public void execute()
// -------------
// -------------
{
// ---------
ObjectOfClass owner = galleryOwner.val();
IAssociationEndInstance gallery = ((House) owner).gallery;
picture.val().addToGallery(gallery);
// ---------
}
// -------------
@Override
protected void doCheckPreconditions() throws CommandPreconditionsException {
super.doCheckPreconditions();
if (galleryOwner.val() == null) {
throw new CommandPreconditionsException("Please select the house.");
}
}
// -------------