org.apache.xpath.functions
Class FunctionOneArg

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

Direct Known Subclasses:

FuncBoolean, FuncCeiling, FuncCount, FuncExtElementAvailable, FuncExtFunctionAvailable, FuncFloor, FuncId, FuncLang, FuncNot, FuncRound, FuncSum, FuncSystemProperty, Function2Args, FunctionDef1Arg, FuncUnparsedEntityURI

public class FunctionOneArg

extends Function

**For advanced use only** Base class for functions that accept one argument.

See Also:

Serialized Form

Constructor Summary

FunctionOneArg()

Method Summary

boolean	canTraverseOutsideSubtree() Tell if this expression or it's subexpressions can traverse outside the current subtree.
void	checkNumberArgs(int argNum) Check that the number of arguments passed to this function is correct.
Expression	getArg0() Return the first argument passed to the function (at index 0).
void	setArg(Expression arg, int argNum) Set an argument expression for a function.

Methods inherited from class org.apache.xpath.functions.Function

execute

Methods inherited from class org.apache.xpath.Expression

assert, error, setSourceLocator, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionOneArg

public FunctionOneArg()

Method Detail

getArg0

public Expression getArg0()

Return the first argument passed to the function (at index 0).

Returns:

An expression that represents the first argument passed to the 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 greater than 0.

Overrides:

setArg in class Function

checkNumberArgs

public void checkNumberArgs(int argNum)
                     throws WrongNumberArgsException

Check that the number of arguments passed to this function is correct.

Parameters:

argNum - The number of arguments that is being passed to the function.

Throws:

WrongNumberArgsException -

Overrides:

checkNumberArgs in class Function

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

Tell if this expression or it's subexpressions can traverse outside the current subtree.

Returns:

true if traversal outside the context node's subtree can occur.

Overrides:

canTraverseOutsideSubtree in class Expression