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// @file namespacestring.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/>.
*/
#pragma once
#include <string>
namespace mongo {
using std::string;
/* in the mongo source code, "client" means "database". */
const int MaxDatabaseNameLen = 256; // max str len for the db name, including null char
/* e.g.
NamespaceString ns("acme.orders");
cout << ns.coll; // "orders"
*/
class NamespaceString {
public:
string db;
string coll; // note collection names can have periods in them for organizing purposes (e.g. "system.indexes")
NamespaceString( const char * ns ) { init(ns); }
NamespaceString( const string& ns ) { init(ns.c_str()); }
string ns() const { return db + '.' + coll; }
bool isSystem() const { return strncmp(coll.c_str(), "system.", 7) == 0; }
bool isCommand() const { return coll == "$cmd"; }
operator string() const { return ns(); }
bool operator==( const string& nsIn ) const { return nsIn == ns(); }
bool operator==( const char* nsIn ) const { return (string)nsIn == ns(); }
bool operator==( const NamespaceString& nsIn ) const { return nsIn.db == db && nsIn.coll == coll; }
bool operator!=( const string& nsIn ) const { return nsIn != ns(); }
bool operator!=( const char* nsIn ) const { return (string)nsIn != ns(); }
bool operator!=( const NamespaceString& nsIn ) const { return nsIn.db != db || nsIn.coll != coll; }
string toString() const { return ns(); }
/**
* @return true if ns is 'normal'. $ used for collections holding index data, which do not contain BSON objects in their records.
* special case for the local.oplog.$main ns -- naming it as such was a mistake.
*/
static bool normal(const char* ns) {
const char *p = strchr(ns, '$');
if( p == 0 )
return true;
return strcmp( ns, "local.oplog.$main" ) == 0;
}
static bool special(const char *ns) {
return !normal(ns) || strstr(ns, ".system.");
}
/**
* samples:
* good:
* foo
* bar
* foo-bar
* bad:
* foo bar
* foo.bar
* foo"bar
*
* @param db - a possible database name
* @return if db is an allowed database name
*/
static bool validDBName( const string& db ) {
if ( db.size() == 0 || db.size() > 64 )
return false;
size_t good = strcspn( db.c_str() , "/\\. \"" );
return good == db.size();
}
/**
* samples:
* good:
* foo.bar
* bad:
* foo.
*
* @param dbcoll - a possible collection name of the form db.coll
* @return if db.coll is an allowed collection name
*/
static bool validCollectionName(const char* dbcoll){
const char *c = strchr( dbcoll, '.' ) + 1;
return normal(dbcoll) && c && *c;
}
private:
void init(const char *ns) {
const char *p = strchr(ns, '.');
if( p == 0 ) return;
db = string(ns, p - ns);
coll = p + 1;
}
};
// "database.a.b.c" -> "database"
inline void nsToDatabase(const char *ns, char *database) {
const char *p = ns;
char *q = database;
while ( *p != '.' ) {
if ( *p == 0 )
break;
*q++ = *p++;
}
*q = 0;
if (q-database>=MaxDatabaseNameLen) {
log() << "nsToDatabase: ns too long. terminating, buf overrun condition" << endl;
dbexit( EXIT_POSSIBLE_CORRUPTION );
}
}
inline string nsToDatabase(const char *ns) {
char buf[MaxDatabaseNameLen];
nsToDatabase(ns, buf);
return buf;
}
inline string nsToDatabase(const string& ns) {
size_t i = ns.find( '.' );
if ( i == string::npos )
return ns;
return ns.substr( 0 , i );
}
}
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