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// namespace.h
/**
* Copyright (C) 2008 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 <cstring>
#include <string>
#include "mongo/base/string_data.h"
namespace mongo {
#pragma pack(1)
/**
* This is used for storing a namespace on disk in a fixed witdh form
* it should only be used for that, not for passing internally
* for that, please use NamespaceString
*/
class Namespace {
public:
Namespace(const StringData& ns) {
*this = ns;
}
Namespace& operator=(const StringData& ns);
void kill() {
buf[0] = 0x7f;
}
bool operator==(const char* r) const {
return strcmp(buf, r) == 0;
}
bool operator==(const Namespace& r) const {
return strcmp(buf, r.buf) == 0;
}
bool operator!=(const char* r) const {
return strcmp(buf, r) != 0;
}
bool operator!=(const Namespace& r) const {
return strcmp(buf, r.buf) != 0;
}
bool hasDollarSign() const {
return strchr(buf, '$') != NULL;
}
int hash() const; // value returned is always > 0
size_t size() const {
return strlen(buf);
}
std::string toString() const {
return buf;
}
operator std::string() const {
return buf;
}
/* NamespaceDetails::Extra was added after fact to allow chaining of data blocks to support more
* than 10 indexes (more than 10 IndexDetails). It's a bit hacky because of this late addition
* with backward file support. */
std::string extraName(int i) const;
/* ends with $extr... -- when true an extra block not a normal NamespaceDetails block */
bool isExtra() const;
enum MaxNsLenValue {
// Maximum possible length of name any namespace, including special ones like $extra.
// This includes rum for the NUL byte so it can be used when sizing buffers.
MaxNsLenWithNUL = 128,
// MaxNsLenWithNUL excluding the NUL byte. Use this when comparing std::string lengths.
MaxNsLen = MaxNsLenWithNUL - 1,
// Maximum allowed length of fully qualified namespace name of any real collection.
// Does not include NUL so it can be directly compared to std::string lengths.
MaxNsColletionLen = MaxNsLen - 7 /*strlen(".$extra")*/,
};
private:
char buf[MaxNsLenWithNUL];
};
#pragma pack()
} // namespace mongo
#include "mongo/db/storage/mmap_v1/catalog/namespace-inl.h"
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