transformerimpl.java

java1.6众多例子参考

	_tohFactory = TransletOutputHandlerFactory.newInstance();
	_tohFactory.setEncoding(_encoding);
	if (_method != null) {
	    _tohFactory.setOutputMethod(_method);
	}

	// Set indentation number in the factory
	if (_indentNumber >= 0) {
	    _tohFactory.setIndentNumber(_indentNumber);
	}

	// Return the content handler for this Result object
	try {
	    // Result object could be SAXResult, DOMResult, or StreamResult 
	    if (result instanceof SAXResult) {
                final SAXResult target = (SAXResult)result;
                final ContentHandler handler = target.getHandler();

		_tohFactory.setHandler(handler);

                /**
                 * Fix for bug 24414
                 * If the lexicalHandler is set then we need to get that
                 * for obtaining the lexical information 
                 */
                LexicalHandler lexicalHandler = target.getLexicalHandler();

                if (lexicalHandler != null ) {
		    _tohFactory.setLexicalHandler(lexicalHandler);
		}

		_tohFactory.setOutputType(TransletOutputHandlerFactory.SAX);
		return _tohFactory.getSerializationHandler();
            }
            else if (result instanceof StAXResult) {
                if (((StAXResult) result).getXMLEventWriter() != null) 
                    _tohFactory.setXMLEventWriter(((StAXResult) result).getXMLEventWriter());
                else if (((StAXResult) result).getXMLStreamWriter() != null) 
                    _tohFactory.setXMLStreamWriter(((StAXResult) result).getXMLStreamWriter());
                _tohFactory.setOutputType(TransletOutputHandlerFactory.STAX);
                return _tohFactory.getSerializationHandler();
            }
	    else if (result instanceof DOMResult) {
		_tohFactory.setNode(((DOMResult) result).getNode());
		_tohFactory.setNextSibling(((DOMResult) result).getNextSibling());
		_tohFactory.setOutputType(TransletOutputHandlerFactory.DOM);
		return _tohFactory.getSerializationHandler();
            }
	    else if (result instanceof StreamResult) {
		// Get StreamResult
		final StreamResult target = (StreamResult) result;	

		// StreamResult may have been created with a java.io.File,
		// java.io.Writer, java.io.OutputStream or just a String
		// systemId. 

		_tohFactory.setOutputType(TransletOutputHandlerFactory.STREAM);

		// try to get a Writer from Result object
		final Writer writer = target.getWriter();
		if (writer != null) {
		    _tohFactory.setWriter(writer);
		    return _tohFactory.getSerializationHandler();
		}

		// or try to get an OutputStream from Result object
		final OutputStream ostream = target.getOutputStream();
		if (ostream != null) {
		    _tohFactory.setOutputStream(ostream);
		    return _tohFactory.getSerializationHandler();
		}

		// or try to get just a systemId string from Result object
		String systemId = result.getSystemId();
		if (systemId == null) {
		    ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_NO_RESULT_ERR);
                    throw new TransformerException(err.toString());
		}

		// System Id may be in one of several forms, (1) a uri
		// that starts with 'file:', (2) uri that starts with 'http:'
		// or (3) just a filename on the local system.
		URL url = null;
                if (systemId.startsWith("file:")) {
                    // if StreamResult(File) or setSystemID(File) was used,
                    // the systemId will be URI encoded as a result of File.toURI(),
                    // it must be decoded for use by URL
                    try{
                        Class clazz =   ObjectFactory.findProviderClass("java.net.URI", ObjectFactory.findClassLoader(), true);
                        Constructor  construct   = clazz.getConstructor(new Class[] {java.lang.String.class} );
                        URI uri = (URI) construct.newInstance(new Object[]{systemId}) ;
                        systemId = "file:";

                        String host = uri.getHost(); // decoded String
                        String path = uri.getPath(); //decoded String
                        if (path == null) {
                         path = "";   
                        }

