package net.sf.saxon;
import net.sf.saxon.event.Builder;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.event.ReceivingContentHandler;
import net.sf.saxon.om.DocumentInfo;
import net.sf.saxon.trans.XPathException;
import org.xml.sax.SAXException;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.sax.TransformerHandler;
/**
* <b>TransformerHandlerImpl</b> implements the javax.xml.transform.sax.TransformerHandler
* interface. It acts as a ContentHandler and LexicalHandler which receives a stream of
* SAX events representing an input document, and performs a transformation treating this
* SAX stream as the source document of the transformation.
* @author Michael H. Kay
*/
public class TransformerHandlerImpl extends ReceivingContentHandler implements TransformerHandler {
// TODO: if requested, apply schema validation to the source document
Controller controller;
Builder builder;
Result result;
String systemId;
boolean started = false;
/**
* Create a TransformerHandlerImpl and initialise variables. The constructor is protected, because
* the Filter should be created using newTransformerHandler() in the SAXTransformerFactory
* class
*/
protected TransformerHandlerImpl(Controller controller) {
this.controller = controller;
setPipelineConfiguration(controller.makePipelineConfiguration());
builder = controller.makeBuilder();
builder.setPipelineConfiguration(getPipelineConfiguration());
Receiver stripper = controller.makeStripper(builder);
if (controller.getExecutable().stripsInputTypeAnnotations()) {
stripper = controller.getConfiguration().getAnnotationStripper(stripper);
}
this.setReceiver(stripper);
}
/**
* Start of a new document. The TransformerHandler is not serially reusable, so this method
* must only be called once.
* @throws SAXException only if an overriding subclass throws this exception
* @throws UnsupportedOperationException if an attempt is made to reuse the TransformerHandler by calling
* startDocument() more than once.
*/
public void startDocument () throws SAXException {
if (started) {
throw new UnsupportedOperationException(
"The TransformerHandler is not serially reusable. The startDocument() method must be called once only.");
}
started = true;
super.startDocument();
}
/**
* Get the Transformer used for this transformation
*/
public Transformer getTransformer() {
return controller;
}
/**
* Set the SystemId of the document
*/
public void setSystemId(String url) {
systemId = url;
builder.setSystemId(url);
}
/**
* Get the systemId of the document
*/
public String getSystemId() {
return systemId;
}
/**
* Set the output destination of the transformation
*/
public void setResult(Result result) {
if (result==null) {
throw new IllegalArgumentException("Result must not be null");
}
this.result = result;
}
/**
* Get the output destination of the transformation
*/
public Result getResult() {
return result;
}
/**
* Override the behaviour of endDocument() in ReceivingContentHandler, so that it fires off
* the transformation of the constructed document
*/
public void endDocument() throws SAXException {
super.endDocument();
DocumentInfo doc = (DocumentInfo)builder.getCurrentRoot();
if (doc==null) {
throw new SAXException("No source document has been built");
}
try {
controller.transformDocument(doc, result);
} catch (TransformerException err) {
if (err instanceof XPathException) {
controller.reportFatalError((XPathException)err);
}
throw new SAXException(err);
}
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (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.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): None
//
|