org.apache.xpath.functions

Class FunctionMultiArgs

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.functions.Function

org.apache.xpath.functions.FunctionOneArg

org.apache.xpath.functions.Function2Args

org.apache.xpath.functions.Function3Args

org.apache.xpath.functions.FunctionMultiArgs

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

Direct Known Subclasses:

FuncConcat

public class FunctionMultiArgs
extends Function3Args

Base class for functions that accept an undetermined number of multiple arguments.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FunctionMultiArgs()

Method Summary

Methods

Modifier and Type	Method and Description
void	callArgVisitors(XPathVisitor visitor) Call the visitors for the function arguments.
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) Compare this object with another object and see if they are equal, include the sub heararchy.
void	fixupVariables(Vector vars, int globalsSize) This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
Expression[]	getArgs() Return an expression array containing arguments at index 3 or greater.
protected void	reportWrongNumberArgs() Constructs and throws a WrongNumberArgException with the appropriate message for this function object.
void	setArg(Expression arg, int argNum) Set an argument expression for a function.

Methods inherited from class org.apache.xpath.functions.Function3Args

getArg2

Methods inherited from class org.apache.xpath.functions.Function2Args

getArg1

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, 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

FunctionMultiArgs

public FunctionMultiArgs()

Method Detail

getArgs

public Expression[] getArgs()

Return an expression array containing arguments at index 3 or greater.

Returns:

An array that contains the arguments at index 3 or greater.

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 class Function3Args

Parameters:

arg - non-null expression that represents the argument.

argNum - The argument number index.

Throws:

WrongNumberArgsException - If a derived class determines that the number of arguments is incorrect.

fixupVariables

public void fixupVariables(Vector vars,
                  int globalsSize)

This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.

Overrides:

fixupVariables in class Function3Args

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).

checkNumberArgs

public void checkNumberArgs(int argNum)
                     throws WrongNumberArgsException

Check that the number of arguments passed to this function is correct.

Overrides:

checkNumberArgs in class Function3Args

Parameters:

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

Throws:

WrongNumberArgsException

reportWrongNumberArgs

protected void reportWrongNumberArgs()
                              throws WrongNumberArgsException

Constructs and throws a WrongNumberArgException with the appropriate message for this function object. This class supports an arbitrary number of arguments, so this method must never be called.

Overrides:

reportWrongNumberArgs in class Function3Args

Throws:

WrongNumberArgsException

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

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

Overrides:

canTraverseOutsideSubtree in class Function3Args

Returns:

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

callArgVisitors

public void callArgVisitors(XPathVisitor visitor)

Description copied from class: Function

Call the visitors for the function arguments.

Overrides:

callArgVisitors in class Function3Args

See Also:

XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)

deepEquals

public boolean deepEquals(Expression expr)

Description copied from class: Expression

Compare this object with another object and see if they are equal, include the sub heararchy.

Overrides:

deepEquals in class Function3Args

Parameters:

expr - Another expression object.

Returns:

true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.

See Also:

Expression.deepEquals(Expression)