/*

* Copyright (c) 2010 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: ECom interface for Email Client API

*

*/

#ifndef __MEMAILACTIONS

#define __MEMAILACTIONS

#include <e32cmn.h>

#include <memailmessage.h>

namespace EmailInterface {

class MMessageIterator;

class TEmailSortCriteria;

/**

* Observer interface for handling email search results.

*/

class MEmailSearchObserver

{

public:

    /**

     * Called when search has next message available.

     * This callback is called several times until all results

     * have been delivered.

     *

     * @param message found in search, ownership is transferred.

     *          

     */ 

    virtual void HandleResultL( 

        MEmailMessage* aMessage ) = 0;

    /**

     * Notifies that the search has completed and no more results are expected.

     */

    virtual void SearchCompletedL() = 0;

};

/**

 * Search interface for messages. Results are provided asynchronoysly.

 * By default all found mailboxes are included in search.

 * @code

   MEmailMailbox* mailbox = NULL;

   // obtain mailbox here... 

   // ...and now get search interface

   MEmailMessageSearchAsync* search = mailbox->MessageSearchL();

   CleanupReleasePushL( *search );

   TEmailSortCriteria criteria;

   criteria.iAscending = ETrue;

   criteria.iField = TEmailSortCriteria::EByDate;                 

   search->SetSortCriteriaL( criteria );

   search->StartSearchL( *this ); // this implements MEmailSearchObserver

   search->Cancel(); // cancel search

   CleanupStack::PopAndDestroy(); // search

   @endcode

 * @since S60 v5.0

 */

class MEmailMessageSearchAsync : public MEmailInterface

{

public:

    /**

    * Sets sort order for search results.

    * Leaves KErrNotReady if search is ongoing.

    */

    virtual void SetSortCriteriaL( const TEmailSortCriteria& aCriteria ) = 0;

    /**

    * Adds a search key. Leaves KErrNotReady if search is ongoing.

    */

    virtual void AddSearchKeyL( const TDesC& aSearchKey ) = 0;

    /**

    * Enables/disables search from remote email server.

    * Leaves KErrNotReady if search is ongoing.

    */

    virtual void SetRemoteSearchL( TBool aRemote ) = 0;                                                                  

    /**

    * Indicates whether remote search is enabled.

    */

    virtual TBool IsRemoteSearch() const = 0;

    /**

     * Starts search, all methods affecting search attribures leave

     * KErrNotReady while search is ongoing.

     * @param aObserver called when results are available.

     */     

    virtual void StartSearchL( MEmailSearchObserver& aObserver ) = 0;

    /**

     * Cancels search.

     */

    virtual void Cancel() = 0;

    /** returns search status 

      * @return search status:

      *     < 0 : Search has failed

      *     KRequestPending : search is ongoing. note that status may be

      *         KRequestPending after HandleResultL callback because results 

      *         may be given in chunks of results. Size of chunk depends on

      *         implementation and may vary.

      *     KErrNone : initial state, or search has finished

      */

    virtual TInt Status() const = 0;

    /**

     * Resets all search attribures. Cancels search if ongoing. 

     */

    virtual void Reset() = 0;

};

} //EmailInterface

#endif // __MEMAILACTIONS

// End of file.