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Reco4j is an open source project aims at developing a recommendation framework based on graph data sources. We choose graph databases for several reasons. They are NoSQL databases, so "schemaless". This means that it is possible to extend the basic data structure with intermediate information, i.e. similarity value between item and so on. Moreover, since every information is expressed with properties, nodes and relations, the recommendation process can be customized to work on every graph. Reco4j can be used on every graph where "user" and "item" is represented by node and the preferences are modelled as relationship between them. Current implementation leverage on Neo4j as first graph database integrated in our framework.

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/*
 * Rating.java
 * 
 * Copyright (C) 2013 Alessandro Negro 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.reco4j.model;

import java.sql.Timestamp;
import org.apache.mahout.cf.taste.model.Preference;
import org.reco4j.graph.INode;

/**
 *
 * @author Alessandro Negro 
 */
public class Rating implements Preference
{
  protected INode item = null;
  protected INode user = null;  
  protected double rate;  
  protected Timestamp ratingDate = null;

  public Rating(INode item, double rate)
  {
    this(null, item, rate, null);
  }
  public Rating(INode user, INode item, double rate, Timestamp ratingDate)
  {
    this.user = user;
    this.item = item;
    this.rate = rate;
    this.ratingDate = ratingDate;
  }
  

  public INode getItem()
  {
    return item;
  }

  public void setItem(INode item)
  {
    this.item = item;
  }

  public INode getUser()
  {
    return user;
  }

  public void setUser(INode user)
  {
    this.user = user;
  }

  public double getRate()
  {
    return rate;
  }

  public void setRate(double rate)
  {
    this.rate = rate;
  }

  public Timestamp getRatingDate()
  {
    return ratingDate;
  }

  public void setRatingDate(Timestamp ratingDate)
  {
    this.ratingDate = ratingDate;
  }

  @Override
  public long getUserID()
  {
    return user.getId();
  }

  @Override
  public long getItemID()
  {
    return item.getId();
  }

  @Override
  public float getValue()
  {
    return (float)rate;
  }

  @Override
  public void setValue(float value)
  {
    rate = (double)value;
  }
}