org.jaxen.function

Class RoundFunction

java.lang.Object

org.jaxen.function.RoundFunction

All Implemented Interfaces:

Function

public class RoundFunction
extends Object
implements Function

4.4 number round(number)

The round function returns the number that is closest to the argument and that is an integer. If there are two such numbers, then the one that is closest to positive infinity is returned. If the argument is NaN, then NaN is returned. If the argument is positive infinity, then positive infinity is returned. If the argument is negative infinity, then negative infinity is returned. If the argument is positive zero, then positive zero is returned. If the argument is negative zero, then negative zero is returned. If the argument is less than zero, but greater than or equal to -0.5, then negative zero is returned.

Author:

bob mcwhirter (bob @ werken.com)

See Also:

Section 4.4 of the XPath Specification

Constructor Summary

Constructors

Constructor and Description
RoundFunction() Create a new RoundFunction object.

Method Summary

Modifier and Type	Method and Description
Object	call(Context context, List args) Returns the nearest integer to the number.
static Double	evaluate(Object obj, Navigator nav) Returns the integer nearest to the argument.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundFunction

public RoundFunction()

Create a new RoundFunction object.

Method Detail

call

public Object call(Context context,
                   List args)
            throws FunctionCallException

Returns the nearest integer to the number.

Specified by:

call in interface Function

Parameters:

context - the context at the point in the expression when the function is called

args - a list with exactly one item which will be converted to a Double as if by the XPath number() function

Returns:

a Double containing the integer nearest to args.get(0)

Throws:

FunctionCallException - if args has more or less than one item

evaluate

public static Double evaluate(Object obj,
                              Navigator nav)

Returns the integer nearest to the argument. If necessary, the argument is first converted to a Double as if by the XPath number() function.

Parameters:

obj - the object to be rounded

nav - ignored

Returns:

the integer nearest to obj