#include "../config/pathan_config.h"
/*
 * Copyright (c) 2001, DecisionSoft Limited All rights reserved.
 * Please see LICENSE.TXT for more information.
 */

#include <pathan/functions/FunctionCount.hpp>
#include <pathan/Sequence.hpp>
#include <pathan/ATDecimalOrDerived.hpp>
#include <pathan/DynamicContext.hpp>
#include <pathan/internal/factory/DatatypeFactory.hpp>

const XMLCh FunctionCount::name[] = {
XERCES_CPP_NAMESPACE_QUALIFIER chLatin_c, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_o, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_u, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_n, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_t, XERCES_CPP_NAMESPACE_QUALIFIER chNull };

/**
 * fn:count($arg as item()*) as xs:integer
**/

FunctionCount::FunctionCount(const VectorOfDataItems &args, XPath2MemoryManager* memMgr)
  : ConstantFoldingFunction(name,1, 1, "item()*", args, memMgr)
{
}

Sequence FunctionCount::collapseTreeInternal(DynamicContext* context, int flags) const
{
  Sequence arg = getParamNumber(1,context,DataItem::UNORDERED);
	return Sequence(DatatypeFactory::POD2AT::createInteger(context->getMemoryManager(), (long)arg.getLength(), context), context->getMemoryManager());
}