package oracle.toplink.example.conversion;
/**
 * An example tri-state custom type wrapping a Boolean. Pre-defined static 
 * instances are provided to eliminate duplicate values.
 */
public class Answer  {
  // Singleton instances provided to eliminate multiple copies
  public static Answer TRUE = new Answer(Boolean.TRUE);
  public static Answer FALSE = new Answer(Boolean.FALSE);
  public static Answer UNKNOWN = new Answer(null);
  // Values provided in one place for MyConversionManager to use
  public static String TRUE_VALUE = "Y";
  public static String FALSE_VALUE = "N";

  private Boolean value;
  
  private Answer(Boolean value) {}
  public Boolean getValue() {
    return this.value;
  }
  public boolean isUnknown() {
    return getValue() == null;
  }
  public boolean isTrue() {
    return getValue() == Boolean.TRUE;
  }
  public boolean isFalse() {
    return getValue() == Boolean.FALSE;
  }
  public String toString() {
    String strVal = "UNKNOWN";
    if (isTrue()) {
      strVal = "TRUE";
    }
    if (isFalse()) {
      strVal = "FALSE";
    }
    return "Answer(" + strVal + ")";
  }
}