weblogic.apache.xalan.extensions
Class ExtensionsTable

java.lang.Object
  |
  +--weblogic.apache.xalan.extensions.ExtensionsTable

public class ExtensionsTable

extends java.lang.Object

Class holding a table registered extension namespace handlers

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.

Field Summary

java.util.Hashtable

m_extensionFunctionNamespaces Table of extensions that may be called from the expression language via the call(name, ...) function.

Constructor Summary

ExtensionsTable()
Primes the new ExtensionsTable object with built-in namespaces.

Method Summary

void	addExtensionNamespace(java.lang.String uri, ExtensionHandler extNS) Register an extension namespace handler.
boolean	elementAvailable(java.lang.String ns, java.lang.String elemName) Execute the element-available() function.
java.lang.Object	extFunction(java.lang.String ns, java.lang.String funcName, java.util.Vector argVec, java.lang.Object methodKey, ExpressionContext exprContext) Handle an extension function.
boolean	functionAvailable(java.lang.String ns, java.lang.String funcName) Execute the function-available() function.
ExtensionHandler	get(java.lang.String extns) Get an ExtensionHandler object that represents the given namespace.
ExtensionHandler	makeJavaNamespace(java.lang.String ns) Declare the appropriate java extension handler.

Methods inherited from class java.lang.Object

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

Field Detail

m_extensionFunctionNamespaces

public java.util.Hashtable m_extensionFunctionNamespaces

Table of extensions that may be called from the expression language via the call(name, ...) function. Objects are keyed on the call name.

Constructor Detail

ExtensionsTable

public ExtensionsTable()

Primes the new ExtensionsTable object with built-in namespaces.

Method Detail

get

public ExtensionHandler get(java.lang.String extns)

Get an ExtensionHandler object that represents the given namespace.

Parameters:

extns - A valid extension namespace.

Returns:

ExtensionHandler object that represents the given namespace.

addExtensionNamespace

public void addExtensionNamespace(java.lang.String uri,
                                  ExtensionHandler extNS)

Register an extension namespace handler. This handler provides functions for testing whether a function is known within the namespace and also for invoking the functions.

Parameters:

uri - the URI for the extension.

extNS - the extension handler.

functionAvailable

public boolean functionAvailable(java.lang.String ns,
                                 java.lang.String funcName)
                          throws javax.xml.transform.TransformerException

Execute the function-available() function.

Parameters:

ns - the URI of namespace in which the function is needed

funcName - the function name being tested

Returns:

whether the given function is available or not.

Throws:

javax.xml.transform.TransformerException -

elementAvailable

public boolean elementAvailable(java.lang.String ns,
                                java.lang.String elemName)
                         throws javax.xml.transform.TransformerException

Execute the element-available() function.

Parameters:

ns - the URI of namespace in which the function is needed

funcName - the function name being tested

elemName - name of element being tested

Returns:

whether the given function is available or not.

Throws:

javax.xml.transform.TransformerException -

extFunction

public java.lang.Object extFunction(java.lang.String ns,
                                    java.lang.String funcName,
                                    java.util.Vector argVec,
                                    java.lang.Object methodKey,
                                    ExpressionContext exprContext)
                             throws javax.xml.transform.TransformerException

Handle an extension function.

Parameters:

ns - the URI of namespace in which the function is needed

funcName - the function name being called

argVec - arguments to the function in a vector

methodKey - a unique key identifying this function instance in the stylesheet

exprContext - a context which may be passed to an extension function and provides callback functions to access various areas in the environment

Returns:

result of executing the function

Throws:

javax.xml.transform.TransformerException -

makeJavaNamespace

public ExtensionHandler makeJavaNamespace(java.lang.String ns)
                                   throws javax.xml.transform.TransformerException

Declare the appropriate java extension handler.

Parameters:

ns - the URI of namespace in which the function is needed

Returns:

an ExtensionHandler for this namespace, or null if not found.

Throws:

javax.xml.transform.TransformerException -