/**
*    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.
*/

#pragma once

#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index/s2_common.h"
#include "mongo/db/jsobj.h"

namespace mongo {

class S2AccessMethod : public IndexAccessMethod {
public:
    S2AccessMethod(IndexCatalogEntry* btreeState, SortedDataInterface* btree);

    /**
     * Takes an index spec object for this index and returns a copy tweaked to conform to the
     * expected format.  When an index build is initiated, this function is called on the spec
     * object the user provides, and the return value of this function is the final spec object
     * that gets saved in the index catalog.
     *
     * Returns a non-OK status if 'specObj' is invalid.
     */
    static StatusWith<BSONObj> fixSpec(const BSONObj& specObj);

private:
    /**
     * Fills 'keys' with the keys that should be generated for 'obj' on this index.
     *
     * This function ignores the 'multikeyPaths' pointer because text indexes don't support tracking
     * path-level multikey information.
     *
     * If the 'multikeyPaths' pointer is non-null, then it must point to an empty vector. This
     * function resizes 'multikeyPaths' to have the same number of elements as the index key pattern
     * and fills each element with the prefixes of the indexed field that would cause this index to
     * be multikey as a result of inserting 'keys'.
     */
    void getKeys(const BSONObj& obj, BSONObjSet* keys, MultikeyPaths* multikeyPaths) const final;

    S2IndexingParams _params;

    // Null if this index orders strings according to the simple binary compare. If non-null,
    // represents the collator used to generate index keys for indexed strings.
    const CollatorInterface* _collator;
};

}  // namespace mongo