IndexedIterable.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _STORAGE_INDEXEDITERABLE_H
#define _STORAGE_INDEXEDITERABLE_H

#include <storage/GenericIterable.h>

#include <support/Vector.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace storage {
#endif

// ==========================================================================
// ==========================================================================


class BIndexedIterable : public BGenericIterable
{
public:
    // --------------------------------------------------------------
                                    BIndexedIterable();
                                    BIndexedIterable(const SContext& context);

    // ---------------------------------------------------------------------


    class IndexedIterator;

    virtual sptr<GenericIterator>   NewGenericIterator(const SValue& args);


    // ---------------------------------------------------------------------



    virtual status_t                EntryAtLocked(  const sptr<IndexedIterator>& it, size_t index,
                                                    uint32_t flags, SValue* key, SValue* entry) = 0;

    virtual status_t                RemoveEntryAtLocked(size_t index);
    virtual size_t                  CountEntriesLocked() const = 0;

    virtual void                    CreateSelectionLocked(SValue* inoutSelection, SValue* outCookie) const;

    virtual void                    CreateSortOrderLocked(SValue* inoutSortBy, SVector<ssize_t>* outOrder) const;


            void                    UpdateIteratorIndicesLocked(size_t index, ssize_t delta);


protected:
    virtual                         ~BIndexedIterable();

private:
                                    BIndexedIterable(const BIndexedIterable& copyFrom);
                                    BIndexedIterable& operator=(const BIndexedIterable& copyFrom);

    static  bool                    update_indices_func(    const sptr<BGenericIterable>& iterable,
                                                            const sptr<GenericIterator>& iterator,
                                                            void* cookie);
};

// --------------------------------------------------------------------------


class BIndexedIterable::IndexedIterator : public BGenericIterable::GenericIterator
{
public:
    // --------------------------------------------------------------
                                IndexedIterator(const SContext& context, const sptr<BGenericIterable>& owner);

protected:
    virtual                     ~IndexedIterator();
public:

    virtual SValue              Inspect(const sptr<IBinder>& caller, const SValue& which, uint32_t flags);


    // ---------------------------------------------------------------------



    virtual SValue              Options() const;

    virtual size_t              Count() const;
    virtual size_t              Position() const;
    virtual void                SetPosition(size_t p);


    // ---------------------------------------------------------------------



    virtual status_t            ParseArgs(const SValue& args);

    virtual status_t            NextLocked(uint32_t flags, SValue* key, SValue* entry);
    virtual status_t            RemoveLocked();


    // ---------------------------------------------------------------------



    inline  const SValue&       SelectArgsLocked() const { return m_selectArgs; }


            ssize_t             CurrentIndexLocked() const;

            ssize_t             MoveIndexLocked();

private:
            friend class BIndexedIterable;

            void                update_indices_l(size_t index, ssize_t delta);

            size_t              m_count;
            SValue              m_selectArgs;
            SValue              m_selectCookie;
            SValue              m_orderArgs;
            SVector<ssize_t>    m_order;
            size_t              m_position;
};

// ==========================================================================
// ==========================================================================

#if _SUPPORTS_NAMESPACE
} } // namespace palmos::storage
#endif

#endif // _STORAGE_INDEXEDITERABLE_H

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