Signumprovider.java

//    uniCenta oPOS  - Touch Friendly Point Of Sale
//    Copyright (c) 2009-2013 uniCenta
//    http://www.unicenta.net/unicentaopos
//
//    This file is part of uniCenta oPOS
//
//    uniCenta oPOS 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.
//
//   uniCenta oPOS 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 uniCenta oPOS.  If not, see <http://www.gnu.org/licenses/>.

package com.openbravo.pos.ticket;

import java.util.*;

public class Signumprovider {
    
    private Set m_positives = new HashSet();
    private Set m_negatives = new HashSet();
    
    /** Creates a new instance of Signumprovider */
    public Signumprovider() {
    }
    
    public void addPositive(Object key) {
        m_positives.add(key);
    }
    
    public void addNegative(Object key) {
        m_negatives.add(key);
    }
    
    public Double correctSignum(Object key, Double value) {
        if (m_positives.contains(key)) {
            return value.doubleValue() < 0.0 ? new Double(-value.doubleValue()) : value;
        } else if (m_negatives.contains(key)) {
            return value.doubleValue() > 0.0 ? new Double(-value.doubleValue()) : value;
        } else {
            return value;
        }        
    }    
}