/**
* Copyright (C) 2010 Orbeon, Inc.
*
* 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
* 2.1 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.
*
* The full text of the license is available at http://www.gnu.org/copyleft/lesser.html
*/
package org.orbeon.oxf.xforms.function;
import org.orbeon.saxon.expr.XPathContext;
import org.orbeon.saxon.om.Item;
import org.orbeon.saxon.trans.XPathException;
import org.orbeon.saxon.value.DateTimeValue;
import org.orbeon.saxon.value.DecimalValue;
import org.orbeon.saxon.value.StringValue;
import java.math.BigDecimal;
public class SecondsFromDateTime extends XFormsFunction {
public static final StringValue NAN = new StringValue("NaN");
public static final BigDecimal BASELINE = DateTimeValue.javaOrigin.toJulianInstant();
public Item evaluateItem(XPathContext context) throws XPathException {
final String arg = argument[0].evaluateAsString(context).toString();
try {
final DateTimeValue value = (DateTimeValue) DateTimeValue.makeDateTimeValue(arg).asAtomic();
// "the return value is equal to the number of seconds difference between the specified dateTime
// (normalized to UTC) and 1970-01-01T00:00:00Z"
return new DecimalValue(value.normalize(context).toJulianInstant().subtract(BASELINE));
} catch (XPathException e) {
return NAN;
}
}
}