org.apache.xpath.functions

Class FunctionOneArg

Implemented Interfaces:
ExpressionNode, ExpressionOwner, java.io.Serializable, SourceLocator, XPathVisitable
Known Direct Subclasses:
FuncBoolean, FuncCeiling, FuncCount, FuncExtElementAvailable, FuncExtFunctionAvailable, FuncFloor, FuncId, FuncLang, FuncNot, FuncRound, FuncSum, FuncSystemProperty, Function2Args, FunctionDef1Arg, FuncUnparsedEntityURI

public class FunctionOneArg
extends Function
implements ExpressionOwner

Base class for functions that accept one argument.
See Also:
Serialized Form

Method Summary

void
callArgVisitors(XPathVisitor visitor)
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.
boolean
deepEquals(Expression expr)
void
fixupVariables(java.util.Vector vars, int globalsSize)
This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
Expression
getArg0()
Return the first argument passed to the function (at index 0).
Expression
getExpression()
void
setArg(Expression arg, int argNum)
Set an argument expression for a function.
void
setExpression(Expression exp)

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

callArgVisitors, callVisitors, checkNumberArgs, deepEquals, execute, postCompileStep, setArg

Methods inherited from class org.apache.xpath.Expression

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

Method Details

callArgVisitors

public void callArgVisitors(XPathVisitor visitor)
Overrides:
callArgVisitors in interface Function
See Also:
XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside the current subtree.
Overrides:
canTraverseOutsideSubtree in interface Expression
Returns:
true if traversal outside the context node's subtree can occur.

checkNumberArgs

public void checkNumberArgs(int argNum)
            throws WrongNumberArgsException
Check that the number of arguments passed to this function is correct.
Overrides:
checkNumberArgs in interface Function
Parameters:
argNum - The number of arguments that is being passed to the function.

deepEquals

public boolean deepEquals(Expression expr)
Overrides:
deepEquals in interface Function

fixupVariables

public void fixupVariables(java.util.Vector vars,
                           int globalsSize)
This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
Overrides:
fixupVariables in interface 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).

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.

getExpression

public Expression getExpression()
Specified by:
getExpression in interface ExpressionOwner

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.
Overrides:
setArg in interface Function
Parameters:
arg - non-null expression that represents the argument.
argNum - The argument number index.
Throws:
WrongNumberArgsException - If the argNum parameter is greater than 0.

setExpression

public void setExpression(Expression exp)
Specified by:
setExpression in interface ExpressionOwner

Copyright B) 2004 Apache XML Project. All Rights Reserved.