org.apache.xalan.processor
Class StylesheetHandler

java.lang.Object
  org.xml.sax.helpers.DefaultHandler
      org.apache.xalan.processor.StylesheetHandler

All Implemented Interfaces:

ContentHandler, DTDHandler, EntityResolver, ErrorHandler, NodeConsumer, PrefixResolver, TemplatesHandler

public class StylesheetHandler

extends DefaultHandler

implements TemplatesHandler, PrefixResolver, NodeConsumer

Initializes and processes a stylesheet via SAX events. This class acts as essentially a state machine, maintaining a ContentHandler stack, and pushing appropriate content handlers as parse events occur.

Constructor Summary

StylesheetHandler(TransformerFactoryImpl processor)
Create a StylesheetHandler object, creating a root stylesheet as the target.

Method Summary

void	characters(char[] ch, int start, int length) Receive notification of character data inside an element.
XPath	createXPath(java.lang.String str, ElemTemplateElement owningTemplate) Process an expression string into an XPath.
void	endDocument() Receive notification of the end of the document.
void	endElement(java.lang.String uri, java.lang.String localName, java.lang.String rawName) Receive notification of the end of an element.
void	endPrefixMapping(java.lang.String prefix) Receive notification of the end of a Namespace mapping.
void	error(SAXParseException e) Receive notification of a recoverable XSLT processing error.
void	fatalError(SAXParseException e) Report a fatal XSLT processing error.
java.lang.String	getBaseIdentifier() Return the base identifier.
SAXSourceLocator	getLocator() Get the current stylesheet Locator object.
java.lang.String	getNamespaceForPrefix(java.lang.String prefix) Given a namespace, get the corrisponding prefix from the current namespace support context.
java.lang.String	getNamespaceForPrefix(java.lang.String prefix, Node context) Given a namespace, get the corrisponding prefix.
Node	getOriginatingNode() Set the node that is originating the SAX event.
StylesheetRoot	getStylesheetRoot() Return the stylesheet root that this handler is constructing.
java.lang.String	getSystemId() Get the base ID (URI or system ID) from where relative URLs will be resolved.
Templates	getTemplates() When this object is used as a ContentHandler or ContentHandler, it will create a Templates object, which the caller can get once the SAX events have been completed.
boolean	handlesNullPrefixes()
void	ignorableWhitespace(char[] ch, int start, int length) Receive notification of ignorable whitespace in element content.
boolean	isStylesheetParsingComplete() Test whether the _last_ endDocument() has been processed.
void	notationDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId) Receive notification of a notation declaration.
void	processingInstruction(java.lang.String target, java.lang.String data) Receive notification of a processing instruction.
void	pushStylesheet(Stylesheet s) Push the current stylesheet being constructed.
InputSource	resolveEntity(java.lang.String publicId, java.lang.String systemId) Resolve an external entity.
void	setDocumentLocator(Locator locator) Receive a Locator object for document events.
void	setOriginatingNode(Node n) Set the node that is originating the SAX event.
void	setSystemId(java.lang.String baseID) Set the base ID (URL or system ID) for the stylesheet created by this builder.
void	skippedEntity(java.lang.String name) Receive notification of a skipped entity.
void	startDocument() Receive notification of the beginning of the document.
void	startElement(java.lang.String uri, java.lang.String localName, java.lang.String rawName, Attributes attributes) Receive notification of the start of an element.
void	startPrefixMapping(java.lang.String prefix, java.lang.String uri) Receive notification of the start of a Namespace mapping.
void	unparsedEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId, java.lang.String notationName) Receive notification of an unparsed entity declaration.
void	warn(java.lang.String msg, java.lang.Object[] args) Warn the user of an problem.
void	warning(SAXParseException e) Receive notification of a XSLT processing warning.

Methods inherited from class java.lang.Object

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

Constructor Detail

StylesheetHandler

public StylesheetHandler(TransformerFactoryImpl processor)
                  throws TransformerConfigurationException

Create a StylesheetHandler object, creating a root stylesheet as the target.

Parameters:

processor - non-null reference to the transformer factory that owns this handler.

