/*
* eXist Open Source Native XML Database
* Copyright (C) 2008-2010 The eXist Project
* http://exist-db.org
*
* 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.xslt.functions;
import org.exist.dom.NodeAtExist;
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.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.StringValue;
import org.exist.xquery.value.Type;
/**
* generate-id() as xs:string
* generate-id($node as node()?) as xs:string
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*
*/
public class Generate_id extends BasicFunction {
public final static FunctionSignature signatures[] = {
new FunctionSignature(new QName("generate-id", XSLModule.NAMESPACE_URI, XSLModule.PREFIX),
"The function returns a string that uniquely identifies a given node.", FunctionSignature.NO_ARGS, new SequenceType(Type.ITEM,
Cardinality.EXACTLY_ONE)),
new FunctionSignature(new QName("generate-id", XSLModule.NAMESPACE_URI, XSLModule.PREFIX),
"The function returns a string that uniquely identifies a given node.", new SequenceType[] { new SequenceType(Type.NODE,
Cardinality.ZERO_OR_ONE) }, new SequenceType(Type.ITEM, Cardinality.EXACTLY_ONE)) };
/**
* @param context
*/
public Generate_id(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
@Override
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
if (!contextSequence.isEmpty() && contextSequence.hasOne()) {
NodeAtExist docNode = (NodeAtExist) args[0].itemAt(0);
return new StringValue(docNode.getNodeId().toString());
}
return new StringValue("generate-id"); // XXX: error?
}
}