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/*
* Copyright (C) 2007-2011 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_NULL_STREAM_H
#define BU_NULL_STREAM_H
#include "bu/stream.h"
namespace Bu
{
/**
* Works a lot like /dev/null on *nix style systems. This class allows
* infinite reading and writing. All operatorns "succeed" even if they
* don't seem to do anything. This is great for testing writing code or
* doing dry runs. When reading, it will produce NULL bytes, so any
* application that would like the ability to produce null streams as a
* snap-in replacement for any other Bu::Stream, this is the right option.
*
* As an added feature, the NullStream will track how many bytes it was
* asked to read and write, allowing you to use it to determine how many
* bytes a write opretion would use without actually writing anything.
*/
class NullStream : public Bu::Stream
{
public:
NullStream();
virtual ~NullStream();
virtual void close();
virtual Bu::size read( void *pBuf, Bu::size nBytes );
virtual Bu::String readLine();
virtual Bu::size write( const void *pBuf, Bu::size nBytes );
using Bu::Stream::write;
virtual Bu::size tell();
virtual void seek( Bu::size offset );
virtual void setPos( Bu::size pos );
virtual void setPosEnd( Bu::size pos );
virtual bool isEos();
virtual bool isOpen();
virtual void flush();
virtual bool canRead();
virtual bool canWrite();
virtual bool isReadable();
virtual bool isWritable();
virtual bool isSeekable();
virtual bool isBlocking();
virtual void setBlocking( bool bBlocking=true );
virtual void setSize( Bu::size iSize );
virtual size getSize() const;
virtual size getBlockSize() const;
virtual Bu::String getLocation() const;
Bu::size getBytesRead() { return sRead; }
Bu::size getByetsWritten() { return sWrote; }
private:
Bu::size sRead;
Bu::size sWrote;
};
};
#endif
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