2 * Copyright 2007 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.system.core;
22 * @version $Revision: 1.6 $
24 public interface RequiredInterface extends NamedInterface {
28 * @return True iff the required interface is optional.
33 * Checks if the service is provided by a given provided interface.
35 * @param aInterface Provided interface.
39 boolean implementedBy(ProvidedInterface aInterface);
42 * Sets the provider of this interface.
44 * @param aProvider Provider.
46 void setProvider(ProvidedInterface aProvider);
49 * Gets the provider interface.
51 * @return Provider or null if not set.
53 ProvidedInterface getProvider();
56 * Determines if the requirements of the current interface are at
57 * least those of the given required interface.
59 * @param aInterface DOCUMENT ME!
61 * @return DOCUMENT ME!
63 boolean covers(RequiredInterface aInterface);