javacommons/gcfbase/inc/nativestreambase.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 12:27:20 +0300
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Base class for all native implementation of stream types
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*
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*/
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#ifndef NATIVESTREAMBASE_H
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#define NATIVESTREAMBASE_H
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#include <jni.h>
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namespace java
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{
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/**
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* This is the base class for Native Peer of streams.
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* StreamConnectionBase in will make calls to the native side to get/send data.
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* It will have stored a handle to the Object and uses it to call these methods.
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*
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* Usage:
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* Please ensure that this class comes first in the line of inheritance as shown.
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*
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* @code
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* class StreamConnectionX : public NativeStreamBase, public AllOtherClasses
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* @endcode
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*
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*/
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class NativeStreamBase
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{
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public:
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    /**
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    * ReadBytes is called once the buffer at the InputStream in Java runs
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    * out of data.
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    * How this function should be called.
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    * @param[in]  aJavaBuffer: A byte array of length 512 bytes
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    * @return return should be the number of bytes read. If error, then the
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    *         value of errno should be negated and returned. (return -errno)
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    */
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    virtual int readBytes(JNIEnv& aJni, jbyteArray aJavaBuffer) = 0;
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    /**
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    * WriteBytes is called once buffer at the OutputStream in Java overflows.
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    * It is also called if flush() is called at the Java side.
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    * How this function should be called.
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    * @param[in]  aJavaBuffer: A byte array of length aLength
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    * @return return should be the number of bytes written. If error, then the
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    *         value of errno should be negated and returned. (return -errno)
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    */
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    virtual int writeBytes(JNIEnv& aJni, jbyteArray aJavaBuffer,
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                           int aOffset, int aLength) = 0;
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    /**
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    * StopReading is called once InputStream is closed from the Application.
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    */
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    virtual void stopReading() = 0;
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    /**
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    * StopWriting is called once OutputStream is closed from the Application.
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    */
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    virtual void stopWriting() = 0;
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    /**
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    * Defines the size of the buffer to be held on the native side. Should be
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    * same as the buffer in the InputStream
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    */
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    int mBufferSize;
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    /**
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     * SetBufferSize is called during StreamConnectionBase construction.
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     * This is to keep both Java and Native Buffers in sync.
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     */
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    void setBufferSize(int aSize)
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    {
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        mBufferSize = aSize;
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    }
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    virtual int available()
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    {
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        return 0;
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    }
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};
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}  //end namespace java
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#endif // NATIVESTREAMBASE_H