WebLogic Server 6.1 API Reference

weblogic.apache.xerces.framework
Class XMLDocumentScanner

java.lang.Object
  |
  +--weblogic.apache.xerces.framework.XMLDocumentScanner

public final class XMLDocumentScanner

extends java.lang.Object

This class recognizes most of the grammer for an XML processor. Additional support is provided by the XMLEntityHandler, via the XMLEntityReader instances it creates, which are used to process simple constructs like string literals and character data between markup. The XMLDTDScanner class contains the remaining support for the grammer of DTD declarations. When a <!DOCTYPE ...> is found in the document, the scanDoctypeDecl method will then be called and the XMLDocumentScanner subclass is responsible for "connecting" that method to the corresponding method provided by the XMLDTDScanner class.

This class is based on an implementation from the Apache XML Project. In future releases the XML parser, XSLT processor, and associated classes will likely be updated to be based on a later version of the Apache implementations. Since Apache does not guarantee backwards compatibility between versions of their software, we cannot guarantee backwards compatibility of any of the classes contained in the weblogic.apache package or sub-packages.

Version:

$Id: XMLDocumentScanner.java,v 1.11 2001/02/23 23:49:15 lynnm Exp $

Inner Class Summary

static interface

XMLDocumentScanner.EventHandler This interface must be implemented by the users of the XMLDocumentScanner class.

Field Summary

static int	RESULT_DUPLICATE_ATTR
static int	RESULT_FAILURE
static int	RESULT_SUCCESS

Constructor Summary

XMLDocumentScanner(StringPool stringPool, XMLErrorReporter errorReporter, XMLEntityHandler entityHandler, XMLEntityHandler.CharBuffer literalData)
Constructor

Method Summary

boolean	atEndOfInput() Tell if scanner has reached end of input
void	checkXMLLangAttributeValue(int langValue) Check the value of an XML Language attribute
void	endOfInput(int entityName, boolean moreToFollow) Handle the end of input
int	getCurrentElementType()
boolean	getLoadExternalDTD() Returns true if loading the external DTD is turned on.
int	getMaxEntityRefs()
boolean	getNamespacesEnabled() Returns whether the parser processes namespaces.
boolean	getValidationEnabled() Returns true if validation is turned on.
boolean	parseSome(boolean doItAll) Entry point for parsing
boolean	parseUntilRoot(boolean doItAll)
void	readerChange(XMLEntityHandler.EntityReader nextReader, int nextReaderId) Change readers
void	reset(StringPool stringPool, XMLEntityHandler.CharBuffer literalData) reset the parser so that the instance can be reused
int	scanAttValue(QName element, QName attribute, boolean asSymbol) Scan an attribute value
void	setDTDHandler(XMLDocumentHandler.DTDHandler dtdHandler) Set the DTD handler.
void	setEventHandler(XMLDocumentScanner.EventHandler eventHandler) Set the event handler
void	setGrammarResolver(GrammarResolver resolver) Sets the grammar resolver.
void	setLoadExternalDTD(boolean enabled) Sets whether the parser loads the external DTD.
void	setMaxEntityRefs(int max)
void	setNamespacesEnabled(boolean enabled) Sets whether the parser preprocesses namespaces.
void	setValidationEnabled(boolean enabled) Sets whether the parser validates.

Methods inherited from class java.lang.Object

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

Field Detail

RESULT_SUCCESS

public static final int RESULT_SUCCESS

RESULT_FAILURE

public static final int RESULT_FAILURE

RESULT_DUPLICATE_ATTR

public static final int RESULT_DUPLICATE_ATTR

Constructor Detail

XMLDocumentScanner

public XMLDocumentScanner(StringPool stringPool,
                          XMLErrorReporter errorReporter,
                          XMLEntityHandler entityHandler,
                          XMLEntityHandler.CharBuffer literalData)

Constructor

Method Detail

setEventHandler

public void setEventHandler(XMLDocumentScanner.EventHandler eventHandler)

Set the event handler

Parameters:

eventHandler - The place to send our callbacks.

setDTDHandler

public void setDTDHandler(XMLDocumentHandler.DTDHandler dtdHandler)

Set the DTD handler.

setGrammarResolver

public void setGrammarResolver(GrammarResolver resolver)

Sets the grammar resolver.

reset

public void reset(StringPool stringPool,
                  XMLEntityHandler.CharBuffer literalData)

reset the parser so that the instance can be reused

Parameters:

stringPool - the string pool instance to be used by the reset parser

parseSome

public boolean parseSome(boolean doItAll)
                  throws java.lang.Exception

Entry point for parsing

Parameters:

doItAll - if true the entire document is parsed otherwise just the next segment of the document is parsed

parseUntilRoot

public boolean parseUntilRoot(boolean doItAll)
                       throws java.lang.Exception

readerChange

public void readerChange(XMLEntityHandler.EntityReader nextReader,
                         int nextReaderId)
                  throws java.lang.Exception

Change readers

Parameters:

nextReader - the new reader that the scanner will use

nextReaderId - id of the reader to change to

Throws:

throws - java.lang.Exception

endOfInput

public void endOfInput(int entityName,
                       boolean moreToFollow)
                throws java.lang.Exception

Handle the end of input

Parameters:

entityName - the handle in the string pool of the name of the entity which has reached end of input

moreToFollow - if true, there is still input left to process in other readers

Throws:

java.lang.Exception -

atEndOfInput

public boolean atEndOfInput()

Tell if scanner has reached end of input

Returns:

true if scanner has reached end of input.

scanAttValue

public int scanAttValue(QName element,
                        QName attribute,
                        boolean asSymbol)
                 throws java.lang.Exception

Scan an attribute value

Parameters:

elementType - handle to the element whose attribute value is being scanned

attrName - handle in the string pool of the name of attribute being scanned

asSymbol - controls whether the value is a string (duplicates allowed) or a symbol (duplicates not allowed)

Returns:

handle in the string pool of the scanned value

Throws:

java.lang.Exception -

checkXMLLangAttributeValue

public void checkXMLLangAttributeValue(int langValue)
                                throws java.lang.Exception

Check the value of an XML Language attribute

Parameters:

langValue - the handle in the string pool of the value to be checked

Throws:

java.lang.Exception -

getCurrentElementType

public int getCurrentElementType()

setNamespacesEnabled

public void setNamespacesEnabled(boolean enabled)

Sets whether the parser preprocesses namespaces.

getNamespacesEnabled

public boolean getNamespacesEnabled()

Returns whether the parser processes namespaces.

setValidationEnabled

public void setValidationEnabled(boolean enabled)

Sets whether the parser validates.

getValidationEnabled

public boolean getValidationEnabled()

Returns true if validation is turned on.

setMaxEntityRefs

public void setMaxEntityRefs(int max)

getMaxEntityRefs

public int getMaxEntityRefs()

setLoadExternalDTD

public void setLoadExternalDTD(boolean enabled)

Sets whether the parser loads the external DTD.

getLoadExternalDTD

public boolean getLoadExternalDTD()

Returns true if loading the external DTD is turned on.