/**
* Get the value of a node as a string.
*
* @param n Node to be converted to a string. May be null.
* @return value of n as a string, or an empty string if n is null.
*/
public String toString(org.w3c.dom.Node n) {
// %REVIEW% You can't get much uglier than this...
int nodeHandle = getDTMHandleFromNode(n);
DTM dtm = getDTM(nodeHandle);
XMLString strVal = dtm.getStringValue(nodeHandle);
return strVal.toString();
}
/**
* Get the value of a node as a number.
*
* @param n Node to be converted to a number. May be null.
* @return value of n as a number.
*/
public double toNumber(org.w3c.dom.Node n) {
// %REVIEW% You can't get much uglier than this...
int nodeHandle = getDTMHandleFromNode(n);
DTM dtm = getDTM(nodeHandle);
XString xobj = (XString) dtm.getStringValue(nodeHandle);
return xobj.num();
}
/**
* Execute the first argument expression that is expected to return a string. If the argument is
* null, then get the string value from the current context node.
*
* @param xctxt Runtime XPath context.
* @return The string value of the first argument, or the string value of the current context node
* if the first argument is null.
* @throws javax.xml.transform.TransformerException if an error occurs while executing the
* argument expression.
*/
protected XMLString getArg0AsString(XPathContext xctxt)
throws javax.xml.transform.TransformerException {
if (null == m_arg0) {
int currentNode = xctxt.getCurrentNode();
if (DTM.NULL == currentNode) return XString.EMPTYSTRING;
else {
DTM dtm = xctxt.getDTM(currentNode);
return dtm.getStringValue(currentNode);
}
} else return m_arg0.execute(xctxt).xstr();
}
/**
* Execute the first argument expression that is expected to return a number. If the argument is
* null, then get the number value from the current context node.
*
* @param xctxt Runtime XPath context.
* @return The number value of the first argument, or the number value of the current context node
* if the first argument is null.
* @throws javax.xml.transform.TransformerException if an error occurs while executing the
* argument expression.
*/
protected double getArg0AsNumber(XPathContext xctxt)
throws javax.xml.transform.TransformerException {
if (null == m_arg0) {
int currentNode = xctxt.getCurrentNode();
if (DTM.NULL == currentNode) return 0;
else {
DTM dtm = xctxt.getDTM(currentNode);
XMLString str = dtm.getStringValue(currentNode);
return str.toDouble();
}
} else return m_arg0.execute(xctxt).num();
}
/**
* 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;
}
