org.ucl.xpath.function
Class FnZeroOrOne

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

public class FnZeroOrOne

extends Function

Returns $arg if it contains zero or one items. Otherwise, raises an error [err:FORG0003]. The type of the result depends on the type of $arg.

Field Summary

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

_arity, _fl, _name

Constructor Summary

FnZeroOrOne()
Constructor for FnZeroOrOne.

Method Summary

ResultSequence	evaluate(java.util.Collection args) Evaluate arguments.
static ResultSequence	zero_or_one(java.util.Collection args) Zero-or-One operation.

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

FnZeroOrOne

public FnZeroOrOne()

Constructor for FnZeroOrOne.

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.

zero_or_one

public static ResultSequence zero_or_one(java.util.Collection args)
                                  throws DynamicError

Zero-or-One operation.

Parameters:

args - Result from the expressions evaluation.

Returns:

Result of fn:zero-or-one operation.

Throws:

DynamicError - Dynamic error.