/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: FuncKey.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import java.util.Hashtable;
import org.apache.xalan.transformer.KeyManager;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.utils.QName;
import org.apache.xml.utils.XMLString;
import org.apache.xpath.XPathContext;
import org.apache.xpath.axes.UnionPathIterator;
import org.apache.xpath.functions.Function2Args;
import org.apache.xpath.objects.XNodeSet;
import org.apache.xpath.objects.XObject;
/**
* Execute the Key() function.
* @xsl.usage advanced
*/
public class FuncKey extends Function2Args
{
static final long serialVersionUID = 9089293100115347340L;
/** Dummy value to be used in usedrefs hashtable */
static private Boolean ISTRUE = new Boolean(true);
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
// TransformerImpl transformer = (TransformerImpl)xctxt;
TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
XNodeSet nodes = null;
int context = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(context);
int docContext = dtm.getDocumentRoot(context);
if (DTM.NULL == docContext)
{
// path.error(context, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC); //"context does not have an owner document!");
}
String xkeyname = getArg0().execute(xctxt).str();
QName keyname = new QName(xkeyname, xctxt.getNamespaceContext());
XObject arg = getArg1().execute(xctxt);
boolean argIsNodeSetDTM = (XObject.CLASS_NODESET == arg.getType());
KeyManager kmgr = transformer.getKeyManager();
// Don't bother with nodeset logic if the thing is only one node.
if(argIsNodeSetDTM)
{
XNodeSet ns = (XNodeSet)arg;
ns.setShouldCacheNodes(true);
int len = ns.getLength();
if(len <= 1)
argIsNodeSetDTM = false;
}
if (argIsNodeSetDTM)
{
Hashtable usedrefs = null;
DTMIterator ni = arg.iter();
int pos;
UnionPathIterator upi = new UnionPathIterator();
upi.exprSetParent(this);
while (DTM.NULL != (pos = ni.nextNode()))
{
dtm = xctxt.getDTM(pos);
XMLString ref = dtm.getStringValue(pos);
if (null == ref)
continue;
if (null == usedrefs)
usedrefs = new Hashtable();
if (usedrefs.get(ref) != null)
{
continue; // We already have 'em.
}
else
{
// ISTRUE being used as a dummy value.
usedrefs.put(ref, ISTRUE);
}
XNodeSet nl =
kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname, ref,
xctxt.getNamespaceContext());
nl.setRoot(xctxt.getCurrentNode(), xctxt);
// try
// {
upi.addIterator(nl);
// }
// catch(CloneNotSupportedException cnse)
// {
// // will never happen.
// }
//mnodeset.addNodesInDocOrder(nl, xctxt); needed??
}
int current = xctxt.getCurrentNode();
upi.setRoot(current, xctxt);
nodes = new XNodeSet(upi);
}
else
{
XMLString ref = arg.xstr();
nodes = kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname,
ref,
xctxt.getNamespaceContext());
nodes.setRoot(xctxt.getCurrentNode(), xctxt);
}
return nodes;
}
}