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/**
* Copyright (C) 2016 MongoDB 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.
*/
#pragma once
#include <vector>
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/db/pipeline/value.h"
#include "mongo/db/pipeline/value_comparator.h"
#include "mongo/stdx/functional.h"
namespace mongo {
namespace document_path_support {
/**
* Calls 'callback' once for each value found at 'path' in the document 'doc'. If an array value is
* found at 'path', it is expanded and 'callback' is invoked once for each value within the array.
*
* For example, 'callback' will be invoked on the values 1, 1, {a: 1}, 2 and 3 are on the path "x.y"
* in the document {x: [{y: 1}, {y: 1}, {y: {a: 1}}, {y: [2, 3]}, 3, 4]}.
*/
void visitAllValuesAtPath(const Document& doc,
const FieldPath& path,
stdx::function<void(const Value&)> callback);
/**
* Returns the element at 'path' in 'doc', or a missing Value if the path does not fully exist.
*
* Returns ErrorCodes::InternalError if an array is encountered along the path or at the end of the
* path.
*/
StatusWith<Value> extractElementAlongNonArrayPath(const Document& doc, const FieldPath& path);
/**
* Extracts 'paths' from the input document and returns a BSON object containing only those paths.
*/
BSONObj documentToBsonWithPaths(const Document&, const std::set<std::string>& paths);
/**
* Extracts 'paths' from the input document to a flat document.
*
* This does *not* traverse arrays when extracting values from dotted paths. For example, the path
* "a.b" will not populate the result document if the input document is {a: [{b: 1}]}.
*/
template <class Container>
Document extractPathsFromDoc(const Document& doc, const Container& paths) {
MutableDocument result;
for (const auto& field : paths) {
result.addField(field.fullPath(), doc.getNestedField(field));
}
return result.freeze();
}
} // namespace document_path_support
} // namespace mongo
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