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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "mongo/util/assert_util.h"
namespace mongo {
// This interface represents any low-level input object such as file descriptor or file handle and
// provides methods to read data synchronously and query its state & metadata. It's modeled after
// C++ standard library ifstream.
//
// TODO Define SeekableInput interface which has the seek() method.
class StreamableInput {
public:
virtual ~StreamableInput() {}
virtual const char* getPath() const = 0;
void open() {
if (isOpen()) {
return;
}
doOpen();
}
void close() {
if (isOpen()) {
doClose();
}
tassert(7005013, "State must be 'closed' after closing an input", !isOpen());
}
int read(char* data, int count) {
uassert(7005010, "Input must have been opened before reading", isOpen());
return doRead(data, count);
}
virtual bool isOpen() const = 0;
virtual bool isGood() const = 0;
virtual bool isEof() const = 0;
virtual bool isFailed() const = 0;
protected:
virtual void doOpen() = 0;
virtual void doClose() = 0;
virtual int doRead(char* data, int count) = 0;
};
} // namespace mongo
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