com.fasterxml.jackson.databind.JsonNode.isNull()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中com.fasterxml.jackson.databind.JsonNode.isNull()方法的一些代码示例，展示了JsonNode.isNull()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。JsonNode.isNull()方法的具体详情如下：
包路径：com.fasterxml.jackson.databind.JsonNode
类名称：JsonNode
方法名：isNull

JsonNode.isNull介绍

[英]Method that can be used to check if this node was created from JSON literal null value.
[中]方法，该方法可用于检查此节点是否是从JSON文本空值创建的。

代码示例

代码示例来源：origin: redisson/redisson

/**
 * Method that is similar to {@link #has(String)}, but that will
 * return <code>false</code> for explicitly added nulls.
 *<p>
 * This method is functionally equivalent to:
 *<pre>
 *   node.get(fieldName) != null &amp;&amp; !node.get(fieldName).isNull()
 *</pre>
 * 
 * @since 2.1
 */
public boolean hasNonNull(String fieldName) {
  JsonNode n = get(fieldName);
  return (n != null) && !n.isNull();
}

代码示例来源：origin: Activiti/Activiti

public static String getValueAsString(String name, JsonNode objectNode) {
 String propertyValue = null;
 JsonNode propertyNode = objectNode.get(name);
 if (propertyNode != null && !propertyNode.isNull()) {
  propertyValue = propertyNode.asText();
 }
 return propertyValue;
}

代码示例来源：origin: Activiti/Activiti

protected static String getActiveValue(String originalValue, String propertyName, ObjectNode elementProperties) {
 String activeValue = originalValue;
 if (elementProperties != null) {
  JsonNode overrideValueNode = elementProperties.get(propertyName);
  if (overrideValueNode != null) {
   if (overrideValueNode.isNull()) {
    activeValue = null;
   } else {
    activeValue = overrideValueNode.asText();
   }
  }
 }
 return activeValue;
}

代码示例来源：origin: Activiti/Activiti

protected String getValueAsString(String name,
                 JsonNode objectNode) {
  String propertyValue = null;
  JsonNode propertyNode = objectNode.get(name);
  if (propertyNode != null && !propertyNode.isNull()) {
    propertyValue = propertyNode.asText();
  }
  return propertyValue;
}

代码示例来源：origin: Activiti/Activiti

protected String getActiveValue(String originalValue, String propertyName, ObjectNode taskElementProperties) {
 String activeValue = originalValue;
 if (taskElementProperties != null) {
  JsonNode overrideValueNode = taskElementProperties.get(propertyName);
  if (overrideValueNode != null) {
   if (overrideValueNode.isNull()) {
    activeValue = null;
   } else {
    activeValue = overrideValueNode.asText();
   }
  }
 }
 return activeValue;
}

代码示例来源：origin: redisson/redisson

/**
 * Method that is similar to {@link #has(int)}, but that will
 * return <code>false</code> for explicitly added nulls.
 *<p>
 * This method is equivalent to:
 *<pre>
 *   node.get(index) != null &amp;&amp; !node.get(index).isNull()
 *</pre>
 * 
 * @since 2.1
 */
public boolean hasNonNull(int index) {
  JsonNode n = get(index);
  return (n != null) && !n.isNull();
}

代码示例来源：origin: Activiti/Activiti

protected List<String> getValueAsList(String name,
                   JsonNode objectNode) {
  List<String> resultList = new ArrayList<String>();
  JsonNode valuesNode = objectNode.get(name);
  if (valuesNode != null) {
    for (JsonNode valueNode : valuesNode) {
      if (valueNode.get("value") != null && !valueNode.get("value").isNull()) {
        resultList.add(valueNode.get("value").asText());
      }
    }
  }
  return resultList;
}

代码示例来源：origin: auth0/java-jwt

String getString(Map<String, JsonNode> tree, String claimName) {
    JsonNode node = tree.get(claimName);
    if (node == null || node.isNull()) {
      return null;
    }
    return node.asText(null);
  }
}

代码示例来源：origin: Activiti/Activiti

protected boolean getValueAsBoolean(String name,
                  JsonNode objectNode) {
  boolean propertyValue = false;
  JsonNode propertyNode = objectNode.get(name);
  if (propertyNode != null && !propertyNode.isNull()) {
    propertyValue = propertyNode.asBoolean();
  }
  return propertyValue;
}

代码示例来源：origin: Activiti/Activiti

protected void setOutcomeConditionExpression(SequenceFlow flow, JsonNode expressionNode) {
 Long formId = null;
 if (expressionNode.get("outcomeFormId") != null && !(expressionNode.get("outcomeFormId").isNull())) {
  formId = expressionNode.get("outcomeFormId").asLong();
 }
 String operator = null;
 if (expressionNode.get("operator") != null && expressionNode.get("operator").isNull() == false) {
  operator = expressionNode.get("operator").asText();
 }
 String outcomeName = null;
 if (expressionNode.get("outcomeName") != null && !(expressionNode.get("outcomeName").isNull())) {
  outcomeName = expressionNode.get("outcomeName").asText();
 }
 if (formId != null && operator != null && outcomeName != null) {
  flow.setConditionExpression("${form" + formId + "outcome " + operator + " " + outcomeName + "}");
  addExtensionElement("conditionFormId", String.valueOf(formId), flow);
  addExtensionElement("conditionOperator", operator, flow);
  addExtensionElement("conditionOutcomeName", outcomeName, flow);
 }
}

代码示例来源：origin: auth0/java-jwt

String getString(Map<String, JsonNode> tree, String claimName) {
    JsonNode node = tree.get(claimName);
    if (node == null || node.isNull()) {
      return null;
    }
    return node.asText(null);
  }
}

