/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _LOG4CXX_HELPERS_FILEINPUTSTREAM_H
#define _LOG4CXX_HELPERS_FILEINPUTSTREAM_H

#include <log4cxx/helpers/inputstream.h>
#include <log4cxx/file.h>
#include <memory>

namespace LOG4CXX_NS
{

namespace helpers
{

/**
 * InputStream implemented on top of APR file IO.
 *
 */
class LOG4CXX_EXPORT FileInputStream : public InputStream
{
	private:
		LOG4CXX_DECLARE_PRIVATE_MEMBER_PTR(FileInputStreamPrivate, m_priv)

	public:
		DECLARE_ABSTRACT_LOG4CXX_OBJECT(FileInputStream)
		BEGIN_LOG4CXX_CAST_MAP()
		LOG4CXX_CAST_ENTRY(FileInputStream)
		LOG4CXX_CAST_ENTRY_CHAIN(InputStream)
		END_LOG4CXX_CAST_MAP()

		/**
		 * Creates a FileInputStream by opening a connection to an actual
		 * file, the file named by the path name name in the file system.
		 *
		 * @param filename The system-dependent file name.
		 */
		FileInputStream(const LogString& filename);
		FileInputStream(const logchar* filename);

		/**
		 * Creates a FileInputStream by opening a connection to an actual
		 * file, the file named by the File object file in the file system.
		 *
		 * @param aFile The file to be opened for reading.
		 */
		FileInputStream(const File& aFile);

		virtual ~FileInputStream();

		/**
		 * Closes this file input stream and releases any system
		 * resources associated with the stream.
		 */
		void close() override;

		/**
		 * Reads a sequence of bytes into the given buffer.
		 *
		 * @param buf The buffer into which bytes are to be transferred.
		 * @return the total number of bytes read into the buffer, or -1 if there
		 *         is no more data because the end of the stream has been reached.
		 */
		int read(ByteBuffer& buf) override;

	private:

		FileInputStream(const FileInputStream&) = delete;
		FileInputStream(FileInputStream&&) = delete;

		FileInputStream& operator=(const FileInputStream&) = delete;
		void open(const LogString&);

};

LOG4CXX_PTR_DEF(FileInputStream);
} // namespace helpers

}  //namespace log4cxx

#endif //_LOG4CXX_HELPERS_FILEINPUTSTREAM_H
