//  Real.java
//
//  Author:
//       Antonio J. Nebro <antonio@lcc.uma.es>
//       Juan J. Durillo <durillo@lcc.uma.es>
// 
//  Copyright (c) 2011 Antonio J. Nebro, Juan J. Durillo
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

package jmetal.encodings.variable;

import jmetal.core.Variable;
import jmetal.util.Configuration;
import jmetal.util.JMException;
import jmetal.util.PseudoRandom;


/**
 * This class implements a Real value decision encodings.variable
 */
public class Real extends Variable{

  /**
   * Stores the value of the real encodings.variable
   */
  private double value_;
  
  /**
   * Stores the lower bound of the real encodings.variable
   */
  private double lowerBound_;
  
  /**
   * Stores the upper bound of the real encodings.variable
   */
  private double upperBound_;
    
  /**
   * Constructor
   */
  public Real() {
  } // Real
    
  
  /**
   * Constructor
   * @param lowerBound Lower limit for the encodings.variable
   * @param upperBound Upper limit for the encodings.variable
   */
  public Real(double lowerBound, double upperBound){
    lowerBound_ = lowerBound;
    upperBound_ = upperBound;
    value_ = PseudoRandom.randDouble()*(upperBound-lowerBound)+lowerBound;        
  } //Real

  /**
   * Constructor
   * @param lowerBound Lower limit for the encodings.variable
   * @param upperBound Upper limit for the encodings.variable
   * @param value Value of the variable
   */
  public Real(double lowerBound, double upperBound, double value){
    lowerBound_ = lowerBound;
    upperBound_ = upperBound;
    value_ = value ;
  } //Real
  
  /** 
   * Copy constructor.
   * @param variable The encodings.variable to copy.
   * @throws JMException 
   */
  public Real(Variable variable) throws JMException{
    lowerBound_ = variable.getLowerBound();
    upperBound_ = variable.getUpperBound();
    value_ = variable.getValue();        
  } //Real

  /**
   * Gets the value of the <code>Real</code> encodings.variable.
   * @return the value.
   */
  public double getValue() {
    return value_;
  } // getValue
  
  /**
   * Sets the value of the encodings.variable.
   * @param value The value.
   */
  public void setValue(double value) {
    value_ = value;
  } // setValue
    
  /** 
   * Returns a exact copy of the <code>Real</code> encodings.variable
   * @return the copy
   */
  public Variable deepCopy(){
    try {
      return new Real(this);
    } catch (JMException e) {
      Configuration.logger_.severe("Real.deepCopy.execute: JMException");
      return null ;
    }
  } // deepCopy

  
  /**
   * Gets the lower bound of the encodings.variable.
   * @return the lower bound.
   */
  public double getLowerBound() {
    return lowerBound_;
  } //getLowerBound

  /**
   * Gets the upper bound of the encodings.variable.
   * @return the upper bound.
   */
  public double getUpperBound() {
    return upperBound_;
  } // getUpperBound
    
  
  /**
   * Sets the lower bound of the encodings.variable.
   * @param lowerBound The lower bound.
   */
  public void setLowerBound(double lowerBound)  {
    lowerBound_ = lowerBound;
  } // setLowerBound
    
  /**
   * Sets the upper bound of the encodings.variable.
   * @param upperBound The upper bound.
   */
  public void setUpperBound(double upperBound) {
    upperBound_ = upperBound;
  } // setUpperBound
  
  
  /**
   * Returns a string representing the object
   * @return the string
   */
  public String toString(){
    return value_+"";
  } //toString
} // Real
