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Common, generally useful utilities
/* The contents of this file are subject to the license and copyright terms
* detailed in the license directory at the root of the source tree (also
* available online at http://fedora-commons.org/license/).
*/
package org.fcrepo.utilities;
import java.text.ParseException;
import java.util.Date;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
/**
* A collection of utility methods for performing frequently required tasks.
*
* @author Ross Wayland
* @author Frank Asseg
*/
public abstract class DateUtility {
// private static final Date ONE_BCE = new Date(-62198755200000L);
private static final Date ONE_CE = new Date(-62135596800000L);
private static final DateTimeFormatter FORMATTER_MILLISECONDS_T_Z = DateTimeFormat
.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
private static final DateTimeFormatter FORMATTER_MILLISECONDS_T = DateTimeFormat
.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
private static final DateTimeFormatter FORMATTER_SECONDS_T_Z = DateTimeFormat
.forPattern("yyyy-MM-dd'T'HH:mm:ss'Z'");
private static final DateTimeFormatter FORMATTER_SECONDS_T = DateTimeFormat
.forPattern("yyyy-MM-dd'T'HH:mm:ss");
private static final DateTimeFormatter FORMATTER_SECONDS_Z = DateTimeFormat
.forPattern("HH:mm:ss.SSS'Z'");
private static final DateTimeFormatter FORMATTER_DATE_Z = DateTimeFormat
.forPattern("yyyy-MM-dd'Z'");
private static final DateTimeFormatter FORMATTER_DATE = DateTimeFormat
.forPattern("yyyy-MM-dd");
private static final DateTimeFormatter FORMATTER_TIMEZONE = DateTimeFormat
.forPattern("EEE, dd MMMM yyyyy HH:mm:ss");
static {
DateTimeZone.setDefault(DateTimeZone.UTC);
}
/**
* Converts a datetime string into and instance of java.util.Date using the
* date format: yyyy-MM-ddTHH:mm:ss.SSSZ.
*
* @param dateTime
* A datetime string
* @return Corresponding instance of java.util.Date (returns null if
* dateTime string argument is empty string or null)
*/
public static Date convertStringToDate(String dateTime) {
return parseDateLoose(dateTime);
}
/**
* Converts an instance of java.util.Date into a String using the date
* format: yyyy-MM-ddTHH:mm:ss.SSSZ.
*
* @param date
* Instance of java.util.Date.
* @return ISO 8601 String representation (yyyy-MM-ddTHH:mm:ss.SSSZ) of the
* Date argument or null if the Date argument is null.
*/
public static String convertDateToString(Date date) {
return convertDateToString(date, true);
}
/**
* Converts an instance of java.util.Date into an ISO 8601 String
* representation. Uses the date format yyyy-MM-ddTHH:mm:ss.SSSZ or
* yyyy-MM-ddTHH:mm:ssZ, depending on whether millisecond precision is
* desired.
*
* @param date
* Instance of java.util.Date.
* @param millis
* Whether or not the return value should include milliseconds.
* @return ISO 8601 String representation of the Date argument or null if
* the Date argument is null.
*/
public static String convertDateToString(Date date, boolean millis) {
if (date == null) {
return null;
} else {
DateTimeFormatter df;
if (millis) {
// df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
df = FORMATTER_MILLISECONDS_T_Z;
} else {
// df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
df = FORMATTER_SECONDS_T_Z;
}
return df.print(date.getTime());
}
}
/**
* Converts an instance of Date into the canonical lexical
* representation of an XSD dateTime with the following exceptions: - Dates
* before 1 CE (i.e. 1 AD) are handled according to ISO 8601:2000 Second
* Edition: "0000" is the lexical representation of 1 BCE "-0001" is the
* lexical representation of 2 BCE
*
* @param date
* Instance of java.util.Date.
* @return the lexical form of the XSD dateTime value, e.g.
* "2006-11-13T09:40:55.001Z".
* @see 3.2.7.2
* Canonical representation
*/
public static String convertDateToXSDString(Date date) {
if (date == null) {
return null;
}
String dateTime = convertDateToString(date, true);
if (date.before(ONE_CE)) {
// fix the format for lexical representation of the year
// e.g. 1 BCE: 0000-01.01 (1BCE is year 0)
int pos = dateTime.indexOf('-', 1);
int year = Integer.parseInt(dateTime.substring(0, pos));
if (year == -1) {
dateTime = "0000" + dateTime.substring(pos);
} else if (year < 0) {
year += 1;
String prefix = "";
if (year > -10) {
prefix = "000";
} else if (year > -100) {
prefix = "00";
} else if (year > -1000) {
prefix = "0";
}
dateTime = "-" + prefix + Math.abs(year)
+ dateTime.substring(pos);
}
}
// fix the format for the lexical representation of the milliseconds,
// no leading 0s are allowed, and if it's all zeros it has to be
// removed.
int posDot = dateTime.indexOf('.');
int posZ = dateTime.indexOf('Z');
int millis = Integer.parseInt(dateTime.substring(posDot + 1, posZ));
String milliString;
if (millis == 0) {
milliString = "";
} else if (millis < 10) {
milliString = ".00" + millis;
} else if (millis < 100) {
milliString = ".0" + millis;
} else {
milliString = "." + millis;
}
while (milliString.length() > 0
&& milliString.charAt(milliString.length() - 1) == '0') {
milliString = milliString.substring(0, milliString.length() - 1);
}
dateTime = dateTime.substring(0, posDot) + milliString + "Z";
return dateTime;
}
/**
* Converts an instance of java.util.Date into a String using the date
* format: yyyy-MM-ddZ.
