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From Steven.Mur...@ftid.com
Subject RE: Bug 25564 - CVS tagdiff does not escape XML characters
Date Fri, 19 Dec 2003 11:35:24 GMT
> I noticed though that with JDK 1.4.2, even when requesting indenting,
> the resulting file is not indented :-(

I have found this to be very implementation dependent, with the version I 
used, not setting the indent put every thing on a single line. I'll have 
to have a look at the xalan/xerces source code to see what is going on.

Steve








Dominique Devienne <DDevienne@lgc.com>
18/12/2003 16:53
Please respond to "Ant Developers List"

 
        To:     Steven Murphy/DSD/LONDON/FTI@FTI, "'Ant Developers List '" 
<dev@ant.apache.org>
        cc: 
        Subject:        RE: Bug 25564 - CVS tagdiff does not escape XML characters


Thanks Steven! Interesting ;-) 

Included below is my own twist on the technique you demonstated
that allows to encapsulate the SAX/TrAX code. Clients just
implement the XmlContentProvider, probably as an anonymous inner
class at the same time as calling XmlWriter.write().

I noticed though that with JDK 1.4.2, even when requesting indenting,
the resulting file is not indented :-(

package com.lgc.buildmagic.util;

import java.io.File;
import java.io.Writer;
import java.io.OutputStream;
import java.io.IOException;

// SAX classes
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.ContentHandler;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.helpers.XMLFilterImpl;

// TrAX classes
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;

public class XmlWriter {

  /** The mirror image of SAX's ContentHandler that writes to a handler. 
*/
  public interface XmlContentProvider {
    void writeTo(ContentHandler to)
         throws SAXException;
  }

  /** Just a dummy impl of the content provider interface above for 
testing.
*/
  public static class MyProvider
                      implements XmlContentProvider {
    public void writeTo(ContentHandler to)
                throws SAXException {
      final AttributesImpl attributes = new AttributesImpl();
      to.startDocument();
      to.startElement("", "history-cache", "history-cache", attributes);

       to.startElement("", "entries", "entries", attributes);
        to.startElement("", "name", "name", attributes);
        String name = "Javah&cache";
        to.characters(name.toCharArray(), 0, name.length());
        to.endElement("", "name", "name");

        to.startElement("", "tag", "tag", attributes);
        String tag = "<tag>text</tag>";
        to.characters(tag.toCharArray(), 0, tag.length());
        to.endElement("", "tag", "tag");
       to.endElement("", "entries", "entries");

      to.endElement("", "history-cache", "history-cache");
      to.endDocument();
    }
  }

  public void write(File file, XmlContentProvider provider)
              throws TransformerException {
    write(new StreamResult(file), provider);
  }

  public void write(OutputStream outputStream, XmlContentProvider 
provider)
              throws TransformerException {
    write(new StreamResult(outputStream), provider);
  }

  public void write(Writer writer, XmlContentProvider provider)
              throws TransformerException {
    write(new StreamResult(writer), provider);
  }

  /**
   * Writes SAX events sent by an XML provider using an identity 
transform.
   *
   * @param  result The stream to write the result of the identity 
transform
to.
   * @param  provider The XML content provider.
   */
  private void write(StreamResult result, final XmlContentProvider 
provider)
               throws TransformerException {
    TransformerFactory factory = TransformerFactory.newInstance();
    Transformer transformer = factory.newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");

    XMLFilterImpl reader = new XMLFilterImpl() {
      public void parse(InputSource input)
                  throws IOException,
                         SAXException {
        provider.writeTo(getContentHandler());
      }
    };
    SAXSource source = new SAXSource(reader, new InputSource());
    transformer.transform(source, result);
  }

  public static void main(String[] args)
                     throws Exception {
    new XmlWriter().write(new File("XmlWriter.xml"), new MyProvider());
  }

}

-----Original Message-----
From: Steven.Murphy@ftid.com
To: Ant Developers List
Sent: 12/18/2003 7:36 AM
Subject: RE: Bug 25564 - CVS tagdiff does not escape XML characters

Hi,

I have attached a file to the bug report.

http://issues.apache.org/bugzilla/show_bug.cgi?id=25564

Steve





Dominique Devienne <DDevienne@lgc.com>
17/12/2003 11:14
Please respond to "Ant Developers List"

 
        To:     "'Antoine Levy-Lambert '" <antoine@antbuild.com>, "'Ant
Developers List '" 
<dev@ant.apache.org>
        cc: 
        Subject:        RE: Bug 25564 - CVS tagdiff does not escape XML
characters


From: <Steven.Murphy@ftid.com>

> My favoured way of generating XML from a class is to extend
> XMLFilterImpl and fire SAX events to a Transformer with no
> stylesheet and StreamResult of the required output file,
> inspired by Cocoon 2.

Would you care to provide a concrete example please? Thanks, --DD

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