http://nagoya.apache.org/bugzilla/show_bug.cgi?id=2307 *** shadow/2307 Mon Jun 25 06:53:04 2001 --- shadow/2307.tmp.25058 Mon Jun 25 06:53:04 2001 *************** *** 0 **** --- 1,95 ---- + +============================================================================+ + | An extension function cannot return a NodeIterator. | + +----------------------------------------------------------------------------+ + | Bug #: 2307 Product: XalanJ2 | + | Status: NEW Version: 2.1.0 | + | Resolution: Platform: Other | + | Severity: Normal OS/Version: All | + | Priority: Other Component: org.apache.xalan.extens | + +----------------------------------------------------------------------------+ + | Assigned To: [EMAIL PROTECTED] | + | Reported By: [EMAIL PROTECTED] | + | CC list: Cc: | + +----------------------------------------------------------------------------+ + | URL: | + +============================================================================+ + | DESCRIPTION | + Basically, you can't write an extension that returns + org.w3c.dom.traversal.NodeIterator. In the current version of the code, any + object that implements NodeIterator must also implement + org.apache.xpath.ContextNodeList. In the current CVS, the error message is + + javax.xml.transform.TransformerException: For extension function, could not + find method org.apache.xpath.NodeSetDTM.getNodeList([ExpressionContext,] ). + + Sample code: + + import org.w3c.dom.traversal.NodeIterator; + import org.w3c.dom.traversal.NodeFilter; + import org.w3c.dom.DOMException; + import org.w3c.dom.Node; + + import javax.xml.parsers.DocumentBuilderFactory; + import javax.xml.parsers.DocumentBuilder; + + public class Iterator implements NodeIterator { + private int mlngCount; + private org.w3c.dom.Document mobjDocument; + + public Iterator() throws javax.xml.parsers.ParserConfigurationException { + DocumentBuilderFactory objFactory = + DocumentBuilderFactory.newInstance(); + DocumentBuilder objBuilder = objFactory.newDocumentBuilder(); + mobjDocument = objBuilder.newDocument(); + } + + public NodeIterator getNodeList() { + return this; + } + + public Node getRoot() { + return mobjDocument; + } + + public int getWhatToShow() { + return NodeFilter.SHOW_ALL; + } + + public NodeFilter getFilter() { + return null; + } + + public boolean getExpandEntityReferences() { + return false; + } + + public Node nextNode() throws DOMException { + mlngCount++; + if (mlngCount<10) { + org.w3c.dom.Element objElement = mobjDocument.createElement("Hello"); + objElement.setAttribute("value", String.valueOf(mlngCount)); + return objElement; + } + return null; + } + + public Node previousNode() throws DOMException { + throw (new DOMException(DOMException.NOT_SUPPORTED_ERR, "This is a + custom iterator which cannot go back.")); + } + + public void detach() { + // Empty + } + } + + and I'm using the following file to test it: + + <?xml version="1.0"?> + <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; + xmlns:java="http://xml.apache.org/xslt/java"; + version="1.0"> + <xsl:template match="/"> + <xsl:for-each select="java:getNodeList(java:Iterator.new())" /> + </xsl:template> + </xsl:stylesheet> \ No newline at end of file
