org.apache.xalan.extensions
Class ExtensionsTable

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

public class ExtensionsTable

extends java.lang.Object

**For internal use only** Class holding a table registered extension namespace handlers

Field Summary

java.util.Hashtable

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

Constructor Summary

ExtensionsTable()
**For internal use only** Primes the new ExtensionsTable object with built-in namespaces.

Method Summary

void	addExtensionNamespace(java.lang.String uri, ExtensionHandler extNS) **For advanced use only** 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

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

Field Detail

m_extensionFunctionNamespaces

public java.util.Hashtable m_extensionFunctionNamespaces

**For internal use only** 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()

**For internal use only** 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)

**For advanced use only** 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 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:

TransformerException -

elementAvailable

public boolean elementAvailable(java.lang.String ns,
                                java.lang.String elemName)
                         throws 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:

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 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:

TransformerException -

makeJavaNamespace

public ExtensionHandler makeJavaNamespace(java.lang.String ns)
                                   throws 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:

TransformerException -