com.saxonica.jaxp
Class ValidatorHandlerImpl

java.lang.Object
  javax.xml.validation.ValidatorHandler
      com.saxonica.jaxp.ValidatorHandlerImpl

All Implemented Interfaces:

ContentHandler, DTDHandler, LexicalHandler

public class ValidatorHandlerImpl
extends ValidatorHandler
implements ContentHandler, LexicalHandler, DTDHandler

The is the Saxon implementation of the JAXP 1.3 ValidatorHandler interface. It is a SAX ContentHandler that accepts events from an XML parser (or elsewhere), validates them, reports any errors, and passes the events on to another ContentHandler. The events that are passed on will be augmented with extra elements and attributes that expand default values defined in the schema. In addition, the receiving ContentHandler has access to a TypeInfoProvider that gives information about the type of the current element or attribute event.

A ValidatorHandler is the front end to a rather complex pipeline. The ValidatorHandler is the first stage in the pipeline: it receives events from a SAX parser or other source of SAX events. The next stage is a ReceivingContentHandler, which translates SAX events into Receiver events. This is followed by a number of Receivers to do the validation (actually a stack of Receivers, since a new ComplexContentValidator is added each time a new element starts). The last Receiver is the finalProxy: this translates Receiver events back into SAX2 events, for delivery to the user's ContentHandler.

The user's ContentHandler has access to a TypeInfoProvider that gives information about the types of elements and attributes. This information is passed down the Receiver pipeline in the form of typeCodes associated with element and attribute events. The TypeInfoProvider is part of the finalProxy, which saves the type information locally and returns it to the user's ContentHandler on request. The TypeInfo objects supplied by the TypeInfoProvider are in fact the schema components representing the type, as a SchemaType object.

Constructor Summary

ValidatorHandlerImpl()

Method Summary

void	characters(char[] ch, int start, int length) Receive notification of character data.
void	comment(char[] ch, int start, int length) Report an XML comment anywhere in the document.
void	endCDATA() Report the end of a CDATA section.
void	endDocument() Receive notification of the end of a document.
void	endDTD() Report the end of DTD declarations.
void	endElement(String uri, String localName, String qName) Receive notification of the end of an element.
void	endEntity(String name) Report the end of an entity.
void	endPrefixMapping(String prefix) End the scope of a prefix-URI mapping.
SchemaAwareConfiguration	getConfiguration() Get the Configuration object
ContentHandler	getContentHandler() Gets the ContentHandler which receives the augmented validation result.
ErrorHandler	getErrorHandler() Gets the current ErrorHandler
Object	getProperty(String name) Look up the value of a property.
LSResourceResolver	getResourceResolver() Gets the current LSResourceResolver
TypeInfoProvider	getTypeInfoProvider() Obtains the TypeInfoProvider implementation of this ValidatorHandler.
void	ignorableWhitespace(char[] ch, int start, int length) Receive notification of ignorable whitespace in element content.
void	notationDecl(String name, String publicId, String systemId) Receive notification of a notation declaration event.
void	processingInstruction(String target, String data) Receive notification of a processing instruction.
void	setContentHandler(ContentHandler receiver) Sets the ContentHandler which receives the augmented validation result.
void	setDocumentLocator(Locator locator) Receive an object for locating the origin of SAX document events.
void	setErrorHandler(ErrorHandler errorHandler) Sets the ErrorHandler to receive errors encountered during the validation.
void	setFinalProxy(TypedContentHandler proxy) Set the TypedContentHandler that acts as the final stage in this pipeline, receiving typed events from the validator stack
void	setPipelineConfiguration(PipelineConfiguration pipe) Set the pipeline configuration used by this validator handler
void	setProperty(String name, Object object) Set the value of a property.
void	setReceivingContentHandler(ReceivingContentHandler rch) Get the ReceivingContentHandler that receives the SAX events at the start of this pipeline
void	setResourceResolver(LSResourceResolver resourceResolver) Sets the LSResourceResolver to customize resource resolution while in a validation episode.
void	skippedEntity(String name) Receive notification of a skipped entity.
void	startCDATA() Report the start of a CDATA section.
void	startDocument() Receive notification of the beginning of a document.
void	startDTD(String name, String publicId, String systemId) Report the start of DTD declarations, if any.
void	startElement(String uri, String localName, String qName, Attributes atts) Receive notification of the beginning of an element.
void	startEntity(String name) Report the beginning of some internal and external XML entities.
void	startPrefixMapping(String prefix, String uri) Begin the scope of a prefix-URI Namespace mapping.
void	unparsedEntityDecl(String name, String publicId, String systemId, String notationName) Receive notification of an unparsed entity declaration event.

