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/**
* Copyright (C) 2011 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 "pch.h"
#include "db/pipeline/document_source.h"
#include "db/pipeline/expression_context.h"
namespace mongo {
DocumentSource::DocumentSource(
const intrusive_ptr<ExpressionContext> &pCtx):
pSource(NULL),
step(-1),
pExpCtx(pCtx),
nRowsOut(0) {
}
DocumentSource::~DocumentSource() {
}
const char *DocumentSource::getSourceName() const {
static const char unknown[] = "[UNKNOWN]";
return unknown;
}
void DocumentSource::setSource(DocumentSource *pTheSource) {
verify(!pSource);
pSource = pTheSource;
}
bool DocumentSource::coalesce(
const intrusive_ptr<DocumentSource> &pNextSource) {
return false;
}
void DocumentSource::optimize() {
}
void DocumentSource::manageDependencies(
const intrusive_ptr<DependencyTracker> &pTracker) {
#ifdef MONGO_LATER_SERVER_4644
verify(false); // identify any sources that need this but don't have it
#endif /* MONGO_LATER_SERVER_4644 */
}
bool DocumentSource::advance() {
pExpCtx->checkForInterrupt(); // might not return
return false;
}
void DocumentSource::addToBsonArray(
BSONArrayBuilder *pBuilder, bool explain) const {
BSONObjBuilder insides;
sourceToBson(&insides, explain);
/* No statistics at this time
if (explain) {
insides.append("nOut", nOut);
}
*/
pBuilder->append(insides.done());
}
void DocumentSource::writeString(stringstream &ss) const {
BSONArrayBuilder bab;
addToBsonArray(&bab);
BSONArray ba(bab.arr());
ss << ba.toString(/* isArray */true);
// our toString should use standard string types.....
}
}
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