id: FastDateFormat.java 1572877 2014-02-28 08:42:25Z britter $
*/
public class FastDateFormat extends Format implements DateParser, DatePrinter {
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 2L;
/**
* 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 final FormatCache<FastDateFormat> cache = new FormatCache<FastDateFormat>() {
@Override
protected FastDateFormat createInstance(final String pattern, final TimeZone timeZone, final Locale locale) {
return new FastDateFormat(pattern, timeZone, locale);
}
};
private final FastDatePrinter printer;
private final FastDateParser parser;
//-----------------------------------------------------------------------
/**
* <p>Gets a formatter instance using the default pattern in the
* default locale.</p>
*
* @return a date/time formatter
*/
public static FastDateFormat getInstance() {
return cache.getInstance();
}
/**
* <p>Gets a formatter instance using the specified pattern in the
* default locale.</p>
*
* @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(final String pattern) {
return cache.getInstance(pattern, null, null);
}
/**
* <p>Gets a formatter instance using the specified pattern and
* time zone.</p>
*
* @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(final String pattern, final TimeZone timeZone) {
return cache.getInstance(pattern, timeZone, null);
}
/**
* <p>Gets a formatter instance using the specified pattern and
* locale.</p>
*
* @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(final String pattern, final Locale locale) {
return cache.getInstance(pattern, null, locale);
}
/**
* <p>Gets a formatter instance using the specified pattern, time zone
* and locale.</p>
*
* @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 {@code null}
*/
public static FastDateFormat getInstance(final String pattern, final TimeZone timeZone, final Locale locale) {
return cache.getInstance(pattern, timeZone, locale);
}
//-----------------------------------------------------------------------
/**
* <p>Gets a date formatter instance using the specified style in the
* default time zone and locale.</p>
*
* @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(final int style) {
return cache.getDateInstance(style, null, null);
}
/**
* <p>Gets a date formatter instance using the specified style and
* locale in the default time zone.</p>
*
* @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(final int style, final Locale locale) {
return cache.getDateInstance(style, null, locale);
}
/**
* <p>Gets a date formatter instance using the specified style and
* time zone in the default locale.</p>
*
* @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(final int style, final TimeZone timeZone) {
return cache.getDateInstance(style, timeZone, null);
}
/**
* <p>Gets a date formatter instance using the specified style, time
* zone and locale.</p>
*
* @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 FastDateFormat getDateInstance(final int style, final TimeZone timeZone, final Locale locale) {
return cache.getDateInstance(style, timeZone, locale);
}
//-----------------------------------------------------------------------
/**
* <p>Gets a time formatter instance using the specified style in the
* default time zone and locale.</p>
*
* @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(final int style) {
return cache.getTimeInstance(style, null, null);
}
/**
* <p>Gets a time formatter instance using the specified style and
* locale in the default time zone.</p>
*
* @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(final int style, final Locale locale) {
return cache.getTimeInstance(style, null, locale);
}
/**
* <p>Gets a time formatter instance using the specified style and
* time zone in the default locale.</p>
*
* @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(final int style, final TimeZone timeZone) {
return cache.getTimeInstance(style, timeZone, null);
}
/**
* <p>Gets a time formatter instance using the specified style, time
* zone and locale.</p>
*
* @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 FastDateFormat getTimeInstance(final int style, final TimeZone timeZone, final Locale locale) {
return cache.getTimeInstance(style, timeZone, locale);
}
//-----------------------------------------------------------------------
/**
* <p>Gets a date/time formatter instance using the specified style
* in the default time zone and locale.</p>
*
* @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(final int dateStyle, final int timeStyle) {
return cache.getDateTimeInstance(dateStyle, timeStyle, null, null);
}
/**
* <p>Gets a date/time formatter instance using the specified style and
* locale in the default time zone.</p>
*
* @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(final int dateStyle, final int timeStyle, final Locale locale) {
return cache.getDateTimeInstance(dateStyle, timeStyle, null, locale);
}
/**
* <p>Gets a date/time formatter instance using the specified style and
* time zone in the default locale.</p>
*
* @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(final int dateStyle, final int timeStyle, final TimeZone timeZone) {
return getDateTimeInstance(dateStyle, timeStyle, timeZone, null);
}
/**
* <p>Gets a date/time formatter instance using the specified style,
* time zone and locale.</p>
*
* @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 FastDateFormat getDateTimeInstance(
final int dateStyle, final int timeStyle, final TimeZone timeZone, final Locale locale) {
return cache.getDateTimeInstance(dateStyle, timeStyle, timeZone, locale);
}
// Constructor
//-----------------------------------------------------------------------
/**
* <p>Constructs a new FastDateFormat.</p>
*
* @param pattern {@link java.text.SimpleDateFormat} compatible pattern
* @param timeZone non-null time zone to use
* @param locale non-null locale to use
* @throws NullPointerException if pattern, timeZone, or locale is null.
*/
protected FastDateFormat(final String pattern, final TimeZone timeZone, final Locale locale) {
this(pattern, timeZone, locale, null);
}
// Constructor
//-----------------------------------------------------------------------
/**
* <p>Constructs a new FastDateFormat.</p>
*
* @param pattern {@link java.text.SimpleDateFormat} compatible pattern
* @param timeZone non-null time zone to use
* @param locale non-null locale to use
* @param centuryStart The start of the 100 year period to use as the "default century" for 2 digit year parsing. If centuryStart is null, defaults to now - 80 years
* @throws NullPointerException if pattern, timeZone, or locale is null.
