public Set<String> getOperatorClasses(String parent, String searchTerm)
      throws ClassNotFoundException {
    if (CollectionUtils.isEmpty(operatorClassNames)) {
      loadOperatorClass();
    }
    if (parent == null) {
      parent = Operator.class.getName();
    } else {
      if (!typeGraph.isAncestor(Operator.class.getName(), parent)) {
        throw new IllegalArgumentException("Argument must be a subclass of Operator class");
      }
    }

    Set<String> filteredClass =
        Sets.filter(
            operatorClassNames,
            new Predicate<String>() {
              @Override
              public boolean apply(String className) {
                OperatorClassInfo oci = classInfo.get(className);
                return oci == null || !oci.tags.containsKey("@omitFromUI");
              }
            });

    if (searchTerm == null && parent.equals(Operator.class.getName())) {
      return filteredClass;
    }

    if (searchTerm != null) {
      searchTerm = searchTerm.toLowerCase();
    }

    Set<String> result = new HashSet<String>();
    for (String clazz : filteredClass) {
      if (parent.equals(Operator.class.getName()) || typeGraph.isAncestor(parent, clazz)) {
        if (searchTerm == null) {
          result.add(clazz);
        } else {
          if (clazz.toLowerCase().contains(searchTerm)) {
            result.add(clazz);
          } else {
            OperatorClassInfo oci = classInfo.get(clazz);
            if (oci != null) {
              if (oci.comment != null && oci.comment.toLowerCase().contains(searchTerm)) {
                result.add(clazz);
              } else {
                for (Map.Entry<String, String> entry : oci.tags.entrySet()) {
                  if (entry.getValue().toLowerCase().contains(searchTerm)) {
                    result.add(clazz);
                    break;
                  }
                }
              }
            }
          }
        }
      }
    }
    return result;
  }
 private void addTagToMethod(
     Map<String, MethodInfo> methods, String tagText, MethodTagType tagType) {
   MethodInfo mi = methods.get(methodName);
   if (mi == null) {
     mi = new MethodInfo();
     methods.put(methodName, mi);
   }
   if (tagType == MethodTagType.OMIT_FROM_UI) {
     mi.omitFromUI = true;
     return;
   }
   String[] tagParts =
       Iterables.toArray(
           Splitter.on(WHITESPACE_PATTERN)
               .trimResults()
               .omitEmptyStrings()
               .limit(2)
               .split(tagText),
           String.class);
   if (tagParts.length == 2) {
     if (tagType == MethodTagType.DESCRIPTION) {
       mi.descriptions.put(tagParts[0], tagParts[1]);
     } else {
       mi.useSchemas.put(tagParts[0], tagParts[1]);
     }
   }
 }
  private void putFieldDescription(CompactFieldNode field, JSONObject port, TypeGraphVertex tgv)
      throws JSONException {
    OperatorClassInfo oci = classInfo.get(tgv.typeName);
    if (oci != null) {
      String fieldDesc = oci.fields.get(field.getName());
      if (fieldDesc != null) {
        port.put("description", fieldDesc);
        return;
      }
    }

    for (TypeGraphVertex ancestor : tgv.getAncestors()) {
      putFieldDescription(field, port, ancestor);
    }
  }
  private OperatorClassInfo getOperatorClassWithGetterSetter(
      TypeGraphVertex tgv, String setterName, String getterName) {
    OperatorClassInfo oci = classInfo.get(tgv.typeName);
    if (oci != null
        && (oci.getMethods.containsKey(getterName) || oci.setMethods.containsKey(setterName))) {
      return oci;
    } else {
      if (tgv.getAncestors() != null) {
        for (TypeGraphVertex ancestor : tgv.getAncestors()) {
          return getOperatorClassWithGetterSetter(ancestor, setterName, getterName);
        }
      }
    }

    return null;
  }
  private JSONArray getClassProperties(Class<?> clazz, int level) throws IntrospectionException {
    JSONArray arr = new JSONArray();
    TypeDiscoverer td = new TypeDiscoverer();
    try {
      for (PropertyDescriptor pd : Introspector.getBeanInfo(clazz).getPropertyDescriptors()) {
        Method readMethod = pd.getReadMethod();
        if (readMethod != null) {
          if (readMethod.getDeclaringClass() == java.lang.Enum.class) {
            // skip getDeclaringClass
            continue;
          } else if ("class".equals(pd.getName())) {
            // skip getClass
            continue;
          }
        } else {
          // yields com.datatorrent.api.Context on JDK6 and
          // com.datatorrent.api.Context.OperatorContext with JDK7
          if ("up".equals(pd.getName())
              && com.datatorrent.api.Context.class.isAssignableFrom(pd.getPropertyType())) {
            continue;
          }
        }
        // LOG.info("name: " + pd.getName() + " type: " + pd.getPropertyType());

