org.htmlunit.xpath.functions

Class FunctionDef1Arg

java.lang.Object

org.htmlunit.xpath.Expression

org.htmlunit.xpath.functions.Function

org.htmlunit.xpath.functions.FunctionOneArg

org.htmlunit.xpath.functions.FunctionDef1Arg

All Implemented Interfaces:

SourceLocator, ExpressionNode, XPathVisitable

Direct Known Subclasses:

FuncLocalPart, FuncNamespace, FuncNormalizeSpace, FuncNumber, FuncQname, FuncString, FuncStringLength

public class FunctionDef1Arg
extends FunctionOneArg

Base class for functions that accept one argument that can be defaulted if not specified.

Constructor Summary

Constructors

Constructor and Description
FunctionDef1Arg()

Method Summary

Modifier and Type	Method and Description
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.
protected int	getArg0AsNode(XPathContext xctxt) Execute the first argument expression that is expected to return a nodeset.
protected double	getArg0AsNumber(XPathContext xctxt) Execute the first argument expression that is expected to return a number.
protected XString	getArg0AsString(XPathContext xctxt) Execute the first argument expression that is expected to return a string.
protected void	reportWrongNumberArgs() Constructs and throws a WrongNumberArgException with the appropriate message for this function object.

Methods inherited from class org.htmlunit.xpath.functions.FunctionOneArg

callArgVisitors, deepEquals, setArg

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

callVisitors, execute, postCompileStep

Methods inherited from class org.htmlunit.xpath.Expression

asIterator, asNode, assertion, bool, error, execute, execute, execute, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionDef1Arg

public FunctionDef1Arg()

Method Detail

getArg0AsNode

protected int getArg0AsNode(XPathContext xctxt)
                     throws TransformerException

Execute the first argument expression that is expected to return a nodeset. If the argument is null, then return the current context node.

Parameters:

xctxt - Runtime XPath context.

Returns:

The first node of the executed nodeset, or the current context node if the first argument is null.

Throws:

TransformerException - if an error occurs while executing the argument expression.

getArg0AsString

protected XString getArg0AsString(XPathContext xctxt)
                           throws TransformerException

Execute the first argument expression that is expected to return a string. If the argument is null, then get the string value from the current context node.

Parameters:

xctxt - Runtime XPath context.

Returns:

The string value of the first argument, or the string value of the current context node if the first argument is null.

Throws:

TransformerException - if an error occurs while executing the argument expression.

getArg0AsNumber

protected double getArg0AsNumber(XPathContext xctxt)
                          throws TransformerException

Execute the first argument expression that is expected to return a number. If the argument is null, then get the number value from the current context node.

Parameters:

xctxt - Runtime XPath context.

Returns:

The number value of the first argument, or the number value of the current context node if the first argument is null.

Throws:

TransformerException - if an error occurs while executing the argument expression.

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.

Overrides:

checkNumberArgs in class FunctionOneArg

Parameters:

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

Throws:

WrongNumberArgsException - if any

reportWrongNumberArgs

protected void reportWrongNumberArgs()
                              throws WrongNumberArgsException

Constructs and throws a WrongNumberArgException with the appropriate message for this function object. This method is meant to be overloaded by derived classes so that the message will be as specific as possible.

Overrides:

reportWrongNumberArgs in class FunctionOneArg

Throws:

WrongNumberArgsException - if any

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

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

Overrides:

canTraverseOutsideSubtree in class FunctionOneArg

Returns:

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