org.apache.xalan.extensions
Class ExtensionHandlerExsltFunction

java.lang.Object
  org.apache.xalan.extensions.ExtensionHandler
      org.apache.xalan.extensions.ExtensionHandlerExsltFunction

public class ExtensionHandlerExsltFunction

extends ExtensionHandler

Execute EXSLT functions, determine the availability of EXSLT functions, and the availability of an EXSLT result element.

Field Summary

private String	m_namespace
private StylesheetRoot	m_stylesheet
private static QName	RESULTQNAME

Fields inherited from class org.apache.xalan.extensions.ExtensionHandler

m_namespaceUri, m_scriptLang

Constructor Summary

ExtensionHandlerExsltFunction(String ns, StylesheetRoot stylesheet)
Constructor called from ElemExsltFunction runtimeInit().

Method Summary

private boolean	ancestorIsFunction(ElemTemplateElement child) Determine whether the func:result element is within a func:function element.
Object	callFunction(String funcName, Vector args, Object methodKey, ExpressionContext exprContext) Execute the EXSLT function and return the result value.
ElemExsltFunction	getFunction(String funcName) Get the ElemExsltFunction element associated with the function.
boolean	isElementAvailable(String elemName) If an element-available() call applies to an EXSLT result element within an EXSLT function element, return true.
boolean	isFunctionAvailable(String funcName) Does the EXSLT function exist?
void	processElement(String localPart, ElemTemplateElement element, TransformerImpl transformer, Stylesheet stylesheetTree, Object methodKey) Required by ExtensionHandler (an abstract method).

Methods inherited from class org.apache.xalan.extensions.ExtensionHandler

getClassForName

Methods inherited from class java.lang.Object

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

Field Detail

m_namespace

private String m_namespace

m_stylesheet

private StylesheetRoot m_stylesheet

RESULTQNAME

private static final QName RESULTQNAME

Constructor Detail

ExtensionHandlerExsltFunction

public ExtensionHandlerExsltFunction(String ns,
                                     StylesheetRoot stylesheet)

Constructor called from ElemExsltFunction runtimeInit().

Method Detail

processElement

public void processElement(String localPart,
                           ElemTemplateElement element,
                           TransformerImpl transformer,
                           Stylesheet stylesheetTree,
                           Object methodKey)
                    throws javax.xml.transform.TransformerException,
                           IOException

Required by ExtensionHandler (an abstract method). No-op.

Specified by:

processElement in class ExtensionHandler

Parameters:

localPart - Element name's local part.

element - The extension element being processed.

transformer - Handle to TransformerImpl.

stylesheetTree - The compiled stylesheet tree.

methodKey - A key that uniquely identifies this class and method call.

Throws:

javax.xml.transform.TransformerException - if parsing trouble

IOException - if loading trouble

getFunction

public ElemExsltFunction getFunction(String funcName)

Get the ElemExsltFunction element associated with the function.

Parameters:

funcName - Local name of the function.

Returns:

the ElemExsltFunction element associated with the function, null if none exists.

isFunctionAvailable

public boolean isFunctionAvailable(String funcName)

Does the EXSLT function exist?

Specified by:

isFunctionAvailable in class ExtensionHandler

Parameters:

funcName - Local name of the function.

Returns:

true if the function exists.

isElementAvailable

public boolean isElementAvailable(String elemName)

If an element-available() call applies to an EXSLT result element within an EXSLT function element, return true. Note: The EXSLT function element is a template-level element, and element-available() returns false for it.

Specified by:

isElementAvailable in class ExtensionHandler

Parameters:

elemName - Name of element to check

Returns:

true if the function is available.

ancestorIsFunction

private boolean ancestorIsFunction(ElemTemplateElement child)

Determine whether the func:result element is within a func:function element. If not, it is illegal.

callFunction

public Object callFunction(String funcName,
                           Vector args,
                           Object methodKey,
                           ExpressionContext exprContext)
                    throws javax.xml.transform.TransformerException

Execute the EXSLT function and return the result value.

Specified by:

callFunction in class ExtensionHandler

Parameters:

funcName - Name of the EXSLT function.

args - The arguments of the function call.

methodKey - Not used.

exprContext - Used to get the XPathContext.

Returns:

the return value of the function evaluation.

Throws:

javax.xml.transform.TransformerException