com.fasterxml.jackson.databind.node

Class NullNode

java.lang.Object

com.fasterxml.jackson.databind.JsonNode

com.fasterxml.jackson.databind.node.BaseJsonNode

com.fasterxml.jackson.databind.node.ValueNode

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

Fields

Modifier and Type	Field and Description
static NullNode	instance

Method Summary

Methods

Modifier and Type	Method and Description
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.
String	asText(String defaultValue) Method similar to JsonNode.asText(), except that it will return defaultValue in cases where null value would be returned; either for missing nodes (trying to access missing property, or element at invalid item for array) or explicit nulls.
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()
JsonNodeType	getNodeType() Return the type of this node
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

_at, deepCopy, findParent, findParents, findValue, findValues, findValuesAsText, get, get, has, has, hasNonNull, hasNonNull, path, path, serializeWithType, toString

Methods inherited from class com.fasterxml.jackson.databind.node.BaseJsonNode

findPath, numberType, traverse, traverse

Methods inherited from class com.fasterxml.jackson.databind.JsonNode

asBoolean, asBoolean, asDouble, asDouble, asInt, asInt, asLong, asLong, at, at, bigIntegerValue, binaryValue, booleanValue, canConvertToInt, canConvertToLong, decimalValue, doubleValue, elements, fieldNames, fields, findParents, findValues, findValuesAsText, floatValue, intValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloat, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNull, isNumber, isObject, isPojo, isShort, isTextual, isValueNode, iterator, longValue, numberValue, shortValue, 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()

getNodeType

public JsonNodeType getNodeType()

Description copied from class: JsonNode

Return the type of this node

Specified by:

getNodeType in class JsonNode

Returns:

the node type as a JsonNodeType enum value

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

asText

public String asText(String defaultValue)

Description copied from class: JsonNode

Method similar to JsonNode.asText(), except that it will return defaultValue in cases where null value would be returned; either for missing nodes (trying to access missing property, or element at invalid item for array) or explicit nulls.

Overrides:

asText 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