org.apache.xerces.dom
Class DOMNormalizer

java.lang.Object
  |
  +--org.apache.xerces.dom.DOMNormalizer

All Implemented Interfaces:

org.apache.xerces.xni.XMLDocumentHandler

public class DOMNormalizer

extends java.lang.Object

implements org.apache.xerces.xni.XMLDocumentHandler

This class adds implementation for normalizeDocument method. It acts as if the document was going through a save and load cycle, putting the document in a "normal" form. The actual result depends on the features being set and governing what operations actually take place. See setNormalizationFeature for details. Noticeably this method normalizes Text nodes, makes the document "namespace wellformed", according to the algorithm described below in pseudo code, by adding missing namespace declaration attributes and adding or changing namespace prefixes, updates the replacement tree of EntityReference nodes, normalizes attribute values, etc. Mutation events, when supported, are generated to reflect the changes occuring on the document. See Namespace normalization for details on how namespace declaration attributes and prefixes are normalized. NOTE: There is an initial support for DOM revalidation with XML Schema as a grammar. The tree might not be validated correctly if entityReferences, CDATA sections are present in the tree. The PSVI information is not exposed, normalized data (including element default content is not available).

EXPERIMENTAL:

This class should not be considered stable. It is likely to be altered or replaced in the future.

Version:

$Id: DOMNormalizer.java,v 1.62 2005/07/25 04:24:21 mrglavas Exp $

Author:

Elena Litani, IBM, Neeraj Bajaj, Sun Microsystems, inc.

Inner Class Summary

protected class

DOMNormalizer.XMLAttributesProxy

Field Summary

static java.lang.RuntimeException	abort If the user stops the process, this exception will be thrown.
protected static boolean	DEBUG Debug namespace fix up algorithm
protected static boolean	DEBUG_EVENTS Debug document handler events
protected static boolean	DEBUG_ND Debug normalize document
protected java.util.Vector	fAttributeList list of attributes
protected DOMNormalizer.XMLAttributesProxy	fAttrProxy
protected DOMConfigurationImpl	fConfiguration
protected org.w3c.dom.Node	fCurrentNode for setting the PSVI
protected CoreDocumentImpl	fDocument
protected org.w3c.dom.DOMErrorHandler	fErrorHandler error handler.
protected org.apache.xerces.xni.NamespaceContext	fLocalNSBinder Stores all namespace bindings on the current element
protected DOMLocatorImpl	fLocator DOM Locator - for namespace fixup algorithm
protected org.apache.xerces.xni.NamespaceContext	fNamespaceContext The namespace context of this document: stores namespaces in scope
protected boolean	fNamespaceValidation
protected boolean	fPSVI
protected org.apache.xerces.xni.QName	fQName
protected SymbolTable	fSymbolTable symbol table
protected RevalidationHandler	fValidationHandler Validation handler represents validator instance.
protected static java.lang.String	PREFIX prefix added by namespace fixup algorithm should follow a pattern "NS" + index

Constructor Summary

DOMNormalizer()