Throws:

TransformerConfigurationException - if a StylesheetRoot can not be constructed for some reason.

Method Detail

createXPath

public XPath createXPath(java.lang.String str,
                         ElemTemplateElement owningTemplate)
                  throws TransformerException

Process an expression string into an XPath. Must be public for access by the AVT class.

Parameters:

str - A non-null reference to a valid or invalid XPath expression string.

Returns:

A non-null reference to an XPath object that represents the string argument.

Throws:

TransformerException - if the expression can not be processed.

See Also:

Section 4 Expressions in XSLT Specification

getNamespaceForPrefix

public java.lang.String getNamespaceForPrefix(java.lang.String prefix)

Given a namespace, get the corrisponding prefix from the current namespace support context.

Specified by:

getNamespaceForPrefix in interface PrefixResolver

Parameters:

prefix - The prefix to look up, which may be an empty string ("") for the default Namespace.

Returns:

The associated Namespace URI, or null if the prefix is undeclared in this context.

getNamespaceForPrefix

public java.lang.String getNamespaceForPrefix(java.lang.String prefix,
                                              Node context)

Given a namespace, get the corrisponding prefix. This is here only to support the PrefixResolver interface, and will throw an error if invoked on this object.

Specified by:

getNamespaceForPrefix in interface PrefixResolver

Parameters:

prefix - The prefix to look up, which may be an empty string ("") for the default Namespace.

context - The node context from which to look up the URI.

Returns:

The associated Namespace URI, or null if the prefix is undeclared in this context.

getTemplates

public Templates getTemplates()

When this object is used as a ContentHandler or ContentHandler, it will create a Templates object, which the caller can get once the SAX events have been completed.

Specified by:

getTemplates in interface TemplatesHandler

Returns:

The stylesheet object that was created during the SAX event process, or null if no stylesheet has been created. Author Scott Boag

setSystemId

public void setSystemId(java.lang.String baseID)

Set the base ID (URL or system ID) for the stylesheet created by this builder. This must be set in order to resolve relative URLs in the stylesheet.

Specified by:

setSystemId in interface TemplatesHandler

Parameters:

baseID - Base URL for this stylesheet.

getSystemId

public java.lang.String getSystemId()

Get the base ID (URI or system ID) from where relative URLs will be resolved.

Specified by:

getSystemId in interface TemplatesHandler

Returns:

The systemID that was set with setSystemId(java.lang.String).

resolveEntity

public InputSource resolveEntity(java.lang.String publicId,
                                 java.lang.String systemId)
                          throws SAXException

Resolve an external entity.

Specified by:

resolveEntity in interface EntityResolver

Overrides:

resolveEntity in class DefaultHandler

Parameters:

publicId - The public identifer, or null if none is available.

systemId - The system identifier provided in the XML document.

Returns:

The new input source, or null to require the default behaviour.

Throws:

SAXException - if the entity can not be resolved.

See Also:

EntityResolver.resolveEntity(java.lang.String, java.lang.String)

notationDecl

public void notationDecl(java.lang.String name,
                         java.lang.String publicId,
                         java.lang.String systemId)

Receive notification of a notation declaration.

By default, do nothing. Application writers may override this method in a subclass if they wish to keep track of the notations declared in a document.

Specified by:

notationDecl in interface DTDHandler

Overrides:

notationDecl in class DefaultHandler

Parameters:

name - The notation name.

publicId - The notation public identifier, or null if not available.

systemId - The notation system identifier.

See Also:

DTDHandler.notationDecl(java.lang.String, java.lang.String, java.lang.String)

unparsedEntityDecl

public void unparsedEntityDecl(java.lang.String name,
                               java.lang.String publicId,
                               java.lang.String systemId,
                               java.lang.String notationName)

Receive notification of an unparsed entity declaration.

Specified by:

unparsedEntityDecl in interface DTDHandler

Overrides:

unparsedEntityDecl in class DefaultHandler

Parameters:

name - The entity name.

publicId - The entity public identifier, or null if not available.

systemId - The entity system identifier.

notationName - The name of the associated notation.

