Examples of org.xml.sax.XMLReader

org.xml.sax.XMLReader
axproject.org'>http://www.saxproject.org for further information.
Note: despite its name, this interface does not extend the standard Java {@link java.io.Reader Reader} interface, because reading XML is a fundamentally different activity than reading character data.

XMLReader is the interface that an XML parser's SAX2 driver must implement. This interface allows an application to set and query features and properties in the parser, to register event handlers for document processing, and to initiate a document parse.

All SAX interfaces are assumed to be synchronous: the {@link #parse parse} methods must not return until parsingis complete, and readers must wait for an event-handler callback to return before reporting the next event.

This interface replaces the (now deprecated) SAX 1.0 {@link org.xml.sax.Parser Parser} interface. The XMLReader interfacecontains two important enhancements over the old Parser interface (as well as some minor ones):
1. it adds a standard way to query and set features and properties; and
2. it adds Namespace support, which is required for many higher-level XML standards.
There are adapters available to convert a SAX1 Parser to a SAX2 XMLReader and vice-versa.
@since SAX 2.0 @author David Megginson @version 2.0.1+ (sax2r3pre1) @see org.xml.sax.XMLFilter @see org.xml.sax.helpers.ParserAdapter @see org.xml.sax.helpers.XMLReaderAdapter

      }
      catch (Exception e) {
    factory.setNamespaceAware(true);
      }
      final SAXParser parser = factory.newSAXParser();
      final XMLReader reader = parser.getXMLReader();


      // Set the DOM's DOM builder as the XMLReader's SAX2 content handler
      final DOMImpl dom = new DOMImpl();
      DOMBuilder builder = dom.getBuilder();
      reader.setContentHandler(builder);


      try {
    String prop = "http://xml.org/sax/properties/lexical-handler";
    reader.setProperty(prop, builder);
      }
      catch (SAXException e) {
    // quitely ignored
      }
      
      // Create a DTD monitor and pass it to the XMLReader object
      final DTDMonitor dtdMonitor = new DTDMonitor(reader);
      AbstractTranslet _translet = (AbstractTranslet)translet;
      dom.setDocumentURI(_fileName);
      if (_uri)
    reader.parse(_fileName);
      else
    reader.parse(new File(_fileName).toURL().toExternalForm());


      builder = null;


      // If there are any elements with ID attributes, build an index
      dtdMonitor.buildIdIndex(dom, 0, _translet);

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        _transformer = new TransformerHandlerImpl( 
    (TransformerImpl) templates.newTransformer());
    }


    private void createParent() throws SAXException {
  XMLReader parent = null;
        try {
            SAXParserFactory pfactory = SAXParserFactory.newInstance();
            pfactory.setNamespaceAware(true);
            SAXParser saxparser = pfactory.newSAXParser();
            parent = saxparser.getXMLReader();

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              for (int i = 0; i < 1; i++) // Loop for diagnosing bugs with inconsistent behavior
              {
              // System.out.println("Testing the TransformerHandler...");


              // ===============
              XMLReader reader = null;


              // Use JAXP1.1 ( if possible )      
              try
              {
                javax.xml.parsers.SAXParserFactory factory =
                  javax.xml.parsers.SAXParserFactory.newInstance();


                factory.setNamespaceAware(true);


                javax.xml.parsers.SAXParser jaxpParser =
                  factory.newSAXParser();


                reader = jaxpParser.getXMLReader();
              }
              catch (javax.xml.parsers.ParserConfigurationException ex)
              {
                throw new org.xml.sax.SAXException(ex);
              }
              catch (javax.xml.parsers.FactoryConfigurationError ex1)
              {
                throw new org.xml.sax.SAXException(ex1.toString());
              }
              catch (NoSuchMethodError ex2){}
              catch (AbstractMethodError ame){}


              if (null == reader)
              {
                reader = XMLReaderFactory.createXMLReader();
              }
              
              if (!useXSLTC)
                stf.setAttribute(org.apache.xalan.processor.TransformerFactoryImpl.FEATURE_INCREMENTAL, 
                   Boolean.TRUE);
                 
              TransformerHandler th = stf.newTransformerHandler(stylesheet);
              
              reader.setContentHandler(th);
              reader.setDTDHandler(th);
              
              if(th instanceof org.xml.sax.ErrorHandler)
                reader.setErrorHandler((org.xml.sax.ErrorHandler)th);
              
              try
              {
                reader.setProperty(
                  "http://xml.org/sax/properties/lexical-handler", th);
              }
              catch (org.xml.sax.SAXNotRecognizedException e){}
              catch (org.xml.sax.SAXNotSupportedException e){}
              try
              {
                reader.setFeature("http://xml.org/sax/features/namespace-prefixes",
                                  true);
              } catch (org.xml.sax.SAXException se) {}
        
              try
              {
                reader.setFeature("http://apache.org/xml/features/validation/dynamic",
                                  true);
              } catch (org.xml.sax.SAXException se) {}
              
              th.setResult(strResult);
              
              reader.parse(new InputSource(inFileName));
              }                            
            }
            else
            {
              if (entityResolver != null)
              {
                XMLReader reader = null;


