org.apache.xalan.extensions
Class ExtensionHandler
java.lang.Object
|
+--org.apache.xalan.extensions.ExtensionHandler
- Direct Known Subclasses:
- ExtensionHandlerGeneral, ExtensionHandlerJava
- public abstract class ExtensionHandler
- extends java.lang.Object
**For internal use only**
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.
|
Method Summary |
abstract java.lang.Object |
callFunction(java.lang.String funcName,
java.util.Vector args,
java.lang.Object methodKey,
ExpressionContext exprContext)
Process a call to a function. |
abstract boolean |
isElementAvailable(java.lang.String element)
Tests whether a certain element name is known within this namespace. |
abstract boolean |
isFunctionAvailable(java.lang.String function)
Tests whether a certain function name is known within this namespace. |
abstract void |
processElement(java.lang.String localPart,
Element element,
TransformerImpl transformer,
Stylesheet stylesheetTree,
Node sourceTree,
Node sourceNode,
QName mode,
java.lang.Object methodKey)
Process a call to this extension namespace via an element. |
| Methods inherited from class java.lang.Object |
equals,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
isFunctionAvailable
public abstract boolean isFunctionAvailable(java.lang.String function)
- 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.
isElementAvailable
public abstract boolean isElementAvailable(java.lang.String element)
- Tests whether a certain element name is known within this namespace.
- Parameters:
function - name of the function being testedelement - Name of element to check- Returns:
- true if its known, false if not.
callFunction
public abstract java.lang.Object callFunction(java.lang.String funcName,
java.util.Vector args,
java.lang.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
processElement
public abstract void processElement(java.lang.String localPart,
Element element,
TransformerImpl transformer,
Stylesheet stylesheetTree,
Node sourceTree,
Node sourceNode,
QName mode,
java.lang.Object methodKey)
throws 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.
- Parameters:
localPart - Element name's local part.element - The extension element being processed.transformer - Handle to TransformerImpl.stylesheetTree - The compiled stylesheet tree.mode - The current mode.sourceTree - The root of the source tree (but don't assume
it's a Document).sourceNode - The current context node.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 trouble
- FileNotFoundException - if loading trouble
- java.io.IOException - if loading trouble
- TransformerException - if parsing trouble
Copyright © 2000 Apache XML Project. All Rights Reserved.