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

#include <assert.h>
#include <pathan/dataItem/DataItemInstanceOf.hpp>
#include <pathan/SequenceType.hpp>
#include <pathan/DynamicContext.hpp>
#include <pathan/internal/factory/DatatypeFactory.hpp>
#include <pathan/ATBooleanOrDerived.hpp>
#include <pathan/dataItem/DataItemSequence.hpp>

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

DataItemInstanceOf::DataItemInstanceOf(DataItem* expr, SequenceType* exprType, XPath2MemoryManager* memMgr)
  : DataItemImpl(memMgr),
  _expr(expr),
  _exprType(exprType)
{
	setType(DataItem::INSTANCE_OF);
}

Sequence DataItemInstanceOf::collapseTreeInternal(DynamicContext* context, int ) const
{
  int flags=0;
  if(_exprType->getOccurrenceIndicator()==SequenceType::QUESTION_MARK ||
     _exprType->getOccurrenceIndicator()==SequenceType::EXACTLY_ONE)
    flags = DataItem::UNORDERED|DataItem::RETURN_TWO;
  Sequence toBeTested(_expr->collapseTree(context, flags));

  bool result = _exprType->matches(toBeTested, context);
  return Sequence(DatatypeFactory::POD2AT::createBoolean(context->getMemoryManager(), result, context), context->getMemoryManager());
}

DataItem* DataItemInstanceOf::staticResolution(StaticContext *context, StaticResolutionContext *src) {
  return resolveDataItem(_expr, context, src, true);
}

const DataItem *DataItemInstanceOf::getExpression() const {
  return _expr;
}

const SequenceType *DataItemInstanceOf::getSequenceType() const {
  return _exprType;
}

void DataItemInstanceOf::setExpression(DataItem *item) {
  _expr = item;
}