Date objects returned are not, but
* these objects are cloned before being returned.
*
* @since 1.0
* @author Steve Hanna
*/
public class DayTimeDurationAttribute extends AttributeValue
{
/**
* Official name of this type
*/
public static final String identifier =
"http://www.w3.org/TR/2002/WD-xquery-operators-20020816#" +
"dayTimeDuration";
/**
* URI version of name for this type
*
* This field is initialized by a static initializer so that
* we can catch any exceptions thrown by URI(String) and
* transform them into a RuntimeException, since this should
* never happen but should be reported properly if it ever does.
*/
private static URI identifierURI;
/**
* RuntimeException that wraps an Exception thrown during the
* creation of identifierURI, null if none.
*/
private static RuntimeException earlyException;
/**
* Static initializer that initializes the identifierURI
* class field so that we can catch any exceptions thrown
* by URI(String) and transform them into a RuntimeException.
* Such exceptions should never happen but should be reported
* properly if they ever do.
*/
static {
try {
identifierURI = new URI(identifier);
} catch (Exception e) {
earlyException = new IllegalArgumentException();
earlyException.initCause(e);
}
};
/**
* Regular expression for dayTimeDuration (a la java.util.regex)
*/
private static final String patternString =
"(\\-)?P((\\d+)?D)?(T((\\d+)?H)?((\\d+)?M)?((\\d+)?(.(\\d+)?)?S)?)?";
/**
* The index of the capturing group for the negative sign.
*/
private static final int GROUP_SIGN = 1;
/**
* The index of the capturing group for the number of days.
*/
private static final int GROUP_DAYS = 3;
/**
* The index of the capturing group for the number of hours.
*/
private static final int GROUP_HOURS = 6;
/**
* The index of the capturing group for the number of minutes.
*/
private static final int GROUP_MINUTES = 8;
/**
* The index of the capturing group for the number of seconds.
*/
private static final int GROUP_SECONDS = 10;
/**
* The index of the capturing group for the number of nanoseconds.
*/
private static final int GROUP_NANOSECONDS = 12;
/**
* Static BigInteger values. We only use these if one of
* the components is bigger than Integer.MAX_LONG and we
* want to detect overflow, so we don't initialize these
* until they're needed.
*/
private static BigInteger big24;
private static BigInteger big60;
private static BigInteger big1000;
private static BigInteger bigMaxLong;
/**
* A shared Pattern object, only initialized if needed
*/
private static Pattern pattern;
/**
* Negative flag. true if duration is negative, false otherwise
*/
private boolean negative;
/**
* Number of days
*/
private long days;
/**
* Number of hours
*/
private long hours;
/**
* Number of minutes
*/
private long minutes;
/**
* Number of seconds
*/
private long seconds;
/**
* Number of nanoseconds
*/
private int nanoseconds;
/**
* Total number of round seconds (in milliseconds)
*/
private long totalMillis;
/**
* Cached encoded value (null if not cached yet).
*/
private String encodedValue = null;
/**
* Creates a new DayTimeDurationAttribute that represents
* the duration supplied.
*
* @param negative true if the duration is negative, false otherwise
* @param days the number of days in the duration
* @param hours the number of hours in the duration
* @param minutes the number of minutes in the duration
* @param seconds the number of seconds in the duration
* @param nanoseconds the number of nanoseconds in the duration
* @throws IllegalArgumentException if the total number of milliseconds
* exceeds Long.MAX_LONG
*/
public DayTimeDurationAttribute(boolean negative, long days, long hours,
long minutes, long seconds,
int nanoseconds)
throws IllegalArgumentException {
super(identifierURI);
// Shouldn't happen, but just in case...
if (earlyException != null)
throw earlyException;
this.negative = negative;
this.days = days;
this.hours = hours;
this.minutes = minutes;
this.seconds = seconds;
this.nanoseconds = nanoseconds;
// Convert all the components except nanoseconds to milliseconds
// If any of the components is big (too big to be an int),
// use the BigInteger class to do the math so we can detect
// overflow.
