com.webmethods.rtl.markup.xml.parser

Class BaseParser

java.lang.Object

com.webmethods.rtl.markup.xml.parser.BaseParser

All Implemented Interfaces:

XMLReader

Direct Known Subclasses:

BaseFilter, HTMLParser

public abstract class BaseParser
extends Object
implements XMLReader

Base SAX Parser. Only one thread at a time may use this parser.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	ACCEPT_CHARSET
protected static String	CONTENT_CHARSET
protected static String	DEFAULT_CHARSET
protected ContentHandler	m_contentHandler
protected DTDHandler	m_dtdHandler
protected EntityResolver	m_entityResolver
protected ErrorHandler	m_errorHandler
protected Map	m_features
protected LexicalHandler	m_lexicalHandler
protected Map	m_properties
protected Map	m_recognizedFeatures
protected Map	m_recognizedProperties
static String	PROPERTY_LEXICAL_HANDLER

Constructor Summary

Constructors

Constructor and Description
BaseParser()

Method Summary

Modifier and Type	Method and Description
protected Reader	getCharacterStream(InputSource input)
ContentHandler	getContentHandler() Return the current content handler.
DTDHandler	getDTDHandler() Return the current DTD handler.
EntityResolver	getEntityResolver() Return the current entity resolver.
ErrorHandler	getErrorHandler() Return the current error handler.
boolean	getFeature(String name) Look up the value of a feature flag.
Object	getProperty(String name) Look up the value of a property.
void	parse(String systemId) Parse an XML document from a system identifier (URI).
void	setContentHandler(ContentHandler handler) Allow an application to register a content event handler.
void	setDTDHandler(DTDHandler handler) Allow an application to register a DTD event handler.
void	setEntityResolver(EntityResolver resolver) Allow an application to register an entity resolver.
void	setErrorHandler(ErrorHandler handler) Allow an application to register an error event handler.
void	setFeature(String name, boolean value) Set the value of a feature flag.
void	setProperty(String name, Object value) Set the value of a property.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.xml.sax.XMLReader

parse

Field Detail

PROPERTY_LEXICAL_HANDLER

public static final String PROPERTY_LEXICAL_HANDLER

See Also:

Constant Field Values

ACCEPT_CHARSET

protected static final String ACCEPT_CHARSET

See Also:

Constant Field Values

CONTENT_CHARSET

protected static final String CONTENT_CHARSET

See Also:

Constant Field Values

DEFAULT_CHARSET

protected static final String DEFAULT_CHARSET

See Also:

Constant Field Values

m_entityResolver

protected EntityResolver m_entityResolver

m_dtdHandler

protected DTDHandler m_dtdHandler

m_contentHandler

protected ContentHandler m_contentHandler

m_errorHandler

protected ErrorHandler m_errorHandler

m_lexicalHandler

protected LexicalHandler m_lexicalHandler

m_features

protected Map m_features

m_recognizedFeatures

protected Map m_recognizedFeatures

m_properties

protected Map m_properties

m_recognizedProperties

protected Map m_recognizedProperties

Constructor Detail

BaseParser

public BaseParser()

Method Detail

getFeature

public boolean getFeature(String name)
                   throws SAXNotRecognizedException,
                          SAXNotSupportedException

Look up the value of a feature flag.

The feature name is any fully-qualified URI. It is possible for an XMLReader to recognize a feature name but temporarily be unable to return its value. Some feature values may be available only in specific contexts, such as before, during, or after a parse. Also, some feature values may not be programmatically accessible. (In the case of an adapter for SAX1 Parser, there is no implementation-independent way to expose whether the underlying parser is performing validation, expanding external entities, and so forth.)

All XMLReaders are required to recognize the http://xml.org/sax/features/namespaces and the http://xml.org/sax/features/namespace-prefixes feature names.

Typical usage is something like this:

 XMLReader r = new MySAXDriver();

                         // try to activate validation
 try {
   r.setFeature("http://xml.org/sax/features/validation", true);
 } catch (SAXException e) {
   System.err.println("Cannot activate validation.");
 }

                         // register event handlers
 r.setContentHandler(new MyContentHandler());
 r.setErrorHandler(new MyErrorHandler());

                         // parse the first document
 try {
   r.parse("http://www.foo.com/mydoc.xml");
 } catch (IOException e) {
   System.err.println("I/O exception reading XML document");
 } catch (SAXException e) {
   System.err.println("XML exception reading document.");
 }
 

Implementors are free (and encouraged) to invent their own features, using names built on their own URIs.

Specified by:

getFeature in interface XMLReader

Parameters:

name - The feature name, which is a fully-qualified URI.

Returns:

The current value of the feature (true or false).

