org.ucl.xpath.function
Class FnAbs

java.lang.Object
  org.ucl.xpath.function.Function
      org.ucl.xpath.function.FnAbs

public class FnAbs

extends Function

Returns the absolute value of $arg. If $arg is negative returns -$arg otherwise returns $arg. If type of $arg is one of the four numeric types xs:float, xs:double, xs:decimal or xs:integer the type of the return is the same as the type of $arg. If the type of $arg is a type derived from one of the numeric types, the type of the return is the base numeric type. For xs:float and xs:double arguments, if the argument is positive zero (+0) or negative zero (-0), then positive zero (+0) is returned. If the argument is positive or negative infinity, positive infinity is returned.

Field Summary

Fields inherited from class org.ucl.xpath.function.Function

_arity, _fl, _name

Constructor Summary

FnAbs()
Constructor for FnAbs.

Method Summary

ResultSequence	evaluate(java.util.Collection args) Evaluate arguments.
static ResultSequence	fn_abs(ResultSequence arg) Absolute value operation.
static NumericType	get_single_numeric_arg(ResultSequence arg) Obtain numeric value from expression.

Methods inherited from class org.ucl.xpath.function.Function

arity, convert_argument, convert_arguments, dynamic_context, name, set_function_library, signature, signature, signature, static_context

Methods inherited from class java.lang.Object

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

Constructor Detail

FnAbs

public FnAbs()

Constructor for FnAbs.

Method Detail

evaluate

public ResultSequence evaluate(java.util.Collection args)
                        throws DynamicError

Evaluate arguments.

Specified by:

evaluate in class Function

Parameters:

args - argument expressions.

Returns:

Result of evaluation.

Throws:

DynamicError - Dynamic error.

fn_abs

public static ResultSequence fn_abs(ResultSequence arg)
                             throws DynamicError

Absolute value operation.

Parameters:

arg - Result from the expressions evaluation.

Returns:

Result of fn:abs operation.

Throws:

DynamicError - Dynamic error.

get_single_numeric_arg

public static NumericType get_single_numeric_arg(ResultSequence arg)
                                          throws DynamicError

Obtain numeric value from expression.

Parameters:

arg - input expression.

Returns:

Resulting numeric type from the operation.

Throws:

DynamicError - Dynamic error.