org.ucl.xpath.function
Class FnExactlyOne

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

public class FnExactlyOne

extends Function

Returns $arg if it contains exactly one item. Otherwise, raises an error [err:FORG0005]. 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

FnExactlyOne()
Constructor for FnExactlyOne.

Method Summary

ResultSequence	evaluate(java.util.Collection args) Evaluate arguments.
static ResultSequence	exactly_one(java.util.Collection args) Exactly-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

FnExactlyOne

public FnExactlyOne()

Constructor for FnExactlyOne.

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.

exactly_one

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

Exactly-one operation.

Parameters:

args - Result from the expressions evaluation.

Returns:

Result of fn:exactly-one operation.

Throws:

DynamicError - Dynamic error.