runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/JsonView.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.util.Map;
  20
  21 import javax.servlet.http.HttpServletRequest;
  22 import javax.servlet.http.HttpServletResponse;
  23
  24 import org.argeo.slc.SlcException;
  25 import org.springframework.web.servlet.view.AbstractView;
  26
  27 import com.springsource.json.writer.JSONObject;
  28
  29 /** Marshal one of the object of the map to the output. */
  30 public class JsonView extends AbstractView {
  31         private String modelKey = null;
  32
  33         public JsonView() {
  34         }
  35
  36         @Override
  37         @SuppressWarnings(value = { "unchecked" })
  38         protected void renderMergedOutputModel(Map model,
  39                         HttpServletRequest request, HttpServletResponse response)
  40                         throws Exception {
  41                 final Object answer;
  42                 if (modelKey != null) {
  43                         if (!model.containsKey(modelKey))
  44                                 throw new SlcException("Key " + modelKey
  45                                                 + " not found in model.");
  46                         answer = model.get(modelKey);
  47                 } else {
  48                         if (model.size() != 1)
  49                                 throw new SlcException(
  50                                                 "Model has a size different from 1. Specify a modelKey.");
  51                         answer = model.values().iterator().next();
  52                 }
  53
  54                 if (answer instanceof JSONObject) {
  55                         ((JSONObject) answer).write(response.getWriter());
  56                 } else {
  57                         JSONObject jsonObject = new JSONObject(answer);
  58                         jsonObject.write(response.getWriter());
  59                 }
  60         }
  61
  62         public void setModelKey(String modelKey) {
  63                 this.modelKey = modelKey;
  64         }
  65
  66 }