See Also:

DTDHandler.unparsedEntityDecl(java.lang.String, java.lang.String, java.lang.String, java.lang.String)

setDocumentLocator

public void setDocumentLocator(Locator locator)

Receive a Locator object for document events. This is called by the parser to push a locator for the stylesheet being parsed. The stack needs to be popped after the stylesheet has been parsed. We pop in popStylesheet.

Specified by:

setDocumentLocator in interface ContentHandler

Overrides:

setDocumentLocator in class DefaultHandler

Parameters:

locator - A locator for all SAX document events.

See Also:

ContentHandler.setDocumentLocator(org.xml.sax.Locator), Locator

startDocument

public void startDocument()
                   throws SAXException

Receive notification of the beginning of the document.

Specified by:

startDocument in interface ContentHandler

Overrides:

startDocument in class DefaultHandler

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.startDocument()

isStylesheetParsingComplete

public boolean isStylesheetParsingComplete()

Test whether the _last_ endDocument() has been processed. This is needed as guidance for stylesheet optimization and compilation engines, which generally don't want to start until all included and imported stylesheets have been fully parsed.

Returns:

true iff the complete stylesheet tree has been built.

endDocument

public void endDocument()
                 throws SAXException

Receive notification of the end of the document.

Specified by:

endDocument in interface ContentHandler

Overrides:

endDocument in class DefaultHandler

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.endDocument()

startPrefixMapping

public void startPrefixMapping(java.lang.String prefix,
                               java.lang.String uri)
                        throws SAXException

Receive notification of the start of a Namespace mapping.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).

Specified by:

startPrefixMapping in interface ContentHandler

Overrides:

startPrefixMapping in class DefaultHandler

Parameters:

prefix - The Namespace prefix being declared.

uri - The Namespace URI mapped to the prefix.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.startPrefixMapping(java.lang.String, java.lang.String)

endPrefixMapping

public void endPrefixMapping(java.lang.String prefix)
                      throws SAXException

Receive notification of the end of a Namespace mapping.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).

Specified by:

endPrefixMapping in interface ContentHandler

Overrides:

endPrefixMapping in class DefaultHandler

Parameters:

prefix - The Namespace prefix being declared.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.endPrefixMapping(java.lang.String)

startElement

public void startElement(java.lang.String uri,
                         java.lang.String localName,
                         java.lang.String rawName,
                         Attributes attributes)
                  throws SAXException

Receive notification of the start of an element.

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class DefaultHandler

Parameters:

uri - The Namespace URI, or an empty string.

localName - The local name (without prefix), or empty string if not namespace processing.

rawName - The qualified name (with prefix).

attributes - The specified or defaulted attributes.

Throws:

SAXException

See Also:

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

endElement

public void endElement(java.lang.String uri,
                       java.lang.String localName,
                       java.lang.String rawName)
                throws SAXException

Receive notification of the end of an element.

Specified by:

endElement in interface ContentHandler

Overrides:

endElement in class DefaultHandler

Parameters:

uri - The Namespace URI, or an empty string.

localName - The local name (without prefix), or empty string if not namespace processing.

rawName - The qualified name (with prefix).

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.endElement(java.lang.String, java.lang.String, java.lang.String)

characters

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

Receive notification of character data inside an element.

Specified by:

characters in interface ContentHandler

Overrides:

characters in class DefaultHandler

Parameters:

ch - The characters.

start - The start position in the character array.

length - The number of characters to use from the character array.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.characters(char[], int, int)

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

Overrides:

ignorableWhitespace in class DefaultHandler

Parameters:

ch - The whitespace characters.

start - The start position in the character array.

length - The number of characters to use from the character array.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.ignorableWhitespace(char[], int, int)

processingInstruction

public void processingInstruction(java.lang.String target,
                                  java.lang.String data)
                           throws SAXException

Receive notification of a processing instruction.

The Parser will invoke this method once for each processing instruction found: note that processing instructions may occur before or after the main document element.

A SAX parser should never report an XML declaration (XML 1.0, section 2.8) or a text declaration (XML 1.0, section 4.3.1) using this method.

