Java/XML/XMLStreamReader

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Debugging utilities for XmlStreamReader

   <source lang="java">

/* Copyright 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.
*/

// Revised from xml beans import javax.xml.stream.XMLStreamReader; /**

* debugging utilities for XmlStreamReader
*/

public final class XmlStreamUtils {

 public static String printEvent(XMLStreamReader xmlr) {
   StringBuffer b = new StringBuffer();
   b.append("EVENT:[" + xmlr.getLocation().getLineNumber() + "]["
       + xmlr.getLocation().getColumnNumber() + "] ");
   b.append(getName(xmlr.getEventType()));
   b.append(" [");
   switch (xmlr.getEventType()) {
   case XMLStreamReader.START_ELEMENT:
     b.append("<");
     printName(xmlr, b);
     for (int i = 0; i < xmlr.getNamespaceCount(); i++) {
       b.append(" ");
       String n = xmlr.getNamespacePrefix(i);
       if ("xmlns".equals(n)) {
         b.append("xmlns=\"" + xmlr.getNamespaceURI(i) + "\"");
       } else {
         b.append("xmlns:" + n);
         b.append("=\"");
         b.append(xmlr.getNamespaceURI(i));
         b.append("\"");
       }
     }
     for (int i = 0; i < xmlr.getAttributeCount(); i++) {
       b.append(" ");
       printName(xmlr.getAttributePrefix(i), xmlr.getAttributeNamespace(i), xmlr
           .getAttributeLocalName(i), b);
       b.append("=\"");
       b.append(xmlr.getAttributeValue(i));
       b.append("\"");
     }
     b.append(">");
     break;
   case XMLStreamReader.END_ELEMENT:
     b.append("</");
     printName(xmlr, b);
     for (int i = 0; i < xmlr.getNamespaceCount(); i++) {
       b.append(" ");
       String n = xmlr.getNamespacePrefix(i);
       if ("xmlns".equals(n)) {
         b.append("xmlns=\"" + xmlr.getNamespaceURI(i) + "\"");
       } else {
         b.append("xmlns:" + n);
         b.append("=\"");
         b.append(xmlr.getNamespaceURI(i));
         b.append("\"");
       }
     }
     b.append(">");
     break;
   case XMLStreamReader.SPACE:
   case XMLStreamReader.CHARACTERS:
     // b.append(xmlr.getText());
     int start = xmlr.getTextStart();
     int length = xmlr.getTextLength();
     b.append(new String(xmlr.getTextCharacters(), start, length));
     break;
   case XMLStreamReader.PROCESSING_INSTRUCTION:
     String target = xmlr.getPITarget();
     if (target == null)
       target = "";
     String data = xmlr.getPIData();
     if (data == null)
       data = "";
     b.append("<?");
     b.append(target + " " + data);
     b.append("?>");
     break;
   case XMLStreamReader.CDATA:
     b.append("<![CDATA[");
     if (xmlr.hasText())
       b.append(xmlr.getText());
     b.append("]]>");
     break;
   case XMLStreamReader.ruMENT:
     b.append("");
     break;
   case XMLStreamReader.ENTITY_REFERENCE:
     b.append(xmlr.getLocalName() + "=");
     if (xmlr.hasText())
       b.append("[" + xmlr.getText() + "]");
     break;
   case XMLStreamReader.START_DOCUMENT:
     b.append("<?xml");
     b.append(" version="" + xmlr.getVersion() + """);
     b.append(" encoding="" + xmlr.getCharacterEncodingScheme() + """);
     if (xmlr.isStandalone())
       b.append(" standalone="yes"");
     else
       b.append(" standalone="no"");
     b.append("?>");
     break;
   }
   b.append("]");
   return b.toString();
 }
 private static void printName(String prefix, String uri, String localName, StringBuffer b) {
   if (uri != null && !("".equals(uri)))
     b.append("["" + uri + ""]:");
   if (prefix != null && !("".equals(prefix)))
     b.append(prefix + ":");
   if (localName != null)
     b.append(localName);
 }
 private static void printName(XMLStreamReader xmlr, StringBuffer b) {
   if (xmlr.hasName()) {
     String prefix = xmlr.getPrefix();
     String uri = xmlr.getNamespaceURI();
     String localName = xmlr.getLocalName();
     printName(prefix, uri, localName, b);
   }
 }
 public static String getName(int eventType) {
   switch (eventType) {
   case XMLStreamReader.START_ELEMENT:
     return "START_ELEMENT";
   case XMLStreamReader.END_ELEMENT:
     return "END_ELEMENT";
   case XMLStreamReader.PROCESSING_INSTRUCTION:
     return "PROCESSING_INSTRUCTION";
   case XMLStreamReader.CHARACTERS:
     return "CHARACTERS";
   case XMLStreamReader.SPACE:
     return "SPACE";
   case XMLStreamReader.ruMENT:
     return "COMMENT";
   case XMLStreamReader.START_DOCUMENT:
     return "START_DOCUMENT";
   case XMLStreamReader.END_DOCUMENT:
     return "END_DOCUMENT";
   case XMLStreamReader.ENTITY_REFERENCE:
     return "ENTITY_REFERENCE";
   case XMLStreamReader.ATTRIBUTE:
     return "ATTRIBUTE";
   case XMLStreamReader.DTD:
     return "DTD";
   case XMLStreamReader.CDATA:
     return "CDATA";
   case XMLStreamReader.NAMESPACE:
     return "NAMESPACE";
   }
   return "UNKNOWN_EVENT_TYPE";
 }
 public static int getType(String val) {
   if (val.equals("START_ELEMENT"))
     return XMLStreamReader.START_ELEMENT;
   if (val.equals("SPACE"))
     return XMLStreamReader.SPACE;
   if (val.equals("END_ELEMENT"))
     return XMLStreamReader.END_ELEMENT;
   if (val.equals("PROCESSING_INSTRUCTION"))
     return XMLStreamReader.PROCESSING_INSTRUCTION;
   if (val.equals("CHARACTERS"))
     return XMLStreamReader.CHARACTERS;
   if (val.equals("COMMENT"))
     return XMLStreamReader.ruMENT;
   if (val.equals("START_DOCUMENT"))
     return XMLStreamReader.START_DOCUMENT;
   if (val.equals("END_DOCUMENT"))
     return XMLStreamReader.END_DOCUMENT;
   if (val.equals("ATTRIBUTE"))
     return XMLStreamReader.ATTRIBUTE;
   if (val.equals("DTD"))
     return XMLStreamReader.DTD;
   if (val.equals("CDATA"))
     return XMLStreamReader.CDATA;
   if (val.equals("NAMESPACE"))
     return XMLStreamReader.NAMESPACE;
   return -1;
 }

