org.apache.xalan.extensions
Class ExtensionHandler
java.lang.Objectorg.apache.xalan.extensions.ExtensionHandler
public abstract class ExtensionHandler
extends java.lang.Object
Abstract base class for handling an extension namespace for XPath.
Provides functions to test a function's existence and call a function.
Also provides functions for calling an element and testing for
an element's existence.
- Sanjiva Weerawarana (sanjiva@watson.ibm.com)
callFunction
public abstract Object callFunction(String funcName,
Vector args,
Object methodKey,
ExpressionContext exprContext)
throws TransformerException Process a call to a function.
funcName - Function name.args - The arguments of the function call.methodKey - A key that uniquely identifies this class and method call.exprContext - The context in which this expression is being executed.
- the return value of the function evaluation.
callFunction
public abstract Object callFunction(FuncExtFunction extFunction,
Vector args,
ExpressionContext exprContext)
throws TransformerException Process a call to a function.
extFunction - The XPath extension function.args - The arguments of the function call.exprContext - The context in which this expression is being executed.
- the return value of the function evaluation.
isElementAvailable
public abstract boolean isElementAvailable(String element)
Tests whether a certain element name is known within this namespace.
element - Name of element to check
- true if its known, false if not.
isFunctionAvailable
public abstract boolean isFunctionAvailable(String function)
Tests whether a certain function name is known within this namespace.
function - name of the function being tested
- true if its known, false if not.
processElement
public abstract void processElement(String localPart,
ElemTemplateElement element,
TransformerImpl transformer,
Stylesheet stylesheetTree,
Object methodKey)
throws TransformerException,
IOException Process a call to this extension namespace via an element. As a side
effect, the results are sent to the TransformerImpl's result tree.
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.
Copyright B) 2004 Apache XML Project. All Rights Reserved.