package org.exist.xquery.modules.datetime;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.DateTimeValue;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.TimeUtils;
import org.exist.xquery.value.Type;
/**
* @author Adam Retter <adam@exist-db.org>
*/
public class ParseDateTimeFunction extends BasicFunction
{
protected static final Logger logger = Logger.getLogger(FormatDateFunction.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("parse-dateTime", DateTimeModule.NAMESPACE_URI, DateTimeModule.PREFIX),
"Returns an xs:dateTime of the xs:string parsed according to the SimpleDateFormat format.",
new SequenceType[] {
new FunctionParameterSequenceType("dateTime-string", Type.STRING, Cardinality.EXACTLY_ONE, "The date and time to to be parsed."),
new FunctionParameterSequenceType("simple-date-format", Type.STRING, Cardinality.EXACTLY_ONE, "The format string according to the Java java.text.SimpleDateFormat class")
},
new FunctionReturnSequenceType(Type.DATE_TIME, Cardinality.EXACTLY_ONE, "the parsed xs:dateTime"));
public ParseDateTimeFunction(XQueryContext context)
{
super(context, signature);
}
@Override
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException
{
String strDateTime = args[0].itemAt(0).toString();
String dateFormat = args[1].itemAt(0).toString();
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
//ParsePosition pp = new ParsePosition(0);
try
{
Date date = sdf.parse(strDateTime);
GregorianCalendar cal = new GregorianCalendar();
cal.setTime(date);
return new DateTimeValue(TimeUtils.getInstance().newXMLGregorianCalendar(cal));
}
catch(ParseException pe)
{
throw new XPathException(this, "Could not parse dateTime string '" + strDateTime + "' for format '" + dateFormat + "': " + pe.getMessage(), pe);
}
}
}