*/
protected FastDateFormat(final String pattern, final TimeZone timeZone, final Locale locale, final Date centuryStart) {
printer = new FastDatePrinter(pattern, timeZone, locale);
parser = new FastDateParser(pattern, timeZone, locale, centuryStart);
}
// Format methods
//-----------------------------------------------------------------------
/**
* <p>Formats a {@code Date}, {@code Calendar} or
* {@code Long} (milliseconds) object.</p>
*
* @param obj the object to format
* @param toAppendTo the buffer to append to
* @param pos the position - ignored
* @return the buffer passed in
*/
@Override
public StringBuffer format(final Object obj, final StringBuffer toAppendTo, final FieldPosition pos) {
return printer.format(obj, toAppendTo, pos);
}
/**
* <p>Formats a millisecond {@code long} value.</p>
*
* @param millis the millisecond value to format
* @return the formatted string
* @since 2.1
*/
@Override
public String format(final long millis) {
return printer.format(millis);
}
/**
* <p>Formats a {@code Date} object using a {@code GregorianCalendar}.</p>
*
* @param date the date to format
* @return the formatted string
*/
@Override
public String format(final Date date) {
return printer.format(date);
}
/**
* <p>Formats a {@code Calendar} object.</p>
*
* @param calendar the calendar to format
* @return the formatted string
*/
@Override
public String format(final Calendar calendar) {
return printer.format(calendar);
}
/**
* <p>Formats a millisecond {@code long} value into the
* supplied {@code StringBuffer}.</p>
*
* @param millis the millisecond value to format
* @param buf the buffer to format into
* @return the specified string buffer
* @since 2.1
*/
@Override
public StringBuffer format(final long millis, final StringBuffer buf) {
return printer.format(millis, buf);
}
/**
* <p>Formats a {@code Date} object into the
* supplied {@code StringBuffer} using a {@code GregorianCalendar}.</p>
*
* @param date the date to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
@Override
public StringBuffer format(final Date date, final StringBuffer buf) {
return printer.format(date, buf);
}
/**
* <p>Formats a {@code Calendar} object into the
* supplied {@code StringBuffer}.</p>
*
* @param calendar the calendar to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
@Override
public StringBuffer format(final Calendar calendar, final StringBuffer buf) {
return printer.format(calendar, buf);
}
// Parsing
//-----------------------------------------------------------------------
/* (non-Javadoc)
* @see DateParser#parse(java.lang.String)
*/
@Override
public Date parse(final String source) throws ParseException {
return parser.parse(source);
}
/* (non-Javadoc)
* @see DateParser#parse(java.lang.String, java.text.ParsePosition)
*/
@Override
public Date parse(final String source, final ParsePosition pos) {
return parser.parse(source, pos);
}
/* (non-Javadoc)
* @see java.text.Format#parseObject(java.lang.String, java.text.ParsePosition)
*/
@Override
public Object parseObject(final String source, final ParsePosition pos) {
return parser.parseObject(source, pos);
}
// Accessors
//-----------------------------------------------------------------------
/**
* <p>Gets the pattern used by this formatter.</p>
*
* @return the pattern, {@link java.text.SimpleDateFormat} compatible
*/
@Override
public String getPattern() {
return printer.getPattern();
}
/**
* <p>Gets the time zone used by this formatter.</p>
* <p/>
* <p>This zone is always used for {@code Date} formatting. </p>
*
* @return the time zone
*/
@Override
public TimeZone getTimeZone() {
return printer.getTimeZone();
}
/**
* <p>Gets the locale used by this formatter.</p>
*
* @return the locale
*/
@Override
public Locale getLocale() {
return printer.getLocale();
}
/**
* <p>Gets an estimate for the maximum string length that the
* formatter will produce.</p>
* <p/>
* <p>The actual formatted length will almost always be less than or
* equal to this amount.</p>
*
* @return the maximum formatted length
*/
public int getMaxLengthEstimate() {
return printer.getMaxLengthEstimate();
}
// Basics
//-----------------------------------------------------------------------
/**
* <p>Compares two objects for equality.</p>
*
* @param obj the object to compare to
* @return {@code true} if equal
*/
@Override
public boolean equals(final Object obj) {
if (!(obj instanceof FastDateFormat)) {
return false;
}
final FastDateFormat other = (FastDateFormat) obj;
// no need to check parser, as it has same invariants as printer
return printer.equals(other.printer);
}
/**
* <p>Returns a hashcode compatible with equals.</p>
*
* @return a hashcode compatible with equals
*/
@Override
public int hashCode() {
return printer.hashCode();
}
/**
* <p>Gets a debugging string version of this formatter.</p>
*
* @return a debugging string
*/
@Override
public String toString() {
return "FastDateFormat[" + printer.getPattern() + "," + printer.getLocale() + "," + printer.getTimeZone().getID() + "]";
}
/**
* <p>Performs the formatting by applying the rules to the
* specified calendar.</p>
*
* @param calendar the calendar to format
* @param buf the buffer to format into
* @return the specified string buffer
*/
protected StringBuffer applyRules(final Calendar calendar, final StringBuffer buf) {
return printer.applyRules(calendar, buf);
}
}