Methods inherited from class javax.xml.validation.ValidatorHandler

getFeature, setFeature

Methods inherited from class java.lang.Object

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

Constructor Detail

ValidatorHandlerImpl

public ValidatorHandlerImpl()

Method Detail

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration pipe)

Set the pipeline configuration used by this validator handler

Parameters:

pipe - the pipeline configuration

setReceivingContentHandler

public void setReceivingContentHandler(ReceivingContentHandler rch)

Get the ReceivingContentHandler that receives the SAX events at the start of this pipeline

Parameters:

rch - the ReceivingContentHandler

setFinalProxy

public void setFinalProxy(TypedContentHandler proxy)

Set the TypedContentHandler that acts as the final stage in this pipeline, receiving typed events from the validator stack

Parameters:

proxy - the TypedContentHandler at the end of the pipeline

setContentHandler

public void setContentHandler(ContentHandler receiver)

Sets the ContentHandler which receives the augmented validation result. A ValidatorHandler may buffer events to certain extent, but to allow ValidatorHandler to be used by a parser, the following requirement has to be met.

1. When ContentHandler.startElement(String, String, String, Attributes), ContentHandler.endElement(String, String, String), ContentHandler.startDocument(), or ContentHandler.endDocument() are invoked on a ValidatorHandler, the same method on the user-specified ContentHandler must be invoked for the same event before the callback returns.

   The Saxon implementation does not meet this requirement. StartElement events are buffered until the first thing following the attributes is encountered.

   Specified by:

   setContentHandler in class ValidatorHandler

   Parameters:

   receiver - A ContentHandler or a null value.

getContentHandler

public ContentHandler getContentHandler()

Gets the ContentHandler which receives the augmented validation result.

Specified by:

getContentHandler in class ValidatorHandler

Returns:

This method returns the object that was last set through the getContentHandler() method, or null if that method has never been called since this ValidatorHandler has created.

See Also:

setContentHandler(org.xml.sax.ContentHandler)

setErrorHandler

public void setErrorHandler(ErrorHandler errorHandler)

Sets the ErrorHandler to receive errors encountered during the validation.

Specified by:

setErrorHandler in class ValidatorHandler

Parameters:

errorHandler - A new error handler to be set. This parameter can be null.

getErrorHandler

public ErrorHandler getErrorHandler()

Gets the current ErrorHandler

Specified by:

getErrorHandler in class ValidatorHandler

Returns:

This method returns the object that was last set through the setErrorHandler(org.xml.sax.ErrorHandler) method, or null if that method has never been called

See Also:

setErrorHandler(org.xml.sax.ErrorHandler)

setResourceResolver

public void setResourceResolver(LSResourceResolver resourceResolver)

Sets the LSResourceResolver to customize resource resolution while in a validation episode.

Specified by:

setResourceResolver in class ValidatorHandler

Parameters:

resourceResolver - A new resource resolver to be set. This parameter can be null.

getResourceResolver

public LSResourceResolver getResourceResolver()

Gets the current LSResourceResolver

Specified by:

getResourceResolver in class ValidatorHandler

Returns:

This method returns the object that was last set through the setResourceResolver(org.w3c.dom.ls.LSResourceResolver) method, or null if that method has never been called

getTypeInfoProvider

public TypeInfoProvider getTypeInfoProvider()

Obtains the TypeInfoProvider implementation of this ValidatorHandler. The obtained TypeInfoProvider can be queried during a parse to access the type information determined by the validator.

Specified by:

getTypeInfoProvider in class ValidatorHandler

Returns:

A non-null valid TypeInfoProvider.

setDocumentLocator

public void setDocumentLocator(Locator locator)

Receive an object for locating the origin of SAX document events.

Specified by:

setDocumentLocator in interface ContentHandler

Parameters:

locator - an object that can return the location of any SAX document event

See Also:

Locator

getProperty

public Object getProperty(String name)
                   throws SAXNotRecognizedException,
                          SAXNotSupportedException

Look up the value of a property.

The property name is any fully-qualified URI. It is possible for a ValidatorHandler to recognize a property name but temporarily be unable to return its value. Some property values may be available only in specific contexts, such as before, during, or after a validation.

Validators are not required to recognize any specific property names.

In the Saxon implementation, the property names that are recognized are the same as the attribute names recognised by a TransformerFactory. These are listed as constant fields in the class FeatureKeys

Overrides:

getProperty in class ValidatorHandler

Parameters:

name - The property name, which is a non-null fully-qualified URI.

Returns:

The current value of the property.

Throws:

SAXNotRecognizedException - If the property value can't be assigned or retrieved.

SAXNotSupportedException - When the XMLReader recognizes the property name but cannot determine its value at this time.

NullPointerException - When the name parameter is null.

See Also:

setProperty(String, Object)

setProperty

public void setProperty(String name,
                        Object object)
                 throws SAXNotRecognizedException,
                        SAXNotSupportedException

Set the value of a property.

The property name is any fully-qualified URI. It is possible for a ValidatorHandler to recognize a property name but to be unable to change the current value. Some property values may be immutable or mutable only in specific contexts, such as before, during, or after a validation.

