org.wikimodel.wem.xhtml.filter
Class XHTMLWhitespaceXMLFilter

java.lang.Object
  org.xml.sax.helpers.XMLFilterImpl
      org.wikimodel.wem.xhtml.filter.DefaultXMLFilter
          org.wikimodel.wem.xhtml.filter.XHTMLWhitespaceXMLFilter

All Implemented Interfaces:

ContentHandler, DTDHandler, EntityResolver, ErrorHandler, LexicalHandler, XMLFilter, XMLReader

public class XHTMLWhitespaceXMLFilter
extends DefaultXMLFilter

Removes non-semantic whitespaces in XML elements. See http://www.w3.org/TR/html4/struct/text.html#h-9.1 for more details. Possible use cases:

• UC1: <tag1>(sp)(sp)one(sp)(sp)two(sp)(sp)</tag1> becomes <tag1>one(sp)two</tag1>
• UC2: <tag1>(sp)(sp)one(sp)(sp)two(sp)(sp)<tag2>three</tag2></tag1> becomes <tag1>one(sp)two(sp)<tag2>three</tag2></tag1>
• UC3: <tag1>(\n\r\t)one(\n\r\t)two(\n\r\t)</tag1> becomes <tag1>one(sp)two</tag1>
• UC4: </tag1>(sp)(sp)(\n\r\t)<tag2> (where tag1 and tag2 are not both block elements) becomes </tag1> <tag2>. If tag1 and tag2 are block elements all spaces are removed
• UC5: <![CDATA[(\n\r\t)(sp)(sp)one(sp)(sp)(\n\r\t)]]> is left untouched
• UC6: <pre>(\n\r\t)(sp)(sp)one(sp)(sp)(\n\r\t)</pre> is left untouched
• UC7: <tag1>(sp)(sp)one(sp)(sp)<!--comment-->(sp)(sp)two(sp)(sp)</tag1> becomes <tag1>one<!--comment-->two</tag1>
• UC8: </tag1>(sp)(sp)one(sp)(sp)</tag2> becomes </tag1>(sp)one</tag2>
• UC9: Comments which have a meaning for the XHTML parser do not have spaces removed in the content preceding them

Author:

vmassol

Field Summary

Fields inherited from class org.wikimodel.wem.xhtml.filter.DefaultXMLFilter

SAX_LEXICAL_HANDLER_PROPERTY

Constructor Summary

XHTMLWhitespaceXMLFilter()

XHTMLWhitespaceXMLFilter(XMLReader reader)

Method Summary

void	characters(char[] ch, int start, int length)
protected void	cleanExtraWhiteSpaces()
void	comment(char[] ch, int start, int length)
void	endCDATA()
void	endElement(String uri, String localName, String qName)
protected StringBuffer	getContent()
void	ignorableWhitespace(char[] ch, int start, int length)
protected boolean	isSemanticComment(String comment) We remove spaces around non semantic comments.
protected void	sendCharacters(String content)
protected void	sendContent()
protected void	sendPreviousContent(boolean trimTrailing)
protected boolean	shouldRemoveWhiteSpaces()
void	startCDATA()
void	startElement(String uri, String localName, String qName, Attributes atts)
protected void	trimLeadingWhiteSpaces()
protected String	trimLeadingWhiteSpaces(CharSequence content)
protected void	trimTrailingWhiteSpaces()
protected String	trimTrailingWhiteSpaces(CharSequence content)

Methods inherited from class org.wikimodel.wem.xhtml.filter.DefaultXMLFilter

endDTD, endEntity, getProperty, parse, setProperty, startDTD, startEntity

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

XHTMLWhitespaceXMLFilter

public XHTMLWhitespaceXMLFilter()

XHTMLWhitespaceXMLFilter

public XHTMLWhitespaceXMLFilter(XMLReader reader)

Method Detail

ignorableWhitespace

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

Specified by:

ignorableWhitespace in interface ContentHandler

Overrides:

ignorableWhitespace in class XMLFilterImpl

Throws:

SAXException

characters

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

Specified by:

characters in interface ContentHandler

Overrides:

characters in class XMLFilterImpl

Throws:

SAXException

startElement

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

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

Specified by:

endElement in interface ContentHandler

Overrides:

endElement in class XMLFilterImpl

Throws:

SAXException

startCDATA

public void startCDATA()
                throws SAXException

Specified by:

startCDATA in interface LexicalHandler

Overrides:

startCDATA in class DefaultXMLFilter

Throws:

SAXException

endCDATA

public void endCDATA()
              throws SAXException

Specified by:

endCDATA in interface LexicalHandler

Overrides:

endCDATA in class DefaultXMLFilter

Throws:

SAXException

comment

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

Specified by:

comment in interface LexicalHandler

Overrides:

comment in class DefaultXMLFilter

Throws:

SAXException

shouldRemoveWhiteSpaces

protected boolean shouldRemoveWhiteSpaces()

sendPreviousContent

protected void sendPreviousContent(boolean trimTrailing)
                            throws SAXException

Throws:

SAXException

sendContent

protected void sendContent()
                    throws SAXException

Throws:

SAXException

sendCharacters

protected void sendCharacters(String content)
                       throws SAXException

Throws:

SAXException

cleanExtraWhiteSpaces

protected void cleanExtraWhiteSpaces()

trimLeadingWhiteSpaces

protected void trimLeadingWhiteSpaces()

trimLeadingWhiteSpaces

protected String trimLeadingWhiteSpaces(CharSequence content)

trimTrailingWhiteSpaces

protected void trimTrailingWhiteSpaces()

trimTrailingWhiteSpaces

protected String trimTrailingWhiteSpaces(CharSequence content)

getContent

protected StringBuffer getContent()

isSemanticComment

protected boolean isSemanticComment(String comment)

We remove spaces around non semantic comments.

Parameters:

comment - the comment to evaluate

Returns:

true if the comment is a semantic one