org.apache.xalan.processor
Class StylesheetHandler

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

public class StylesheetHandler

extends DefaultHandler

implements TemplatesHandler, PrefixResolver, NodeConsumer

**For advanced use only** 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) **For internal use only** 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.

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.

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.

Overrides:

resolveEntity in class DefaultHandler

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.

Parameters:

name - The notation name.

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

systemId - The notation system identifier.

Overrides:

notationDecl in class DefaultHandler

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.

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.

Overrides:

unparsedEntityDecl in class DefaultHandler

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.

Parameters:

locator - A locator for all SAX document events.

Overrides:

setDocumentLocator in class DefaultHandler

See Also:

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

startDocument

public void startDocument()
                   throws SAXException

Receive notification of the beginning of the document.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

Overrides:

startDocument in class DefaultHandler

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.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

Overrides:

endDocument in class DefaultHandler

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).

Parameters:

prefix - The Namespace prefix being declared.

uri - The Namespace URI mapped to the prefix.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

Overrides:

startPrefixMapping in class DefaultHandler

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).

Parameters:

prefix - The Namespace prefix being declared.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

Overrides:

endPrefixMapping in class DefaultHandler

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.

Parameters:

name - The element type name.

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 -

Overrides:

startElement in class DefaultHandler

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.

Parameters:

name - The element type name.

attributes - The specified or defaulted attributes.

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.

Overrides:

endElement in class DefaultHandler

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.

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.

Overrides:

characters in class DefaultHandler

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.

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.

Overrides:

ignorableWhitespace in class DefaultHandler

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.

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.

Overrides:

processingInstruction in class DefaultHandler

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.

Parameters:

name - The name of the skipped entity.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

Overrides:

skippedEntity in class DefaultHandler

See Also:

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

warn

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

**For internal use only** 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.

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.

Overrides:

warning in class DefaultHandler

error

public void error(SAXParseException e)
           throws SAXException

Receive notification of a recoverable XSLT processing error.

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.

Overrides:

error in class DefaultHandler

fatalError

public void fatalError(SAXParseException e)
                throws SAXException

Report a fatal XSLT processing error.

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.

Overrides:

fatalError in class DefaultHandler

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()