}

 </source>
   
  
 
  



Event count

   <source lang="java">
 

import java.io.File; import java.io.FileInputStream; import javax.xml.stream.EventFilter; import javax.xml.stream.StreamFilter; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamConstants; import javax.xml.stream.XMLStreamException; import javax.xml.stream.XMLStreamReader; import javax.xml.stream.events.XMLEvent; public class MainClass {

 public static void main(String[] args) throws Exception {
   XMLInputFactory inputFactory = XMLInputFactory.newInstance();
   XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream(new File("test.xml")));
   System.out.println(countEvents(reader));
   reader = inputFactory.createXMLStreamReader(new FileInputStream(new File("test.xml")));
   StreamFilter filter = new ElementOnlyFilter();
   reader = inputFactory.createFilteredReader(reader, filter);
   System.out.println(countEvents(reader));
 }
 private static int countEvents(XMLStreamReader reader) throws XMLStreamException {
   int counter = 1;
   while (reader.hasNext()) {
     reader.next();
     counter++;
   }
   return counter;
 }

} class ElementOnlyFilter implements EventFilter, StreamFilter {

 public boolean accept(XMLEvent event) {
   return accept(event.getEventType());
 }
 public boolean accept(XMLStreamReader reader) {
   return accept(reader.getEventType());
 }
 private boolean accept(int eventType) {
   return eventType == XMLStreamConstants.START_ELEMENT
       || eventType == XMLStreamConstants.END_ELEMENT;
 }

}

 </source>
   
  
 
  



Get event type from XMLStreamReader

   <source lang="java">
 

import java.io.File; import java.io.FileInputStream; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamReader; public class MainClass {

 public static void main(String[] args) throws Exception {
   File file = new File("test.xml");
   XMLInputFactory inputFactory = XMLInputFactory.newInstance();
   XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream(file));
   while (reader.getEventType() == 6)
     reader.next();
   int eventTypeID = reader.next();
   System.out.println("Hello " + reader.getText());
 }

}

 </source>
   
  
 
  



Get next from XMLStreamReader

   <source lang="java">
 

import java.io.File; import java.io.FileInputStream; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamReader; public class MainClass {

 public static void main(String[] args) throws Exception {
   File file = new File("test.xml");
   XMLInputFactory inputFactory = XMLInputFactory.newInstance();
   XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream(file));
   while (reader.getEventType() == 6)
     reader.next();
   int eventTypeID = reader.next();
   System.out.println("Hello " + reader.getText());
 }

}

 </source>
   
  
 
  



