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/*
* $Id: FuncId.java,v 1.8 2010-11-01 04:35:08 joehw Exp $
*/
package com.sun.org.apache.xpath.internal.functions;
import java.util.StringTokenizer;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.utils.StringVector;
import com.sun.org.apache.xpath.internal.NodeSetDTM;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XNodeSet;
import com.sun.org.apache.xpath.internal.objects.XObject;
import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
/**
* Execute the Id() function.
* @xsl.usage advanced
*/
public class FuncId extends FunctionOneArg
{
static final long serialVersionUID = 8930573966143567310L;
/**
* Fill in a list with nodes that match a space delimited list if ID
* ID references.
*
* @param xctxt The runtime XPath context.
* @param docContext The document where the nodes are being looked for.
* @param refval A space delimited list of ID references.
* @param usedrefs List of references for which nodes were found.
* @param nodeSet Node set where the nodes will be added to.
* @param mayBeMore true if there is another set of nodes to be looked for.
*
* @return The usedrefs value.
*/
private StringVector getNodesByID(XPathContext xctxt, int docContext,
String refval, StringVector usedrefs,
NodeSetDTM nodeSet, boolean mayBeMore)
{
if (null != refval)
{
String ref = null;
// DOMHelper dh = xctxt.getDOMHelper();
StringTokenizer tokenizer = new StringTokenizer(refval);
boolean hasMore = tokenizer.hasMoreTokens();
DTM dtm = xctxt.getDTM(docContext);
while (hasMore)
{
ref = tokenizer.nextToken();
hasMore = tokenizer.hasMoreTokens();
if ((null != usedrefs) && usedrefs.contains(ref))
{
ref = null;
continue;
}
int node = dtm.getElementById(ref);
if (DTM.NULL != node)
nodeSet.addNodeInDocOrder(node, xctxt);
if ((null != ref) && (hasMore || mayBeMore))
{
if (null == usedrefs)
usedrefs = new StringVector();
usedrefs.addElement(ref);
}
}
}
return usedrefs;
}
/**
* 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
{
int context = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(context);
int docContext = dtm.getDocument();
if (DTM.NULL == docContext)
error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
XObject arg = m_arg0.execute(xctxt);
int argType = arg.getType();
XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
NodeSetDTM nodeSet = nodes.mutableNodeset();
if (XObject.CLASS_NODESET == argType)
{
DTMIterator ni = arg.iter();
StringVector usedrefs = null;
int pos = ni.nextNode();
while (DTM.NULL != pos)
{
DTM ndtm = ni.getDTM(pos);
String refval = ndtm.getStringValue(pos).toString();
pos = ni.nextNode();
usedrefs = getNodesByID(xctxt, docContext, refval, usedrefs, nodeSet,
DTM.NULL != pos);
}
// ni.detach();
}
else if (XObject.CLASS_NULL == argType)
{
return nodes;
}
else
{
String refval = arg.str();
getNodesByID(xctxt, docContext, refval, null, nodeSet, false);
}
return nodes;
}
}