                        // if host (URI authority) then file:// + host + path
                        // else just path (may be absolute or relative)
                        if (host != null) {
                         systemId += "//" + host + path;   
                        } else {
                         systemId += "//" + path;   
                        }
                    }
                    catch(ClassNotFoundException e){
                        // running on J2SE 1.3 which doesn't have URI Class so OK to ignore
                        //ClassNotFoundException.
                    }
                    catch (Exception  exception) {
                        // URI exception which means nothing can be done so OK to ignore
                    }
                        
                    url = new URL(systemId);
                    _ostream = new FileOutputStream(url.getFile());
		    _tohFactory.setOutputStream(_ostream);
		    return _tohFactory.getSerializationHandler();
                }
                else if (systemId.startsWith("http:")) {
                    url = new URL(systemId);
                    final URLConnection connection = url.openConnection();
		    _tohFactory.setOutputStream(_ostream = connection.getOutputStream());
		    return _tohFactory.getSerializationHandler();
                }
                else {
                    // system id is just a filename
                    url = new File(systemId).toURL();
		    _tohFactory.setOutputStream(
		        _ostream = new FileOutputStream(url.getFile()));
		    return _tohFactory.getSerializationHandler();
                }
	    }
	}
        // If we cannot write to the location specified by the SystemId
        catch (UnknownServiceException e) {
            throw new TransformerException(e);
        }
        catch (ParserConfigurationException e) {
            throw new TransformerException(e);
        }
        // If we cannot create the file specified by the SystemId
        catch (IOException e) {
            throw new TransformerException(e);
        }
	return null;
    }

    /**
     * Set the internal DOM that will be used for the next transformation
     */
    protected void setDOM(DOM dom) {
	_dom = dom;
    }

    /**
     * Builds an internal DOM from a TrAX Source object
     */
    private DOM getDOM(Source source) throws TransformerException {
        try {
            DOM dom = null;

            if (source != null) {
                DTMWSFilter wsfilter;
                if (_translet != null && _translet instanceof StripFilter) {
                    wsfilter = new DOMWSFilter(_translet);
                 } else {
                    wsfilter = null;
                 }
            
                 boolean hasIdCall = (_translet != null) ? _translet.hasIdCall()
                                                         : false;

                 if (_dtmManager == null) {
                     _dtmManager =
                         (XSLTCDTMManager)_tfactory.getDTMManagerClass()
                                                   .newInstance();
                 }
                 dom = (DOM)_dtmManager.getDTM(source, false, wsfilter, true,
                                              false, false, 0, hasIdCall);
            } else if (_dom != null) {
                 dom = _dom;
                 _dom = null;  // use only once, so reset to 'null'
            } else {
                 return null;
            }

            if (!_isIdentity) {
                // Give the translet the opportunity to make a prepass of
                // the document, in case it can extract useful information early
                _translet.prepassDocument(dom);
            }

            return dom;

        }
        catch (Exception e) {
            if (_errorListener != null) {
                postErrorToListener(e.getMessage());
            }
            throw new TransformerException(e);
        }
    }
 
    /**
     * Returns the {@link com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl}
     * object that create this <code>Transformer</code>.
     */
    protected TransformerFactoryImpl getTransformerFactory() {
        return _tfactory;
    }
    
    /**
     * Returns the {@link com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory}
     * object that create the <code>TransletOutputHandler</code>.
     */
    protected TransletOutputHandlerFactory getTransletOutputHandlerFactory() {
        return _tohFactory;
    }

    private void transformIdentity(Source source, SerializationHandler handler)
	throws Exception 
    {
        // Get systemId from source
        if (source != null) {
            _sourceSystemId = source.getSystemId();
        }

        if (source instanceof StreamSource) {
            final StreamSource stream = (StreamSource) source;
            final InputStream streamInput = stream.getInputStream();
            final Reader streamReader = stream.getReader();
            final XMLReader reader = _readerManager.getXMLReader();

            try {
                // Hook up reader and output handler
                try {
                    reader.setProperty(LEXICAL_HANDLER_PROPERTY, handler);
                    reader.setFeature(NAMESPACE_PREFIXES_FEATURE, true);
                } catch (SAXException e) {
                    // Falls through
                }
                reader.setContentHandler(handler);

