com.fasterxml.jackson.databind.node
Class NullNode

java.lang.Object
  extended by com.fasterxml.jackson.databind.JsonNode
      extended by com.fasterxml.jackson.databind.node.BaseJsonNode
          extended by com.fasterxml.jackson.databind.node.ValueNode
              extended by com.fasterxml.jackson.databind.node.NullNode
All Implemented Interfaces:
TreeNode, JsonSerializable, Iterable<JsonNode>

public final class NullNode
extends ValueNode

This singleton value class is used to contain explicit JSON null value.


Field Summary
static NullNode instance
           
 
Fields inherited from class com.fasterxml.jackson.databind.JsonNode
NO_NODES, NO_STRINGS
 
Method Summary
 String asText()
          Method that will return a valid String representation of the container value, if the node is a value node (method JsonNode.isValueNode() returns true), otherwise empty String.
 JsonToken asToken()
          Method that can be used for efficient type detection when using stream abstraction for traversing nodes.
 boolean equals(Object o)
          Equality for node objects is defined as full (deep) value equality.
static NullNode getInstance()
           
 boolean isNull()
          Method that can be used to check if this node was created from JSON literal null value.
 void serialize(JsonGenerator jg, SerializerProvider provider)
          Method called to serialize node instances using given generator.
 
Methods inherited from class com.fasterxml.jackson.databind.node.ValueNode
deepCopy, isValueNode, path, path, serializeWithType, toString
 
Methods inherited from class com.fasterxml.jackson.databind.node.BaseJsonNode
findParent, findParents, findPath, findValue, findValues, findValuesAsText, numberType, traverse
 
Methods inherited from class com.fasterxml.jackson.databind.JsonNode
asBoolean, asBoolean, asDouble, asDouble, asInt, asInt, asLong, asLong, bigIntegerValue, binaryValue, booleanValue, canConvertToInt, canConvertToLong, decimalValue, doubleValue, elements, fieldNames, fields, findParents, findValues, findValuesAsText, get, get, has, has, hasNonNull, hasNonNull, intValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNumber, isObject, isPojo, isTextual, iterator, longValue, numberValue, size, textValue, with, withArray
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

instance

public static final NullNode instance
Method Detail

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 interface TreeNode
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 literal null value.

Overrides:
isNull in class JsonNode

asText

public String asText()
Description copied from class: JsonNode
Method that will return a 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

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


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