org.apache.xpath.functions

Class FunctionOneArg

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.functions.Function

org.apache.xpath.functions.FunctionOneArg

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

Direct Known 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

Constructor Summary

Constructors

Constructor and Description
FunctionOneArg()

Method Summary

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	getArg0() Return the first argument passed to the function (at index 0).
Expression	getExpression() Get the raw Expression object that this class wraps.
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.
void	setExpression(Expression exp) Set the raw expression object for this object.

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

FunctionOneArg

public FunctionOneArg()

Method Detail

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.

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 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.

checkNumberArgs

public void checkNumberArgs(int argNum)
                     throws WrongNumberArgsException

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

Overrides:

checkNumberArgs in class Function

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.

Overrides:

reportWrongNumberArgs in class Function

Throws:

WrongNumberArgsException

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

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

Overrides:

canTraverseOutsideSubtree in class Expression

Returns:

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

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.

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).

callArgVisitors

public void callArgVisitors(XPathVisitor visitor)

Description copied from class: Function

Call the visitors for the function arguments.

Overrides:

callArgVisitors in class Function

See Also:

XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)

getExpression

public Expression getExpression()

Description copied from interface: ExpressionOwner

Get the raw Expression object that this class wraps.

Specified by:

getExpression in interface ExpressionOwner

Returns:

the raw Expression object, which should not normally be null.

See Also:

ExpressionOwner.getExpression()

setExpression

public void setExpression(Expression exp)

Description copied from interface: ExpressionOwner

Set the raw expression object for this object.

Specified by:

setExpression in interface ExpressionOwner

Parameters:

exp - the raw Expression object, which should not normally be null.

See Also:

ExpressionOwner.setExpression(Expression)

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 Function

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)