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 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
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Function
public Function()
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
WebLogic classes and methods that do not appear in this reference are not public and are not supported.