                // Use JAXP1.1 ( if possible )      
                try
                {
                  javax.xml.parsers.SAXParserFactory factory =
                    javax.xml.parsers.SAXParserFactory.newInstance();


                  factory.setNamespaceAware(true);


                  javax.xml.parsers.SAXParser jaxpParser =
                    factory.newSAXParser();


                  reader = jaxpParser.getXMLReader();
                }
                catch (javax.xml.parsers.ParserConfigurationException ex)
                {
                  throw new org.xml.sax.SAXException(ex);
                }
                catch (javax.xml.parsers.FactoryConfigurationError ex1)
                {
                  throw new org.xml.sax.SAXException(ex1.toString());
                }
                catch (NoSuchMethodError ex2){}
                catch (AbstractMethodError ame){}


                if (null == reader)
                {
                  reader = XMLReaderFactory.createXMLReader();
                }


                reader.setEntityResolver(entityResolver);


                if (contentHandler != null)
                {
                  SAXResult result = new SAXResult(contentHandler);

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            InputSource src = ss.getInputSource();
            if (src == null || (src.getSystemId() == null && src.getPublicId() == null)) {
                if (ss.getXMLReader() != null) {
                    //OK - reader is OK.  We'll use that out
                    StreamWriterContentHandler ch = new StreamWriterContentHandler(writer);
                    XMLReader reader = ((SAXSource)source).getXMLReader();
                    reader.setContentHandler(ch);
                    try {
                        try {
                            reader.setFeature("http://xml.org/sax/features/namespaces", true);
                        } catch (Throwable t) {
                            //ignore
                        }
                        try {
                            reader.setProperty("http://xml.org/sax/properties/lexical-handler", ch);
                        } catch (Throwable t) {
                            //ignore
                        }
                        reader.parse(((SAXSource)source).getInputSource());
                        return;
                    } catch (Exception e) {
                        throw new XMLStreamException(e.getMessage(), e);
                    }
                } else if (ss.getInputSource() == null) {
                    //nothing to copy, just return
                    return;
                }
            }
       
        } else if (source instanceof StreamSource) {
            StreamSource ss = (StreamSource)source;
            if (ss.getInputStream() == null
                && ss.getReader() == null
                && ss.getSystemId() == null) {
                //nothing to copy, just return
                return;
            }
        }
        XMLStreamReader reader = createXMLStreamReader(source);
        copy(reader, writer);
        reader.close();
    }

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            // Validate instance documents
            if (instances != null && instances.size() > 0) {
                final int length = instances.size();
                if (validationSource.equals("sax")) {
                    // SAXSource
                    XMLReader reader = XMLReaderFactory.createXMLReader();
                    for (int j = 0; j < length; ++j) {
                        String systemId = (String) instances.elementAt(j);
                        SAXSource source = new SAXSource(reader, new InputSource(systemId));
                        sourceValidator.validate(validator, source, systemId, repetition, memoryUsage);
                    }

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    CAS cas2 = CasCreationUtils.createCas(typeSystem, new TypePriorities_impl(), indexes);
    XCASDeserializer deser = new XCASDeserializer(cas2.getTypeSystem());
    ContentHandler deserHandler = deser.getXCASHandler(cas2);
    SAXParserFactory fact = SAXParserFactory.newInstance();
    SAXParser parser = fact.newSAXParser();
    XMLReader xmlReader = parser.getXMLReader();
    xmlReader.setContentHandler(deserHandler);
    xmlReader.parse(new InputSource(new StringReader(xml)));


    // serialize the new CAS
    sw = new StringWriter();
    xmlSer = new XMLSerializer(sw, false);
    xcasSer = new XCASSerializer(cas.getTypeSystem());

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    InputStream serCasStream = new FileInputStream(JUnitExtension.getFile("ExampleCas/cas.xml"));
    XCASDeserializer deser = new XCASDeserializer(cas.getTypeSystem());
    ContentHandler deserHandler = deser.getXCASHandler(cas);
    SAXParserFactory fact = SAXParserFactory.newInstance();
    SAXParser parser = fact.newSAXParser();
    XMLReader xmlReader = parser.getXMLReader();
    xmlReader.setContentHandler(deserHandler);
    xmlReader.parse(new InputSource(serCasStream));
    serCasStream.close();


    // check that array refs are not null
    Type entityType = cas.getTypeSystem().getType("org.apache.uima.testTypeSystem.Entity");
    Feature classesFeat = entityType.getFeatureByBaseName("classes");
    Iterator iter = cas.getIndexRepository().getIndex("testEntityIndex").iterator();
    assertTrue(iter.hasNext());
    while (iter.hasNext()) {
      FeatureStructure fs = (FeatureStructure) iter.next();
      StringArrayFS arrayFS = (StringArrayFS) fs.getFeatureValue(classesFeat);
      assertNotNull(arrayFS);
      for (int i = 0; i < arrayFS.size(); i++) {
        assertNotNull(arrayFS.get(i));
      }
    }