Method Summary

protected void	addNamespaceDecl(java.lang.String prefix, java.lang.String uri, ElementImpl element) Adds a namespace attribute or replaces the value of existing namespace attribute with the given prefix and value for URI.
void	characters(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs) Character content.
void	comment(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs) A comment.
void	doctypeDecl(java.lang.String rootElement, java.lang.String publicId, java.lang.String systemId, org.apache.xerces.xni.Augmentations augs) Notifies of the presence of the DOCTYPE line in the document.
void	emptyElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.XMLAttributes attributes, org.apache.xerces.xni.Augmentations augs) An empty element.
void	endCDATA(org.apache.xerces.xni.Augmentations augs) The end of a CDATA section.
void	endDocument(org.apache.xerces.xni.Augmentations augs) The end of the document.
void	endElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.Augmentations augs) The end of an element.
void	endGeneralEntity(java.lang.String name, org.apache.xerces.xni.Augmentations augs) This method notifies the end of a general entity.
protected void	expandEntityRef(org.w3c.dom.Node parent, org.w3c.dom.Node reference)
org.apache.xerces.xni.parser.XMLDocumentSource	getDocumentSource() Returns the document source.
void	ignorableWhitespace(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs) Ignorable whitespace.
static void	isAttrValueWF(org.w3c.dom.DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, org.w3c.dom.NamedNodeMap attributes, org.w3c.dom.Attr a, java.lang.String value, boolean xml11Version) NON-DOM: check if attribute value is well-formed
static void	isCDataWF(org.w3c.dom.DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, java.lang.String datavalue, boolean isXML11Version) Check if CDATA section is well-formed
static void	isCommentWF(org.w3c.dom.DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, java.lang.String datavalue, boolean isXML11Version) NON-DOM: check if value of the comment is well-formed
static void	isXMLCharWF(org.w3c.dom.DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, java.lang.String datavalue, boolean isXML11Version) NON-DOM: check for valid XML characters as per the XML version
protected void	namespaceFixUp(ElementImpl element, AttributeMap attributes)
protected void	normalizeDocument(CoreDocumentImpl document, DOMConfigurationImpl config) Normalizes document.
protected org.w3c.dom.Node	normalizeNode(org.w3c.dom.Node node) This method acts as if the document was going through a save and load cycle, putting the document in a "normal" form.
void	processingInstruction(java.lang.String target, org.apache.xerces.xni.XMLString data, org.apache.xerces.xni.Augmentations augs) A processing instruction.
static void	reportDOMError(org.w3c.dom.DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, java.lang.String message, short severity, java.lang.String type) Reports a DOM error to the user handler.
void	setDocumentSource(org.apache.xerces.xni.parser.XMLDocumentSource source) Sets the document source.
void	startCDATA(org.apache.xerces.xni.Augmentations augs) The start of a CDATA section.
void	startDocument(org.apache.xerces.xni.XMLLocator locator, java.lang.String encoding, org.apache.xerces.xni.NamespaceContext namespaceContext, org.apache.xerces.xni.Augmentations augs) The start of the document.
void	startElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.XMLAttributes attributes, org.apache.xerces.xni.Augmentations augs) The start of an element.
void	startGeneralEntity(java.lang.String name, org.apache.xerces.xni.XMLResourceIdentifier identifier, java.lang.String encoding, org.apache.xerces.xni.Augmentations augs) This method notifies the start of a general entity.
void	textDecl(java.lang.String version, java.lang.String encoding, org.apache.xerces.xni.Augmentations augs) Notifies of the presence of a TextDecl line in an entity.
protected void	updateQName(org.w3c.dom.Node node, org.apache.xerces.xni.QName qname)
void	xmlDecl(java.lang.String version, java.lang.String encoding, java.lang.String standalone, org.apache.xerces.xni.Augmentations augs) Notifies of the presence of an XMLDecl line in the document.

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG_ND

protected static final boolean DEBUG_ND

Debug normalize document

DEBUG

protected static final boolean DEBUG

Debug namespace fix up algorithm

DEBUG_EVENTS

protected static final boolean DEBUG_EVENTS

Debug document handler events

PREFIX

protected static final java.lang.String PREFIX

prefix added by namespace fixup algorithm should follow a pattern "NS" + index

fConfiguration

protected DOMConfigurationImpl fConfiguration

fDocument

protected CoreDocumentImpl fDocument

fAttrProxy

protected final DOMNormalizer.XMLAttributesProxy fAttrProxy

fQName

protected final org.apache.xerces.xni.QName fQName

fValidationHandler

protected RevalidationHandler fValidationHandler

Validation handler represents validator instance.

fSymbolTable

protected SymbolTable fSymbolTable

symbol table

fErrorHandler

protected org.w3c.dom.DOMErrorHandler fErrorHandler

error handler. may be null.