                // Create input source from source
                InputSource input;
                if (streamInput != null) {
                    input = new InputSource(streamInput);
                    input.setSystemId(_sourceSystemId); 
                } 
                else if (streamReader != null) {
                    input = new InputSource(streamReader);
                    input.setSystemId(_sourceSystemId); 
                } 
                else if (_sourceSystemId != null) {
                    input = new InputSource(_sourceSystemId);
                } 
                else {
                    ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_NO_SOURCE_ERR);
                    throw new TransformerException(err.toString());
                }

                // Start pushing SAX events
                reader.parse(input);
            } finally {
                _readerManager.releaseXMLReader(reader);
            }
        } else if (source instanceof SAXSource) {
            final SAXSource sax = (SAXSource) source;
            XMLReader reader = sax.getXMLReader();
            final InputSource input = sax.getInputSource();
            boolean userReader = true;

            try {
                // Create a reader if not set by user
                if (reader == null) {
                    reader = _readerManager.getXMLReader();
                    userReader = false;
                }

                // Hook up reader and output handler
                try {
                    reader.setProperty(LEXICAL_HANDLER_PROPERTY, handler);
                    reader.setFeature(NAMESPACE_PREFIXES_FEATURE, true);
                } catch (SAXException e) {
                    // Falls through
                }
                reader.setContentHandler(handler);

                // Start pushing SAX events
                reader.parse(input);
            } finally {
                if (!userReader) {
                    _readerManager.releaseXMLReader(reader);
                }
            }
        } else if (source instanceof StAXSource) {
            final StAXSource staxSource = (StAXSource)source;
            StAXEvent2SAX staxevent2sax = null;
            StAXStream2SAX staxStream2SAX = null; 
            if (staxSource.getXMLEventReader() != null) {
                final XMLEventReader xmlEventReader = staxSource.getXMLEventReader();
                staxevent2sax = new StAXEvent2SAX(xmlEventReader);
                staxevent2sax.setContentHandler(handler);
                staxevent2sax.parse();
                handler.flushPending();
            } else if (staxSource.getXMLStreamReader() != null) {
                final XMLStreamReader xmlStreamReader = staxSource.getXMLStreamReader();
                staxStream2SAX = new StAXStream2SAX(xmlStreamReader);
                staxStream2SAX.setContentHandler(handler);
                staxStream2SAX.parse();
                handler.flushPending();
            }
        } else if (source instanceof DOMSource) {
            final DOMSource domsrc = (DOMSource) source;
            new DOM2TO(domsrc.getNode(), handler).parse();
        } else if (source instanceof XSLTCSource) {
            final DOM dom = ((XSLTCSource) source).getDOM(null, _translet);
            ((SAXImpl)dom).copy(handler);
        } else {
            ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_NO_SOURCE_ERR);
            throw new TransformerException(err.toString());
        }
    }

    /**
     * Internal transformation method - uses the internal APIs of XSLTC
     */
    private void transform(Source source, SerializationHandler handler, 
	String encoding) throws TransformerException 
    {
	try {
            /*
             * According to JAXP1.2, new SAXSource()/StreamSource()
             * should create an empty input tree, with a default root node. 
             * new DOMSource()creates an empty document using DocumentBuilder.
             * newDocument(); Use DocumentBuilder.newDocument() for all 3 
             * situations, since there is no clear spec. how to create 
             * an empty tree when both SAXSource() and StreamSource() are used.
             */
            if ((source instanceof StreamSource && source.getSystemId()==null 
                && ((StreamSource)source).getInputStream()==null &&
                ((StreamSource)source).getReader()==null)||
                (source instanceof SAXSource &&