122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
// namespace_common.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <string>
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/**
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* this file contains basics utilities for handling namespaces
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*/
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namespace mongo {
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using std::string;
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/* in the mongo source code, "client" means "database". */
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const int MaxDatabaseNameLen = 256; // max str len for the db name, including null char
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/* e.g.
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NamespaceString ns("acme.orders");
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cout << ns.coll; // "orders"
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*/
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class NamespaceString {
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public:
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string db;
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string coll; // note collection names can have periods in them for organizing purposes (e.g. "system.indexes")
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NamespaceString( const char * ns ) { init(ns); }
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NamespaceString( const string& ns ) { init(ns.c_str()); }
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string ns() const { return db + '.' + coll; }
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bool isSystem() const { return strncmp(coll.c_str(), "system.", 7) == 0; }
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/**
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* @return true if ns is 'normal'. $ used for collections holding index data, which do not contain BSON objects in their records.
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* special case for the local.oplog.$main ns -- naming it as such was a mistake.
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*/
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static bool normal(const char* ns) {
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const char *p = strchr(ns, '$');
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if( p == 0 )
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return true;
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return strcmp( ns, "local.oplog.$main" ) == 0;
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}
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static bool special(const char *ns) {
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return !normal(ns) || strstr(ns, ".system.");
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}
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/**
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* samples:
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* good:
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* foo
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* bar
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* foo-bar
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* bad:
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* foo bar
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* foo.bar
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* foo"bar
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*
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* @param db - a possible database name
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* @return if db is an allowed database name
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*/
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static bool validDBName( const string& db ) {
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if ( db.size() == 0 || db.size() > 64 )
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return false;
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size_t good = strcspn( db.c_str() , "/\\. \"" );
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return good == db.size();
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}
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private:
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void init(const char *ns) {
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const char *p = strchr(ns, '.');
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if( p == 0 ) return;
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db = string(ns, p - ns);
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coll = p + 1;
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}
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};
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// "database.a.b.c" -> "database"
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inline void nsToDatabase(const char *ns, char *database) {
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const char *p = ns;
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char *q = database;
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while ( *p != '.' ) {
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if ( *p == 0 )
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break;
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*q++ = *p++;
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}
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*q = 0;
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if (q-database>=MaxDatabaseNameLen) {
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log() << "nsToDatabase: ns too long. terminating, buf overrun condition" << endl;
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dbexit( EXIT_POSSIBLE_CORRUPTION );
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}
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}
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inline string nsToDatabase(const char *ns) {
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char buf[MaxDatabaseNameLen];
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nsToDatabase(ns, buf);
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return buf;
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}
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inline string nsToDatabase(const string& ns) {
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size_t i = ns.find( '.' );
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if ( i == string::npos )
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return ns;
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return ns.substr( 0 , i );
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}
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}
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