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// index_set.cpp
/**
* 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/>.
*/
#include "mongo/bson/util/builder.h"
#include "mongo/db/index_set.h"
namespace mongo {
void IndexPathSet::addPath( const StringData& path ) {
string s;
if ( getCanonicalIndexField( path, &s ) ) {
_canonical.insert( s );
}
else {
_canonical.insert( path.toString() );
}
}
void IndexPathSet::clear() {
_canonical.clear();
}
bool IndexPathSet::mightBeIndexed( const StringData& path ) const {
StringData use = path;
string x;
if ( getCanonicalIndexField( path, &x ) )
use = StringData( x );
for ( std::set<string>::const_iterator i = _canonical.begin();
i != _canonical.end();
++i ) {
StringData idx( *i );
if ( _startsWith( use, idx ) )
return true;
if ( _startsWith( idx, use ) )
return true;
}
return false;
}
bool IndexPathSet::_startsWith( const StringData& a, const StringData& b ) const {
if ( !a.startsWith( b ) )
return false;
// make sure there is a dot or EOL right after
if ( a.size() == b.size() )
return true;
return a[b.size()] == '.';
}
bool getCanonicalIndexField( const StringData& fullName, string* out ) {
// check if fieldName contains ".$" or ".###" substrings (#=digit) and skip them
// however do not skip the first field even if it meets these criteria
if ( fullName.find( '.' ) == string::npos )
return false;
bool modified = false;
StringBuilder buf;
for ( size_t i=0; i<fullName.size(); i++ ) {
char c = fullName[i];
if ( c != '.' ) {
buf << c;
continue;
}
if ( i + 1 == fullName.size() ) {
// ends with '.'
buf << c;
continue;
}
// check for ".$", skip if present
if ( fullName[i+1] == '$' ) {
// only do this if its not something like $a
if ( i + 2 >= fullName.size() || fullName[i+2] == '.' ) {
i++;
modified = true;
continue;
}
}
// check for ".###" for any number of digits (no letters)
if ( isdigit( fullName[i+1] ) ) {
size_t j = i;
// skip digits
while ( j+1 < fullName.size() && isdigit( fullName[j+1] ) )
j++;
if ( j+1 == fullName.size() || fullName[j+1] == '.' ) {
// only digits found, skip forward
i = j;
modified = true;
continue;
}
}
buf << c;
}
if ( !modified )
return false;
*out = buf.str();
return true;
}
}
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