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   SAX: multiple handlers

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  • From: David Megginson <ak117@freenet.carleton.ca>
  • To: xml-dev Mailing List <xml-dev@ic.ac.uk>
  • Date: Tue, 24 Feb 1998 09:23:30 -0500

In a private message, one SAX user raised the issue again of multiple
handlers.  The user suggested the situation where someone wants to
extract information from a document _and_ copy the document to an
OutputStream at the same time: for a clean implementation, each of
these should be in a different handler.

During the last round, most people vetoed this idea.  Here it is
again, though, for your consideration:

  package org.xml.sax;
  import java.io.InputStream;

  public interface Parser {

    public void addEntityHandler (EntityHandler handler);
    public void removeEntityHandler (EntityHandler handler);

    public void addDocumentHandler (DocumentHandler handler);
    public void removeDocumentHandler (DocumentHandler handler);

    public void addErrorHandler (ErrorHandler handler);
    public void removeErrorHandler (ErrorHandler handler);

    public void parse (String publicId, String systemId)
      throws java.lang.Exception;

    public void parse (String publicId, String systemId,
                       InputStream inputStream)
      throws java.lang.Exception;


Any further thoughts on this issue?

All the best,


David Megginson                 ak117@freenet.carleton.ca
Microstar Software Ltd.         dmeggins@microstar.com

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