55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
// @file querypattern.cpp - Query pattern matching for selecting similar plans given similar queries.
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/* Copyright 2011 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "querypattern.h"
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namespace mongo {
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/** for testing only - speed unimportant */
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bool QueryPattern::operator==( const QueryPattern &other ) const {
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bool less = operator<( other );
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bool more = other.operator<( *this );
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assert( !( less && more ) );
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return !( less || more );
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}
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/** for testing only - speed unimportant */
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bool QueryPattern::operator!=( const QueryPattern &other ) const {
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return !operator==( other );
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}
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void QueryPattern::setSort( const BSONObj sort ) {
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_sort = normalizeSort( sort );
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}
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BSONObj QueryPattern::normalizeSort( const BSONObj &spec ) {
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if ( spec.isEmpty() )
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return spec;
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int direction = ( spec.firstElement().number() >= 0 ) ? 1 : -1;
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BSONObjIterator i( spec );
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BSONObjBuilder b;
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while( i.moreWithEOO() ) {
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BSONElement e = i.next();
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if ( e.eoo() )
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break;
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b.append( e.fieldName(), direction * ( ( e.number() >= 0 ) ? -1 : 1 ) );
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}
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return b.obj();
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}
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} // namespace mongo
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