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

Fields inherited from class org.codehaus.jackson.JsonNode

NO_NODES, NO_STRINGS

Method Summary

double	asDouble(double defaultValue) Method that will try to convert value of this node to a Java double.
int	asInt(int defaultValue) Method that will try to convert value of this node to a Java int.
long	asLong(long defaultValue) Method that will try to convert value of this node to a Java long.
String	asText() 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.
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 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, serializeWithType, toString

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

findParent, findParents, findPath, findValue, findValues, findValuesAsText, getNumberType, traverse

Methods inherited from class org.codehaus.jackson.JsonNode

asBoolean, asBoolean, asDouble, asInt, asLong, findParents, findValues, findValuesAsText, get, get, getBigIntegerValue, getBinaryValue, getBooleanValue, getDecimalValue, getDoubleValue, getElements, getFieldNames, getFields, getIntValue, getLongValue, getNumberValue, getPath, getPath, getTextValue, getValueAsBoolean, getValueAsBoolean, getValueAsDouble, getValueAsDouble, getValueAsInt, getValueAsInt, getValueAsLong, getValueAsLong, getValueAsText, has, has, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNumber, isObject, isPojo, isTextual, iterator, size, with

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

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