com.groupbyinc.common.jackson.databind.util.ISO8601DateFormat Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.util;
import java.text.*;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
* Provide a fast thread-safe formatter/parser DateFormat for ISO8601 dates ONLY.
* It was mainly done to be used with Jackson JSON Processor.
*
* Watch out for clone implementation that returns itself.
*
* All other methods but parse and format and clone are undefined behavior.
*
* @see ISO8601Utils
*/
public class ISO8601DateFormat extends DateFormat
{
private static final long serialVersionUID = 1L;
// those classes are to try to allow a consistent behavior for hascode/equals and other methods
private static Calendar CALENDAR = new GregorianCalendar();
private static NumberFormat NUMBER_FORMAT = new DecimalFormat();
public ISO8601DateFormat() {
this.numberFormat = NUMBER_FORMAT;
this.calendar = CALENDAR;
}
@Override
public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
String value = ISO8601Utils.format(date);
toAppendTo.append(value);
return toAppendTo;
}
@Override
public Date parse(String source, ParsePosition pos) {
try {
return ISO8601Utils.parse(source, pos);
}
catch (ParseException e) {
return null;
}
}
//supply our own parse(String) since pos isn't updated during parsing,
//but the exception should have the right error offset.
@Override
public Date parse(String source) throws ParseException {
return ISO8601Utils.parse(source, new ParsePosition(0));
}
@Override
public Object clone() {
/* Jackson calls clone for every call. Since this instance is
* immutable (and hence thread-safe)
* we can just return this instance
*/
return this;
}
@Override
public String toString() { return getClass().getName(); }
}