/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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: XSLProcessorContext.java,v 1.19 2005/01/23 00:10:05 mcnamara Exp $
*/
package org.apache.xalan.extensions;
import javax.xml.transform.TransformerException;
import org.apache.xalan.templates.Stylesheet;
import org.apache.xalan.transformer.ClonerToResultTree;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMAxisIterator;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xalan.serialize.SerializerUtils;
import org.apache.xml.serializer.SerializationHandler;
import org.apache.xml.utils.QName;
import org.apache.xpath.XPathContext;
import org.apache.xpath.axes.DescendantIterator;
import org.apache.xpath.axes.OneStepIterator;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XNodeSet;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.objects.XRTreeFrag;
import org.apache.xpath.objects.XString;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.traversal.NodeIterator;
// import org.apache.xalan.xslt.*;
/**
* Provides transformer context to be passed to an extension element.
*
* @author Sanjiva Weerawarana (sanjiva@watson.ibm.com)
* @xsl.usage general
*/
public class XSLProcessorContext
{
/**
* Create a processor context to be passed to an extension.
* (Notice it is a package-only constructor).
*
* @param transformer non-null transformer instance
* @param stylesheetTree The owning stylesheet
*/
public XSLProcessorContext(TransformerImpl transformer,
Stylesheet stylesheetTree)
{
this.transformer = transformer;
this.stylesheetTree = stylesheetTree;
// %TBD%
org.apache.xpath.XPathContext xctxt = transformer.getXPathContext();
this.mode = transformer.getMode();
this.sourceNode = xctxt.getCurrentNode();
this.sourceTree = xctxt.getDTM(this.sourceNode);
}
/** An instance of a transformer */
private TransformerImpl transformer;
/**
* Get the transformer.
*
* @return the transformer instance for this context
*/
public TransformerImpl getTransformer()
{
return transformer;
}
/** The owning stylesheet for this context */
private Stylesheet stylesheetTree;
/**
* Get the Stylesheet being executed.
*
* @return the Stylesheet being executed.
*/
public Stylesheet getStylesheet()
{
return stylesheetTree;
}
/** The root of the source tree being executed. */
private org.apache.xml.dtm.DTM sourceTree;
/**
* Get the root of the source tree being executed.
*
* @return the root of the source tree being executed.
*/
public org.w3c.dom.Node getSourceTree()
{
return sourceTree.getNode(sourceTree.getDocumentRoot(sourceNode));
}
/** the current context node. */
private int sourceNode;
/**
* Get the current context node.
*
* @return the current context node.
*/
public org.w3c.dom.Node getContextNode()
{
return sourceTree.getNode(sourceNode);
}
/** the current mode being executed. */
private QName mode;
/**
* Get the current mode being executed.
*
* @return the current mode being executed.
*/
public QName getMode()
{
return mode;
}
/**
* Output an object to the result tree by doing the right conversions.
* This is public for access by extensions.
*
*
* @param stylesheetTree The owning stylesheet
* @param obj the Java object to output. If its of an X<something> type
* then that conversion is done first and then sent out.
*
* @throws javax.xml.transform.TransformerException
* @throws java.io.FileNotFoundException
* @throws java.io.IOException
* @throws java.net.MalformedURLException
*/
public void outputToResultTree(Stylesheet stylesheetTree, Object obj)
throws TransformerException, java.net.MalformedURLException,
java.io.FileNotFoundException, java.io.IOException
{
try
{
SerializationHandler rtreeHandler = transformer.getResultTreeHandler();
XPathContext xctxt = transformer.getXPathContext();
XObject value;
// Make the return object into an XObject because it
// will be easier below. One of the reasons to do this
// is to keep all the conversion functionality in the
// XObject classes.
if (obj instanceof XObject)
{
value = (XObject) obj;
}
else if (obj instanceof String)
{
value = new XString((String) obj);
}
else if (obj instanceof Boolean)
{
value = new XBoolean(((Boolean) obj).booleanValue());
}
else if (obj instanceof Double)
{
value = new XNumber(((Double) obj).doubleValue());
}
else if (obj instanceof DocumentFragment)
{
int handle = xctxt.getDTMHandleFromNode((DocumentFragment)obj);
value = new XRTreeFrag(handle, xctxt);
}
else if (obj instanceof DTM)
{
DTM dtm = (DTM)obj;
DTMIterator iterator = new DescendantIterator();
// %%ISSUE%% getDocument may not be valid for DTMs shared by multiple
// document trees, eg RTFs. But in that case, we shouldn't be trying
// to iterate over the whole DTM; we should be iterating over
// dtm.getDocumentRoot(rootNodeHandle), and folks should have told us
// this by passing a more appropriate type.
iterator.setRoot(dtm.getDocument(), xctxt);
value = new XNodeSet(iterator);
}
else if (obj instanceof DTMAxisIterator)
{
DTMAxisIterator iter = (DTMAxisIterator)obj;
DTMIterator iterator = new OneStepIterator(iter, -1);
value = new XNodeSet(iterator);
}
else if (obj instanceof DTMIterator)
{
value = new XNodeSet((DTMIterator) obj);
}
else if (obj instanceof NodeIterator)
{
value = new XNodeSet(new org.apache.xpath.NodeSetDTM(((NodeIterator)obj), xctxt));
}
else if (obj instanceof org.w3c.dom.Node)
{
value =
new XNodeSet(xctxt.getDTMHandleFromNode((org.w3c.dom.Node) obj),
xctxt.getDTMManager());
}
else
{
value = new XString(obj.toString());
}
int type = value.getType();
String s;
switch (type)
{
case XObject.CLASS_BOOLEAN :
case XObject.CLASS_NUMBER :
case XObject.CLASS_STRING :
s = value.str();
rtreeHandler.characters(s.toCharArray(), 0, s.length());
break;
case XObject.CLASS_NODESET : // System.out.println(value);
DTMIterator nl = value.iter();
int pos;
while (DTM.NULL != (pos = nl.nextNode()))
{
DTM dtm = nl.getDTM(pos);
int top = pos;
while (DTM.NULL != pos)
{
rtreeHandler.flushPending();
ClonerToResultTree.cloneToResultTree(pos, dtm.getNodeType(pos),
dtm, rtreeHandler, true);
int nextNode = dtm.getFirstChild(pos);
while (DTM.NULL == nextNode)
{
if (DTM.ELEMENT_NODE == dtm.getNodeType(pos))
{
rtreeHandler.endElement("", "", dtm.getNodeName(pos));
}
if (top == pos)
break;
nextNode = dtm.getNextSibling(pos);
if (DTM.NULL == nextNode)
{
pos = dtm.getParent(pos);
if (top == pos)
{
if (DTM.ELEMENT_NODE == dtm.getNodeType(pos))
{
rtreeHandler.endElement("", "", dtm.getNodeName(pos));
}
nextNode = DTM.NULL;
break;
}
}
}
pos = nextNode;
}
}
break;
case XObject.CLASS_RTREEFRAG :
SerializerUtils.outputResultTreeFragment(
rtreeHandler, value, transformer.getXPathContext());
// rtreeHandler.outputResultTreeFragment(value,
// transformer.getXPathContext());
break;
}
}
catch(org.xml.sax.SAXException se)
{
throw new TransformerException(se);
}
}
/**
* I need a "Node transformNode (Node)" method somewhere that the
* user can call to process the transformation of a node but not
* serialize out automatically. ????????????????
*
* Does ElemTemplateElement.executeChildTemplates() cut it? It sends
* results out to the stream directly, so that could be a problem.
*/
}