| /* |
| * 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.servicemix.kernel.gshell.core; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.geronimo.gshell.command.CommandAction; |
| import org.apache.geronimo.gshell.command.CommandContext; |
| import org.apache.geronimo.gshell.command.Variables; |
| import org.apache.geronimo.gshell.io.IO; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| import org.springframework.osgi.context.BundleContextAware; |
| |
| public abstract class OsgiCommandSupport implements CommandAction, BundleContextAware { |
| |
| protected Log log = LogFactory.getLog(getClass()); |
| protected BundleContext bundleContext; |
| protected CommandContext commandContext; |
| protected IO io; |
| protected Variables variables; |
| protected List<ServiceReference> usedReferences; |
| |
| public Object execute(CommandContext commandContext) throws Exception { |
| this.commandContext = commandContext; |
| this.io = commandContext.getIo(); |
| this.variables = commandContext.getVariables(); |
| try { |
| return doExecute(); |
| } finally { |
| ungetServices(); |
| } |
| } |
| |
| protected abstract Object doExecute() throws Exception; |
| |
| public BundleContext getBundleContext() { |
| return bundleContext; |
| } |
| |
| public void setBundleContext(BundleContext bundleContext) { |
| this.bundleContext = bundleContext; |
| } |
| |
| protected <T> List<T> getAllServices(Class<T> clazz, String filter) throws Exception { |
| ServiceReference[] references = getBundleContext().getAllServiceReferences(clazz.getName(), filter); |
| if (references == null) { |
| return null; |
| } |
| List<T> services = new ArrayList<T>(); |
| for (ServiceReference ref : references) { |
| T t = getService(clazz, ref); |
| services.add(t); |
| } |
| return services; |
| } |
| |
| protected <T> T getService(Class<T> clazz, ServiceReference reference) { |
| T t = (T) getBundleContext().getService(reference); |
| if (t != null) { |
| if (usedReferences == null) { |
| usedReferences = new ArrayList<ServiceReference>(); |
| } |
| usedReferences.add(reference); |
| } |
| return t; |
| } |
| |
| protected void ungetServices() { |
| if (usedReferences != null) { |
| for (ServiceReference ref : usedReferences) { |
| getBundleContext().ungetService(ref); |
| } |
| } |
| } |
| |
| } |