if ((days > Integer.MAX_VALUE) || (hours > Integer.MAX_VALUE) ||
(minutes > Integer.MAX_VALUE) || (seconds > Integer.MAX_VALUE)) {
if (big24 == null) {
big24 = BigInteger.valueOf(24);
big60 = BigInteger.valueOf(60);
big1000 = BigInteger.valueOf(1000);
bigMaxLong = BigInteger.valueOf(Long.MAX_VALUE);
}
BigInteger bigDays = BigInteger.valueOf(days);
BigInteger bigHours = BigInteger.valueOf(hours);
BigInteger bigMinutes = BigInteger.valueOf(minutes);
BigInteger bigSeconds = BigInteger.valueOf(seconds);
BigInteger bigTotal = bigDays.multiply(big24).add(bigHours)
.multiply(big60).add(bigMinutes).multiply(big60)
.add(bigSeconds).multiply(big1000);
// If the result is bigger than Long.MAX_VALUE, we have an
// overflow. Indicate an error (should be a processing error,
// since it can be argued that we should handle gigantic
// values for this).
if (bigTotal.compareTo(bigMaxLong) == 1)
throw new IllegalArgumentException("total number of " +
"milliseconds " +
"exceeds Long.MAX_VALUE");
// If no overflow, convert to a long.
totalMillis = bigTotal.longValue();
} else {
// The numbers are small, so do it the fast way.
totalMillis = ((((((days * 24) + hours) * 60) + minutes) * 60) +
seconds) * 1000;
}
}
/**
* Returns a new DayTimeDurationAttribute that represents
* the xf:dayTimeDuration at a particular DOM node.
*
* @param root the Node that contains the desired value
* @return a new DayTimeDurationAttribute representing the
* appropriate value (null if there is a parsing error)
*/
public static DayTimeDurationAttribute getInstance(Node root)
throws ParsingException, NumberFormatException
{
return getInstance(root.getFirstChild().getNodeValue());
}
/**
* Returns the long value for the capturing group groupNumber.
* This method takes a Matcher that has been used to match a
* Pattern against a String, fetches the value for the specified
* capturing group, converts that value to an long, and returns
* the value. If that group did not match, 0 is returned.
* If the matched value is not a valid long, NumberFormatException
* is thrown.
*
* @param matcher the Matcher from which to fetch the group
* @param groupNumber the group number to fetch
* @return the long value for that groupNumber
* @throws NumberFormatException if the string value for that
* groupNumber is not a valid long
*/
private static long parseGroup(Matcher matcher, int groupNumber)
throws NumberFormatException {
long groupLong = 0;
if (matcher.start(groupNumber) != -1) {
String groupString = matcher.group(groupNumber);
groupLong = Long.parseLong(groupString);
}
return groupLong;
}
/**
* Returns a new DayTimeDurationAttribute that represents
* the xf:dayTimeDuration value indicated by the string provided.
*
* @param value a string representing the desired value
* @return a new DayTimeDurationAttribute representing the
* desired value (null if there is a parsing error)
*/
public static DayTimeDurationAttribute getInstance(String value)
throws ParsingException, NumberFormatException
{
boolean negative = false;
long days = 0;
long hours = 0;
long minutes = 0;
long seconds = 0;
int nanoseconds = 0;
// Compile the pattern, if not already done.
// No thread-safety problem here. The worst that can
// happen is that we initialize pattern several times.
if (pattern == null) {
try {
pattern = Pattern.compile(patternString);
} catch (PatternSyntaxException e) {
// This should never happen
throw new ParsingException("unexpected pattern match error");
}
}
// See if the value matches the pattern.
Matcher matcher = pattern.matcher(value);
boolean matches = matcher.matches();
// If not, syntax error!
if (!matches) {
throw new ParsingException("Syntax error in dayTimeDuration");
}
// If the negative group matched, the value is negative.
if (matcher.start(GROUP_SIGN) != -1)
negative = true;
try {
// If the days group matched, parse that value.
days = parseGroup(matcher, GROUP_DAYS);
// If the hours group matched, parse that value.
hours = parseGroup(matcher, GROUP_HOURS);
// If the minutes group matched, parse that value.
minutes = parseGroup(matcher, GROUP_MINUTES);
// If the seconds group matched, parse that value.
seconds = parseGroup(matcher, GROUP_SECONDS);
// Special handling for fractional seconds, since
// they can have any resolution.
if (matcher.start(GROUP_NANOSECONDS) != -1) {
String nanosecondString = matcher.group(GROUP_NANOSECONDS);
// If there are less than 9 digits in the fractional seconds,
// pad with zeros on the right so it's nanoseconds.
while (nanosecondString.length() < 9)
nanosecondString += "0";
// If there are more than 9 digits in the fractional seconds,
// drop the least significant digits.
if (nanosecondString.length() > 9) {
nanosecondString = nanosecondString.substring(0, 9);
}
nanoseconds = Integer.parseInt(nanosecondString);
}
} catch (NumberFormatException e) {
// If we run into a number that's too big to be a long
// that's an error. Really, it's a processing error,
// since one can argue that we should handle that.
throw e;
}
// Here's a requirement that's not checked for in the pattern.
