Package org.apache.xalan.extensions
Class ExtensionHandlerGeneral
- java.lang.Object
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- org.apache.xalan.extensions.ExtensionHandler
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- org.apache.xalan.extensions.ExtensionHandlerGeneral
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public class ExtensionHandlerGeneral extends ExtensionHandler
Class handling an extension namespace for XPath. Provides functions to test a function's existence and call a function- Author:
- Sanjiva Weerawarana (sanjiva@watson.ibm.com)
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Constructor Summary
Constructors Constructor Description ExtensionHandlerGeneral(java.lang.String namespaceUri, StringVector elemNames, StringVector funcNames, java.lang.String scriptLang, java.lang.String scriptSrcURL, java.lang.String scriptSrc, java.lang.String systemId)
Construct a new extension namespace handler given all the information needed.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
callFunction(java.lang.String funcName, java.util.Vector args, java.lang.Object methodKey, ExpressionContext exprContext)
Process a call to a function.java.lang.Object
callFunction(FuncExtFunction extFunction, java.util.Vector args, ExpressionContext exprContext)
Process a call to an XPath extension functionboolean
isElementAvailable(java.lang.String element)
Tests whether a certain element name is known within this namespace.boolean
isFunctionAvailable(java.lang.String function)
Tests whether a certain function name is known within this namespace.void
processElement(java.lang.String localPart, ElemTemplateElement element, TransformerImpl transformer, Stylesheet stylesheetTree, java.lang.Object methodKey)
Process a call to this extension namespace via an element.
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Constructor Detail
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ExtensionHandlerGeneral
public ExtensionHandlerGeneral(java.lang.String namespaceUri, StringVector elemNames, StringVector funcNames, java.lang.String scriptLang, java.lang.String scriptSrcURL, java.lang.String scriptSrc, java.lang.String systemId) throws javax.xml.transform.TransformerException
Construct a new extension namespace handler given all the information needed.- Parameters:
namespaceUri
- the extension namespace URI that I'm implementingelemNames
- Vector of element namesfuncNames
- string containing list of functions of extension NSscriptLang
- Scripting language of implementationscriptSrcURL
- URL of source scriptscriptSrc
- the actual script code (if any)systemId
-- Throws:
javax.xml.transform.TransformerException
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Method Detail
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isFunctionAvailable
public boolean isFunctionAvailable(java.lang.String function)
Tests whether a certain function name is known within this namespace.- Specified by:
isFunctionAvailable
in classExtensionHandler
- Parameters:
function
- name of the function being tested- Returns:
- true if its known, false if not.
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isElementAvailable
public boolean isElementAvailable(java.lang.String element)
Tests whether a certain element name is known within this namespace.- Specified by:
isElementAvailable
in classExtensionHandler
- Parameters:
element
- name of the element being tested- Returns:
- true if its known, false if not.
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callFunction
public java.lang.Object callFunction(java.lang.String funcName, java.util.Vector args, java.lang.Object methodKey, ExpressionContext exprContext) throws javax.xml.transform.TransformerException
Process a call to a function.- Specified by:
callFunction
in classExtensionHandler
- 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:
javax.xml.transform.TransformerException
- if parsing trouble
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callFunction
public java.lang.Object callFunction(FuncExtFunction extFunction, java.util.Vector args, ExpressionContext exprContext) throws javax.xml.transform.TransformerException
Process a call to an XPath extension function- Specified by:
callFunction
in classExtensionHandler
- Parameters:
extFunction
- The XPath extension functionargs
- 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:
javax.xml.transform.TransformerException
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processElement
public void processElement(java.lang.String localPart, ElemTemplateElement element, TransformerImpl transformer, Stylesheet stylesheetTree, java.lang.Object methodKey) throws javax.xml.transform.TransformerException, java.io.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.- Specified by:
processElement
in classExtensionHandler
- 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 troublejava.io.IOException
- if loading troublejavax.xml.transform.TransformerException
- if parsing trouble
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