org.apache.xalan.extensions

## Class ExtensionHandlerExsltFunction

- java.lang.Object
- - org.apache.xalan.extensions.ExtensionHandler
  - - org.apache.xalan.extensions.ExtensionHandlerExsltFunction

-     public class ExtensionHandlerExsltFunction
      extends ExtensionHandler

  Execute EXSLT functions, determine the availability of EXSLT functions, and the availability of an EXSLT result element.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ExtensionHandlerExsltFunction(java.lang.String ns, StylesheetRoot stylesheet)` Constructor called from ElemExsltFunction runtimeInit().

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.Object` | `callFunction(FuncExtFunction extFunction, java.util.Vector args, ExpressionContext exprContext)` Execute the EXSLT function and return the result value.
    `java.lang.Object` | `callFunction(java.lang.String funcName, java.util.Vector args, java.lang.Object methodKey, ExpressionContext exprContext)` Execute the EXSLT function and return the result value.
    `ElemExsltFunction` | `getFunction(java.lang.String funcName)` Get the ElemExsltFunction element associated with the function.
    `boolean` | `isElementAvailable(java.lang.String elemName)` If an element-available() call applies to an EXSLT result element within an EXSLT function element, return true.
    `boolean` | `isFunctionAvailable(java.lang.String funcName)` Does the EXSLT function exist?
    `void` | `processElement(java.lang.String localPart, ElemTemplateElement element, TransformerImpl transformer, Stylesheet stylesheetTree, java.lang.Object methodKey)` Required by ExtensionHandler (an abstract method).

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ExtensionHandlerExsltFunction

          public ExtensionHandlerExsltFunction(java.lang.String ns,
                                       StylesheetRoot stylesheet)

      Constructor called from ElemExsltFunction runtimeInit().

  - ### Method Detail

    - #### processElement

          public void processElement(java.lang.String localPart,
                            ElemTemplateElement element,
                            TransformerImpl transformer,
                            Stylesheet stylesheetTree,
                            java.lang.Object methodKey)
                              throws TransformerException,
                                     java.io.IOException

      Required by ExtensionHandler (an abstract method). No-op.
      Specified by:
        `processElement` in class `ExtensionHandler`
      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:
        `TransformerException` - if parsing trouble
        `java.io.IOException` - if loading trouble

    - #### getFunction

          public ElemExsltFunction getFunction(java.lang.String funcName)

      Get the ElemExsltFunction element associated with the function.
      Parameters:
        `funcName` - Local name of the function.
      Returns:
        the ElemExsltFunction element associated with the function, null if none exists.

    - #### isFunctionAvailable

          public boolean isFunctionAvailable(java.lang.String funcName)

      Does the EXSLT function exist?
      Specified by:
        `isFunctionAvailable` in class `ExtensionHandler`
      Parameters:
        `funcName` - Local name of the function.
      Returns:
        true if the function exists.

    - #### isElementAvailable

          public boolean isElementAvailable(java.lang.String elemName)

      If an element-available() call applies to an EXSLT result element within an EXSLT function element, return true. Note: The EXSLT function element is a template-level element, and element-available() returns false for it.
      Specified by:
        `isElementAvailable` in class `ExtensionHandler`
      Parameters:
        `elemName` - name of the element.
      Returns:
        true if the function is available.

    - #### callFunction

          public java.lang.Object callFunction(java.lang.String funcName,
                                      java.util.Vector args,
                                      java.lang.Object methodKey,
                                      ExpressionContext exprContext)
                                        throws TransformerException

      Execute the EXSLT function and return the result value.
      Specified by:
        `callFunction` in class `ExtensionHandler`
      Parameters:
        `funcName` - Name of the EXSLT function.
        `args` - The arguments of the function call.
        `methodKey` - Not used.
        `exprContext` - Used to get the XPathContext.
      Returns:
        the return value of the function evaluation.
      Throws:
        `TransformerException`

    - #### callFunction

          public java.lang.Object callFunction(FuncExtFunction extFunction,
                                      java.util.Vector args,
                                      ExpressionContext exprContext)
                                        throws TransformerException

      Execute the EXSLT function and return the result value.
      Specified by:
        `callFunction` in class `ExtensionHandler`
      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`

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