com.thoughtworks.xstream.converters.basic.DateConverter Maven / Gradle / Ivy
/*
* Copyright (C) 2003, 2004 Joe Walnes.
* Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012, 2013, 2014, 2015, 2016 XStream Committers.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
* Created on 26. September 2003 by Joe Walnes
*/
package com.thoughtworks.xstream.converters.basic;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.ErrorReporter;
import com.thoughtworks.xstream.converters.ErrorWriter;
import com.thoughtworks.xstream.core.JVM;
import com.thoughtworks.xstream.core.util.ThreadSafeSimpleDateFormat;
/**
* Converts a {@link Date} to a string as a date format, retaining precision down to milliseconds.
*
* The formatted string is by default in UTC and English locale. You can provide a different {@link Locale} and
* {@link TimeZone} that are used for serialization or null to use always the current TimeZone. Note, that
* the default format uses 3-letter time zones that can be ambiguous and may cause wrong results at deserialization and
* is localized since Java 6.
*
*
* Using a Java 7 runtime or higher, the converter supports the datetime
* format defined by W3C (a subset of ISO 8601) at deserialization. Only the formats that also contain the time
* information.
*
*
* Dates in a different era are using a special default pattern that contains the era itself.
*
*
* @author Joe Walnes
* @author Jörg Schaible
*/
public class DateConverter extends AbstractSingleValueConverter implements ErrorReporter {
private static final String[] DEFAULT_ACCEPTABLE_FORMATS;
private static final String DEFAULT_PATTERN;
private static final String DEFAULT_ERA_PATTERN;
private static final TimeZone UTC;
private static final long ERA_START;
static {
UTC = TimeZone.getTimeZone("UTC");
final String defaultPattern = "yyyy-MM-dd HH:mm:ss.S z";
final String defaultEraPattern = "yyyy-MM-dd G HH:mm:ss.S z";
final List acceptablePatterns = new ArrayList();
final boolean utcSupported = JVM.canParseUTCDateFormat();
DEFAULT_PATTERN = utcSupported ? defaultPattern : "yyyy-MM-dd HH:mm:ss.S 'UTC'";
DEFAULT_ERA_PATTERN = utcSupported ? defaultEraPattern : "yyyy-MM-dd G HH:mm:ss.S 'UTC'";
acceptablePatterns.add("yyyy-MM-dd HH:mm:ss.S z");
if (!utcSupported) {
acceptablePatterns.add(defaultPattern);
}
acceptablePatterns.add("yyyy-MM-dd HH:mm:ss.S a");
// JDK 1.3 needs both versions
acceptablePatterns.add("yyyy-MM-dd HH:mm:ssz");
acceptablePatterns.add("yyyy-MM-dd HH:mm:ss z");
if (!utcSupported) {
acceptablePatterns.add("yyyy-MM-dd HH:mm:ss 'UTC'");
}
if (JVM.canParseISO8601TimeZoneInDateFormat()) {
acceptablePatterns.add("yyyy-MM-dd'T'HH:mm:ss.SX");
acceptablePatterns.add("yyyy-MM-dd'T'HH:mm:ssX");
acceptablePatterns.add("yyyy-MM-dd'T'HH:mmX");
}
// backwards compatibility
acceptablePatterns.add("yyyy-MM-dd HH:mm:ssa");
DEFAULT_ACCEPTABLE_FORMATS = (String[]) acceptablePatterns.toArray(new String[acceptablePatterns.size()]);
final Calendar cal = Calendar.getInstance();
cal.setTimeZone(UTC);
cal.clear();
cal.set(1, Calendar.JANUARY, 1);
ERA_START = cal.getTime().getTime(); // calendar.getTimeInMillis() not available under JDK 1.3
}
private final ThreadSafeSimpleDateFormat defaultFormat;
private final ThreadSafeSimpleDateFormat defaultEraFormat;
private final ThreadSafeSimpleDateFormat[] acceptableFormats;
/**
* Construct a DateConverter with standard formats and lenient set off.
*/
public DateConverter() {
this(false);
}
/**
* Construct a DateConverter with standard formats, lenient set off and uses a given
* TimeZone for serialization.
*
* @param timeZone the TimeZone used to serialize the Date
* @since 1.4
*/
public DateConverter(final TimeZone timeZone) {
this(DEFAULT_PATTERN, DEFAULT_ACCEPTABLE_FORMATS, timeZone);
}
/**
* Construct a DateConverter with standard formats and using UTC.