    // reserialize
    StringWriter sw = new StringWriter();
    XMLSerializer xmlSer = new XMLSerializer(sw, false);
    XCASSerializer xcasSer = new XCASSerializer(cas.getTypeSystem());
    xcasSer.serialize(cas, xmlSer.getContentHandler(), true);
    String xml = sw.getBuffer().toString();


    CAS cas2 = CasCreationUtils.createCas(typeSystem, new TypePriorities_impl(), indexes);


    // deserialize into another CAS
    XCASDeserializer deser2 = new XCASDeserializer(cas2.getTypeSystem());
    ContentHandler deserHandler2 = deser2.getXCASHandler(cas2);
    xmlReader.setContentHandler(deserHandler2);
    xmlReader.parse(new InputSource(new StringReader(xml)));


    // compare
    assertEquals(cas.getAnnotationIndex().size(), cas2.getAnnotationIndex().size());
    // CasComparer.assertEquals(cas,cas2);
  }

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    InputStream serCasStream = new FileInputStream(JUnitExtension.getFile("ExampleCas/cas.xml"));
    XCASDeserializer deser = new XCASDeserializer(cas.getTypeSystem());
    ContentHandler deserHandler = deser.getXCASHandler(cas, ootsd);
    SAXParserFactory fact = SAXParserFactory.newInstance();
    SAXParser parser = fact.newSAXParser();
    XMLReader xmlReader = parser.getXMLReader();
    xmlReader.setContentHandler(deserHandler);
    xmlReader.parse(new InputSource(serCasStream));
    serCasStream.close();


    // now reserialize including OutOfTypeSystem data
    XCASSerializer xcasSer = new XCASSerializer(cas.getTypeSystem());
    StringWriter sw = new StringWriter();
    XMLSerializer xmlSer = new XMLSerializer(sw, false);
    xcasSer.serialize(cas, xmlSer.getContentHandler(), true, ootsd);
    String xml = sw.getBuffer().toString();
    // System.out.println(xml);


    // deserialize into a CAS that accepts the full typesystem
    CAS cas2 = CasCreationUtils.createCas(typeSystem, new TypePriorities_impl(), indexes);
    XCASDeserializer deser2 = new XCASDeserializer(cas2.getTypeSystem());
    ContentHandler deserHandler2 = deser2.getXCASHandler(cas2);
    xmlReader = parser.getXMLReader();
    xmlReader.setContentHandler(deserHandler2);
    xmlReader.parse(new InputSource(new StringReader(xml)));


    // check that array refs are not null
    Type entityType = cas2.getTypeSystem().getType("org.apache.uima.testTypeSystem.Entity");
    Feature classesFeat = entityType.getFeatureByBaseName("classes");
    Iterator iter = cas2.getIndexRepository().getIndex("testEntityIndex").iterator();

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    String xcas = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><CAS>"
            + "<uima.tcas.Document _content=\"text\">Test Document</uima.tcas.Document>"
            + "<uima.tcas.DocumentAnnotation _indexed=\"1\" _id=\"8\" sofa=\"1\" begin=\"0\" end=\"13\" language=\"en\"/>"
            + "<foo.Bar _indexed=\"1\" _id=\"2\" sofa=\"1\" begin=\"0\" end=\"0\" baz=\"blah\">this is the value feature</foo.Bar></CAS>";
    OutOfTypeSystemData ootsd = new OutOfTypeSystemData();
    XMLReader xmlReader = XMLReaderFactory.createXMLReader();
    XCASDeserializer deser = new XCASDeserializer(cas.getTypeSystem());
    ContentHandler handler = deser.getXCASHandler(cas, ootsd);
    xmlReader.setContentHandler(handler);
    xmlReader.parse(new InputSource(new StringReader(xcas)));


    // now reserialize including OutOfTypeSystem data
    XCASSerializer xcasSer = new XCASSerializer(cas.getTypeSystem());
    StringWriter sw = new StringWriter();
    XMLSerializer xmlSer = new XMLSerializer(sw, false);

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    for (int i = 0; i < 2; i++) {
      XCASDeserializer newDeser = new XCASDeserializer(newCas.getTypeSystem());
      ContentHandler newDeserHandler = newDeser.getXCASHandler(newCas);
      SAXParserFactory fact = SAXParserFactory.newInstance();
      SAXParser parser = fact.newSAXParser();
      XMLReader xmlReader = parser.getXMLReader();
      xmlReader.setContentHandler(newDeserHandler);
      xmlReader.parse(new InputSource(new StringReader(xml)));


      // check sofas
      assertEquals("This is a test", newCas.getDocumentText());
      CAS newCas2 = newCas.getView("OtherSofa");
      assertEquals("This is only a test", newCas2.getDocumentText());

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