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/**
* Copyright 2011 (c) 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/platform/basic.h"
#include "mongo/db/pipeline/document_source.h"
#include <boost/optional.hpp>
#include "mongo/db/jsobj.h"
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
using std::vector;
const char DocumentSourceRedact::redactName[] = "$redact";
DocumentSourceRedact::DocumentSourceRedact(const intrusive_ptr<ExpressionContext>& expCtx,
const intrusive_ptr<Expression>& expression)
: DocumentSource(expCtx)
, _expression(expression)
{ }
const char *DocumentSourceRedact::getSourceName() const {
return redactName;
}
static const Value descendVal = Value("descend");
static const Value pruneVal = Value("prune");
static const Value keepVal = Value("keep");
boost::optional<Document> DocumentSourceRedact::getNext() {
while (boost::optional<Document> in = pSource->getNext()) {
_variables->setRoot(*in);
_variables->setValue(_currentId, Value(*in));
if (boost::optional<Document> result = redactObject()) {
return result;
}
}
return boost::none;
}
Value DocumentSourceRedact::redactValue(const Value& in) {
const BSONType valueType = in.getType();
if (valueType == Object) {
_variables->setValue(_currentId, in);
const boost::optional<Document> result = redactObject();
if (result) {
return Value(*result);
}
else {
return Value();
}
}
else if (valueType == Array) {
// TODO dont copy if possible
vector<Value> newArr;
const vector<Value>& arr = in.getArray();
for (size_t i = 0; i < arr.size(); i++) {
if (arr[i].getType() == Object || arr[i].getType() == Array) {
const Value toAdd = redactValue(arr[i]) ;
if (!toAdd.missing()) {
newArr.push_back(toAdd);
}
}
else {
newArr.push_back(arr[i]);
}
}
return Value::consume(newArr);
}
else {
return in;
}
}
boost::optional<Document> DocumentSourceRedact::redactObject() {
const Value expressionResult = _expression->evaluate(_variables.get());
if (expressionResult == keepVal) {
return _variables->getDocument(_currentId);
}
else if (expressionResult == pruneVal) {
return boost::optional<Document>();
}
else if (expressionResult == descendVal) {
const Document in = _variables->getDocument(_currentId);
MutableDocument out;
out.copyMetaDataFrom(in);
FieldIterator fields(in);
while (fields.more()) {
const Document::FieldPair field(fields.next());
// This changes CURRENT so don't read from _variables after this
const Value val = redactValue(field.second);
if (!val.missing()) {
out.addField(field.first, val);
}
}
return out.freeze();
}
else {
uasserted(17053, str::stream() << "$redact's expression should not return anything "
<< "aside from the variables $$KEEP, $$DESCEND, and "
<< "$$PRUNE, but returned "
<< expressionResult.toString());
}
}
void DocumentSourceRedact::optimize() {
_expression = _expression->optimize();
}
Value DocumentSourceRedact::serialize(bool explain) const {
return Value(DOC(getSourceName() << _expression.get()->serialize(explain)));
}
intrusive_ptr<DocumentSource> DocumentSourceRedact::createFromBson(
BSONElement elem,
const intrusive_ptr<ExpressionContext>& expCtx) {
VariablesIdGenerator idGenerator;
VariablesParseState vps(&idGenerator);
Variables::Id currentId = vps.defineVariable("CURRENT"); // will differ from ROOT
Variables::Id decendId = vps.defineVariable("DESCEND");
Variables::Id pruneId = vps.defineVariable("PRUNE");
Variables::Id keepId = vps.defineVariable("KEEP");
intrusive_ptr<Expression> expression = Expression::parseOperand(elem, vps);
intrusive_ptr<DocumentSourceRedact> source = new DocumentSourceRedact(expCtx, expression);
// TODO figure out how much of this belongs in constructor and how much here.
// Set up variables. Never need to reset DESCEND, PRUNE, or KEEP.
source->_currentId = currentId;
source->_variables.reset(new Variables(idGenerator.getIdCount()));
source->_variables->setValue(decendId, descendVal);
source->_variables->setValue(pruneId, pruneVal);
source->_variables->setValue(keepId, keepVal);
return source;
}
}
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