Class NullNode

All Implemented Interfaces:
Iterable<JsonNode>, JsonSerializable, JsonSerializableWithType

public final class NullNode extends ValueNode
This singleton value class is used to contain explicit JSON null value.
  • Field Details

    • instance

      public static final NullNode instance
  • Method Details

    • getInstance

      public static NullNode getInstance()
    • asToken

      public JsonToken asToken()
      Description copied from class: BaseJsonNode
      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 class ValueNode
    • isNull

      public boolean isNull()
      Description copied from class: JsonNode
      Method that can be used to check if this node was created from Json liternal null value.
      Overrides:
      isNull in class JsonNode
    • asText

      public String asText()
      Description copied from class: JsonNode
      Method that will return valid String representation of the container value, if the node is a value node (method JsonNode.isValueNode() returns true), otherwise empty String.
      Specified by:
      asText in class JsonNode
    • asInt

      public int asInt(int defaultValue)
      Description copied from class: JsonNode
      Method that will try to convert value of this node to a Java int. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

      If representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.

      Overrides:
      asInt in class JsonNode
    • asLong

      public long asLong(long defaultValue)
      Description copied from class: JsonNode
      Method that will try to convert value of this node to a Java long. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

      If representation can not be converted to an long (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.

      Overrides:
      asLong in class JsonNode
    • asDouble

      public double asDouble(double defaultValue)
      Description copied from class: JsonNode
      Method that will try to convert value of this node to a Java double. Numbers are coerced using default Java rules; booleans convert to 0.0 (false) and 1.0 (true), and Strings are parsed using default Java language integer parsing rules.

      If representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.

      Overrides:
      asDouble in class JsonNode
    • serialize

      public final void serialize(JsonGenerator jg, SerializerProvider provider) throws IOException, JsonProcessingException
      Description copied from class: BaseJsonNode
      Method called to serialize node instances using given generator.
      Specified by:
      serialize in interface JsonSerializable
      Specified by:
      serialize in class BaseJsonNode
      Throws:
      IOException
      JsonProcessingException
    • equals

      public boolean equals(Object o)
      Description copied from class: JsonNode
      Equality for node objects is defined as full (deep) value equality. This means that it is possible to compare complete JSON trees for equality by comparing equality of root nodes.

      Note: marked as abstract to ensure all implementation classes define it properly and not rely on definition from Object.

      Specified by:
      equals in class JsonNode