fNamespaceValidation

protected boolean fNamespaceValidation

fPSVI

protected boolean fPSVI

fNamespaceContext

protected final org.apache.xerces.xni.NamespaceContext fNamespaceContext

The namespace context of this document: stores namespaces in scope

fLocalNSBinder

protected final org.apache.xerces.xni.NamespaceContext fLocalNSBinder

Stores all namespace bindings on the current element

fAttributeList

protected final java.util.Vector fAttributeList

list of attributes

fLocator

protected final DOMLocatorImpl fLocator

DOM Locator - for namespace fixup algorithm

fCurrentNode

protected org.w3c.dom.Node fCurrentNode

for setting the PSVI

abort

public static final java.lang.RuntimeException abort

If the user stops the process, this exception will be thrown.

Constructor Detail

DOMNormalizer

public DOMNormalizer()

Method Detail

normalizeDocument

protected void normalizeDocument(CoreDocumentImpl document,
                                 DOMConfigurationImpl config)

Normalizes document. Note: reset() must be called before this method.

normalizeNode

protected org.w3c.dom.Node normalizeNode(org.w3c.dom.Node node)

This method acts as if the document was going through a save and load cycle, putting the document in a "normal" form. The actual result depends on the features being set and governing what operations actually take place. See setNormalizationFeature for details. Noticeably this method normalizes Text nodes, makes the document "namespace wellformed", according to the algorithm described below in pseudo code, by adding missing namespace declaration attributes and adding or changing namespace prefixes, updates the replacement tree of EntityReference nodes,normalizes attribute values, etc.

Parameters:

node - Modified node or null. If node is returned, we need to normalize again starting on the node returned.

Returns:

the normalized Node

expandEntityRef

protected final void expandEntityRef(org.w3c.dom.Node parent,
                                     org.w3c.dom.Node reference)

namespaceFixUp

protected final void namespaceFixUp(ElementImpl element,
                                    AttributeMap attributes)

addNamespaceDecl

protected final void addNamespaceDecl(java.lang.String prefix,
                                      java.lang.String uri,
                                      ElementImpl element)

Adds a namespace attribute or replaces the value of existing namespace attribute with the given prefix and value for URI. In case prefix is empty will add/update default namespace declaration.

Parameters:

prefix -

uri -

Throws:

java.io.IOException -

isCDataWF

public static final void isCDataWF(org.w3c.dom.DOMErrorHandler errorHandler,
                                   DOMErrorImpl error,
                                   DOMLocatorImpl locator,
                                   java.lang.String datavalue,
                                   boolean isXML11Version)

Check if CDATA section is well-formed

Parameters:

datavalue -

isXML11Version - = true if XML 1.1

isXMLCharWF

public static final void isXMLCharWF(org.w3c.dom.DOMErrorHandler errorHandler,
                                     DOMErrorImpl error,
                                     DOMLocatorImpl locator,
                                     java.lang.String datavalue,
                                     boolean isXML11Version)

NON-DOM: check for valid XML characters as per the XML version

Parameters:

datavalue -

isXML11Version - = true if XML 1.1

isCommentWF

public static final void isCommentWF(org.w3c.dom.DOMErrorHandler errorHandler,
                                     DOMErrorImpl error,
                                     DOMLocatorImpl locator,
                                     java.lang.String datavalue,
                                     boolean isXML11Version)

NON-DOM: check if value of the comment is well-formed

Parameters:

datavalue -

isXML11Version - = true if XML 1.1

isAttrValueWF

public static final void isAttrValueWF(org.w3c.dom.DOMErrorHandler errorHandler,
                                       DOMErrorImpl error,
                                       DOMLocatorImpl locator,
                                       org.w3c.dom.NamedNodeMap attributes,
                                       org.w3c.dom.Attr a,
                                       java.lang.String value,
                                       boolean xml11Version)