        Class<?> propertyType = pd.getPropertyType();
        if (propertyType != null) {
          JSONObject propertyObj = new JSONObject();
          propertyObj.put("name", pd.getName());
          propertyObj.put("canGet", readMethod != null);
          propertyObj.put("canSet", pd.getWriteMethod() != null);
          if (readMethod != null) {
            for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {
              OperatorClassInfo oci = classInfo.get(c.getName());
              if (oci != null) {
                MethodInfo getMethodInfo = oci.getMethods.get(readMethod.getName());
                if (getMethodInfo != null) {
                  addTagsToProperties(getMethodInfo, propertyObj);
                  break;
                }
              }
            }
            // type can be a type symbol or parameterized type
            td.setTypeArguments(clazz, readMethod.getGenericReturnType(), propertyObj);
          } else {
            if (pd.getWriteMethod() != null) {
              td.setTypeArguments(
                  clazz, pd.getWriteMethod().getGenericParameterTypes()[0], propertyObj);
            }
          }
          // if (!propertyType.isPrimitive() && !propertyType.isEnum() && !propertyType.isArray() &&
          // !propertyType.getName().startsWith("java.lang") && level < MAX_PROPERTY_LEVELS) {
          //  propertyObj.put("properties", getClassProperties(propertyType, level + 1));
          // }
          arr.put(propertyObj);
        }
      }
    } catch (JSONException ex) {
      throw new RuntimeException(ex);
    }
    return arr;
  }
  public JSONObject describeOperator(String clazz) throws Exception {
    TypeGraphVertex tgv = typeGraph.getTypeGraphVertex(clazz);
    if (tgv.isInstantiable()) {
      JSONObject response = new JSONObject();
      JSONArray inputPorts = new JSONArray();
      JSONArray outputPorts = new JSONArray();
      // Get properties from ASM

      JSONObject operatorDescriptor = describeClassByASM(clazz);
      JSONArray properties = operatorDescriptor.getJSONArray("properties");

      properties = enrichProperties(clazz, properties);

      JSONArray portTypeInfo = operatorDescriptor.getJSONArray("portTypeInfo");

      List<CompactFieldNode> inputPortfields = typeGraph.getAllInputPorts(clazz);
      List<CompactFieldNode> outputPortfields = typeGraph.getAllOutputPorts(clazz);

      try {
        for (CompactFieldNode field : inputPortfields) {
          JSONObject inputPort = setFieldAttributes(clazz, field);
          if (!inputPort.has("optional")) {
            inputPort.put(
                "optional",
                false); // input port that is not annotated is default to be not optional
          }
          if (!inputPort.has(SCHEMA_REQUIRED_KEY)) {
            inputPort.put(SCHEMA_REQUIRED_KEY, false);
          }
          inputPorts.put(inputPort);
        }

        for (CompactFieldNode field : outputPortfields) {
          JSONObject outputPort = setFieldAttributes(clazz, field);

          if (!outputPort.has("optional")) {
            outputPort.put(
                "optional", true); // output port that is not annotated is default to be optional
          }
          if (!outputPort.has("error")) {
            outputPort.put("error", false);
          }
          if (!outputPort.has(SCHEMA_REQUIRED_KEY)) {
            outputPort.put(SCHEMA_REQUIRED_KEY, false);
          }
          outputPorts.put(outputPort);
        }

        response.put("name", clazz);
        response.put("properties", properties);
        response.put(PORT_TYPE_INFO_KEY, portTypeInfo);
        response.put("inputPorts", inputPorts);
        response.put("outputPorts", outputPorts);

        OperatorClassInfo oci = classInfo.get(clazz);

        if (oci != null) {
          if (oci.comment != null) {
            String[] descriptions;
            // first look for a <p> tag
            String keptPrefix = "<p>";
            descriptions = oci.comment.split("<p>", 2);
            if (descriptions.length == 0) {
              keptPrefix = "";
              // if no <p> tag, then look for a blank line
              descriptions = oci.comment.split("\n\n", 2);
            }
            if (descriptions.length > 0) {
              response.put("shortDesc", descriptions[0]);
            }
            if (descriptions.length > 1) {
              response.put("longDesc", keptPrefix + descriptions[1]);
            }
          }
          response.put("category", oci.tags.get("@category"));
          String displayName = oci.tags.get("@displayName");
          if (displayName == null) {
            displayName = decamelizeClassName(ClassUtils.getShortClassName(clazz));
          }
          response.put("displayName", displayName);
          String tags = oci.tags.get("@tags");
          if (tags != null) {
            JSONArray tagArray = new JSONArray();
            for (String tag : StringUtils.split(tags, ',')) {
              tagArray.put(tag.trim().toLowerCase());
            }
            response.put("tags", tagArray);
          }
          String doclink = oci.tags.get("@doclink");
          if (doclink != null) {
            response.put("doclink", doclink + "?" + getDocName(clazz));
          } else if (clazz.startsWith("com.datatorrent.lib.")
              || clazz.startsWith("com.datatorrent.contrib.")) {
            response.put("doclink", DT_OPERATOR_DOCLINK_PREFIX + "?" + getDocName(clazz));
          }
        }
      } catch (JSONException ex) {
        throw new RuntimeException(ex);
      }
      return response;
    } else {
      throw new UnsupportedOperationException();
    }
  }
 static MethodTagType from(String tag) {
   return TAG_TEXT_MAPPING.get(tag);
 }