/** A class to represent a Dog.
 * @see http:www.radford.edu/itec120/2007spring/Homeworks/hw03.html
 * @author Ian Barland
 * @version 2007.Feb.20.
 */

class Dog {
  /** This dog's age, in whole years. */
  private int age;
  /** The sound this dog makes (written as a String -- not an audio object). */
  private String sound;

  /* A Named constant. Really, should be a static field (and, public final). */
  private int DOG_YEARS_PER_YEAR = 7;


  /** Constructor.
   */
  public Dog() {
    this.age = 0;
    this.sound = "woof";
    }

  /** age getter.
   * @return this Dog's age to (in whole years).
   */
  public int getAge() { return this.age; }

  /** age setter.
   * @param revisedAge The amount to set this Dog's age to (in whole years).
   *  If a negative number is passed in, 0 is used instead.
   */
  public void setAge( int revisedAge ) { 
    if (revisedAge >= 0) {
      this.age = revisedAge;
      }
    else {
      /* Optional: print an message to the system error log. */
      System.err.println( "setAge: Tried to set this dog's age to "
                          + revisedAge + "; used 0 instead." );
      this.age = 0;
      }
    }

  /** sound getter.
   * @return this Dog's sound (written as a String -- not an audio object).
   */
  public String getSound() { return this.sound; }

  /** sound setter.
   * @param revisedSound The text to set this Dog's sound to (written as a String).
   */
  public void setSound( String revisedSound ) { this.sound = revisedSound; }
 
  
  
  /** Speak, doggy -- speak!
   * @return The sound made when this dog is told to speak (written as text).
   */
  public String speak() {
    return this.getSound() + ", " + this.getSound() + ".";
    }
  
  /** Return the age of this dog, in (whole) dog years.
   * @return Return the age of this dog, in (whole) dog years.
   */
  public int getAgeInDogYears() {
    return this.getAge() * DOG_YEARS_PER_YEAR;
    }
    
    
  /** return a string describing this Dog.
   * @return a String describing this Dog.
   */
  public String toString() {
    return "[Dog: " 
         + "age: " + this.getAge()
         + "sound: \"" + this.getSound() + "\""
         + "]";
     }
    
  /** Age the dog one year (in human years).
   */
  public void ageOneYear() {
    this.setAge( this.getAge() + 1 );
    }
    
  
  }