com.deltaxml.sync.filters
Class UniDeltaCompress

java.lang.Object
  org.xml.sax.helpers.XMLFilterImpl
      com.deltaxml.sync.filters.UniDeltaCompress

All Implemented Interfaces:

ContentHandler, DTDHandler, EntityResolver, ErrorHandler, XMLFilter, XMLReader

public final class UniDeltaCompress
extends XMLFilterImpl

Converts a full unidelta file into a compressed format.

This involves removing vsets within a tree that are the same as the ancestor and adding invariant attributes (those that are unchanged throughout all versions) back onto their containing start element tag as attributes

Example: The unidelta file

 <root xmlns:dxu="..." dxu:vset="|C|A|B|">
   <dxu:attributes dxu:vset="|C|A|B|">
     <att1 dxu:vset="|C|A|B|">
       <dxu:PCDATA dxu:vset="|C|A|B|">value</dxu:PCDATA>
     </att1>
     <att2 dxu:vset="|C|B|">
       <dxu:PCDATA dxu:vset="|C|">c's value</dxu:PCDATA>
       <dxu:PCDATA dxu:vset="|B|">b's value</dxu:PCDATA>
     </att2>
   </dxu:attributes>
   <child1 dxu:vset="|C|A|B|">
     <grandchild dxu:vset="|B|"/>
   </child1>
   <child dxu:vset="|A|B|"/>
 </root>
 

would be compressed into

 <root xmlns:dxu="..." dxu:vset="|C|A|B|" att1="value">
   <dxu:attributes>
     <att2 dxu:vset="|C|B|">
       <dxu:PCDATA dxu:vset="|C|">c's value</dxu:PCDATA>
       <dxu:PCDATA dxu:vset="|B|">b's value</dxu:PCDATA>
     </att2>
   </dxu:attributes>
   <child1>
     <grandchild dxu:vset="|B|"/>
   </child1>
   <child dxu:vset="|A|B|"/>
 </root>
 

Note: This class has not been designed to be extendable and so has been declared final.

Version:

$Revision: 3348 $

Author:

Tristan Mitchell

Constructor Summary

UniDeltaCompress()
Creates a new UniDeltaCompress filter

Method Summary

void	characters(char[] ch, int start, int length) Overrides the default characters method.
void	endElement(String uri, String localName, String qName) Overrides the default endElement method.
void	startDocument() Overrides the default startDocument method.
void	startElement(String uri, String localName, String qName, Attributes atts) Overrides the default startElement method.

Methods inherited from class org.xml.sax.helpers.XMLFilterImpl

endDocument, endPrefixMapping, error, fatalError, getContentHandler, getDTDHandler, getEntityResolver, getErrorHandler, getFeature, getParent, getProperty, ignorableWhitespace, notationDecl, parse, parse, processingInstruction, resolveEntity, setContentHandler, setDocumentLocator, setDTDHandler, setEntityResolver, setErrorHandler, setFeature, setParent, setProperty, skippedEntity, startPrefixMapping, unparsedEntityDecl, warning

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UniDeltaCompress

public UniDeltaCompress()

Creates a new UniDeltaCompress filter

Method Detail

startDocument

public void startDocument()
                   throws SAXException

Overrides the default startDocument method.

Specified by:

startDocument in interface ContentHandler

Overrides:

startDocument in class XMLFilterImpl

Throws:

SAXException

startElement

public void startElement(String uri,
                         String localName,
                         String qName,
                         Attributes atts)
                  throws SAXException

Overrides the default startElement method.

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class XMLFilterImpl

Throws:

SAXException

endElement

public void endElement(String uri,
                       String localName,
                       String qName)
                throws SAXException

Overrides the default endElement method.

Specified by:

endElement in interface ContentHandler

Overrides:

endElement in class XMLFilterImpl

Throws:

SAXException

characters

public void characters(char[] ch,
                       int start,
                       int length)
                throws SAXException

Overrides the default characters method.

Specified by:

characters in interface ContentHandler

Overrides:

characters in class XMLFilterImpl

Throws:

SAXException