uk.ac.starlink.ttools.votlint
Class FudgeNamespaceContentHandler

java.lang.Object
  uk.ac.starlink.ttools.votlint.FudgeNamespaceContentHandler

All Implemented Interfaces:

ContentHandler

public class FudgeNamespaceContentHandler
extends Object
implements ContentHandler

This class provides a hack so that XSD validation can work even when the wrong namespace is declared in the source document. The point of this is that if the document has made a small namespacing error, schema validation by default will simply refuse to recognise any of the elements and provide no further validation reporting. This class hacks the SAX event stream to its downstream client so that if no namespace declaration has been received in the expected namespace, the default namespace is declared as the expected one. If the expected namespace is declared explicitly, this class makes no change to downstream SAX events.

This is not very respectable, but will have the desired effect for most VOTable documents (which do not in any case make much use of namespacing).

Since:

22 Nov 2012

Author:

Mark Taylor

Constructor Summary

FudgeNamespaceContentHandler(ContentHandler base, String tagName, String ns)
Constructor.

Method Summary

void	characters(char[] ch, int start, int length)
void	endDocument()
void	endElement(String uri, String localName, String qName)
void	endPrefixMapping(String prefix)
void	ignorableWhitespace(char[] ch, int start, int length)
void	processingInstruction(String target, String data)
void	setDocumentLocator(Locator locator)
void	skippedEntity(String name)
void	startDocument()
void	startElement(String uri, String localName, String qName, Attributes atts)
void	startPrefixMapping(String prefix, String uri)

Methods inherited from class java.lang.Object

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

Constructor Detail

FudgeNamespaceContentHandler

public FudgeNamespaceContentHandler(ContentHandler base,
                                    String tagName,
                                    String ns)

Constructor.

Parameters:

base - downstream SAX event sink

tagName - name of element within which namespace hacking should take place

ns - namespace to insert

Method Detail

setDocumentLocator

public void setDocumentLocator(Locator locator)

Specified by:

setDocumentLocator in interface ContentHandler

startDocument

public void startDocument()
                   throws SAXException

Specified by:

startDocument in interface ContentHandler

Throws:

SAXException

endDocument

public void endDocument()
                 throws SAXException

Specified by:

endDocument in interface ContentHandler

Throws:

SAXException

startPrefixMapping

public void startPrefixMapping(String prefix,
                               String uri)
                        throws SAXException

Specified by:

startPrefixMapping in interface ContentHandler

Throws:

SAXException

endPrefixMapping

public void endPrefixMapping(String prefix)
                      throws SAXException

Specified by:

endPrefixMapping in interface ContentHandler

Throws:

SAXException

startElement

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

Specified by:

startElement in interface ContentHandler

Throws:

SAXException

endElement

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

Specified by:

endElement in interface ContentHandler

Throws:

SAXException

characters

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

Specified by:

characters in interface ContentHandler

Throws:

SAXException

ignorableWhitespace

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

Specified by:

ignorableWhitespace in interface ContentHandler

Throws:

SAXException

processingInstruction

public void processingInstruction(String target,
                                  String data)
                           throws SAXException

Specified by:

processingInstruction in interface ContentHandler

Throws:

SAXException

skippedEntity

public void skippedEntity(String name)
                   throws SAXException

Specified by:

skippedEntity in interface ContentHandler

Throws:

SAXException