SpringCommandHandler.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   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.argeo.eclipse.spring;
  18
  19 import org.apache.commons.logging.Log;
  20 import org.apache.commons.logging.LogFactory;
  21 import org.eclipse.core.commands.ExecutionEvent;
  22 import org.eclipse.core.commands.ExecutionException;
  23 import org.eclipse.core.commands.IHandler;
  24 import org.eclipse.core.commands.IHandlerListener;
  25 import org.springframework.context.ApplicationContext;
  26
  27 public class SpringCommandHandler implements IHandler {
  28         private final static Log log = LogFactory
  29                         .getLog(SpringCommandHandler.class);
  30
  31         public void addHandlerListener(IHandlerListener handlerListener) {
  32         }
  33
  34         public void dispose() {
  35         }
  36
  37         public Object execute(ExecutionEvent event) throws ExecutionException {
  38                 String commandId = event.getCommand().getId();
  39                 String bundleSymbolicName = commandId.substring(0,
  40                                 commandId.lastIndexOf('.'));
  41                 try {
  42                         if (log.isTraceEnabled())
  43                                 log.trace("Execute " + event + " via spring command handler "
  44                                                 + this);
  45                         // TODO: make it more flexible and robust
  46                         ApplicationContext applicationContext = ApplicationContextTracker
  47                                         .getApplicationContext(bundleSymbolicName);
  48
  49                         // retrieve the command via its id
  50                         String beanName = event.getCommand().getId();
  51
  52                         if (!applicationContext.containsBean(beanName)) {
  53                                 if (beanName.startsWith(bundleSymbolicName))
  54                                         beanName = beanName
  55                                                         .substring(bundleSymbolicName.length() + 1);
  56                         }
  57
  58                         if (!applicationContext.containsBean(beanName))
  59                                 throw new ExecutionException("No bean found with name "
  60                                                 + beanName + " in bundle " + bundleSymbolicName);
  61                         Object bean = applicationContext.getBean(beanName);
  62
  63                         if (!(bean instanceof IHandler))
  64                                 throw new ExecutionException("Bean with name " + beanName
  65                                                 + " and class " + bean.getClass()
  66                                                 + " does not implement the IHandler interface.");
  67
  68                         IHandler handler = (IHandler) bean;
  69                         return handler.execute(event);
  70                 } catch (Exception e) {
  71                         // TODO: use eclipse error management
  72                         // log.error(e);
  73                         throw new ExecutionException("Cannot execute Spring command "
  74                                         + commandId + " in bundle " + bundleSymbolicName, e);
  75                 }
  76         }
  77
  78         public boolean isEnabled() {
  79                 return true;
  80         }
  81
  82         public boolean isHandled() {
  83                 return true;
  84         }
  85
  86         public void removeHandlerListener(IHandlerListener handlerListener) {
  87         }
  88
  89 }