public final class NullNode extends ValueNode
| 限定符和类型 | 字段和说明 |
|---|---|
static NullNode |
instance |
NO_NODES, NO_STRINGS| 限定符和类型 | 方法和说明 |
|---|---|
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.
|
isValueNode, path, path, serializeWithType, toStringfindParent, findParents, findPath, findValue, findValues, findValuesAsText, getNumberType, traverseasBoolean, 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, withpublic static final NullNode instance
public static NullNode getInstance()
public JsonToken asToken()
BaseJsonNodeJsonToken that equivalent
stream event would produce (for most nodes there is just
one token but for structured/container types multiple)public boolean isNull()
JsonNodepublic String asText()
JsonNodeJsonNode.isValueNode() returns true), otherwise
empty String.public int asInt(int defaultValue)
JsonNodeIf representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
public long asLong(long defaultValue)
JsonNodeIf representation can not be converted to an long (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
public double asDouble(double defaultValue)
JsonNodeIf representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.
public final void serialize(JsonGenerator jg, SerializerProvider provider) throws IOException, JsonProcessingException
BaseJsonNodeserialize 在接口中 JsonSerializableserialize 在类中 BaseJsonNodeIOExceptionJsonProcessingExceptionpublic boolean equals(Object o)
JsonNode
Note: marked as abstract to ensure all implementation
classes define it properly and not rely on definition
from Object.