Package org.exist.xquery.value

Source Code of org.exist.xquery.value.DateValue

/*
*  eXist Open Source Native XML Database
*  Copyright (C) 2001-06 Wolfgang M. Meier
*  wolfgang@exist-db.org
*  http://exist.sourceforge.net
*  This program 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 2
*  of the License, or (at your option) any later version.
*  This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*  $Id$
*/
package org.exist.xquery.value;

import java.util.GregorianCalendar;

import javax.xml.datatype.DatatypeConstants;
import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.namespace.QName;

import org.exist.xquery.ErrorCodes;
import org.exist.xquery.XPathException;

/**
* @author Wolfgang Meier (wolfgang@exist-db.org)
* @author <a href="mailto:piotr@ideanest.com">Piotr Kaminski</a>
*/
public class DateValue extends AbstractDateTimeValue {

  public DateValue() throws XPathException {
    super(stripCalendar(TimeUtils.getInstance().newXMLGregorianCalendar(new GregorianCalendar())));
  }

  public DateValue(String dateString) throws XPathException {
    super(dateString);
    try {
      if (calendar.getXMLSchemaType() != DatatypeConstants.DATE) {throw new IllegalStateException();}
    } catch (final IllegalStateException e) {
      throw new XPathException("xs:date must not have hour, minute or second fields set");
    }
  }
 
  public DateValue(XMLGregorianCalendar calendar) throws XPathException {
    super(stripCalendar(cloneXMLGregorianCalendar(calendar)));
  }
 
  private static XMLGregorianCalendar stripCalendar(XMLGregorianCalendar calendar) {
    calendar.setHour(DatatypeConstants.FIELD_UNDEFINED);
    calendar.setMinute(DatatypeConstants.FIELD_UNDEFINED);
    calendar.setSecond(DatatypeConstants.FIELD_UNDEFINED);
    calendar.setMillisecond(DatatypeConstants.FIELD_UNDEFINED);
    return calendar;
  }

  protected AbstractDateTimeValue createSameKind(XMLGregorianCalendar cal) throws XPathException {
    return new DateValue(cal);
  }

  protected QName getXMLSchemaType() {
    return DatatypeConstants.DATE;
  }

  public int getType() {
    return Type.DATE;
  }

  public AtomicValue convertTo(int requiredType) throws XPathException {
    switch (requiredType) {
      case Type.DATE :
      case Type.ATOMIC :
      case Type.ITEM :
                return this;
      case Type.DATE_TIME :
        return new DateTimeValue(calendar);
            case Type.GYEAR :
              return new GYearValue(this.calendar);
            case Type.GYEARMONTH :
                return new GYearMonthValue(calendar);
            case Type.GMONTHDAY :
                return new GMonthDayValue(calendar);
            case Type.GDAY :
                return new GDayValue(calendar);
            case Type.GMONTH :
                return new GMonthValue(calendar);
      case Type.UNTYPED_ATOMIC: {     
              final DateValue dv = new DateValue(getStringValue());
        return new UntypedAtomicValue(dv.getStringValue());   
      }
      case Type.STRING : {
              final DateValue dv = new DateValue(calendar);
        return new StringValue(dv.getStringValue());
      }
      default :
        throw new XPathException(ErrorCodes.FORG0001, "can not convert " +
            Type.getTypeName(getType()) + "('" + getStringValue() + "') to " +
            Type.getTypeName(requiredType));
    }
  }

  public ComputableValue minus(ComputableValue other) throws XPathException {
    switch (other.getType()) {
      case Type.DATE :
        return new DayTimeDurationValue(getTimeInMillis() - ((DateValue) other).getTimeInMillis());
      case Type.YEAR_MONTH_DURATION :
        return ((YearMonthDurationValue) other).negate().plus(this);
      case Type.DAY_TIME_DURATION :
        return ((DayTimeDurationValue) other).negate().plus(this);
      default :
        throw new XPathException(
          "Operand to minus should be of type xdt:yearMonthDuration or xdt:dayTimeDuration; got: "
            + Type.getTypeName(other.getType()));
    }
  }
}
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