public class ExtensionHandlerJavaClass extends ExtensionHandlerJava
xalan://fully.qualified.class.nameHowever, we do not enforce this. If the class name contains a a /, we only use the part to the right of the rightmost slash. In addition, we ignore any "class:" prefix. Provides functions to test a function's existence and call a function. Also provides functions to test an element's existence and call an element.
| Constructor and Description |
|---|
ExtensionHandlerJavaClass(java.lang.String namespaceUri,
java.lang.String scriptLang,
java.lang.String className)
Construct a new extension namespace handler given all the information
needed.
|
| Modifier and Type | Method and Description |
|---|---|
java.lang.Object |
callFunction(FuncExtFunction extFunction,
java.util.Vector args,
ExpressionContext exprContext)
Process a call to an XPath extension function
|
java.lang.Object |
callFunction(java.lang.String funcName,
java.util.Vector args,
java.lang.Object methodKey,
ExpressionContext exprContext)
Process a call to a function in the java class represented by
this
ExtensionHandlerJavaClass |
boolean |
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.
|
getFromCache, putToCachepublic ExtensionHandlerJavaClass(java.lang.String namespaceUri,
java.lang.String scriptLang,
java.lang.String className)
namespaceUri - the extension namespace URI that I'm implementingscriptLang - language of code implementing the extensionclassName - the fully qualified class name of the classpublic boolean isFunctionAvailable(java.lang.String function)
isFunctionAvailable in class ExtensionHandlerfunction - name of the function being testedpublic boolean isElementAvailable(java.lang.String element)
isElementAvailable in class ExtensionHandlerelement - name of the element being testedpublic java.lang.Object callFunction(java.lang.String funcName,
java.util.Vector args,
java.lang.Object methodKey,
ExpressionContext exprContext)
throws TransformerException
ExtensionHandlerJavaClass.
There are three possible types of calls:
Constructor:
classns:new(arg1, arg2, ...)
Static method:
classns:method(arg1, arg2, ...)
Instance method:
classns:method(obj, arg1, arg2, ...)
We use the following rules to determine the type of call made:
- If the function name is "new", call the best constructor for
class represented by the namespace URI
- If the first argument to the function is of the class specified
in the namespace or is a subclass of that class, look for the best
method of the class specified in the namespace with the specified
arguments. Compare all static and instance methods with the correct
method name. For static methods, use all arguments in the compare.
For instance methods, use all arguments after the first.
- Otherwise, select the best static or instance method matching
all of the arguments. If the best method is an instance method,
call the function using a default object, creating it if needed.
callFunction in class ExtensionHandlerfuncName - 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.TransformerExceptionpublic java.lang.Object callFunction(FuncExtFunction extFunction, java.util.Vector args, ExpressionContext exprContext) throws TransformerException
callFunction in class ExtensionHandlerextFunction - The XPath extension functionargs - The arguments of the function call.exprContext - The context in which this expression is being executed.TransformerExceptionpublic void processElement(java.lang.String localPart,
ElemTemplateElement element,
TransformerImpl transformer,
Stylesheet stylesheetTree,
java.lang.Object methodKey)
throws TransformerException,
java.io.IOException
processElement in class ExtensionHandlerlocalPart - 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 element call.java.io.IOException - if loading troubleTransformerException - if parsing troubleCopyright © 2014 Apache XML Project. All Rights Reserved.