genesis-3d_engine/Engine/foundation/io/streamreader.cc

/****************************************************************************
Copyright (c) 2006, Radon Labs GmbH
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "stdneb.h"
#include "io/streamreader.h"

namespace IO
{
__ImplementClass(IO::StreamReader, 'STRR', Core::RefCounted);

//------------------------------------------------------------------------------
/**
*/
StreamReader::StreamReader() :
    isOpen(false),
    streamWasOpen(false)
{
    // empty
}

//------------------------------------------------------------------------------
/**
*/
StreamReader::~StreamReader()
{
    n_assert(!this->IsOpen());
}

//------------------------------------------------------------------------------
/**
    Attaches the reader to a stream. This will imcrement the refcount
    of the stream.
*/
void
StreamReader::SetStream(const GPtr<Stream>& s)
{
    this->stream = s;
}

//------------------------------------------------------------------------------
/**
    Get pointer to the attached stream. If there is no stream attached,
    an assertion will be thrown. Use HasStream() to determine if a stream
    is attached.
*/
const GPtr<Stream>&
StreamReader::GetStream() const
{
    return this->stream;
}

//------------------------------------------------------------------------------
/**
    Returns true if a stream is attached to the reader.
*/
bool
StreamReader::HasStream() const
{
    return this->stream.isvalid();
}

//------------------------------------------------------------------------------
/**
*/
bool
StreamReader::Eof() const
{
    n_assert(this->IsOpen());
    return this->stream->Eof();
}

//------------------------------------------------------------------------------
/**
*/
bool
StreamReader::Open()
{
    n_assert(!this->isOpen);
    n_assert(this->stream.isvalid());
    n_assert(this->stream->CanRead());
    if (this->stream->IsOpen())
    {
        n_assert((this->stream->GetAccessMode() == Stream::ReadAccess) || (this->stream->GetAccessMode() == Stream::ReadWriteAccess));
        this->streamWasOpen = true;
        this->isOpen = true;
    }
    else
    {
        this->streamWasOpen = false;
        this->stream->SetAccessMode(Stream::ReadAccess);
        this->isOpen = this->stream->Open();
    }
    return this->isOpen;
}

//------------------------------------------------------------------------------
/**
*/
void
StreamReader::Close()
{
    n_assert(this->isOpen);
    if ((!this->streamWasOpen) && stream->IsOpen())
    {
        this->stream->Close();
    }
    this->isOpen = false;
}

} // namespace IO