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/**
* Copyright (C) 2015 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 <cstddef>
#include <iterator>
#include "mongo/base/data_range.h"
#include "mongo/base/data_range_cursor.h"
#include "mongo/db/jsobj.h"
namespace mongo {
namespace rpc {
/**
* A read-only view over a sequence of BSON documents.
*
* TODO:
* - Handle document validation
* - Currently this only supports a contiguous buffer of BSON documents,
* in the future it should support non-contiguous buffers as well.
*/
class DocumentRange {
public:
class const_iterator;
DocumentRange() = default;
DocumentRange(const char* begin, const char* end);
const_iterator begin() const;
const_iterator end() const;
// Get a ConstDataRange over the underlying raw buffer.
ConstDataRange data() const;
// Deep equality of all documents in both ranges.
friend bool operator==(const DocumentRange& lhs, const DocumentRange& rhs);
friend bool operator!=(const DocumentRange& lhs, const DocumentRange& rhs);
private:
ConstDataRange _range{nullptr, nullptr};
};
class DocumentRange::const_iterator : public std::iterator<std::forward_iterator_tag,
BSONObj,
std::ptrdiff_t,
const BSONObj*,
const BSONObj&> {
public:
const_iterator() = default;
reference operator*() const;
pointer operator->() const;
const_iterator& operator++();
const_iterator operator++(int);
friend bool operator==(const const_iterator&, const const_iterator&);
friend bool operator!=(const const_iterator&, const const_iterator&);
private:
// The only way to get a non-end iterator is from DocumentRange begin().
friend class DocumentRange;
explicit const_iterator(ConstDataRangeCursor cursor);
ConstDataRangeCursor _cursor{nullptr, nullptr};
BSONObj _obj;
};
} // namespace rpc
} // namespace mongo
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