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

#include <pathan/functions/FunctionLast.hpp>
#include <pathan/DynamicContext.hpp>
#include <pathan/ATDecimalOrDerived.hpp>
#include <pathan/internal/factory/DatatypeFactory.hpp>
#include <pathan/exceptions/FunctionException.hpp>
#include <pathan/dataItem/StaticResolutionContext.hpp>

const XMLCh FunctionLast::name[] = {
XERCES_CPP_NAMESPACE_QUALIFIER chLatin_l, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_a, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_s, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_t, XERCES_CPP_NAMESPACE_QUALIFIER chNull };

/**
 * fn:last() as xs:integer
**/

FunctionLast::FunctionLast(const VectorOfDataItems &args, XPath2MemoryManager* memMgr)
  : DataItemFunction(name,0, 0, "empty()", args, memMgr)
{
}

DataItem* FunctionLast::staticResolution(StaticContext *context, StaticResolutionContext *src) {
  src->contextSizeUsed(true);
  return resolveDataItems(_args, context, src, false);
}

Sequence FunctionLast::collapseTreeInternal(DynamicContext* context, int flags) const
{
  XPath2MemoryManager* memMgr = context->getMemoryManager();

  if(context->getContextItem()==NULL)
    DSLthrow(FunctionException,X("FunctionPosition::collapseTreeInternal"), X("Undefined context item"));
  return Sequence(DatatypeFactory::POD2AT::createInteger(memMgr, (long)context->getContextSize(), context), memMgr);
}