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/*
* SonarQube, open source software quality management tool.
* Copyright (C) 2008-2014 SonarSource
* mailto:contact AT sonarsource DOT com
*
* SonarQube is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* SonarQube is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.api.utils;
import javax.annotation.Nullable;
import java.io.NotSerializableException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Parses and formats <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a> dates.
* This class is thread-safe.
*
* @since 2.7
*/
public final class DateUtils {
public static final String DATE_FORMAT = "yyyy-MM-dd";
public static final String DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ";
private static final ThreadSafeDateFormat THREAD_SAFE_DATE_FORMAT = new ThreadSafeDateFormat(DATE_FORMAT);
private static final ThreadSafeDateFormat THREAD_SAFE_DATETIME_FORMAT = new ThreadSafeDateFormat(DATETIME_FORMAT);
private DateUtils() {
}
public static String formatDate(Date d) {
return THREAD_SAFE_DATE_FORMAT.format(d);
}
public static String formatDateTime(Date d) {
return THREAD_SAFE_DATETIME_FORMAT.format(d);
}
/**
* @param s string in format {@link #DATE_FORMAT}
* @throws SonarException when string cannot be parsed
*/
public static Date parseDate(String s) {
ParsePosition pos = new ParsePosition(0);
Date result = THREAD_SAFE_DATE_FORMAT.parse(s, pos);
if (pos.getIndex() != s.length()) {
throw new SonarException("The date '" + s + "' does not respect format '" + DATE_FORMAT + "'");
}
return result;
}
/**
* Parse format {@link #DATE_FORMAT}. This method never throws exception.
*
* @param s any string
* @return the date, null if parsing error or null string
* @since 3.0
*/
public static Date parseDateQuietly(@Nullable String s) {
Date date = null;
if (s != null) {
try {
date = parseDate(s);
} catch (RuntimeException e) {
// ignore
}
}
return date;
}
/**
* @param s string in format {@link #DATETIME_FORMAT}
* @throws SonarException when string cannot be parsed
*/
public static Date parseDateTime(String s) {
ParsePosition pos = new ParsePosition(0);
Date result = THREAD_SAFE_DATETIME_FORMAT.parse(s, pos);
if (pos.getIndex() != s.length()) {
throw new SonarException("The date '" + s + "' does not respect format '" + DATETIME_FORMAT + "'");
}
return result;
}
/**
* Parse format {@link #DATETIME_FORMAT}. This method never throws exception.
*
* @param s any string
* @return the datetime, null if parsing error or null string
*/
public static Date parseDateTimeQuietly(@Nullable String s) {
Date datetime = null;
if (s != null) {
try {
datetime = parseDateTime(s);
} catch (RuntimeException e) {
// ignore
}
}
return datetime;
}
static class ThreadSafeDateFormat extends DateFormat {
private final String format;
ThreadSafeDateFormat(String format) {
this.format = format;
}
private final ThreadLocal<Reference<DateFormat>> cache = new ThreadLocal<Reference<DateFormat>>() {
@Override
public Reference<DateFormat> get() {
Reference<DateFormat> softRef = super.get();
if (softRef == null || softRef.get() == null) {
softRef = new SoftReference<DateFormat>(new SimpleDateFormat(format));
super.set(softRef);
}
return softRef;
}
};
private DateFormat getDateFormat() {
return (DateFormat) ((Reference) cache.get()).get();
}
@Override
public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
return getDateFormat().format(date, toAppendTo, fieldPosition);
}
@Override
public Date parse(String source, ParsePosition pos) {
return getDateFormat().parse(source, pos);
}
private void readObject(ObjectInputStream ois) throws NotSerializableException {
throw new NotSerializableException();
}
private void writeObject(ObjectOutputStream ois) throws NotSerializableException {
throw new NotSerializableException();
}
}
}
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