*
* @param lenient the lenient setting of {@link SimpleDateFormat#setLenient(boolean)}
* @since 1.3
*/
public DateConverter(final boolean lenient) {
this(DEFAULT_PATTERN, DEFAULT_ACCEPTABLE_FORMATS, lenient);
}
/**
* Construct a DateConverter with lenient set off using UTC.
*
* @param defaultFormat the default format
* @param acceptableFormats fallback formats
*/
public DateConverter(final String defaultFormat, final String[] acceptableFormats) {
this(defaultFormat, acceptableFormats, false);
}
/**
* Construct a DateConverter with a given TimeZone and lenient set off.
*
* @param defaultFormat the default format
* @param acceptableFormats fallback formats
* @since 1.4
*/
public DateConverter(final String defaultFormat, final String[] acceptableFormats, final TimeZone timeZone) {
this(defaultFormat, acceptableFormats, timeZone, false);
}
/**
* Construct a DateConverter.
*
* @param defaultFormat the default format
* @param acceptableFormats fallback formats
* @param lenient the lenient setting of {@link SimpleDateFormat#setLenient(boolean)}
* @since 1.3
*/
public DateConverter(final String defaultFormat, final String[] acceptableFormats, final boolean lenient) {
this(defaultFormat, acceptableFormats, UTC, lenient);
}
/**
* Construct a DateConverter.
*
* @param defaultFormat the default format
* @param acceptableFormats fallback formats
* @param timeZone the TimeZone used to serialize the Date
* @param lenient the lenient setting of {@link SimpleDateFormat#setLenient(boolean)}
* @since 1.4
*/
public DateConverter(
final String defaultFormat, final String[] acceptableFormats, final TimeZone timeZone, final boolean lenient) {
this(DEFAULT_ERA_PATTERN, defaultFormat, acceptableFormats, Locale.ENGLISH, timeZone, lenient);
}
/**
* Construct a DateConverter.
*
* @param defaultEraFormat the default format for dates in a different era (may be
* null to drop era support)
* @param defaultFormat the default format
* @param acceptableFormats fallback formats
* @param locale locale to use for the format
* @param timeZone the TimeZone used to serialize the Date
* @param lenient the lenient setting of {@link SimpleDateFormat#setLenient(boolean)}
* @since 1.4.4
*/
public DateConverter(
final String defaultEraFormat, final String defaultFormat, final String[] acceptableFormats,
final Locale locale, final TimeZone timeZone, final boolean lenient) {
if (defaultEraFormat != null) {
this.defaultEraFormat = new ThreadSafeSimpleDateFormat(
defaultEraFormat, timeZone, locale, 4, 20, lenient);
} else {
this.defaultEraFormat = null;
}
this.defaultFormat = new ThreadSafeSimpleDateFormat(
defaultFormat, timeZone, locale, 4, 20, lenient);
this.acceptableFormats = acceptableFormats != null
? new ThreadSafeSimpleDateFormat[acceptableFormats.length]
: new ThreadSafeSimpleDateFormat[0];
for (int i = 0; i < this.acceptableFormats.length; i++ ) {
this.acceptableFormats[i] = new ThreadSafeSimpleDateFormat(
acceptableFormats[i], timeZone, locale, 1, 20, lenient);
}
}
public boolean canConvert(Class type) {
return type.equals(Date.class);
}
public Object fromString(String str) {
if (defaultEraFormat != null) {
try {
return defaultEraFormat.parse(str);
} catch (ParseException e) {
// try next ...
}
}
if (defaultEraFormat != defaultFormat) {
try {
return defaultFormat.parse(str);
} catch (ParseException e) {
// try next ...
}
}
for (int i = 0; i < acceptableFormats.length; i++ ) {
try {
return acceptableFormats[i].parse(str);
} catch (ParseException e3) {
// no worries, let's try the next format.
}
}
// no dateFormats left to try
ConversionException exception = new ConversionException("Cannot parse date");
exception.add("date", str);
throw exception;
}
public String toString(Object obj) {
final Date date = (Date)obj;
if (date.getTime() < ERA_START && defaultEraFormat != null) {
return defaultEraFormat.format(date);
} else {
return defaultFormat.format(date);
}
}
public void appendErrors(ErrorWriter errorWriter) {
errorWriter.add("Default date pattern", defaultFormat.toString());
if (defaultEraFormat != null) {
errorWriter.add("Default era date pattern", defaultEraFormat.toString());
}
for (int i = 0; i < acceptableFormats.length; i++ ) {
errorWriter.add("Alternative date pattern", acceptableFormats[i].toString());
}
}
}
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