By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.

Specified by:

processingInstruction in interface ContentHandler

Overrides:

processingInstruction in class DefaultHandler

Parameters:

target - The processing instruction target.

data - The processing instruction data, or null if none is supplied.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.processingInstruction(java.lang.String, java.lang.String)

skippedEntity

public void skippedEntity(java.lang.String name)
                   throws SAXException

Receive notification of a skipped entity.

By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.

Specified by:

skippedEntity in interface ContentHandler

Overrides:

skippedEntity in class DefaultHandler

Parameters:

name - The name of the skipped entity.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

ContentHandler.processingInstruction(java.lang.String, java.lang.String)

warn

public void warn(java.lang.String msg,
                 java.lang.Object[] args)
          throws SAXException

Warn the user of an problem.

Parameters:

msg - An key into the XSLTErrorResources table, that is one of the WG_ prefixed definitions.

args - An array of arguments for the given warning.

Throws:

SAXException - that wraps a TransformerException if the current ErrorListener.warning(javax.xml.transform.TransformerException) method chooses to flag this condition as an error.

warning

public void warning(SAXParseException e)
             throws SAXException

Receive notification of a XSLT processing warning.

Specified by:

warning in interface ErrorHandler

Overrides:

warning in class DefaultHandler

Parameters:

e - The warning information encoded as an exception.

Throws:

SAXException - that wraps a TransformerException if the current ErrorListener.warning(javax.xml.transform.TransformerException) method chooses to flag this condition as an error.

See Also:

ErrorHandler.warning(org.xml.sax.SAXParseException), SAXParseException

error

public void error(SAXParseException e)
           throws SAXException

Receive notification of a recoverable XSLT processing error.

Specified by:

error in interface ErrorHandler

Overrides:

error in class DefaultHandler

Parameters:

e - The error information encoded as an exception.

Throws:

SAXException - that wraps a TransformerException if the current ErrorListener.error(javax.xml.transform.TransformerException) method chooses to flag this condition as an error.

See Also:

ErrorHandler.warning(org.xml.sax.SAXParseException), SAXParseException

fatalError

public void fatalError(SAXParseException e)
                throws SAXException

Report a fatal XSLT processing error.

Specified by:

fatalError in interface ErrorHandler

Overrides:

fatalError in class DefaultHandler

Parameters:

e - The error information encoded as an exception.

Throws:

SAXException - that wraps a TransformerException if the current ErrorListener.fatalError(javax.xml.transform.TransformerException) method chooses to flag this condition as an error.

See Also:

ErrorHandler.fatalError(org.xml.sax.SAXParseException), SAXParseException

getStylesheetRoot

public StylesheetRoot getStylesheetRoot()

Return the stylesheet root that this handler is constructing.

Returns:

The root stylesheet of the stylesheets tree.

pushStylesheet

public void pushStylesheet(Stylesheet s)

Push the current stylesheet being constructed. If no other stylesheets have been pushed onto the stack, assume the argument is a stylesheet root, and also set the stylesheet root member.

Parameters:

s - non-null reference to a stylesheet.

getBaseIdentifier

public java.lang.String getBaseIdentifier()

Return the base identifier.

Specified by:

getBaseIdentifier in interface PrefixResolver

Returns:

The base identifier of the current stylesheet.

getLocator

public SAXSourceLocator getLocator()

Get the current stylesheet Locator object.

Returns:

non-null reference to the current locator object.

setOriginatingNode

public void setOriginatingNode(Node n)

Set the node that is originating the SAX event.

Specified by:

setOriginatingNode in interface NodeConsumer

Parameters:

n - Reference to node that originated the current event.

See Also:

NodeConsumer

getOriginatingNode

public Node getOriginatingNode()

Set the node that is originating the SAX event.

Returns:

Reference to node that originated the current event.

See Also:

NodeConsumer

handlesNullPrefixes

public boolean handlesNullPrefixes()

Specified by:

handlesNullPrefixes in interface PrefixResolver

See Also:

PrefixResolver.handlesNullPrefixes()