eclipse/runtime/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/spring/SpringCommandHandler.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   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 package org.argeo.eclipse.spring;
  17
  18 import org.apache.commons.logging.Log;
  19 import org.apache.commons.logging.LogFactory;
  20 import org.argeo.ArgeoException;
  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                         if (applicationContext == null)
  49                                 throw new ArgeoException("No application context found for "
  50                                                 + bundleSymbolicName);
  51
  52                         // retrieve the command via its id
  53                         String beanName = event.getCommand().getId();
  54
  55                         if (!applicationContext.containsBean(beanName)) {
  56                                 if (beanName.startsWith(bundleSymbolicName))
  57                                         beanName = beanName
  58                                                         .substring(bundleSymbolicName.length() + 1);
  59                         }
  60
  61                         if (!applicationContext.containsBean(beanName))
  62                                 throw new ExecutionException("No bean found with name "
  63                                                 + beanName + " in bundle " + bundleSymbolicName);
  64                         Object bean = applicationContext.getBean(beanName);
  65
  66                         if (!(bean instanceof IHandler))
  67                                 throw new ExecutionException("Bean with name " + beanName
  68                                                 + " and class " + bean.getClass()
  69                                                 + " does not implement the IHandler interface.");
  70
  71                         IHandler handler = (IHandler) bean;
  72                         return handler.execute(event);
  73                 } catch (Exception e) {
  74                         // TODO: use eclipse error management
  75                         // log.error(e);
  76                         throw new ExecutionException("Cannot execute Spring command "
  77                                         + commandId + " in bundle " + bundleSymbolicName, e);
  78                 }
  79         }
  80
  81         public boolean isEnabled() {
  82                 return true;
  83         }
  84
  85         public boolean isHandled() {
  86                 return true;
  87         }
  88
  89         public void removeHandlerListener(IHandlerListener handlerListener) {
  90         }
  91
  92 }