weblogic.apache.xpath.functions
Class FunctionDef1Arg

java.lang.Object
  |
  +--weblogic.apache.xpath.Expression
        |
        +--weblogic.apache.xpath.functions.Function
              |
              +--weblogic.apache.xpath.functions.FunctionOneArg
                    |
                    +--weblogic.apache.xpath.functions.FunctionDef1Arg

Direct Known Subclasses:

FuncDoclocation, FuncGenerateId, 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.

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

FunctionDef1Arg()

Method Summary

boolean	Arg0IsNodesetExpr() Tell if the expression is a nodeset expression.
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 XMLString	getArg0AsString(XPathContext xctxt) Execute the first argument expression that is expected to return a string.

Methods inherited from class weblogic.apache.xpath.functions.FunctionOneArg

fixupVariables, getArg0, setArg

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

execute

Methods inherited from class weblogic.apache.xpath.Expression

asIterator, asNode, assertion, bool, error, execute, execute, executeCharsToContentHandler, 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

FunctionDef1Arg

public FunctionDef1Arg()

Method Detail

getArg0AsNode

protected int getArg0AsNode(XPathContext xctxt)
                     throws javax.xml.transform.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:

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

Arg0IsNodesetExpr

public boolean Arg0IsNodesetExpr()

Tell if the expression is a nodeset expression.

Returns:

true if the expression can be represented as a nodeset.

getArg0AsString

protected XMLString getArg0AsString(XPathContext xctxt)
                             throws javax.xml.transform.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:

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

getArg0AsNumber

protected double getArg0AsNumber(XPathContext xctxt)
                          throws javax.xml.transform.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:

javax.xml.transform.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.

Parameters:

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

Throws:

WrongNumberArgsException - if the number of arguments is not 0 or 1.

Overrides:

checkNumberArgs in class FunctionOneArg

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 FunctionOneArg