package joptima.functions;

import joptima.Parameter;

/**
 * Constant function.
 * A concrete implementation of joptima.Function that returns a constant.
 */
public class Constant implements joptima.Function {

  public double m_constant;

  public Parameter[] getParameters() {
    Parameter[] parameters = null;
    try {
      parameters = new Parameter[]{new Parameter(this, "constant")};
    } catch (NoSuchFieldException nsfe) {
      nsfe.printStackTrace();
    }
    return parameters;
  }

  private String name = "Constant";
  public String getName() { return name; }
  public void setName(String newname) { name = newname; }

  /**
   * Default constructor: constant = 0;
   */
  public Constant() {
    m_constant = 0;
  }

  /**
   * Constructor.
   */
  public Constant(double constant) {
    this.m_constant = constant;
  }

  public double calculate(double x) {
    return m_constant;
  }

  public double getConstant() {
    return m_constant;
  }

  public void setConstant(double constant) {
    this.m_constant = constant;
  }
}