代码示例来源：origin: Activiti/Activiti

protected boolean doesElementPropertyExist(String id, String propertyName, ObjectNode infoNode) {
 boolean exists = false;
 if (infoNode.get(BPMN_NODE) != null && infoNode.get(BPMN_NODE).get(id) != null && infoNode.get(BPMN_NODE).get(id).get(propertyName) != null) {
  JsonNode propNode = infoNode.get(BPMN_NODE).get(id).get(propertyName);
  if (!propNode.isNull()) {
   exists = true;
  }
 }
 return exists;
}

代码示例来源：origin: Activiti/Activiti

protected void setFieldConditionExpression(SequenceFlow flow, JsonNode expressionNode) {
 String fieldId = null;
 if (expressionNode.get("fieldId") != null && !(expressionNode.get("fieldId").isNull())) {
  fieldId = expressionNode.get("fieldId").asText();
 }
 String operator = null;
 if (expressionNode.get("operator") != null && !(expressionNode.get("operator").isNull())) {
  operator = expressionNode.get("operator").asText();
 }
 String value = null;
 if (expressionNode.get("value") != null && !(expressionNode.get("value").isNull())) {
  value = expressionNode.get("value").asText();
 }
 if (fieldId != null && operator != null && value != null) {
  flow.setConditionExpression("${" + fieldId + " " + operator + " " + value + "}");
  addExtensionElement("conditionFieldId", fieldId, flow);
  addExtensionElement("conditionOperator", operator, flow);
  addExtensionElement("conditionValue", value, flow);
 }
}

代码示例来源：origin: Activiti/Activiti

public static String getPropertyValueAsString(String name, JsonNode objectNode) {
 String propertyValue = null;
 JsonNode propertyNode = getProperty(name, objectNode);
 if (propertyNode != null && propertyNode.isNull() == false) {
  propertyValue = propertyNode.asText();
 }
 return propertyValue;
}

代码示例来源：origin: apache/avro

return defaultValue.isBoolean();
case NULL:
 return defaultValue.isNull();
case ARRAY:
 if (!defaultValue.isArray())
  if (!isValidDefault(field.schema(),
            defaultValue.has(field.name())
            ? defaultValue.get(field.name())
            : field.defaultValue()))
   return false;

代码示例来源：origin: auth0/java-jwt

List<String> getStringOrArray(Map<String, JsonNode> tree, String claimName) throws JWTDecodeException {
  JsonNode node = tree.get(claimName);
  if (node == null || node.isNull() || !(node.isArray() || node.isTextual())) {
    return null;
  }
  if (node.isTextual() && !node.asText().isEmpty()) {
    return Collections.singletonList(node.asText());
  }
  List<String> list = new ArrayList<>(node.size());
  for (int i = 0; i < node.size(); i++) {
    try {
      list.add(objectReader.treeToValue(node.get(i), String.class));
    } catch (JsonProcessingException e) {
      throw new JWTDecodeException("Couldn't map the Claim's array contents to String", e);
    }
  }
  return list;
}

代码示例来源：origin: Activiti/Activiti

protected void addExtensionElement(String name, JsonNode elementNode, UserTask task) {
 if (elementNode != null && !elementNode.isNull()  && StringUtils.isNotEmpty(elementNode.asText())) {
  addExtensionElement(name, elementNode.asText(), task);
 }
}

代码示例来源：origin: apache/incubator-pinot

public static Object extractValue(@Nullable JsonNode jsonValue, FieldSpec fieldSpec) {
 if (fieldSpec.isSingleValueField()) {
  if (jsonValue != null && !jsonValue.isNull()) {
   return extractSingleValue(jsonValue, fieldSpec.getDataType());
  } else {
   return fieldSpec.getDefaultNullValue();
  }
 } else {
  if (jsonValue != null && !jsonValue.isNull()) {
   if (jsonValue.isArray()) {
    int numValues = jsonValue.size();
    if (numValues != 0) {
     Object[] values = new Object[numValues];
     for (int i = 0; i < numValues; i++) {
      values[i] = extractSingleValue(jsonValue.get(i), fieldSpec.getDataType());
     }
     return values;
    } else {
     return new Object[]{fieldSpec.getDefaultNullValue()};
    }
   } else {
    return new Object[]{extractSingleValue(jsonValue, fieldSpec.getDataType())};
   }
  } else {
   return new Object[]{fieldSpec.getDefaultNullValue()};
  }
 }
}

代码示例来源：origin: Activiti/Activiti

Map<String, JsonNode> sourceRefMap) {
if (objectNode.get(EDITOR_CHILD_SHAPES) != null) {
  for (JsonNode jsonChildNode : objectNode.get(EDITOR_CHILD_SHAPES)) {
      if (targetNode != null && !targetNode.isNull()) {
        String targetRefId = targetNode.get(EDITOR_SHAPE_ID).asText();
        List<JsonNode> sourceAndTargetList = new ArrayList<JsonNode>();
        sourceAndTargetList.add(sourceRefMap.get(childNode.get(EDITOR_SHAPE_ID).asText()));
        sourceAndTargetList.add(shapeMap.get(targetRefId));
        sourceAndTargetMap.put(childEdgeId,

代码示例来源：origin: Activiti/Activiti

public static JsonNode validateIfNodeIsTextual(JsonNode node) {
 if (node != null && !node.isNull() && node.isTextual() && StringUtils.isNotEmpty(node.asText())) {
  try {
   node = validateIfNodeIsTextual(objectMapper.readTree(node.asText()));
  } catch(Exception e) {
   logger.error("Error converting textual node", e);
  }
 }
 return node;
}

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