org.apache.xpath.functions
Class Function2Args

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.functions.Function
              |
              +--org.apache.xpath.functions.FunctionOneArg
                    |
                    +--org.apache.xpath.functions.Function2Args
Direct Known Subclasses:
FuncContains, FuncDocument, FuncKey, FuncStartsWith, FuncSubstringAfter, FuncSubstringBefore, Function3Args

public class Function2Args
extends FunctionOneArg

Base class for functions that accept two arguments.

See Also:
Serialized Form
Usage:
**For advanced use only**

Constructor Summary
Function2Args()
           
 
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 getArg1()
          Return the second argument passed to the function (at index 1).
 void setArg(Expression arg, int argNum)
          Set an argument expression for a function.
 
Methods inherited from class org.apache.xpath.functions.FunctionOneArg
getArg0, getExpression, setExpression
 
Methods inherited from class org.apache.xpath.functions.Function
callVisitors, execute, postCompileStep
 
Methods inherited from class org.apache.xpath.Expression
asIterator, asIteratorRaw, asNode, assertion, bool, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isStableNumber, num, warn, xstr
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Function2Args

public Function2Args()
Method Detail

getArg1

public Expression getArg1()
Return the second argument passed to the function (at index 1).
Returns:
An expression that represents the second argument passed to the 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.
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).
Overrides:
fixupVariables in class FunctionOneArg

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 1.
Overrides:
setArg in class FunctionOneArg

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 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

callArgVisitors

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

deepEquals

public boolean deepEquals(Expression expr)
Overrides:
deepEquals in class FunctionOneArg
See Also:
Expression.deepEquals(Expression)


Copyright 2006 Apache XML Project. All Rights Reserved.