NON-DOM: check if attribute value is well-formed

Parameters:

attributes -

a -

value -

reportDOMError

public static final void reportDOMError(org.w3c.dom.DOMErrorHandler errorHandler,
                                        DOMErrorImpl error,
                                        DOMLocatorImpl locator,
                                        java.lang.String message,
                                        short severity,
                                        java.lang.String type)

Reports a DOM error to the user handler. If the error is fatal, the processing will be always aborted.

updateQName

protected final void updateQName(org.w3c.dom.Node node,
                                 org.apache.xerces.xni.QName qname)

startDocument

public void startDocument(org.apache.xerces.xni.XMLLocator locator,
                          java.lang.String encoding,
                          org.apache.xerces.xni.NamespaceContext namespaceContext,
                          org.apache.xerces.xni.Augmentations augs)
                   throws org.apache.xerces.xni.XNIException

The start of the document.

Specified by:

startDocument in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

locator - The document locator, or null if the document location cannot be reported during the parsing of this document. However, it is strongly recommended that a locator be supplied that can at least report the system identifier of the document.

encoding - The auto-detected IANA encoding name of the entity stream. This value will be null in those situations where the entity encoding is not auto-detected (e.g. internal entities or a document entity that is parsed from a java.io.Reader).

namespaceContext - The namespace context in effect at the start of this document. This object represents the current context. Implementors of this class are responsible for copying the namespace bindings from the the current context (and its parent contexts) if that information is important.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

xmlDecl

public void xmlDecl(java.lang.String version,
                    java.lang.String encoding,
                    java.lang.String standalone,
                    org.apache.xerces.xni.Augmentations augs)
             throws org.apache.xerces.xni.XNIException

Notifies of the presence of an XMLDecl line in the document. If present, this method will be called immediately following the startDocument call.

Specified by:

xmlDecl in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

version - The XML version.

encoding - The IANA encoding name of the document, or null if not specified.

standalone - The standalone value, or null if not specified.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

doctypeDecl

public void doctypeDecl(java.lang.String rootElement,
                        java.lang.String publicId,
                        java.lang.String systemId,
                        org.apache.xerces.xni.Augmentations augs)
                 throws org.apache.xerces.xni.XNIException

Notifies of the presence of the DOCTYPE line in the document.

Specified by:

doctypeDecl in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

rootElement - The name of the root element.

publicId - The public identifier if an external DTD or null if the external DTD is specified using SYSTEM.

systemId - The system identifier if an external DTD, null otherwise.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

comment

public void comment(org.apache.xerces.xni.XMLString text,
                    org.apache.xerces.xni.Augmentations augs)
             throws org.apache.xerces.xni.XNIException

A comment.

Specified by:

comment in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

text - The text in the comment.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by application to signal an error.

processingInstruction

public void processingInstruction(java.lang.String target,
                                  org.apache.xerces.xni.XMLString data,
                                  org.apache.xerces.xni.Augmentations augs)
                           throws org.apache.xerces.xni.XNIException

A processing instruction. Processing instructions consist of a target name and, optionally, text data. The data is only meaningful to the application.

Typically, a processing instruction's data will contain a series of pseudo-attributes. These pseudo-attributes follow the form of element attributes but are not parsed or presented to the application as anything other than text. The application is responsible for parsing the data.

Specified by:

processingInstruction in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

target - The target.

data - The data or null if none specified.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

startElement

public void startElement(org.apache.xerces.xni.QName element,
                         org.apache.xerces.xni.XMLAttributes attributes,
                         org.apache.xerces.xni.Augmentations augs)
                  throws org.apache.xerces.xni.XNIException

The start of an element.

Specified by:

startElement in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

element - The name of the element.

attributes - The element attributes.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

emptyElement

public void emptyElement(org.apache.xerces.xni.QName element,
                         org.apache.xerces.xni.XMLAttributes attributes,
                         org.apache.xerces.xni.Augmentations augs)
                  throws org.apache.xerces.xni.XNIException

An empty element.

