content: package com.open.capacity.activiti.rest.editor.model;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import lombok.extern.slf4j.Slf4j;
  import org.activiti.editor.constants.ModelDataJsonConstants;
  import org.activiti.engine.ActivitiException;
  import org.activiti.engine.RepositoryService;
  import org.activiti.engine.repository.Model;
  import org.apache.commons.lang3.StringUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RestController;
  
  /**
   * @author Tijs Rademakers
   */
  @RestController
  @RequestMapping("service")
  @Slf4j
  public class ModelEditorJsonRestResource implements ModelDataJsonConstants {
  
      @Autowired
      private RepositoryService repositoryService;
  
      @Autowired
      private ObjectMapper objectMapper;
  
      @RequestMapping(value = "/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")
      public ObjectNode getEditorJson(@PathVariable String modelId) {
          ObjectNode modelNode = null;
  
          Model model = repositoryService.getModel(modelId);
  
          if (model != null) {
              try {
                  if (StringUtils.isNotEmpty(model.getMetaInfo())) {
                      modelNode = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
                  } else {
                      modelNode = objectMapper.createObjectNode();
                      modelNode.put(MODEL_NAME, model.getName());
                  }
                  modelNode.put(MODEL_ID, model.getId());
                  ObjectNode editorJsonNode = (ObjectNode) objectMapper.readTree(
                          new String(repositoryService.getModelEditorSource(model.getId()), "utf-8"));
                  modelNode.set("model", editorJsonNode);
  
              } catch (Exception e) {
                  log.error("Error creating model JSON", e);
                  throw new ActivitiException("Error creating model JSON", e);
              }
          }
          return modelNode;
      }
  }
  