org.apache.xpath.functions

Class FuncSubstring

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.FuncSubstring

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

public class FuncSubstring
extends Function3Args

Execute the Substring() function.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FuncSubstring()

Method Summary

Modifier and Type	Method and Description
void	checkNumberArgs(int argNum) Check that the number of arguments passed to this function is correct.
XObject	execute(XPathContext xctxt) Execute the function.
protected void	reportWrongNumberArgs() Constructs and throws a WrongNumberArgException with the appropriate message for this function object.

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

callArgVisitors, canTraverseOutsideSubtree, deepEquals, fixupVariables, getArg2, setArg

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, 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

FuncSubstring

public FuncSubstring()

Method Detail

execute

public XObject execute(XPathContext xctxt)
                throws TransformerException

Execute the function. The function must return a valid object.

Overrides:

execute in class Function

Parameters:

xctxt - The current execution context.

Returns:

A valid XObject.

Throws:

TransformerException

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.

Overrides:

reportWrongNumberArgs in class Function3Args

Throws:

WrongNumberArgsException