001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.xbean.kernel; 018 019 import java.util.Collections; 020 import java.util.Set; 021 022 /** 023 * A basic service factory that always creates the supplied object. 024 * 025 * @author Dain Sundstrom 026 * @version $Id$ 027 * @since 2.0 028 */ 029 public class StaticServiceFactory extends AbstractServiceFactory { 030 private final Object service; 031 private final ClassLoader classLoader; 032 033 /** 034 * Creates a non-restartable service factory which will simply returns the specified service from the createService 035 * method. 036 * 037 * @param service the static to which this factory "creates" 038 * @throws NullPointerException if service is null 039 */ 040 public StaticServiceFactory(Object service) throws NullPointerException { 041 if (service == null) throw new NullPointerException("service is null"); 042 this.service = service; 043 ClassLoader cl = service.getClass().getClassLoader(); 044 if (cl == null) { 045 cl = ClassLoader.getSystemClassLoader(); 046 } 047 this.classLoader = cl; 048 } 049 050 /** 051 * Creates a non-restartable service factory which will simply returns the specified service from the createService 052 * method. 053 * 054 * @param service the static to which this factory "creates" 055 * @param classLoader the classLoader used to load the service class 056 * @throws NullPointerException if service or classLoader is null 057 */ 058 public StaticServiceFactory(Object service, ClassLoader classLoader) throws NullPointerException { 059 if (service == null) throw new NullPointerException("service is null"); 060 if (classLoader == null) throw new NullPointerException("classLoader is null"); 061 this.service = service; 062 this.classLoader = classLoader; 063 } 064 065 public Class[] getTypes() { 066 return new Class[]{service.getClass()}; 067 } 068 069 /** 070 * {@inheritDoc} 071 */ 072 public boolean isRestartable() { 073 return false; 074 } 075 076 /** 077 * {@inheritDoc} 078 */ 079 public Set getOwnedServices() { 080 return Collections.EMPTY_SET; 081 } 082 083 /** 084 * Returns the static service instance. 085 * 086 * @param serviceContext ignored 087 * @return the static service instance 088 */ 089 public Object createService(ServiceContext serviceContext) { 090 return service; 091 } 092 093 /** 094 * This method is a noop. 095 * 096 * @param serviceContext ignored 097 */ 098 public void destroyService(ServiceContext serviceContext) { 099 } 100 101 /** 102 * {@inheritDoc} 103 */ 104 public ClassLoader getClassLoader() { 105 return classLoader; 106 } 107 108 }