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You acknowledge that Software is not designed, licensed or intended for use in the design, construction, operation or maintenance of any nuclear facility. $Id: BrokerTransformer.java,v 1.1 2003/11/18 03:51:28 gmurray71 Exp $ */package com.sun.j2ee.blueprints.opc.webservicebroker.provider;import java.io.*;import java.util.*;import org.w3c.dom.*;import org.xml.sax.*;import javax.xml.parsers.*;import org.xml.sax.helpers.*;import javax.xml.transform.*;import javax.xml.transform.dom.*;import javax.xml.transform.stream.*;public class BrokerTransformer {        public static final String ACTIVITY_INVOICE = "http://java.sun.com/blueprints/schemas/invoice-activity.xsd";    public static final String AIRLINE_INVOICE = "http://java.sun.com/blueprints/schemas/invoice-airline.xsd";    public static final String LODGING_INVOICE = "http://java.sun.com/blueprints/schemas/invoice-lodging.xsd";    public static final String XSL_CLASSPATH_BASE = "/com/sun/j2ee/blueprints/opc/webservicebroker/provider/";        public static final String ACTIVITY_XSL = "invoice-activity.xsl";        public static final String AIRLINE_XSL = "invoice-airline.xsl";    public static final String LODGING_XSL = "invoice-lodging.xsl";        private String transformedDoc = null;    private ByteArrayOutputStream bos = null;    private CharArrayWriter  caw = null;    private SAXParser parser = null;    private HashMap transformers = null;    private TransformerFactory transformerFactory = null;        /**     *  The InputSource provided to this class needs to be read     *  2 times. We need to read the source to determine what document     *  transformation needs to be perfomed (e.g. which style sheet     *  to apply) and then we need to transform the actuall document.     *  In order to do this we coppy the InputSource to a ByteArrayOutputStream     *  so that we can create a new InputSource whenever we need to do something      *  with the doucment.     */        public BrokerTransformer() {        SAXParserFactory sparserFactory = SAXParserFactory.newInstance();         try {            sparserFactory.setValidating(true);            sparserFactory.setNamespaceAware(true);            parser = sparserFactory.newSAXParser();            // create Transfromers            addTransformer(ACTIVITY_XSL);            addTransformer(AIRLINE_XSL);            addTransformer(LODGING_XSL);        } catch (Exception ex) {           System.err.println("BrokerTransformer initizalization error: " + ex);        }    }        private void addTransformer(String name) {        if (transformers == null) transformers = new HashMap();        if (transformerFactory == null) {               transformerFactory = TransformerFactory.newInstance();        }        StreamSource tranformerXSL =                     new StreamSource(getClass().getResourceAsStream(                                   XSL_CLASSPATH_BASE + name));        try {            Transformer tempTransfomer =                     transformerFactory.newTransformer(tranformerXSL);                    transformers.put(name, tempTransfomer);        } catch (TransformerConfigurationException fcx) {}    }        private void  init(InputSource in) {        try {             transformedDoc = null;            caw = new CharArrayWriter();             Reader reader = in.getCharacterStream();            // copy InputSource to CharArrayWriter the  so we can re-create the InputSource            caw = new CharArrayWriter();            long total =0;            char [] buff = new char[1024];            while (true) {                int read = reader.read(buff,0,buff.length);                total += read;                if (read <=0) break;                caw.write(buff,0, read);            }            caw.close();            reader.close();        } catch (java.io.IOException iox) {            iox.printStackTrace();        }    }        public String transform(InputSource is) {        // Make a local copy of the InputSource so we can use it twice        init(is);        try {            // find out the document type and based on that apply the correct             // transformation            parser.parse(new InputSource(new CharArrayReader(caw.toCharArray())),                        new DefaultHandler() {                                 private boolean foundFirst = false;                                public void startElement(String namespace,                                                              String name,                                                              String qName,                                                              Attributes attrs) {                                   if (!foundFirst) {                                      if ( name.equals("Invoice") ) {                                        String schemaLocation = attrs.getValue("xsi:schemaLocation");                                        if (schemaLocation.endsWith( AIRLINE_INVOICE)) {                                            doXSLTTransformation((Transformer)transformers.get(AIRLINE_XSL));                                        } else if (schemaLocation.endsWith( ACTIVITY_INVOICE)) {                                            doXSLTTransformation((Transformer)transformers.get(ACTIVITY_XSL));                                        } else if (schemaLocation.endsWith( LODGING_INVOICE)) {                                            doXSLTTransformation((Transformer)transformers.get(LODGING_XSL));                                        }                                }                         }                    }            });        } catch (org.xml.sax.SAXException ex) {            System.err.println("BrokerTransformer error: " + ex);        } catch (IOException iox) {            System.err.println("BrokerTransformer error: " + iox);        }        return transformedDoc;    }        private void doXSLTTransformation (Transformer transformer) {        StreamSource in = new StreamSource(new CharArrayReader(caw.toCharArray()));        ByteArrayOutputStream bos = new ByteArrayOutputStream();        StreamResult result = new StreamResult(new ByteArrayOutputStream());          try {                if (transformer != null) {                transformer.transform(in,result);                String enc = transformer.getOutputProperty(OutputKeys.ENCODING);                 transformedDoc =                     ((ByteArrayOutputStream)result.getOutputStream()).toString(enc);            } else {                System.err.println("BrokerTransformer error: Transformer not set");            }        } catch (Exception ex) {            ex.printStackTrace();        }    }}