/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you 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 .
 */

#ifndef INCLUDED_UCBHELPER_RESULTSETHELPER_HXX
#define INCLUDED_UCBHELPER_RESULTSETHELPER_HXX

#include <memory>
#include <mutex>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/ucb/XDynamicResultSet.hpp>
#include <com/sun/star/ucb/OpenCommandArgument2.hpp>
#include <comphelper/interfacecontainer4.hxx>
#include <cppuhelper/implbase.hxx>
#include <ucbhelper/ucbhelperdllapi.h>

namespace com::sun::star::uno { class XComponentContext; }

namespace cppu {
    class OInterfaceContainerHelper;
}

namespace ucbhelper {


inline constexpr OUStringLiteral DYNAMICRESULTSET_SERVICE_NAME = u"com.sun.star.ucb.DynamicResultSet";


/**
  * This is an abstract base class for implementations of the service
  * com.sun.star.ucb.DynamicResultSet, which is the result of the command
  * "open" executed at a UCB folder content.
  *
  * Features of the base class implementation:
  * - standard interfaces ( XInterface, XTypeProvider, XServiceInfo )
  * - all required interfaces for service css::ucb::DynamicResultSet
  */
class UCBHELPER_DLLPUBLIC ResultSetImplHelper :
                public cppu::WeakImplHelper<
                    css::lang::XServiceInfo,
                    css::ucb::XDynamicResultSet>
{
    std::unique_ptr<comphelper::OInterfaceContainerHelper4<css::lang::XEventListener>> m_pDisposeEventListeners;
    bool                         m_bStatic;
    bool                         m_bInitDone;

protected:
    std::mutex                                                 m_aMutex;
    css::ucb::OpenCommandArgument2                             m_aCommand;
    css::uno::Reference< css::uno::XComponentContext >         m_xContext;
    // Resultset #1
    css::uno::Reference< css::sdbc::XResultSet >               m_xResultSet1;
    // Resultset #2
    css::uno::Reference< css::sdbc::XResultSet >               m_xResultSet2;
    // Resultset changes listener.
    css::uno::Reference< css::ucb::XDynamicResultSetListener > m_xListener;

private:
    UCBHELPER_DLLPRIVATE void init( bool bStatic );

    /**
      * Your implementation of this method has to fill the protected member
      * m_xResultSet1. This resultset must implement a complete static
      * resultset ( service com.sun.star.ucb.ContentResultSet ). This method
      * will be called at most once in the life of your implementation object.
      * After this method was called, the type of this resultset will be
      * "static". There is no way to change the type afterwards.
      * If this method gets called the client wants to use your resultset
      * exclusively statically. You may deploy this factum to optimize your
      * implementation (i.e. "switch off" all changes detection code in
      * your implementation).
      * Note that you may use the class ucb::ResultSet to implement the
      * static resultset, that is required here.
      */
    UCBHELPER_DLLPRIVATE virtual void initStatic() = 0;

    /**
      * Your implementation of this method has to fill the protected members
      * m_xResultSet1 and m_xResultSet2 of this base class. Each of these
      * resultsets must implement a complete static resultset
      * ( service com.sun.star.ucb.ContentResultSet ). This method will be
      * called at most once in the life of your implementation object.
      * After this method was called, the type of this resultset will be
      * "dynamic". There is no way to change the type afterwards.
      * If this method gets called the client wants to use your resultset
      * exclusively dynamically. This means, it is interested in getting
      * notifications on changes of data of the resultset contents. ( These
      * changes are to propagate by your implementation throw the member
      * m_xListener of this base class ).
      * If your implementation cannot detect changes of relevant data, you
      * may fill m_xResultSet1 and m_xResultSet2 with the same static resultset
      * implementation object. This normally will be the same instance you put
      * into m_xResultSet1 when initStatic() is called.
      */
    UCBHELPER_DLLPRIVATE virtual void initDynamic() = 0;

public:
    /**
      * Constructor.
      *
      * @param rxContext is a Service Manager.
      * @param rCommand is the parameter for the open command that produces
      *        this resultset.
      */
    ResultSetImplHelper(
            const css::uno::Reference<
                css::uno::XComponentContext >& rxContext,
            const css::ucb::OpenCommandArgument2& rCommand );

    /**
      * Destructor.
      */
    virtual ~ResultSetImplHelper() override;

    // XServiceInfo
    virtual OUString SAL_CALL getImplementationName() override;
    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;

    // XComponent ( base class of XDynamicResultSet )
    virtual void SAL_CALL
    dispose() override;
    virtual void SAL_CALL
    addEventListener( const css::uno::Reference< css::lang::XEventListener >& Listener ) override;
    virtual void SAL_CALL
    removeEventListener( const css::uno::Reference< css::lang::XEventListener >& Listener ) override;

    // XDynamicResultSet
    virtual css::uno::Reference< css::sdbc::XResultSet > SAL_CALL
    getStaticResultSet() override;
    virtual void SAL_CALL
    setListener( const css::uno::Reference< css::ucb::XDynamicResultSetListener >& Listener ) override;
    virtual void SAL_CALL
    connectToCache( const css::uno::Reference< css::ucb::XDynamicResultSet > & xCache ) override;

    /**
      * The implementation of this method always returns 0. Override this
      * method, if necessary.
      */
    virtual sal_Int16 SAL_CALL
    getCapabilities() override;

};

}

#endif /* ! INCLUDED_UCBHELPER_RESULTSETHELPER_HXX */

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