Package org.apache.xalan.extensions
Class ExtensionHandler
java.lang.Object
org.apache.xalan.extensions.ExtensionHandler
- Direct Known Subclasses:
ExtensionHandlerExsltFunction
,ExtensionHandlerGeneral
,ExtensionHandlerJava
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.
- Author:
- Sanjiva Weerawarana (sanjiva@watson.ibm.com)
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Method Summary
Modifier and TypeMethodDescriptionabstract Object
callFunction
(String funcName, Vector args, Object methodKey, ExpressionContext exprContext) Process a call to a function.abstract Object
callFunction
(FuncExtFunction extFunction, Vector args, ExpressionContext exprContext) Process a call to a function.abstract boolean
isElementAvailable
(String element) Tests whether a certain element name is known within this namespace.abstract boolean
isFunctionAvailable
(String function) Tests whether a certain function name is known within this namespace.abstract void
processElement
(String localPart, ElemTemplateElement element, TransformerImpl transformer, Stylesheet stylesheetTree, Object methodKey) Process a call to this extension namespace via an element.
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Method Details
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isFunctionAvailable
Tests whether a certain function name is known within this namespace.- Parameters:
function
- name of the function being tested- Returns:
- true if its known, false if not.
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isElementAvailable
Tests whether a certain element name is known within this namespace.- Parameters:
element
- Name of element to check- Returns:
- true if its known, false if not.
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callFunction
public abstract Object callFunction(String funcName, Vector args, Object methodKey, ExpressionContext exprContext) throws TransformerException Process a call to a function.- Parameters:
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.- Returns:
- the return value of the function evaluation.
- Throws:
TransformerException
- if parsing trouble
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callFunction
public abstract Object callFunction(FuncExtFunction extFunction, Vector args, ExpressionContext exprContext) throws TransformerException Process a call to a function.- Parameters:
extFunction
- The XPath extension function.args
- The arguments of the function call.exprContext
- The context in which this expression is being executed.- Returns:
- the return value of the function evaluation.
- Throws:
TransformerException
- if parsing trouble
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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.- 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:
XSLProcessorException
- thrown if something goes wrong while running the extension handler.MalformedURLException
- if loading troubleFileNotFoundException
- if loading troubleIOException
- if loading troubleTransformerException
- if parsing trouble
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