net.sf.joost.stx
Class TransformerHandlerResolverImpl

java.lang.Object
  net.sf.joost.stx.TransformerHandlerResolverImpl

All Implemented Interfaces:

TransformerHandlerResolver

public final class TransformerHandlerResolverImpl

extends Object

implements TransformerHandlerResolver

The default implementation of an TransformerHandlerResolver. It supports currently only XSLT transformers.

Version:

$Revision: 2.7 $ $Date: 2004/09/29 06:09:36 $

Author:

Oliver Becker

Field Summary

TransformerHandlerResolver	customResolver A custom resolver object registered via Processor.setTransformerHandlerResolver(net.sf.joost.TransformerHandlerResolver)
static String	HTTP_POST_METHOD The URI identifying the HTTP POST method
private static String[]	knownMethods
private static int	M_POST
private static int	M_SAX
private static int	M_STX
private static int	M_XSLT
static String	SAX_METHOD The URI identifying a SAX parser
static String	XSLT_METHOD The URI identifying an XSLT transformation (the XSLT namespace)

Constructor Summary

TransformerHandlerResolverImpl()

Method Summary

boolean	available(String method) Determines whether a requested filter is available or not, used by the STX function filter-available.
private Hashtable	createExternalParameters(Hashtable params) Creates a new Hashtable with String values only
TransformerHandler	resolve(String method, String href, String base, Hashtable params) Resolves a TransformerHandler object for an external transformation.
private TransformerHandler	resolve(String method, String href, String base, XMLReader reader, Hashtable params)
TransformerHandler	resolve(String method, XMLReader reader, Hashtable params) Resolves a TransformerHandler object for an external transformation.

Methods inherited from class java.lang.Object

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

Field Detail

XSLT_METHOD

public static final String XSLT_METHOD

The URI identifying an XSLT transformation (the XSLT namespace)

See Also:

Constant Field Values

SAX_METHOD

public static final String SAX_METHOD

The URI identifying a SAX parser

See Also:

Constant Field Values

HTTP_POST_METHOD

public static final String HTTP_POST_METHOD

The URI identifying the HTTP POST method

See Also:

Constant Field Values

knownMethods

private static String[] knownMethods

M_STX

private static int M_STX

M_XSLT

private static int M_XSLT

M_SAX

private static int M_SAX

M_POST

private static int M_POST

customResolver

public TransformerHandlerResolver customResolver

A custom resolver object registered via Processor.setTransformerHandlerResolver(net.sf.joost.TransformerHandlerResolver)

Constructor Detail

TransformerHandlerResolverImpl

public TransformerHandlerResolverImpl()

Method Detail

createExternalParameters

private Hashtable createExternalParameters(Hashtable params)

Creates a new Hashtable with String values only

resolve

public TransformerHandler resolve(String method,
                                  String href,
                                  String base,
                                  Hashtable params)
                           throws SAXException

Description copied from interface: TransformerHandlerResolver

Resolves a TransformerHandler object for an external transformation. This method will be called if the filter-src attribute contains an URL, or if this attribute is missing at all.

Specified by:

resolve in interface TransformerHandlerResolver

Parameters:

method - an URI string provided in the filter-method attribute, identifying the type of the requested filter

href - the location of the source for the filter provided in the filter-src attribute (as pseudo-argument of the url(...) notation); null if the filter-src attribute is missing

base - the base URI of the transformation sheet

params - the set of parameters specified using stx:with-param elements, all values are Strings

Returns:

a TransformerHandler object that transforms a SAX stream, or null if the STX processor should try to resolve the handler itself

Throws:

SAXException - if an error occurs during the creation or initialization

resolve

public TransformerHandler resolve(String method,
                                  XMLReader reader,
                                  Hashtable params)
                           throws SAXException

Description copied from interface: TransformerHandlerResolver

Resolves a TransformerHandler object for an external transformation. This method will be called if the filter-src attribute contains a buffer specification.

Specified by:

resolve in interface TransformerHandlerResolver

Parameters:

method - an URI string provided in the filter-method attribute, identifying the type of the requested filter

reader - an XMLReader object that provides the source for the transformation as a stream of SAX events (the contents of an stx:buffer). Either parse method may be used, the required parameters systemId or input respectively will be ignored by this reader.

params - the set of parameters specified using stx:with-param elements, all values are Strings

Returns:

a TransformerHandler object that transforms a SAX stream, or null if the STX processor should try to resolve the handler itself

Throws:

SAXException - if an error occurs during the creation or initialization

resolve

private TransformerHandler resolve(String method,
                                   String href,
                                   String base,
                                   XMLReader reader,
                                   Hashtable params)
                            throws SAXException

Throws:

SAXException

available

public boolean available(String method)

Description copied from interface: TransformerHandlerResolver

Determines whether a requested filter is available or not, used by the STX function filter-available.

Specified by:

available in interface TransformerHandlerResolver

Parameters:

method - an URI string identifying the type of the requested filter

Returns:

true if this resolver will return a TransformerHandler object for this filter