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;
18 public interface RequiredInterface extends NamedInterface {
21 * @return True iff the required interface is optional.
27 * Checks if the service is provided by a given provided interface.
28 * @param aInterface Provided interface.
31 boolean implementedBy(ProvidedInterface aInterface);
34 * Sets the provider of this interface.
35 * @param aProvider Provider.
37 void setProvider(ProvidedInterface aProvider);
40 * Gets the provider interface.
41 * @return Provider or null if not set.
43 ProvidedInterface getProvider();
46 * Determines if the requirements of the current interface are at least those
47 * of the given required interface.
49 boolean covers(RequiredInterface aInterface);