// The designator 'T' must be absent if all the time
// items are absent. So the string can't end in 'T'.
// Note that we don't have to worry about a zero length
// string, since the pattern won't allow that.
if (value.charAt(value.length()-1) == 'T')
throw new ParsingException("'T' must be absent if all" +
"time items are absent");
// If parsing went OK, create a new DayTimeDurationAttribute object and
// return it.
return new DayTimeDurationAttribute(negative, days, hours, minutes,
seconds, nanoseconds);
}
/**
* Returns true if the duration is negative.
*
* @return true if the duration is negative, false otherwise
*/
public boolean isNegative() {
return negative;
}
/**
* Gets the number of days.
*
* @return the number of days
*/
public long getDays() {
return days;
}
/**
* Gets the number of hours.
*
* @return the number of hours
*/
public long getHours() {
return hours;
}
/**
* Gets the number of minutes.
*
* @return the number of minutes
*/
public long getMinutes() {
return minutes;
}
/**
* Gets the number of seconds.
*
* @return the number of seconds
*/
public long getSeconds() {
return seconds;
}
/**
* Gets the number of nanoseconds.
*
* @return the number of nanoseconds
*/
public int getNanoseconds() {
return nanoseconds;
}
/**
* Gets the total number of round seconds (in milliseconds).
*
* @return the total number of seconds (in milliseconds)
*/
public long getTotalSeconds() {
return totalMillis;
}
/**
* Returns true if the input is an instance of this class and if its
* value equals the value contained in this class.
*
* @param o the object to compare
*
* @return true if this object and the input represent the same value
*/
public boolean equals(Object o) {
if (! (o instanceof DayTimeDurationAttribute))
return false;
DayTimeDurationAttribute other = (DayTimeDurationAttribute)o;
return ((totalMillis == other.totalMillis) &&
(nanoseconds == other.nanoseconds) &&
(negative == other.negative));
}
/**
* Returns the hashcode value used to index and compare this object with
* others of the same type. Typically this is the hashcode of the backing
* data object.
*
* @return the object's hashcode value
*/
public int hashCode() {
// The totalMillis, nanoseconds, and negative fields are all considered
// by the equals method, so it's best if the hashCode is derived
// from all of those fields.
int hashCode = (int) totalMillis ^ (int) (totalMillis >> 32);
hashCode = 31*hashCode + nanoseconds;
if (negative)
hashCode = -hashCode;
return hashCode;
}
/**
* Converts to a String representation.
*
* @return the String representation
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("DayTimeDurationAttribute: [\n");
sb.append(" Negative: " + negative);
sb.append(" Days: " + days);
sb.append(" Hours: " + hours);
sb.append(" Minutes: " + minutes);
sb.append(" Seconds: " + seconds);
sb.append(" Nanoseconds: " + nanoseconds);
sb.append(" TotalSeconds: " + totalMillis);
sb.append("]");
return sb.toString();
}
/**
* Encodes the value in a form suitable for including in XML data like
* a request or an obligation. This must return a value that could in
* turn be used by the factory to create a new instance with the same
* value.
*
* @return a String form of the value
*/
public String encode() {
if (encodedValue != null)
return encodedValue;
// Length is quite variable
StringBuffer buf = new StringBuffer(10);
if (negative)
buf.append('-');
buf.append('P');
if (days != 0) {
buf.append(Long.toString(days));
buf.append('D');
}
if ((hours != 0) || (minutes != 0)
|| (seconds != 0) || (nanoseconds != 0)) {
// Only include the T if there are some time fields
buf.append('T');
} else {
// Make sure that there's always at least one field specified
if (days == 0)
buf.append("0D");
}
if (hours != 0) {
buf.append(Long.toString(hours));
buf.append('H');
}
if (minutes != 0) {
buf.append(Long.toString(minutes));
buf.append('M');
}
if ((seconds != 0) || (nanoseconds != 0)) {
buf.append(Long.toString(seconds));
if (nanoseconds != 0) {
buf.append('.');
buf.append(DateAttribute.zeroPadInt(nanoseconds, 9));
}
buf.append('S');
}
encodedValue = buf.toString();
return encodedValue;
}
}