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## weblogic.apache.xpath.functions
Class Function

    java.lang.Object
      |
      +--weblogic.apache.xpath.Expression
            |
            +--weblogic.apache.xpath.functions.Function

Direct Known Subclasses:
  FuncCurrent, FuncExtFunction, FuncFalse, FuncLast, FuncPosition, FunctionOneArg, FuncTrue

public abstract class Function
extends Expression

This is a superclass of all XPath functions. This allows two ways for the class to be called. One method is that the super class processes the arguments and hands the results to the derived class, the other method is that the derived class may process it's own arguments, which is faster since the arguments don't have to be added to an array, but causes a larger code footprint.

This class is based on an implementation from the Apache XML Project. In future releases the XML parser, XSLT processor, and associated classes will likely be updated to be based on a later version of the Apache implementations. Since Apache does not guarantee backwards compatibility between versions of their software, we cannot guarantee backwards compatibility of any of the classes contained in the weblogic.apache package or sub-packages.

See Also:
  Serialized Form

Fields inherited from class weblogic.apache.xpath.Expression
`m_slocator`

Constructor Summary
`Function()`

Method Summary
`void` | `checkNumberArgs(int argNum)` Check that the number of arguments passed to this function is correct.
`XObject` | `execute(XPathContext xctxt)` Execute an XPath function object.
`void` | `setArg(Expression arg, int argNum)` Set an argument expression for a function.

Methods inherited from class weblogic.apache.xpath.Expression
`asIterator, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, execute, executeCharsToContentHandler, fixupVariables, isNodesetExpr, isStableNumber, num, setSourceLocator, warn, xstr`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Function

    public Function()

Method Detail

### setArg

    public void setArg(Expression arg,
                       int argNum)
                throws WrongNumberArgsException

  Set an argument expression for a function. This method is called by the XPath compiler.

  Parameters:
    `arg` - non-null expression that represents the argument.
    `argNum` - The argument number index.
  Throws:
    WrongNumberArgsException - If the argNum parameter is beyond what is specified for this function.

### checkNumberArgs

    public void checkNumberArgs(int argNum)
                         throws WrongNumberArgsException

  Check that the number of arguments passed to this function is correct. This method is meant to be overloaded by derived classes, to check for the number of arguments for a specific function type. This method is called by the compiler for static number of arguments checking.

  Parameters:
    `argNum` - The number of arguments that is being passed to the function.
  Throws:
    WrongNumberArgsException -

### execute

    public XObject execute(XPathContext xctxt)
                    throws javax.xml.transform.TransformerException

  Execute an XPath function object. The function must return a valid object.

  Parameters:
    `xctxt` - The execution current context.
  Returns:
    A valid XObject.
  Throws:
    javax.xml.transform.TransformerException -
  Overrides:
    execute in class Expression

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