/**
* 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.xxforms;
import org.orbeon.oxf.xforms.function.Index;
import org.orbeon.saxon.expr.Expression;
import org.orbeon.saxon.expr.XPathContext;
import org.orbeon.saxon.om.Item;
import org.orbeon.saxon.trans.XPathException;
/**
* xxf:index() function. Behaves like the standard XForms index() function, except the repeat id is optional. When
* it is not specified, the function returns the id of the closest enclosing repeat.
*/
public class XXFormsIndex extends Index {
public Item evaluateItem(XPathContext xpathContext) throws XPathException {
final Expression repeatIdExpression = (argument.length == 0) ? null : argument[0];
final String repeatId = (repeatIdExpression == null) ? null : repeatIdExpression.evaluateAsString(xpathContext).toString();
if (repeatId == null) {
// Find closest enclosing id
return findIndexForRepeatId(xpathContext, bindingContext().enclosingRepeatId());
} else {
return super.evaluateItem(xpathContext);
}
}
}