runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/AbstractServiceController.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.slc.web.mvc;
  18
  19 import java.io.PrintWriter;
  20 import java.io.StringWriter;
  21
  22 import javax.servlet.http.HttpServletRequest;
  23 import javax.servlet.http.HttpServletResponse;
  24
  25 import org.argeo.slc.msg.ExecutionAnswer;
  26 import org.springframework.web.servlet.ModelAndView;
  27 import org.springframework.web.servlet.mvc.AbstractController;
  28
  29 public abstract class AbstractServiceController extends AbstractController {
  30         public final static String KEY_ANSWER = "__answer";
  31
  32         private String viewName = null;
  33
  34         @Override
  35         protected final ModelAndView handleRequestInternal(
  36                         HttpServletRequest request, HttpServletResponse response)
  37                         throws Exception {
  38                 ModelAndView mv = new ModelAndView();
  39                 mv.setViewName(getViewName());
  40                 try {
  41                         handleServiceRequest(request, response, mv);
  42                 } catch (Exception e) {
  43                         e.printStackTrace();
  44                         StringWriter writer = new StringWriter();
  45                         e.printStackTrace(new PrintWriter(writer));
  46                         ExecutionAnswer answer = ExecutionAnswer.error(writer.toString());
  47                         ModelAndView errorMv = new ModelAndView();
  48                         errorMv.addObject(KEY_ANSWER, answer);
  49                         errorMv.setViewName(KEY_ANSWER);
  50                         return errorMv;
  51                 }
  52
  53                 if (mv.getModel().size() == 0) {
  54                         mv.addObject(KEY_ANSWER, ExecutionAnswer
  55                                         .ok("Execution completed properly"));
  56                 }
  57
  58                 if (mv.getViewName() == null && mv.getModel().size() == 1)
  59                         mv.setViewName(mv.getModel().keySet().iterator().next().toString());
  60
  61                 return mv;
  62         }
  63
  64         protected abstract void handleServiceRequest(HttpServletRequest request,
  65                         HttpServletResponse response, ModelAndView modelAndView)
  66                         throws Exception;
  67
  68         public void setViewName(String viewName) {
  69                 this.viewName = viewName;
  70         }
  71
  72         public String getViewName() {
  73                 return viewName;
  74         }
  75
  76 }