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/**
* 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/exec/working_set.h"
namespace mongo {
class AndCommon {
public:
/**
* If src has any data dest doesn't, add that data to dest.
*/
static void mergeFrom(WorkingSetMember* dest, const WorkingSetMember& src) {
// Both 'src' and 'dest' must have a RecordId (and they must be the same RecordId), as
// we should have just matched them according to this RecordId while doing an
// intersection.
verify(dest->hasLoc());
verify(src.hasLoc());
verify(dest->loc == src.loc);
// Merge computed data.
typedef WorkingSetComputedDataType WSCD;
for (WSCD i = WSCD(0); i < WSM_COMPUTED_NUM_TYPES; i = WSCD(i + 1)) {
if (!dest->hasComputed(i) && src.hasComputed(i)) {
dest->addComputed(src.getComputed(i)->clone());
}
}
if (dest->hasObj()) {
// The merged WSM that we're creating already has the full document, so there's
// nothing left to do.
return;
}
if (src.hasObj()) {
// 'src' has the full document but 'dest' doesn't so we need to copy it over.
dest->obj = src.obj;
// We have an object so we don't need key data.
dest->keyData.clear();
// 'dest' should have the same state as 'src'. If 'src' has an unowned obj, then
// 'dest' also should have an unowned obj; if 'src' has an owned obj, then dest
// should also have an owned obj.
dest->state = src.state;
// Now 'dest' has the full object. No more work to do.
return;
}
// If we're here, then both WSMs getting merged contain index keys. We need
// to merge the key data.
//
// This is N^2 but N is probably pretty small. Easy enough to revisit.
for (size_t i = 0; i < src.keyData.size(); ++i) {
bool found = false;
for (size_t j = 0; j < dest->keyData.size(); ++j) {
if (dest->keyData[j].indexKeyPattern == src.keyData[i].indexKeyPattern) {
found = true;
break;
}
}
if (!found) {
dest->keyData.push_back(src.keyData[i]);
}
}
if (src.isSuspicious)
dest->isSuspicious = true;
}
};
} // namespace mongo
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