/*******************************************************************************

 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial implementation

 *******************************************************************************/

#ifndef SWTAUTORELEASE_H

#define SWTAUTORELEASE_H

#include "swtapplication.h"

#include "jniutils.h"

namespace Java { namespace eSWT {

/**

 * Helper class for auto_ptr like resource management.

 * Allocate these objects on stack and let them release the resources

 * when the object goes out of scope.

 */

template<class T>

class AutoRelease

{

public:

    AutoRelease( T* aPointer, bool isArray = false )

        : mPointer( aPointer ), mArray( isArray )

        {

        }

    virtual ~AutoRelease()

        {

        release();

        }

    T* get()

        {

        return mPointer;

        }

    void reset(T* aPointer)

        {

        release();

        mPointer = aPointer;

        }

private:

    void release()

        {

        if( mArray )

            {

            delete[] mPointer;

            }

        else

            {

            delete mPointer;

            }

        mPointer = NULL;

        }

private:

    T* mPointer;

    bool mArray;

};

/**

 * Helper class to automatically call ReleaseStringChars for a Java

 * string chars object obtained from a call to GetStringChars.

 */

class AutoReleaseStringChars

{

public:

    AutoReleaseStringChars( JNIEnv* aJniEnv, jstring aString, const jchar* aPointer )

        : mJniEnv( aJniEnv ), mString( aString ), mPointer( aPointer )

        {}

    virtual ~AutoReleaseStringChars()

        {

        mJniEnv->ReleaseStringChars( mString, mPointer );

        }

protected:

    JNIEnv*      mJniEnv;

    jstring      mString;

    const jchar* mPointer;

};

/**

 * Helper class to automatically call DeleteLocalRef to free the

 * given Java class reference.

 */

class AutoDeleteLocalClassRef

{

public:

    AutoDeleteLocalClassRef( JNIEnv* aJniEnv, jclass aClazz )

        : mJniEnv( aJniEnv ), mClazz( aClazz )

        {}

    virtual ~AutoDeleteLocalClassRef()

        {

        mJniEnv->DeleteLocalRef( mClazz );

        }

protected:

    JNIEnv* mJniEnv;

    jclass mClazz;

};

/**

 * Helper class to automatically free ExecExceptionHandlers.

 */

class AutoPopExecStack

{

public:

    AutoPopExecStack(QObject* aObject)

        {

        swtApp->jniUtils().enterExec(aObject);

        }

    virtual ~AutoPopExecStack()

        {

        swtApp->jniUtils().leaveExec();

        }

};

}}

#endif // SWTAUTORELEASE_H