org.codehaus.jackson.node
Class NullNode

java.lang.Object
  org.codehaus.jackson.JsonNode
      org.codehaus.jackson.node.BaseJsonNode
          org.codehaus.jackson.node.ValueNode
              org.codehaus.jackson.node.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 Summary

static NullNode

instance

Method Summary

JsonToken	asToken() Method that can be used for efficient type detection when using stream abstraction for traversing nodes.
boolean	equals(Object o) Note: marked as abstract to ensure all implementation classes define it properly.
static NullNode	getInstance()
String	getValueAsText() Method that will return valid String representation of the container value, if the node is a value node (method JsonNode.isValueNode() returns true), otherwise null.
boolean	isNull() Method that can be used to check if this node was created from Json liternal null value.
void	serialize(JsonGenerator jg, SerializerProvider provider) Method called to serialize node instances using given generator.

Methods inherited from class org.codehaus.jackson.node.ValueNode

isValueNode, path, path, toString

Methods inherited from class org.codehaus.jackson.node.BaseJsonNode

getNumberType, serializeWithType, traverse, writeTo

Methods inherited from class org.codehaus.jackson.JsonNode

get, get, getBigIntegerValue, getBinaryValue, getBooleanValue, getDecimalValue, getDoubleValue, getElements, getElementValue, getFieldNames, getFieldValue, getIntValue, getLongValue, getNumberValue, getPath, getPath, getTextValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNumber, isObject, isPojo, isTextual, iterator, size

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 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

getValueAsText

public String getValueAsText()

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 null.

Note: to serialize nodes of any type, you should call JsonNode.toString() instead.

Specified by:

getValueAsText 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

Note: marked as abstract to ensure all implementation classes define it properly.

Specified by:

equals in class JsonNode