eclipse/runtime/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/spring/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.argeo.ArgeoException;
  22 import org.eclipse.core.commands.ExecutionEvent;
  23 import org.eclipse.core.commands.ExecutionException;
  24 import org.eclipse.core.commands.IHandler;
  25 import org.eclipse.core.commands.IHandlerListener;
  26 import org.springframework.context.ApplicationContext;
  27
  28 public class SpringCommandHandler implements IHandler {
  29         private final static Log log = LogFactory
  30                         .getLog(SpringCommandHandler.class);
  31
  32         public void addHandlerListener(IHandlerListener handlerListener) {
  33         }
  34
  35         public void dispose() {
  36         }
  37
  38         public Object execute(ExecutionEvent event) throws ExecutionException {
  39                 String commandId = event.getCommand().getId();
  40                 String bundleSymbolicName = commandId.substring(0,
  41                                 commandId.lastIndexOf('.'));
  42                 try {
  43                         if (log.isTraceEnabled())
  44                                 log.trace("Execute " + event + " via spring command handler "
  45                                                 + this);
  46                         // TODO: make it more flexible and robust
  47                         ApplicationContext applicationContext = ApplicationContextTracker
  48                                         .getApplicationContext(bundleSymbolicName);
  49                         if (applicationContext == null)
  50                                 throw new ArgeoException("No application context found for "
  51                                                 + bundleSymbolicName);
  52
  53                         // retrieve the command via its id
  54                         String beanName = event.getCommand().getId();
  55
  56                         if (!applicationContext.containsBean(beanName)) {
  57                                 if (beanName.startsWith(bundleSymbolicName))
  58                                         beanName = beanName
  59                                                         .substring(bundleSymbolicName.length() + 1);
  60                         }
  61
  62                         if (!applicationContext.containsBean(beanName))
  63                                 throw new ExecutionException("No bean found with name "
  64                                                 + beanName + " in bundle " + bundleSymbolicName);
  65                         Object bean = applicationContext.getBean(beanName);
  66
  67                         if (!(bean instanceof IHandler))
  68                                 throw new ExecutionException("Bean with name " + beanName
  69                                                 + " and class " + bean.getClass()
  70                                                 + " does not implement the IHandler interface.");
  71
  72                         IHandler handler = (IHandler) bean;
  73                         return handler.execute(event);
  74                 } catch (Exception e) {
  75                         // TODO: use eclipse error management
  76                         // log.error(e);
  77                         throw new ExecutionException("Cannot execute Spring command "
  78                                         + commandId + " in bundle " + bundleSymbolicName, e);
  79                 }
  80         }
  81
  82         public boolean isEnabled() {
  83                 return true;
  84         }
  85
  86         public boolean isHandled() {
  87                 return true;
  88         }
  89
  90         public void removeHandlerListener(IHandlerListener handlerListener) {
  91         }
  92
  93 }