Get next tag from XMLStreamReader

   <source lang="java">
 

import java.io.File; import java.io.FileInputStream; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamReader; public class MainClass {

 public static void main(String[] args) throws Exception {
   File file = new File("text.xml");
   XMLInputFactory inputFactory = XMLInputFactory.newInstance();
   XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream(file));
   int eventTypeID = reader.nextTag();
   eventTypeID = reader.nextTag();
   eventTypeID = reader.next();
   System.out.println("Hello " + reader.getText());
 }

}

 </source>
   
  
 
  



Read Xml from StreamSource

   <source lang="java">

/**

* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/

import java.io.IOException; import java.io.StringReader; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.stream.StreamSource; import org.w3c.dom.Document; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; import org.xml.sax.SAXException; /**

* Few simple utils to read DOM. This is originally from the Jakarta Commons
* Modeler.
* 
* @author Costin Manolache
*/

public class Utils {

 public static Document readXml(StreamSource is) throws SAXException, IOException,
     ParserConfigurationException {
   DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
   dbf.setValidating(false);
   dbf.setIgnoringComments(false);
   dbf.setIgnoringElementContentWhitespace(true);
   dbf.setNamespaceAware(true);
   // dbf.setCoalescing(true);
   // dbf.setExpandEntityReferences(true);
   DocumentBuilder db = null;
   db = dbf.newDocumentBuilder();
   db.setEntityResolver(new NullResolver());
   // db.setErrorHandler( new MyErrorHandler());
   InputSource is2 = new InputSource();
   is2.setSystemId(is.getSystemId());
   is2.setByteStream(is.getInputStream());
   is2.setCharacterStream(is.getReader());
   return db.parse(is2);
 }

} class NullResolver implements EntityResolver {

 public InputSource resolveEntity(String publicId, String systemId) throws SAXException,
     IOException {
   return new InputSource(new StringReader(""));
 }

}

 </source>
   
  
 
  



XML stream transform

   <source lang="java">

/*

* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
* 
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
* 
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License").  You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
* language governing permissions and limitations under the License.
* 
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code.  If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
* 
* Contributor(s):
* 
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license."  If you don"t indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above.  However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.InputStream; import java.io.OutputStream; import javax.xml.stream.XMLEventReader; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLOutputFactory; /**

* Padmaja Vedula
*/

public class StreamSrcStAXRst {

 static String fileName;
 public static void main(String[] args) {
   if (args.length != 3) {
     System.out.println("Usage: java " + StreamSrcStAXRst.class.getName()
         + " <XML that needs to be transformed>" + " <XSLT file>" + " <Output file>");
     System.exit(1);
   }
   try {
     transform(args);
   } catch (Exception e) {
     e.printStackTrace();
     System.exit(1);
   }
 }
 private static void transform(String[] args) throws Exception {
   fileName = args[2].toString();
   FileInputStream xmlIn = new FileInputStream(args[0]);
   FileInputStream xsltIn = new FileInputStream(args[1]);
   FileOutputStream out = new FileOutputStream(args[2]);
   transform(xmlIn, xsltIn, out);
 }
 public static void transform(InputStream xmlIn, InputStream xsltIn, OutputStream out)
     throws Exception {
   javax.xml.transform.Source xmlSource = new javax.xml.transform.stream.StreamSource(xmlIn);
   javax.xml.transform.Result xmlResult = new javax.xml.transform.stax.StAXResult(XMLOutputFactory
       .newInstance().createXMLStreamWriter(new FileWriter(fileName)));
   javax.xml.transform.Source xsltSource = new javax.xml.transform.stream.StreamSource(xsltIn);
   javax.xml.transform.Source source = new javax.xml.transform.stream.StreamSource(xmlIn);
   // create an instance of TransformerFactory
   javax.xml.transform.TransformerFactory transFact = javax.xml.transform.TransformerFactory
       .newInstance();
   transFact.setAttribute("debug", new String("true"));
   transFact.setAttribute("translet-name", new String("suresh"));
   transFact.setAttribute("generate-translet", new String("true"));
   transFact.setAttribute("jar-name", new String("transletjar"));
   javax.xml.transform.Transformer trans = transFact.newTransformer(xsltSource);
   trans.transform(source, xmlResult);
 }
 private static XMLEventReader getXMLEventReader(String filename) {
   XMLInputFactory xmlif = null;
   XMLEventReader xmlr = null;
   try {
     xmlif = XMLInputFactory.newInstance();
     xmlif.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, Boolean.TRUE);
     xmlif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, Boolean.FALSE);
     xmlif.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, Boolean.TRUE);
     xmlif.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE);
     FileInputStream fis = new FileInputStream(filename);
     xmlr = xmlif.createXMLEventReader(filename, fis);
   } catch (Exception ex) {
     ex.printStackTrace();
   }
   return xmlr;
 }

}

 </source>