In the Saxon implementation, the property names that are recognized are the same as the attribute names recognised by a TransformerFactory. These are listed as constant fields in the class FeatureKeys

Overrides:

setProperty in class ValidatorHandler

Parameters:

name - The property name, which is a non-null fully-qualified URI.

object - The requested value for the property.

Throws:

SAXNotRecognizedException - If the property value can't be assigned or retrieved.

SAXNotSupportedException - When the Validator recognizes the property name but cannot set the requested value.

NullPointerException - When the name parameter is null.

getConfiguration

public SchemaAwareConfiguration getConfiguration()

Get the Configuration object

Returns:

the Configuration, which will always be schema-aware

startDocument

public void startDocument()
                   throws SAXException

Receive notification of the beginning of a document.

The SAX parser will invoke this method only once, before any other event callbacks (except for setDocumentLocator).

Specified by:

startDocument in interface ContentHandler

Throws:

SAXException - any SAX exception, possibly wrapping another exception

See Also:

endDocument()

endDocument

public void endDocument()
                 throws SAXException

Receive notification of the end of a document.

Specified by:

endDocument in interface ContentHandler

Throws:

SAXException - any SAX exception, possibly wrapping another exception

startPrefixMapping

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

Begin the scope of a prefix-URI Namespace mapping.

There should never be start/endPrefixMapping events for the "xml" prefix, since it is predeclared and immutable.

Specified by:

startPrefixMapping in interface ContentHandler

Parameters:

prefix - the Namespace prefix being declared. An empty string is used for the default element namespace, which has no prefix.

uri - the Namespace URI the prefix is mapped to

Throws:

SAXException - the client may throw an exception during processing

See Also:

endPrefixMapping(java.lang.String), startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)

endPrefixMapping

public void endPrefixMapping(String prefix)
                      throws SAXException

End the scope of a prefix-URI mapping.

Specified by:

endPrefixMapping in interface ContentHandler

Parameters:

prefix - the prefix that was being mapped. This is the empty string when a default mapping scope ends.

Throws:

SAXException - the client may throw an exception during processing

startElement

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

Receive notification of the beginning of an element.

Specified by:

startElement in interface ContentHandler

Parameters:

uri - the Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed

localName - the local name (without prefix), or the empty string if Namespace processing is not being performed

qName - the qualified name (with prefix), or the empty string if qualified names are not available

atts - the attributes attached to the element. If there are no attributes, it shall be an empty Attributes object. The value of this object after startElement returns is undefined

Throws:

SAXException - any SAX exception, possibly wrapping another exception

endElement

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

Receive notification of the end of an element.

Specified by:

endElement in interface ContentHandler

Throws:

SAXException

characters

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

Receive notification of character data.

Specified by:

characters in interface ContentHandler

Throws:

SAXException

ignorableWhitespace

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

Receive notification of ignorable whitespace in element content.

Specified by:

ignorableWhitespace in interface ContentHandler

Throws:

SAXException

processingInstruction

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

Receive notification of a processing instruction.

Specified by:

processingInstruction in interface ContentHandler

Throws:

SAXException

skippedEntity

public void skippedEntity(String name)
                   throws SAXException

Receive notification of a skipped entity.

Specified by:

skippedEntity in interface ContentHandler

Throws:

SAXException

startDTD

public void startDTD(String name,
                     String publicId,
                     String systemId)
              throws SAXException

Report the start of DTD declarations, if any.

Specified by:

startDTD in interface LexicalHandler

Throws:

SAXException

endDTD

public void endDTD()
            throws SAXException

Report the end of DTD declarations.

Specified by:

endDTD in interface LexicalHandler

Throws:

SAXException

startEntity

public void startEntity(String name)
                 throws SAXException

Report the beginning of some internal and external XML entities.

Specified by:

startEntity in interface LexicalHandler

Throws:

SAXException

endEntity

public void endEntity(String name)
               throws SAXException

Report the end of an entity.

Specified by:

endEntity in interface LexicalHandler

Throws:

SAXException

startCDATA

public void startCDATA()
                throws SAXException

Report the start of a CDATA section.

Specified by:

startCDATA in interface LexicalHandler

Throws:

SAXException

endCDATA

public void endCDATA()
              throws SAXException

Report the end of a CDATA section.

Specified by:

endCDATA in interface LexicalHandler

Throws:

SAXException

comment

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

Report an XML comment anywhere in the document.

Specified by:

comment in interface LexicalHandler

Throws:

SAXException

notationDecl

public void notationDecl(String name,
                         String publicId,
                         String systemId)
                  throws SAXException

Receive notification of a notation declaration event.

Specified by:

notationDecl in interface DTDHandler

Throws:

SAXException

unparsedEntityDecl

public void unparsedEntityDecl(String name,
                               String publicId,
                               String systemId,
                               String notationName)
                        throws SAXException

Receive notification of an unparsed entity declaration event.

Specified by:

unparsedEntityDecl in interface DTDHandler

Throws:

SAXException