Class BaseJsonNode

All Implemented Interfaces:
com.fasterxml.jackson.core.TreeNode, JsonSerializable, Serializable, Iterable<JsonNode>
Direct Known Subclasses:
ContainerNode, ValueNode

public abstract class BaseJsonNode extends JsonNode implements Serializable
Abstract base class common to all standard JsonNode implementations. The main addition here is that we declare that sub-classes must implement JsonSerializable. This simplifies object mapping aspects a bit, as no external serializers are needed.

Since 2.10, all implements have been Serializable.

See Also:
  • Constructor Details

    • BaseJsonNode

      protected BaseJsonNode()
  • Method Details

    • findPath

      public final JsonNode findPath(String fieldName)
      Description copied from class: JsonNode
      Method similar to JsonNode.findValue(java.lang.String), but that will return a "missing node" instead of null if no field is found. Missing node is a specific kind of node for which JsonNode.isMissingNode() returns true; and all value access methods return empty or missing value.
      Specified by:
      findPath in class JsonNode
      Parameters:
      fieldName - Name of field to look for
      Returns:
      Value of first matching node found; or if not found, a "missing node" (non-null instance that has no value)
    • hashCode

      public abstract int hashCode()
      Overrides:
      hashCode in class Object
    • required

      public JsonNode required(String fieldName)
      Description copied from class: JsonNode
      Method is functionally equivalent to path(fieldName).required() and can be used to check that this node is an ObjectNode (that is, represents JSON Object value) and has value for specified property with key fieldName (but note that value may be explicit JSON null value). If this node is Object Node and has value for specified property, matching value is returned; otherwise IllegalArgumentException is thrown.
      Overrides:
      required in class JsonNode
      Parameters:
      fieldName - Name of property to access
      Returns:
      Value of the specified property of this Object node
    • required

      public JsonNode required(int index)
      Description copied from class: JsonNode
      Method is functionally equivalent to path(index).required() and can be used to check that this node is an ArrayNode (that is, represents JSON Array value) and has value for specified index (but note that value may be explicit JSON null value). If this node is Array Node and has value for specified index, value at index is returned; otherwise IllegalArgumentException is thrown.
      Overrides:
      required in class JsonNode
      Parameters:
      index - Index of the value of this Array node to access
      Returns:
      Value at specified index of this Array node
    • traverse

      public com.fasterxml.jackson.core.JsonParser traverse()
      Specified by:
      traverse in interface com.fasterxml.jackson.core.TreeNode
    • traverse

      public com.fasterxml.jackson.core.JsonParser traverse(com.fasterxml.jackson.core.ObjectCodec codec)
      Specified by:
      traverse in interface com.fasterxml.jackson.core.TreeNode
    • asToken

      public abstract com.fasterxml.jackson.core.JsonToken asToken()
      Method that can be used for efficient type detection when using stream abstraction for traversing nodes. Will return the first JsonToken that equivalent stream event would produce (for most nodes there is just one token but for structured/container types multiple)
      Specified by:
      asToken in interface com.fasterxml.jackson.core.TreeNode
    • numberType

      public com.fasterxml.jackson.core.JsonParser.NumberType numberType()
      Returns code that identifies type of underlying numeric value, if (and only if) node is a number node.
      Specified by:
      numberType in interface com.fasterxml.jackson.core.TreeNode
    • serialize

      public abstract void serialize(com.fasterxml.jackson.core.JsonGenerator jgen, SerializerProvider provider) throws IOException
      Method called to serialize node instances using given generator.
      Specified by:
      serialize in interface JsonSerializable
      Throws:
      IOException
    • serializeWithType

      public abstract void serializeWithType(com.fasterxml.jackson.core.JsonGenerator jgen, SerializerProvider provider, TypeSerializer typeSer) throws IOException
      Type information is needed, even if JsonNode instances are "plain" JSON, since they may be mixed with other types.
      Specified by:
      serializeWithType in interface JsonSerializable
      Throws:
      IOException
    • toString

      public String toString()
      Description copied from class: JsonNode
      Method that will produce (as of Jackson 2.10) valid JSON using default settings of databind, as String. If you want other kinds of JSON output (or output formatted using one of other Jackson-supported data formats) make sure to use ObjectMapper or ObjectWriter to serialize an instance, for example:
         String json = objectMapper.writeValueAsString(rootNode);
      

      Note: method defined as abstract to ensure all implementation classes explicitly implement method, instead of relying on Object.toString() definition.

      Specified by:
      toString in class JsonNode
    • toPrettyString

      public String toPrettyString()
      Description copied from class: JsonNode
      Alternative to JsonNode.toString() that will serialize this node using Jackson default pretty-printer.
      Overrides:
      toPrettyString in class JsonNode