/**
*    Copyright (C) 2013 10gen Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*    As a special exception, the copyright holders give permission to link the
*    code of portions of this program with the OpenSSL library under certain
*    conditions as described in each individual source file and distribute
*    linked combinations including the program with the OpenSSL library. You
*    must comply with the GNU Affero General Public License in all respects for
*    all of the code used other than as permitted herein. If you modify file(s)
*    with this exception, you may extend this exception to your version of the
*    file(s), but you are not obligated to do so. If you do not wish to do so,
*    delete this exception statement from your version. If you delete this
*    exception statement from all source files in the program, then also delete
*    it in the license file.
*/

#include "mongo/db/index/btree_access_method.h"

#include <vector>

#include "mongo/base/status.h"
#include "mongo/db/index/btree_index_cursor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/keypattern.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/pdfile_private.h"

namespace mongo {

    // Standard Btree implementation below.
    BtreeAccessMethod::BtreeAccessMethod(IndexCatalogEntry* btreeState, RecordStore* rs )
        : BtreeBasedAccessMethod(btreeState, rs) {

        // The key generation wants these values.
        vector<const char*> fieldNames;
        vector<BSONElement> fixed;

        BSONObjIterator it(_descriptor->keyPattern());
        while (it.more()) {
            BSONElement elt = it.next();
            fieldNames.push_back(elt.fieldName());
            fixed.push_back(BSONElement());
        }

        if (0 == _descriptor->version()) {
            _keyGenerator.reset(new BtreeKeyGeneratorV0(fieldNames, fixed,
                _descriptor->isSparse()));
        } else if (1 == _descriptor->version()) {
            _keyGenerator.reset(new BtreeKeyGeneratorV1(fieldNames, fixed,
                _descriptor->isSparse()));
        } else {
            massert(16745, "Invalid index version for key generation.", false );
        }
    }

    void BtreeAccessMethod::getKeys(const BSONObj& obj, BSONObjSet* keys) {
        _keyGenerator->getKeys(obj, keys);
    }

}  // namespace mongo
