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1   /*
2    * Copyright 2006-2008 the original author or authors.
3    * 
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
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
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.
15   */
16  
17  package org.springframework.osgi.service.importer;
18  
19  import org.osgi.framework.Filter;
20  
21  /**
22   * Dependency contract to an OSGi service.
23   * 
24   * @author Costin Leau
25   * @author Andy Piper
26   */
27  public interface OsgiServiceDependency {
28  
29  	/**
30  	 * Returns the OSGi filter for the service dependency.
31  	 * 
32  	 * @return filter describing the dependent OSGi service
33  	 */
34  	Filter getServiceFilter();
35  
36  	/**
37  	 * Returns the bean name (if any) that declares this dependency.
38  	 * 
39  	 * @return the name of bean declaring the dependency. Can be null.
40  	 */
41  	String getBeanName();
42  
43  	/**
44  	 * Indicates if the dependency is mandatory or not.
45  	 * 
46  	 * @return true if the dependency is mandatory, false otherwise.
47  	 */
48  	boolean isMandatory();
49  }