/*

* Copyright (c) 2002-2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Class for reading data from Java SourceStream to native side

*

*/

#include <jdebug.h>

#include <JniEnvWrapper.h>

#include "cmmaeventsource.h"

#include "cmmasourcestream.h"

#include "cmmasourcestreamevent.h"

#include "mmmasourcestreamlistener.h"

const TInt KBufferSize = 4096; // data is read from java in 4k pieces

// CONSTRUCTION

CMMASourceStream* CMMASourceStream::NewL(JNIEnv* aJNIEnv,

        MMMAEventPoster* aEventPoster,

        jobject aJavaSourceStream,

        MMMASourceStreamListener* aListener

                                        )

{

    CMMASourceStream* self = CMMASourceStream::NewLC(aJNIEnv,

                             aEventPoster,

                             aJavaSourceStream,

                             aListener);

    CleanupStack::Pop();

    return self;

}

CMMASourceStream* CMMASourceStream::NewLC(JNIEnv* aJNIEnv,

        MMMAEventPoster* aEventPoster,

        jobject aJavaSourceStream,

        MMMASourceStreamListener* aListener

                                         )

{

    CMMASourceStream* self = new(ELeave) CMMASourceStream(aEventPoster,

            aListener);

    CleanupStack::PushL(self);

    self->ConstructL(aJNIEnv, aJavaSourceStream);

    return self;

}

CMMASourceStream::~CMMASourceStream()

{

    DEBUG("MMA::CMMASourceStream::~");

    delete iData;

    delete iReadEvent;

}

// Default constructor

CMMASourceStream::CMMASourceStream(MMMAEventPoster* aEventPoster,

                                   MMMASourceStreamListener* aListener)

        : iEventPoster(aEventPoster), iListener(aListener)

{

}

void CMMASourceStream::ConstructL(JNIEnv* aJNIEnv,

                                  jobject aJavaSourceStream)

{

    // JNI interface pointer can't be passed to different thread, so

    // it is needed to get valid JNI interface pointer for Event Server thread

    aJNIEnv = JniEnvWrapper::GetValidJniRef();

    jmethodID classMethodID =

        aJNIEnv->GetMethodID(aJNIEnv->GetObjectClass(aJavaSourceStream),

                             "read",

                             "(II)V");

    if (!classMethodID)

    {

        User::Leave(KErrNoMemory);

    }

    iReadEvent = new(ELeave) CMMASourceStreamEvent(classMethodID,

            aJavaSourceStream);

}

void CMMASourceStream::WriteL(const TUint8* aData,

                              TInt aLength,

                              TInt aState)

{

    if (aState < KErrNone)

    {

        // Inform listener on error case

        iListener->ReadCompletedL(aState, KNullDesC8());

        return;

    }

    if ((iData->Size() + aLength) > iData->Des().MaxSize())

    {

        // if data doesn't fit, reallocate more

        HBufC8* reallocated = iData->ReAlloc(iData->Des().MaxSize() + KBufferSize);

        if (!reallocated)  // realloc failed

        {

            // probably too much data read, so freeing used memory

            delete iData;

            iData = NULL;

            iListener->ReadCompletedL(KErrNoMemory, KNullDesC8());

            return;

        }

        iData = reallocated;

    }

    // java returns length -1 when completed

    if (aLength > 0)

    {

        iData->Des().Append(aData, aLength);

    }

    TInt currentRead = iData->Size() - iBufferPosition;

    if ((aState == ECompleted) ||

            (currentRead == iReadLength))

    {

        if (iReadLength == KMMAReadAllData)

        {

            iListener->ReadCompletedL(aState, *iData);

        }

        else

        {

            TPtrC8 data = iData->Mid(iBufferPosition, currentRead);

            iListener->ReadCompletedL(aState, data);

        }

    }

    else

    {

        // phase ready, inform the Player

        if (iReadLength == KMMAReadAllData)

        {

            iReadEvent->SetLength(KBufferSize);

        }

        else

        {

            iReadEvent->SetLength(iReadLength - currentRead);

        }

        // data has been requested, note will be sent

        iEventPoster->PostEvent(iReadEvent, CMMAEvent::ENotifyPriority);

    }

    DEBUG("MMA::CMMASourceStream::WriteL completed");

}

void CMMASourceStream::ReadL(TInt aLength)

{

    DEBUG_INT("MMA::CMMASourceStream::ReadL(%d)", aLength);

    __ASSERT_DEBUG(iData != NULL, User::Invariant());

    PrepareReadL();

    iBufferPosition = iData->Size();

    iReadLength = aLength;

    iReadEvent->SetLength(aLength);

    // data has been requested, note will be sent

    iEventPoster->PostEvent(iReadEvent, CMMAEvent::ENotifyPriority);

}

void CMMASourceStream::ReadAllL()

{

    // not reading again if iData already has data

    if (iData == NULL)

    {

        DEBUG("CMMASourceStream::ReadAllL: Buffer empty, reading from java");

        CreateDataBufferL(KBufferSize);

        ReadL(KMMAReadAllData);

    }

    else

    {

        DEBUG("CMMASourceStream::ReadAllL: Buffer not empty, ->ReadCompleteL");

        iListener->ReadCompletedL(ECompleted, *iData);

    }

}

void CMMASourceStream::PrepareReadL()

{

}

void CMMASourceStream::ResetData()

{

    delete iData;

    iData = NULL;

}

void CMMASourceStream::CreateDataBufferL(TInt aBufferSize)

{

    DEBUG("CMMASourceStream::CreateDataBufferL +");

    __ASSERT_DEBUG(iData == NULL, User::Invariant());

    iData = HBufC8::NewL(aBufferSize);

}

//  END OF FILE