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// namespace-inl.h
/**
* Copyright (C) 2009 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
namespace mongo {
inline Namespace& Namespace::operator=(const StringData& ns) {
// we fill the remaining space with all zeroes here. as the full Namespace struct is in
// the datafiles (the .ns files specifically), that is helpful as then they are deterministic
// in the bytes they have for a given sequence of operations. that makes testing and debugging
// the data files easier.
//
// if profiling indicates this method is a significant bottleneck, we could have a version we
// use for reads which does not fill with zeroes, and keep the zeroing behavior on writes.
//
memset( buf, 0, MaxNsLen );
uassert( 10080 , "ns name too long, max size is 128", ns.size() < MaxNsLen - 1);
ns.copyTo( buf, true );
return *this;
}
inline string Namespace::extraName(int i) const {
char ex[] = "$extra";
ex[5] += i;
string s = string(buf) + ex;
massert( 10348 , "$extra: ns name too long", s.size() < MaxNsLen);
return s;
}
inline bool Namespace::isExtra() const {
const char *p = strstr(buf, "$extr");
return p && p[5] && p[6] == 0; //==0 important in case an index uses name "$extra_1" for example
}
inline int Namespace::hash() const {
unsigned x = 0;
const char *p = buf;
while ( *p ) {
x = x * 131 + *p;
p++;
}
return (x & 0x7fffffff) | 0x8000000; // must be > 0
}
} // namespace mongo
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