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/*
This file is part of the Opie Project
Copyright (C) The Main Author <main-author@whereever.org>
=. Copyright (C) The Opie Team <opie-devel@handhelds.org>
.=l.
.>+-=
_;:, .> :=|. This program is free software; you can
.> <`_, > . <= redistribute it and/or modify it under
:`=1 )Y*s>-.-- : the terms of the GNU Library General Public
.="- .-=="i, .._ License as published by the Free Software
- . .-<_> .<> Foundation; either version 2 of the License,
._= =} : or (at your option) any later version.
.%`+i> _;_.
.i_,=:_. -<s. This program is distributed in the hope that
+ . -:. = it will be useful, but WITHOUT ANY WARRANTY;
: .. .:, . . . without even the implied warranty of
=_ + =;=|` MERCHANTABILITY or FITNESS FOR A
_.=:. : :=>`: PARTICULAR PURPOSE. See the GNU
..}^=.= = ; Library General Public License for more
++= -. .` .: details.
: = ...= . :.=-
-. .:....=;==+<; You should have received a copy of the GNU
-_. . . )=. = Library General Public License along with
-- :-=` this library; see the file COPYING.LIB.
If not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef OPIE_PIM_ACCESS_BACKEND
#define OPIE_PIM_ACCESS_BACKEND
#include <qarray.h>
#include <qdatetime.h>
#include <opie2/opimtemplatebase.h>
#include <opie2/opimrecord.h>
namespace Opie {
class OPimAccessBackendPrivate;
/**
* OPimAccessBackend is the base class
* for all private backends
* it operates on OPimRecord as the base class
* and it's responsible for fast manipulating
* the resource the implementation takes care
* of
*/
template <class T = OPimRecord>
class OPimAccessBackend {
public:
typedef OTemplateBase<T> Frontend;
/** The access hint from the frontend */
OPimAccessBackend(int access = 0);
virtual ~OPimAccessBackend();
/**
* load the resource
*/
virtual bool load() = 0;
/**
* reload the resource
*/
virtual bool reload() = 0;
/**
* save the resource and
* all it's changes
*/
virtual bool save() = 0;
/**
* return an array of
* all available uids
*/
virtual QArray<int> allRecords()const = 0;
/**
* return a List of records
* that match the regex
*/
virtual QArray<int> matchRegexp(const QRegExp &r) const = 0;
/**
* queryByExample for T with the given Settings
*
*/
virtual QArray<int> queryByExample( const T& t, int settings, const QDateTime& d = QDateTime() ) = 0;
/**
* find the OPimRecord with uid @param uid
* returns T and T.isEmpty() if nothing was found
*/
virtual T find(int uid )const = 0;
virtual T find(int uid, const QArray<int>& items,
uint current, typename Frontend::CacheDirection ) const;
/**
* clear the back end
*/
virtual void clear() = 0;
/**
* add T
*/
virtual bool add( const T& t ) = 0;
/**
* remove
*/
virtual bool remove( int uid ) = 0;
/**
* replace a record with T.uid()
*/
virtual bool replace( const T& t ) = 0;
/*
* setTheFrontEnd!!!
*/
void setFrontend( Frontend* front );
/**
* set the read ahead count
*/
void setReadAhead( uint count );
protected:
int access()const;
void cache( const T& t )const;
/**
* Returns the element with given uid out of the cache.
* Returns empty element if nothing was found.
* <b>Attention:</b> This just works if we have a frontend which contains the cache !
*/
T cacheFind( int uid ) const;
/**
* use a prime number here!
*/
void setSaneCacheSize( int );
uint readAhead()const;
private:
OPimAccessBackendPrivate *d;
Frontend* m_front;
uint m_read;
int m_acc;
};
template <class T>
OPimAccessBackend<T>::OPimAccessBackend(int acc)
: m_acc( acc )
{
m_front = 0l;
}
template <class T>
OPimAccessBackend<T>::~OPimAccessBackend() {
}
template <class T>
void OPimAccessBackend<T>::setFrontend( Frontend* fr ) {
m_front = fr;
}
template <class T>
void OPimAccessBackend<T>::cache( const T& t )const {
if ( m_front )
m_front->cache( t );
}
template <class T>
T OPimAccessBackend<T>::cacheFind( int uid )const {
if ( ! m_front ){
qWarning ( "No frontend assigned ! Therefore we cannot access the cache to return the right element!" );
return T();
}
return m_front->cacheFind( uid );
}
template <class T>
void OPimAccessBackend<T>::setSaneCacheSize( int size) {
if ( m_front )
m_front->setSaneCacheSize( size );
}
template <class T>
T OPimAccessBackend<T>::find( int uid, const QArray<int>&,
uint, typename Frontend::CacheDirection ) const{
qDebug( "*** Lookahead feature not supported. Fallback to default find!" );
return find( uid );
}
template <class T>
void OPimAccessBackend<T>::setReadAhead( uint count ) {
m_read = count;
}
template <class T>
uint OPimAccessBackend<T>::readAhead()const {
return m_read;
}
template <class T>
int OPimAccessBackend<T>::access()const {
return m_acc;
}
}
#endif
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