org.apache.fop.tools
Class DocumentReader

java.lang.Object
  |
  +--org.apache.fop.tools.DocumentReader

public class DocumentReader

extends java.lang.Object

implements org.xml.sax.XMLReader

This presents a DOM as an XMLReader to make it easy to use a Document with a SAX-based implementation.

Author:

Kelly A Campbell

Constructor Summary

DocumentReader()

Method Summary

org.xml.sax.ContentHandler	getContentHandler() Return the current content handler.
org.xml.sax.DTDHandler	getDTDHandler() Return the current DTD handler.
org.xml.sax.EntityResolver	getEntityResolver() Return the current entity resolver.
org.xml.sax.ErrorHandler	getErrorHandler() Return the current error handler.
boolean	getFeature(java.lang.String name) Look up the value of a feature.
java.lang.Object	getProperty(java.lang.String name) Look up the value of a property.
void	parse(org.xml.sax.InputSource input) Parse an XML DOM document.
void	parse(java.lang.String systemId) DocumentReader requires a DocumentInputSource, so this is not implements and simply throws a SAXException.
void	setContentHandler(org.xml.sax.ContentHandler handler) Allow an application to register a content event handler.
void	setDTDHandler(org.xml.sax.DTDHandler handler) Allow an application to register a DTD event handler.
void	setEntityResolver(org.xml.sax.EntityResolver resolver) Allow an application to register an entity resolver.
void	setErrorHandler(org.xml.sax.ErrorHandler handler) Allow an application to register an error event handler.
void	setFeature(java.lang.String name, boolean value) Set the state of a feature.
void	setProperty(java.lang.String name, java.lang.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

Constructor Detail

DocumentReader

public DocumentReader()

Method Detail

getFeature

public boolean getFeature(java.lang.String name)
                   throws org.xml.sax.SAXNotRecognizedException,
                          org.xml.sax.SAXNotSupportedException

Look up the value of a feature.

The feature name is any fully-qualified URI. It is possible for an XMLReader to recognize a feature name but to be unable to return its value; this is especially true in the case of an adapter for a SAX1 Parser, which has no way of knowing whether the underlying parser is performing validation or expanding external entities.

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

Some feature values may be available only in specific contexts, such as before, during, or after a parse.

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 org.xml.sax.XMLReader

Parameters:

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

Returns:

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

Throws:

org.xml.sax.SAXNotRecognizedException - When the XMLReader does not recognize the feature name.

org.xml.sax.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(java.lang.String name,
                       boolean value)
                throws org.xml.sax.SAXNotRecognizedException,
                       org.xml.sax.SAXNotSupportedException

Set the state of a feature.

The feature name is any fully-qualified URI. It is possible for an XMLReader to recognize a feature name but to be unable to set its value; this is especially true in the case of an adapter for a SAX1 Parser, which has no way of affecting whether the underlying parser is validating, for example.

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.

Some feature values may be immutable or mutable only in specific contexts, such as before, during, or after a parse.

Specified by:

setFeature in interface org.xml.sax.XMLReader

Parameters:

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

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

Throws:

org.xml.sax.SAXNotRecognizedException - When the XMLReader does not recognize the feature name.

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

See Also:

getFeature(java.lang.String)

getProperty

public java.lang.Object getProperty(java.lang.String name)
                             throws org.xml.sax.SAXNotRecognizedException,
                                    org.xml.sax.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 to be unable to return its state; this is especially true in the case of an adapter for a SAX1 Parser.

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

Some property values may be available only in specific contexts, such as before, during, or after a parse.

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

Specified by:

getProperty in interface org.xml.sax.XMLReader

Parameters:

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

Returns:

The current value of the property.

Throws:

org.xml.sax.SAXNotRecognizedException - When the XMLReader does not recognize the property name.

org.xml.sax.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(java.lang.String name,
                        java.lang.Object value)
                 throws org.xml.sax.SAXNotRecognizedException,
                        org.xml.sax.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 set its value; this is especially true in the case of an adapter for a SAX1 Parser.

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

Some property values may be immutable or mutable only in specific contexts, such as before, during, or after a parse.

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

Specified by:

setProperty in interface org.xml.sax.XMLReader

Parameters:

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

state - The requested value for the property.

Throws:

org.xml.sax.SAXNotRecognizedException - When the XMLReader does not recognize the property name.

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

setEntityResolver

public void setEntityResolver(org.xml.sax.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 org.xml.sax.XMLReader

Parameters:

resolver - The entity resolver.

Throws:

java.lang.NullPointerException - If the resolver argument is null.

See Also:

getEntityResolver()

getEntityResolver

public org.xml.sax.EntityResolver getEntityResolver()

Return the current entity resolver.

Specified by:

getEntityResolver in interface org.xml.sax.XMLReader

Returns:

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

See Also:

setEntityResolver(org.xml.sax.EntityResolver)

setDTDHandler

public void setDTDHandler(org.xml.sax.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 org.xml.sax.XMLReader

Parameters:

handler - The DTD handler.

Throws:

java.lang.NullPointerException - If the handler argument is null.

See Also:

getDTDHandler()

getDTDHandler

public org.xml.sax.DTDHandler getDTDHandler()

Return the current DTD handler.

Specified by:

getDTDHandler in interface org.xml.sax.XMLReader

Returns:

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

See Also:

setDTDHandler(org.xml.sax.DTDHandler)

setContentHandler

public void setContentHandler(org.xml.sax.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 org.xml.sax.XMLReader

Parameters:

handler - The content handler.

Throws:

java.lang.NullPointerException - If the handler argument is null.

See Also:

getContentHandler()

getContentHandler

public org.xml.sax.ContentHandler getContentHandler()

Return the current content handler.

Specified by:

getContentHandler in interface org.xml.sax.XMLReader

Returns:

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

See Also:

setContentHandler(org.xml.sax.ContentHandler)

setErrorHandler

public void setErrorHandler(org.xml.sax.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 org.xml.sax.XMLReader

Parameters:

handler - The error handler.

Throws:

java.lang.NullPointerException - If the handler argument is null.

See Also:

getErrorHandler()

getErrorHandler

public org.xml.sax.ErrorHandler getErrorHandler()

Return the current error handler.

Specified by:

getErrorHandler in interface org.xml.sax.XMLReader

Returns:

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

See Also:

setErrorHandler(org.xml.sax.ErrorHandler)

parse

public void parse(org.xml.sax.InputSource input)
           throws java.io.IOException,
                  org.xml.sax.SAXException

Parse an XML DOM document.

Specified by:

parse in interface org.xml.sax.XMLReader

Parameters:

source - The input source for the top-level of the XML document.

Throws:

org.xml.sax.SAXException - Any SAX exception, possibly wrapping another exception.

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

See Also:

InputSource, parse(java.lang.String), setEntityResolver(org.xml.sax.EntityResolver), setDTDHandler(org.xml.sax.DTDHandler), setContentHandler(org.xml.sax.ContentHandler), setErrorHandler(org.xml.sax.ErrorHandler)

parse

public void parse(java.lang.String systemId)
           throws java.io.IOException,
                  org.xml.sax.SAXException

DocumentReader requires a DocumentInputSource, so this is not implements and simply throws a SAXException. Use parse(DocumentInputSource) instead

Specified by:

parse in interface org.xml.sax.XMLReader

Parameters:

systemId - The system identifier (URI).

Throws:

org.xml.sax.SAXException - Any SAX exception, possibly wrapping another exception.

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

See Also:

parse(org.xml.sax.InputSource)