Simple PageableDatamodel impl

package org.luca.jsf.model.rf;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.faces.bean.ManagedBean;

import org.luca.domain.Item;


@ManagedBean
public class ItemModel extends PageableDatamodel<Item>
{

    private static Map<Integer, Item> data;
    static
    {
        data = new HashMap<Integer, Item>();
        for ( Integer i = 0; i < 100; i++ )
        {
            Item mov = new Item( i, "item nr: " + i );
            data.put( i, mov );
        }
    }


    @Override
    protected Item getItemById( Integer id )
    {
        return data.get( id );
    }


    @Override
    protected List<Item> getItemsRanged( int start, int numberOfRows )
    {
        Collection<Item> set = data.values();
        List<Item> list = new ArrayList<Item>( set );
        Collections.sort( list, new Comparator<Item>()
        {
            @Override
            public int compare( Item o1, Item o2 )
            {
                return o1.getId().compareTo( o2.getId() );
            }
        } );
        return list.subList( start, start + numberOfRows );
    }


    @Override
    protected int getItemsTotalCount()
    {
        return data.size();
    }

}