/* * Copyright 2005-2010 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.wamblee.system.core; /** * * @author $author$ * @version $Revision: 1.6 $ */ public interface RequiredInterface extends NamedInterface { /** * * @return True iff the required interface is optional. */ boolean isOptional(); /** * Checks if the service is provided by a given provided interface. * * @param aInterface * Provided interface. * * @return */ boolean implementedBy(ProvidedInterface aInterface); /** * Sets the provider of this interface. * * @param aProvider * Provider. */ void setProvider(ProvidedInterface aProvider); /** * Gets the provider interface. * * @return Provider or null if not set. */ ProvidedInterface getProvider(); /** * Determines if the requirements of the current interface are at least * those of the given required interface. * * */ boolean covers(RequiredInterface aInterface); }