Designing Class Libraries for Visual Builders

by Arthur T. Jolin, David Lavin, and Susan Carpenter





Example 1:



(a)

class IAddress : public IStandardNotifier {

  public:

    virtual IString

      street () const;

    virtual IAddress

     &setStreet (const IString& aStreet);

    static INotificationId const

      streetId;

  private:

    IString iStreet;

} ;



(b)

const INotificationId IAddress::streetId = "IAddress::street";

IString IAddress::street () const {

  return iStreet;

}

IAddress& IAddress::setStreet (const IString& aStreet) {

  if (iStreet != aStreet) {

    iStreet = aStreet;

    IString eventData(iStreet);

    notifyObservers(INotificationEvent(streetId, *this, true, (void*)&eventData));

  } /* endif */

  return *this;

}





Example 2: 

public class Address implements java.lang.Cloneable {

String fieldStreet = "";

protected transient java.beans.PropertyChangeSupport propertyChange = new java.beans.PropertyChangeSupport(this);

String fieldState = "";

String fieldCity = "";

String fieldZipCode = "";

 ...

/* Sets the street property (java.lang.String) value.

 * @param street The new value for the property.

 * @see #getStreet

 */

public void setStreet(String street) {

 /* Get the old property value for fire property change event. */

 String oldValue = fieldStreet;

 /* Set the street property (attribute) to the new value. */

 fieldStreet = street;

 /* Fire (signal/notify) the street property change event. */

 firePropertyChange("street", oldValue, street);

 return;

}

 ...

}











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