Throws:

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

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

See Also:

setFeature(java.lang.String, boolean)

setFeature

public void setFeature(String name,
                       boolean value)
                throws SAXNotRecognizedException,
                       SAXNotSupportedException

Set the value of a feature flag.

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

All XMLReaders are required to support setting http://xml.org/sax/features/namespaces to true and http://xml.org/sax/features/namespace-prefixes to false.

Specified by:

setFeature in interface XMLReader

Parameters:

name - The feature name, which is a fully-qualified URI.

value - The requested value of the feature (true or false).

Throws:

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

SAXNotSupportedException - When the XMLReader recognizes the feature name but cannot set the requested value.

See Also:

getFeature(java.lang.String)

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 an XMLReader 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 parse.

XMLReaders are not required to recognize any specific property names, though an initial core set is documented for SAX2.

Implementors are free (and encouraged) to invent their own properties, using names built on their own URIs.

Specified by:

getProperty in interface XMLReader

Parameters:

name - The property name, which is a 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.

See Also:

setProperty(java.lang.String, java.lang.Object)

setProperty

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

Set the value of a property.

The property name is any fully-qualified URI. It is possible for an XMLReader 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 parse.

XMLReaders are not required to recognize setting any specific property names, though a core set is defined by SAX2.

This method is also the standard mechanism for setting extended handlers.

Specified by:

setProperty in interface XMLReader

Parameters:

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

value - The requested value for the property.

Throws:

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

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

setEntityResolver

public void setEntityResolver(EntityResolver resolver)

Allow an application to register an entity resolver.

If the application does not register an entity resolver, the XMLReader will perform its own default resolution.

Applications may register a new or different resolver in the middle of a parse, and the SAX parser must begin using the new resolver immediately.

Specified by:

setEntityResolver in interface XMLReader

Parameters:

resolver - The entity resolver.

See Also:

getEntityResolver()

getEntityResolver

public EntityResolver getEntityResolver()

Return the current entity resolver.

Specified by:

getEntityResolver in interface XMLReader

Returns:

The current entity resolver, or null if none has been registered.

See Also:

setEntityResolver(org.xml.sax.EntityResolver)

setDTDHandler

public void setDTDHandler(DTDHandler handler)

Allow an application to register a DTD event handler.

If the application does not register a DTD handler, all DTD events reported by the SAX parser will be silently ignored.

Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

Specified by:

setDTDHandler in interface XMLReader

Parameters:

handler - The DTD handler.

See Also:

getDTDHandler()

getDTDHandler

public DTDHandler getDTDHandler()

Return the current DTD handler.

Specified by:

getDTDHandler in interface XMLReader

Returns:

The current DTD handler, or null if none has been registered.

See Also:

setDTDHandler(org.xml.sax.DTDHandler)

setContentHandler

public void setContentHandler(ContentHandler handler)

Allow an application to register a content event handler.

If the application does not register a content handler, all content events reported by the SAX parser will be silently ignored.

Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

Specified by:

setContentHandler in interface XMLReader

Parameters:

handler - The content handler.

See Also:

getContentHandler()

getContentHandler

public ContentHandler getContentHandler()

Return the current content handler.

Specified by:

getContentHandler in interface XMLReader

Returns:

The current content handler, or null if none has been registered.

See Also:

setContentHandler(org.xml.sax.ContentHandler)

setErrorHandler

public void setErrorHandler(ErrorHandler handler)

Allow an application to register an error event handler.

If the application does not register an error handler, all error events reported by the SAX parser will be silently ignored; however, normal processing may not continue. It is highly recommended that all SAX applications implement an error handler to avoid unexpected bugs.

Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

Specified by:

setErrorHandler in interface XMLReader

Parameters:

handler - The error handler.

See Also:

getErrorHandler()

getErrorHandler

public ErrorHandler getErrorHandler()

Return the current error handler.

Specified by:

getErrorHandler in interface XMLReader

Returns:

The current error handler, or null if none has been registered.

See Also:

setErrorHandler(org.xml.sax.ErrorHandler)

parse

public void parse(String systemId)
           throws IOException,
                  SAXException

Parse an XML document from a system identifier (URI).

This method is a shortcut for the common case of reading a document from a system identifier. It is the exact equivalent of the following:

 parse(new InputSource(systemId));
 

If the system identifier is a URL, it must be fully resolved by the application before it is passed to the parser.

Specified by:

parse in interface XMLReader

Parameters:

systemId - The system identifier (URI).

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

See Also:

XMLReader.parse(InputSource)

getCharacterStream

protected Reader getCharacterStream(InputSource input)
                             throws IOException,
                                    SAXException

Throws:

IOException

SAXException