////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////

#include "CollectionScanner.h"

using namespace arangodb::aql;

CollectionScanner::CollectionScanner(arangodb::AqlTransaction* trx,
                                     std::string const& collection,
                                     bool readRandom)
    : _cursor(trx->indexScan(collection,
                             (readRandom ? Transaction::CursorType::ANY
                                         : Transaction::CursorType::ALL),
                             "", VPackSlice(), 0, UINT64_MAX, 1000, false)) {
      TRI_ASSERT(_cursor.successful());
    }

CollectionScanner::~CollectionScanner() {}

VPackSlice CollectionScanner::scan(size_t batchSize) {
  if (!_cursor.hasMore()) {
    VPackSlice empty;
    return empty;
  }
  _cursor.getMore(batchSize, true);
  return _cursor.slice();
}

int CollectionScanner::forward(size_t batchSize, uint64_t& skipped) {
  return _cursor.skip(batchSize, skipped);
}

void CollectionScanner::reset() {
  _cursor.reset();
}