/**
* Execute the ALTER CLASS.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (attribute == null)
throw new OCommandExecutionException("Can't execute the command because it hasn't been parsed yet");
final OClassImpl cls = (OClassImpl) database.getMetadata().getSchema().getClass(className);
if (cls == null)
throw new OCommandExecutionException("Source class '" + className + "' not found");
cls.setInternal(attribute, value);
return null;
}