| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.felix.eventadmin.impl.security; |
| |
| import org.osgi.service.event.TopicPermission; |
| |
| /** |
| * Utility class for permissions. |
| * |
| * @see org.apache.felix.eventadmin.impl.security.TopicPermissions |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public abstract class PermissionsUtil |
| { |
| /** |
| * Creates a <tt>TopicPermission</tt> for the given topic and the type PUBLISH |
| * Note that a |
| * <tt>java.lang.Object</tt> is returned in case creating a new TopicPermission |
| * fails. This assumes that Bundle.hasPermission is used in order to evaluate the |
| * created Permission which in turn will return true if security is not supported |
| * by the framework. Otherwise, it will return false due to receiving something |
| * that is not a subclass of <tt>java.lang.SecurityPermission</tt> hence, this |
| * combination ensures that access is granted in case a topic permission could |
| * not be created due to missing security support by the framework. |
| * |
| * @param topic The target topic |
| * |
| * @return The created permission or a <tt>java.lang.Object</tt> in case the |
| * permission could not be created. |
| * |
| * @see org.apache.felix.eventadmin.impl.security.TopicPermissions#createTopicPermission(String) |
| * @see org.osgi.service.event.TopicPermission |
| */ |
| public static Object createPublishPermission(final String topic) |
| { |
| Object result; |
| try |
| { |
| result = new org.osgi.service.event.TopicPermission(topic, TopicPermission.PUBLISH); |
| } catch (Throwable t) |
| { |
| // This might happen in case security is not supported |
| // Bundle.hasPermission will return true in this case |
| // hence topicPermission = new Object() is o.k. |
| |
| result = new Object(); |
| } |
| return result; |
| } |
| |
| /** |
| * Creates a <tt>TopicPermission</tt> for the given topic and the type SUBSCRIBE |
| * Note that a |
| * <tt>java.lang.Object</tt> is returned in case creating a new TopicPermission |
| * fails. This assumes that Bundle.hasPermission is used in order to evaluate the |
| * created Permission which in turn will return true if security is not supported |
| * by the framework. Otherwise, it will return false due to receiving something |
| * that is not a subclass of <tt>java.lang.SecurityPermission</tt> hence, this |
| * combination ensures that access is granted in case a topic permission could |
| * not be created due to missing security support by the framework. |
| * |
| * @param topic The target topic |
| * |
| * @return The created permission or a <tt>java.lang.Object</tt> in case the |
| * permission could not be created. |
| * |
| * @see org.apache.felix.eventadmin.impl.security.TopicPermissions#createTopicPermission(String) |
| * @see org.osgi.service.event.TopicPermission |
| */ |
| public static Object createSubscribePermission(final String topic) |
| { |
| Object result; |
| try |
| { |
| result = new org.osgi.service.event.TopicPermission(topic, TopicPermission.SUBSCRIBE); |
| } catch (Throwable t) |
| { |
| // This might happen in case security is not supported |
| // Bundle.hasPermission will return true in this case |
| // hence topicPermission = new Object() is o.k. |
| |
| result = new Object(); |
| } |
| return result; |
| } |
| |
| } |