XnLogWriterBase.h

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/*****************************************************************************
*                                                                            *
*  OpenNI 1.x Alpha                                                          *
*  Copyright (C) 2012 PrimeSense Ltd.                                        *
*                                                                            *
*  This file is part of OpenNI.                                              *
*                                                                            *
*  Licensed 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 __XN_LOG_WRITER_BASE_H__
#define __XN_LOG_WRITER_BASE_H__
 
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include <XnLogTypes.h>
#include <XnLog.h>
 
//---------------------------------------------------------------------------
// Types
//---------------------------------------------------------------------------
class XnLogWriterBase
{
public:
    XnLogWriterBase() : m_bRegistered(FALSE)
    {
        m_cObject.pCookie = this;
        m_cObject.WriteEntry = WriteEntryCallback;
        m_cObject.WriteUnformatted = WriteUnformattedCallback;
        m_cObject.OnConfigurationChanged = OnConfigurationChangedCallback;
        m_cObject.OnClosing = OnClosingCallback;
    }
 
    virtual ~XnLogWriterBase()
    {
        Unregister();
    }
 
    XnStatus Register()
    {
        XnStatus nRetVal = XN_STATUS_OK;
        
        if (!m_bRegistered)
        {
            OnRegister();
 
            nRetVal = xnLogRegisterLogWriter(&m_cObject);
            if (nRetVal != XN_STATUS_OK)
            {
                OnUnregister();
                return (nRetVal);
            }
 
            m_bRegistered = TRUE;
        }
        
        return (XN_STATUS_OK);
    }
 
    void Unregister()
    {
        if (m_bRegistered)
        {
            xnLogUnregisterLogWriter(&m_cObject);
            m_bRegistered = FALSE;
 
            OnUnregister();
        }
    }
 
    inline XnBool IsRegistered() { return m_bRegistered; }
 
    virtual void WriteEntry(const XnLogEntry* pEntry) = 0;
    virtual void WriteUnformatted(const XnChar* strMessage) = 0;
    virtual void OnConfigurationChanged() {};
    virtual void OnClosing() 
    {
        Unregister();
    };
 
    operator const XnLogWriter*() const
    {
        return &m_cObject;
    }
 
protected:
    virtual void OnRegister() {}
    virtual void OnUnregister() {}
 
private:
    static void XN_CALLBACK_TYPE WriteEntryCallback(const XnLogEntry* pEntry, void* pCookie)
    {
        XnLogWriterBase* pThis = (XnLogWriterBase*)pCookie;
        pThis->WriteEntry(pEntry);
    }
    static void XN_CALLBACK_TYPE WriteUnformattedCallback(const XnChar* strMessage, void* pCookie)
    {
        XnLogWriterBase* pThis = (XnLogWriterBase*)pCookie;
        pThis->WriteUnformatted(strMessage);
    }
    static void XN_CALLBACK_TYPE OnConfigurationChangedCallback(void* pCookie)
    {
        XnLogWriterBase* pThis = (XnLogWriterBase*)pCookie;
        pThis->OnConfigurationChanged();
    }
    static void XN_CALLBACK_TYPE OnClosingCallback(void* pCookie)
    {
        XnLogWriterBase* pThis = (XnLogWriterBase*)pCookie;
        pThis->OnClosing();
    }
 
    XnLogWriter m_cObject;
    XnBool m_bRegistered;
};
 
#endif // __XN_LOG_WRITER_BASE_H__