*
* @param date
* Instance of java.util.Date.
* @return Corresponding date string (returns null if Date argument is
* null).
*/
public static String convertDateToDateString(Date date) {
if (date == null) {
return null;
} else {
// DateFormat df = new SimpleDateFormat("yyyy-MM-dd'Z'");
DateTimeFormatter df = FORMATTER_DATE_Z;
return df.print(date.getTime());
}
}
/**
* Converts an instance of java.util.Date into a String using the date
* format: HH:mm:ss.SSSZ.
*
* @param date
* Instance of java.util.Date.
* @return Corresponding time string (returns null if Date argument is
* null).
*/
public static String convertDateToTimeString(Date date) {
if (date == null) {
return null;
} else {
// DateFormat df = new SimpleDateFormat("HH:mm:ss.SSS'Z'");
DateTimeFormatter df = FORMATTER_SECONDS_Z;
return df.print(date.getTime());
}
}
/**
* Convenience method for {@link #parseDateStrict(String)} which does not
* throw an exception on error, but merely returns null.
*
* @param dateString
* the date string to parse
* @return Date the date, if parse was successful; null otherwise
*/
public static Date parseDateLoose(String dateString) {
try {
return parseDateStrict(dateString);
} catch (ParseException e) {
return null;
}
}
/**
* Convenience method for {@link #parseDateStrict(String)} with the
* following difference: null or empty input returns null. Any other parse
* errors are wrapped as an IllegalArgumentException.
*
* @param dateString
* the date string to parse
* @return a Date representation of the dateString or null
* @throws IllegalArgumentException
* if dateString is unable to be parsed.
*/
public static Date parseDateOrNull(String dateString)
throws IllegalArgumentException {
if (dateString == null) {
return null;
} else if (dateString.isEmpty()) {
return null;
}
try {
return parseDateStrict(dateString);
} catch (ParseException e) {
throw new IllegalArgumentException(e.getMessage(), e);
}
}
/**
* Attempt to parse the given string of form: yyyy-MM-dd[THH:mm:ss[.SSS][Z]]
* as a Date.
*
* @param dateString
* the date string to parse
* @return a Date representation of the dateString
* @throws ParseException
* if dateString is null, empty or is otherwise unable to be
* parsed.
*/
public static Date parseDateStrict(String dateString) throws ParseException {
try {
if (dateString == null) {
throw new ParseException("Argument cannot be null.", 0);
}
final int last = dateString.length() - 1;
if (last == -1) {
throw new ParseException("Argument cannot be empty.", 0);
} else if (dateString.charAt(last) == '.') {
throw new ParseException(
"dateString ends with invalid character.",
last);
}
// SimpleDateFormat formatter = new SimpleDateFormat();
// formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
final int length = (dateString.charAt(0) != '-') ? last + 1 : last;
DateTimeFormatter formatter = FORMATTER_MILLISECONDS_T_Z;
if (dateString.charAt(last) == 'Z') {
if (length == 11) {
// formatter.applyPattern("yyyy-MM-dd'Z'");
formatter = FORMATTER_DATE_Z;
} else if (length == 20) {
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss'Z'");
formatter = FORMATTER_SECONDS_T_Z;
} else if (length > 21 && length < 24) {
// right-pad the milliseconds with 0s up to three places
int endIndex = last - 1;
int dotIndex = dateString.lastIndexOf('.');
int padding = 3 - (endIndex - dotIndex);
if (padding > 0) {
StringBuilder sb = new StringBuilder(24);
sb.append(dateString.subSequence(0, last));
switch(padding){
case 3:
sb.append('0');
case 2:
sb.append('0');
case 1:
sb.append('0');
}
sb.append('Z');
dateString = sb.toString();
}
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
formatter = FORMATTER_MILLISECONDS_T_Z;
} else if (length == 24) {
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
formatter = FORMATTER_MILLISECONDS_T_Z;
}
} else {
if (length == 10) {
// formatter.applyPattern("yyyy-MM-dd");
formatter = FORMATTER_DATE;
} else if (length == 19) {
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss");
formatter = FORMATTER_SECONDS_T;
} else if (length > 20 && length < 23) {
// right-pad millis with 0s
int endIndex = dateString.length() - 1;
int dotIndex = dateString.lastIndexOf('.');
int padding = 3 - (endIndex - dotIndex);
if (padding > 0) {
StringBuilder sb = new StringBuilder(23);
sb.append(dateString);
switch(padding){
case 3:
sb.append('0');
case 2:
sb.append('0');
case 1:
sb.append('0');
}
dateString = sb.toString();
}
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
formatter = FORMATTER_MILLISECONDS_T;
} else if (length == 23) {
// formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
formatter = FORMATTER_MILLISECONDS_T;
} else if (dateString.endsWith("GMT")
|| dateString.endsWith("UTC")) {
// formatter.applyPattern("EEE, dd MMMM yyyyy HH:mm:ss z");
// this has to be done by hand since Joda time can't parse
// the timezone
// see
// http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html
dateString = dateString.substring(0, last - 3);
formatter = FORMATTER_TIMEZONE;
}
}
DateTimeZone.setDefault(DateTimeZone.UTC);
DateTime dt = formatter.parseDateTime(dateString);
return dt.toDate();
} catch (IllegalArgumentException e) {
throw new ParseException(e.getLocalizedMessage(), 0);
}
}
public static String formatMillisTZ(Date date) {
return FORMATTER_MILLISECONDS_T_Z.print(date.getTime());
}
}