legacy/runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/JsonView.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.util.Map;
  19
  20 import javax.servlet.http.HttpServletRequest;
  21 import javax.servlet.http.HttpServletResponse;
  22
  23 import org.argeo.slc.SlcException;
  24 import org.springframework.web.servlet.view.AbstractView;
  25
  26 import com.springsource.json.writer.JSONObject;
  27
  28 /** Marshal one of the object of the map to the output. */
  29 public class JsonView extends AbstractView {
  30         private String modelKey = null;
  31
  32         public JsonView() {
  33         }
  34
  35         @Override
  36         @SuppressWarnings(value = { "unchecked" })
  37         protected void renderMergedOutputModel(Map model,
  38                         HttpServletRequest request, HttpServletResponse response)
  39                         throws Exception {
  40                 final Object answer;
  41                 if (modelKey != null) {
  42                         if (!model.containsKey(modelKey))
  43                                 throw new SlcException("Key " + modelKey
  44                                                 + " not found in model.");
  45                         answer = model.get(modelKey);
  46                 } else {
  47                         if (model.size() != 1)
  48                                 throw new SlcException(
  49                                                 "Model has a size different from 1. Specify a modelKey.");
  50                         answer = model.values().iterator().next();
  51                 }
  52
  53                 if (answer instanceof JSONObject) {
  54                         ((JSONObject) answer).write(response.getWriter());
  55                 } else {
  56                         JSONObject jsonObject = new JSONObject(answer);
  57                         jsonObject.write(response.getWriter());
  58                 }
  59         }
  60
  61         public void setModelKey(String modelKey) {
  62                 this.modelKey = modelKey;
  63         }
  64
  65 }