Specified by:

emptyElement in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

element - The name of the element.

attributes - The element attributes.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

startGeneralEntity

public void startGeneralEntity(java.lang.String name,
                               org.apache.xerces.xni.XMLResourceIdentifier identifier,
                               java.lang.String encoding,
                               org.apache.xerces.xni.Augmentations augs)
                        throws org.apache.xerces.xni.XNIException

This method notifies the start of a general entity.

Note: This method is not called for entity references appearing as part of attribute values.

Specified by:

startGeneralEntity in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

name - The name of the general entity.

identifier - The resource identifier.

encoding - The auto-detected IANA encoding name of the entity stream. This value will be null in those situations where the entity encoding is not auto-detected (e.g. internal entities or a document entity that is parsed from a java.io.Reader).

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

textDecl

public void textDecl(java.lang.String version,
                     java.lang.String encoding,
                     org.apache.xerces.xni.Augmentations augs)
              throws org.apache.xerces.xni.XNIException

Notifies of the presence of a TextDecl line in an entity. If present, this method will be called immediately following the startEntity call.

Note: This method will never be called for the document entity; it is only called for external general entities referenced in document content.

Note: This method is not called for entity references appearing as part of attribute values.

Specified by:

textDecl in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

version - The XML version, or null if not specified.

encoding - The IANA encoding name of the entity.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

endGeneralEntity

public void endGeneralEntity(java.lang.String name,
                             org.apache.xerces.xni.Augmentations augs)
                      throws org.apache.xerces.xni.XNIException

This method notifies the end of a general entity.

Note: This method is not called for entity references appearing as part of attribute values.

Specified by:

endGeneralEntity in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

name - The name of the entity.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

characters

public void characters(org.apache.xerces.xni.XMLString text,
                       org.apache.xerces.xni.Augmentations augs)
                throws org.apache.xerces.xni.XNIException

Character content.

Specified by:

characters in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

text - The content.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

ignorableWhitespace

public void ignorableWhitespace(org.apache.xerces.xni.XMLString text,
                                org.apache.xerces.xni.Augmentations augs)
                         throws org.apache.xerces.xni.XNIException

Ignorable whitespace. For this method to be called, the document source must have some way of determining that the text containing only whitespace characters should be considered ignorable. For example, the validator can determine if a length of whitespace characters in the document are ignorable based on the element content model.

Specified by:

ignorableWhitespace in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

text - The ignorable whitespace.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

endElement

public void endElement(org.apache.xerces.xni.QName element,
                       org.apache.xerces.xni.Augmentations augs)
                throws org.apache.xerces.xni.XNIException

The end of an element.

Specified by:

endElement in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

element - The name of the element.

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

startCDATA

public void startCDATA(org.apache.xerces.xni.Augmentations augs)
                throws org.apache.xerces.xni.XNIException

The start of a CDATA section.

Specified by:

startCDATA in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

endCDATA

public void endCDATA(org.apache.xerces.xni.Augmentations augs)
              throws org.apache.xerces.xni.XNIException

The end of a CDATA section.

Specified by:

endCDATA in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

endDocument

public void endDocument(org.apache.xerces.xni.Augmentations augs)
                 throws org.apache.xerces.xni.XNIException

The end of the document.

Specified by:

endDocument in interface org.apache.xerces.xni.XMLDocumentHandler

Parameters:

augs - Additional information that may include infoset augmentations

Throws:

org.apache.xerces.xni.XNIException - Thrown by handler to signal an error.

setDocumentSource

public void setDocumentSource(org.apache.xerces.xni.parser.XMLDocumentSource source)

Sets the document source.

Specified by:

setDocumentSource in interface org.apache.xerces.xni.XMLDocumentHandler

getDocumentSource

public org.apache.xerces.xni.parser.XMLDocumentSource getDocumentSource()

Returns the document source.

Specified by:

getDocumentSource in interface org.apache.xerces.xni.XMLDocumentHandler