org.apache.xpath.functions

Class FuncPosition

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.functions.Function

org.apache.xpath.functions.FuncPosition

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, XPathVisitable

public class FuncPosition
extends Function

Execute the Position() function.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FuncPosition()

Method Summary

Modifier and Type	Method and Description
XObject	execute(XPathContext xctxt) Execute the function.
void	fixupVariables(Vector vars, int globalsSize) No arguments to process, so this does nothing.
int	getPositionInContextNodeList(XPathContext xctxt) Get the position in the current context node list.
void	postCompileStep(Compiler compiler) Figure out if we're executing a toplevel expression.

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

callArgVisitors, callVisitors, checkNumberArgs, deepEquals, reportWrongNumberArgs, setArg

Methods inherited from class org.apache.xpath.Expression

asIterator, asIteratorRaw, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr

Methods inherited from class java.lang.Object

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

Constructor Detail

FuncPosition

public FuncPosition()

Method Detail

postCompileStep

public void postCompileStep(Compiler compiler)

Figure out if we're executing a toplevel expression. If so, we can't be inside of a predicate.

Overrides:

postCompileStep in class Function

getPositionInContextNodeList

public int getPositionInContextNodeList(XPathContext xctxt)

Get the position in the current context node list.

Parameters:

xctxt - Runtime XPath context.

Returns:

The current position of the itteration in the context node list, or -1 if there is no active context node list.

execute

public XObject execute(XPathContext xctxt)
                throws TransformerException

Execute the function. The function must return a valid object.

Overrides:

execute in class Function

Parameters:

xctxt - The current execution context.

Returns:

A valid XObject.

Throws:

TransformerException

fixupVariables

public void fixupVariables(Vector vars,
                           int globalsSize)

No arguments to process, so this does nothing.

Specified by:

fixupVariables in class Expression

Parameters:

vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame). NEEDSDOC @param globalsSize