opimcache.h

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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 OPIMCACHE_H
#define OPIMCACHE_H

/* OPIE */
#include <opie2/opimrecord.h>

/* QT */
#include <qintcache.h>

namespace Opie {
class OPimCacheItemPrivate;

template <class T = OPimRecord>
class OPimCacheItem {
public:
    OPimCacheItem( const T& t = T() );
    OPimCacheItem( const OPimCacheItem& );
    ~OPimCacheItem();

    OPimCacheItem &operator=( const OPimCacheItem& );

    T record()const;
    void setRecord( const T& );
private:
    T m_t;
    OPimCacheItemPrivate *d;
};


class OPimCachePrivate;
template <class T = OPimRecord>
class OPimCache {
public:
    typedef OPimCacheItem<T> Item;
    OPimCache();
    OPimCache( const OPimCache& );
    ~OPimCache();

    OPimCache &operator=( const OPimCache& );

    bool contains(int uid)const;
    void invalidate();
    void setSize( int size );

    T find(int uid )const;
    void add( const T& );
    void remove( int uid );
    void replace( const T& );

private:
    QIntCache<Item> m_cache;
    OPimCachePrivate* d;
};

// Implementation
template <class T>
OPimCacheItem<T>::OPimCacheItem( const T& t )
    : m_t(t) {
}
template <class T>
OPimCacheItem<T>::~OPimCacheItem() {

}
template <class T>
T OPimCacheItem<T>::record()const {
    return m_t;
}
template <class T>
void OPimCacheItem<T>::setRecord( const T& t ) {
    m_t = t;
}
// Cache
template <class T>
OPimCache<T>::OPimCache()
    : m_cache(100, 53 )
{
    m_cache.setAutoDelete( TRUE );
}
template <class T>
OPimCache<T>::~OPimCache() {

}
template <class T>
bool OPimCache<T>::contains(int uid )const {
    Item* it = m_cache.find( uid, FALSE );
    if (!it)
        return false;
    return true;
}
template <class T>
void OPimCache<T>::invalidate() {
    m_cache.clear();
}
template <class T>
void OPimCache<T>::setSize( int size ) {
    m_cache.setMaxCost( size );
}
template <class T>
T OPimCache<T>::find(int uid )const {
    Item *it = m_cache.find( uid );
    if (it)
        return it->record();
    return T();
}
template <class T>
void OPimCache<T>::add( const T& t ) {
    Item* it = 0l;
    it = m_cache.find(t.uid(), FALSE );

    if (it )
        it->setRecord( t );

    it = new Item( t );
    if (!m_cache.insert( t.uid(), it ) )
        delete it;
}
template <class T>
void OPimCache<T>::remove( int uid ) {
    m_cache.remove( uid );
}
template <class T>
void OPimCache<T>::replace( const T& t) {
    Item *it = m_cache.find( t.uid() );
    if ( it ) {
        it->setRecord( t );
    }
}

}

#endif

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