legacy/runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/AbstractServiceController.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.slc.web.mvc;
  17
  18 import java.io.PrintWriter;
  19 import java.io.StringWriter;
  20
  21 import javax.servlet.http.HttpServletRequest;
  22 import javax.servlet.http.HttpServletResponse;
  23
  24 import org.argeo.slc.msg.ExecutionAnswer;
  25 import org.springframework.web.servlet.ModelAndView;
  26 import org.springframework.web.servlet.mvc.AbstractController;
  27
  28 public abstract class AbstractServiceController extends AbstractController {
  29         public final static String KEY_ANSWER = "__answer";
  30
  31         private String viewName = null;
  32
  33         @Override
  34         protected final ModelAndView handleRequestInternal(
  35                         HttpServletRequest request, HttpServletResponse response)
  36                         throws Exception {
  37                 ModelAndView mv = new ModelAndView();
  38                 mv.setViewName(getViewName());
  39                 try {
  40                         handleServiceRequest(request, response, mv);
  41                 } catch (Exception e) {
  42                         e.printStackTrace();
  43                         StringWriter writer = new StringWriter();
  44                         e.printStackTrace(new PrintWriter(writer));
  45                         ExecutionAnswer answer = ExecutionAnswer.error(writer.toString());
  46                         ModelAndView errorMv = new ModelAndView();
  47                         errorMv.addObject(KEY_ANSWER, answer);
  48                         errorMv.setViewName(KEY_ANSWER);
  49                         return errorMv;
  50                 }
  51
  52                 if (mv.getModel().size() == 0) {
  53                         mv.addObject(KEY_ANSWER, ExecutionAnswer
  54                                         .ok("Execution completed properly"));
  55                 }
  56
  57                 if (mv.getViewName() == null && mv.getModel().size() == 1)
  58                         mv.setViewName(mv.getModel().keySet().iterator().next().toString());
  59
  60                 return mv;
  61         }
  62
  63         protected abstract void handleServiceRequest(HttpServletRequest request,
  64                         HttpServletResponse response, ModelAndView modelAndView)
  65                         throws Exception;
  66
  67         public void setViewName(String viewName) {
  68                 this.viewName = viewName;
  69         }
  70
  71         public String getViewName() {
  72                 return viewName;
  73         }
  74
  75 }