/*
 * 
 * Protected version of divide for double. 
 *
 */
import org.jgap.*;
import org.jgap.gp.*;
import org.jgap.gp.impl.*;
import org.jgap.gp.function.*;
import org.jgap.util.*;

/**
 * The protected divide operation.
 *
 * @author Hakan Kjellerstrand
 */
public class DivideProtected
    extends MathCommand implements IMutateable, ICloneable {

  public DivideProtected(final GPConfiguration a_conf, Class a_returnType)
      throws InvalidConfigurationException {
    super(a_conf, 2, a_returnType);
  }

  public CommandGene applyMutation(int index, double a_percentage)
      throws InvalidConfigurationException {
    Multiply mutant = new Multiply(getGPConfiguration(), getReturnType());
    return mutant;
  }

  /**
   * Clones the object. Simple and straight forward implementation here.
   *
   * @return cloned instance of this object
   *
   * @author Klaus Meffert
   * @since 3.4
   */
  public Object clone() {
    try {
      DivideProtected result = new DivideProtected(getGPConfiguration(), getReturnType());
      return result;
    } catch (Exception ex) {
      throw new CloneException(ex);
    }
  }

  public String toString() {
    return "&1 / &2";
  }

  /**
   * @return textual name of this command
   *
   * @author Klaus Meffert
   * @since 3.2
   */
  public String getName() {
    return "DivideProtected";
  }

  public int execute_int(ProgramChromosome c, int n, Object[] args) {
    return c.execute_int(n, 0, args) / c.execute_int(n, 1, args);
  }

  public long execute_long(ProgramChromosome c, int n, Object[] args) {
    return c.execute_long(n, 0, args) / c.execute_long(n, 1, args);
  }

  public float execute_float(ProgramChromosome c, int n, Object[] args) {
    return c.execute_float(n, 0, args) / c.execute_float(n, 1, args);
  }

  public double execute_double(ProgramChromosome c, int n, Object[] args) {
      double d1 = c.execute_double(n, 0, args);
      double d2 = c.execute_double(n, 1, args);
      if (d2 == 0) {
          return 1;
      } else {
          return d1 / d2;
      }
  }

  public Object execute_object(ProgramChromosome c, int n, Object[] args) {
    return ( (Compatible) c.execute_object(n, 0, args)).execute_divide_protected(c.
        execute_object(n, 1, args));
  }

  protected interface Compatible {
    public Object execute_divide_protected(Object o);
  }
}