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/**
* 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 <string>
namespace mongo {
using std::string;
class BSONObj;
/**
* We need to know what 'type' an index is in order to plan correctly. We can't entirely rely
* on the key pattern to tell us what kind of index we have.
*
* An example of the Bad Thing That We Must Avoid:
* 1. Create a 2dsphere index in 2.4, insert some docs.
* 2. Downgrade to 2.2. Insert some more docs into the collection w/the 2dsphere
* index. 2.2 treats the index as a normal btree index and creates keys accordingly.
* 3. Using the 2dsphere index in 2.4 gives wrong results or assert-fails or crashes as
* the data isn't what we expect.
*/
enum IndexType {
INDEX_BTREE,
INDEX_2D,
INDEX_HAYSTACK,
INDEX_2DSPHERE,
INDEX_TEXT,
INDEX_HASHED,
};
/**
* We use the string representation of index names all over the place, so we declare them all
* once here.
*/
class IndexNames {
public:
static const string GEO_2D;
static const string GEO_HAYSTACK;
static const string GEO_2DSPHERE;
static const string TEXT;
static const string HASHED;
static const string BTREE;
/**
* True if is a regular (non-plugin) index or uses a plugin that existed before 2.4.
* These plugins are grandfathered in and allowed to exist in DBs with
* PDFILE_MINOR_VERSION_22_AND_OLDER
*/
static bool existedBefore24(const string& name);
/**
* Return the first string value in the provided object. For an index key pattern,
* a field with a non-string value indicates a "special" (not straight Btree) index.
*/
static string findPluginName(const BSONObj& keyPattern);
/**
* Is the provided access method name one we recognize?
*/
static bool isKnownName(const string& name);
/**
* Convert an index name to an IndexType.
*/
static IndexType nameToType(const string& accessMethod);
};
} // namespace mongo
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