RE: Dynamic data

I'm installing my location handlers into the application bean context by
overriding the AbstractLocationHandler.setLayer(LocationLayer layer) method:

// MyLocationHandler.java

public class MyLocationHandler extends AbstractLocationHandler implements
PropertyChangeListener, beanContextmembershipListener {
  private beanContext bc;
  public void setLayer(LocationLayer layer) {
    setBeanContext(layer.getbeanContext());
    layer.addPropertyChangeListener("beanContext", this);
  }
  private void setBeanContext(BeanContext newBC) {
    if (bc != null) {
      bc.removeBeanContextMembershipListener(this);
    }
    bc = newBC;
    if (bc != null) {
      bc.addBeanContextMembershipListener(this);
    }
  }
}

This way, if the layer has a context set, the handler gets it right away.
Otherwise, when the layer has its context set, this finds out:

  Objects that implement this interface, shall fire a
java.beans.PropertyChangeEvent, with
  parameters: propertyName "beanContext", oldValue (the previous nesting
BeanContext
  instance, or null), newValue (the current nesting BeanContext instance, or
null).
    -- JavaDoc, BeanContextChild interface.

Eric

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