Package org.loboevolution.apache.xpath.functions

Class Function2Args

java.lang.Object

org.loboevolution.apache.xpath.Expression

org.loboevolution.apache.xpath.functions.Function

org.loboevolution.apache.xpath.functions.FunctionOneArg

org.loboevolution.apache.xpath.functions.Function2Args

All Implemented Interfaces:

SourceLocator, ExpressionNode, XPathVisitable

Direct Known Subclasses:

FuncContains, FuncStartsWith, FuncSubstringAfter, FuncSubstringBefore, Function3Args

public class Function2Args
extends FunctionOneArg

Base class for functions that accept two arguments.

Constructor Summary

Constructors

Constructor	Description
Function2Args()

Method Summary

Modifier and Type	Method	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.
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.loboevolution.apache.xpath.functions.Function

callVisitors, execute, postCompileStep

Methods inherited from class org.loboevolution.apache.xpath.Expression

asIterator, asNode, assertion, bool, error, execute, execute, execute, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num

Methods inherited from class java.lang.Object

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

Constructor Details

Function2Args

public Function2Args()

Method Details

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 FunctionOneArg

Parameters:

arg - non-null expression that represents the argument.

argNum - The argument number index.

Throws:

WrongNumberArgsException - If the argNum parameter is beyond what is specified for this function.

checkNumberArgs

public void checkNumberArgs(int argNum)
                     throws WrongNumberArgsException

Check that the number of arguments passed to this function is correct. This method is meant to be overloaded by derived classes, to check for the number of arguments for a specific function type. This method is called by the compiler for static number of arguments checking.

Overrides:

checkNumberArgs in class FunctionOneArg

Parameters:

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

Throws:

WrongNumberArgsException - if any

reportWrongNumberArgs

protected void reportWrongNumberArgs()
                              throws WrongNumberArgsException

Constructs and throws a WrongNumberArgException with the appropriate message for this function object. This method is meant to be overloaded by derived classes so that the message will be as specific as possible.

Overrides:

reportWrongNumberArgs in class FunctionOneArg

Throws:

WrongNumberArgsException - if any

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

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

Overrides:

canTraverseOutsideSubtree in class FunctionOneArg

Returns:

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

callArgVisitors

public void callArgVisitors(XPathVisitor visitor)

Call the visitors for the function arguments.

Overrides:

callArgVisitors in class FunctionOneArg

deepEquals

public boolean deepEquals(Expression expr)

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

Overrides:

deepEquals in class FunctionOneArg

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.