public final class MissingNode extends ValueNode
In most respects this placeholder node will act as NullNode
;
for example, for purposes of value conversions, value is considered
to be null and represented as value zero when used for numeric
conversions.
JsonSerializable.Base
Modifier | Constructor and Description |
---|---|
protected |
MissingNode()
NOTE: visibility raised to `protected` in 2.9.3 to allow custom subtypes.
|
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.
|
<T extends JsonNode> |
deepCopy()
All current value nodes are immutable, so we can just return
them as is.
|
boolean |
equals(Object o)
Equality for node objects is defined as full (deep) value
equality.
|
static MissingNode |
getInstance() |
JsonNodeType |
getNodeType()
Return the type of this node
|
int |
hashCode() |
boolean |
isMissingNode()
Method that returns true for "virtual" nodes which represent
missing entries constructed by path accessor methods when
there is no actual node matching given criteria.
|
void |
serialize(JsonGenerator jg,
SerializerProvider provider)
Method called to serialize node instances using given generator.
|
void |
serializeWithType(JsonGenerator g,
SerializerProvider provider,
TypeSerializer typeSer)
Type information is needed, even if JsonNode instances are "plain" JSON,
since they may be mixed with other types.
|
String |
toString()
Method that will produce developer-readable representation of the
node; which may or may not be as valid JSON.
|
_at, findParent, findParents, findValue, findValues, findValuesAsText, get, get, has, has, hasNonNull, hasNonNull, path, path
findPath, numberType, traverse, traverse
asBoolean, asBoolean, asDouble, asDouble, asInt, asInt, asLong, asLong, at, at, bigIntegerValue, binaryValue, booleanValue, canConvertToInt, canConvertToLong, decimalValue, doubleValue, elements, equals, fieldNames, fields, findParents, findValues, findValuesAsText, floatValue, intValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloat, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isNull, isNumber, isObject, isPojo, isShort, isTextual, isValueNode, iterator, longValue, numberValue, shortValue, size, textValue, with, withArray
isEmpty
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
forEach, spliterator
protected MissingNode()
NOTE: visibility raised to `protected` in 2.9.3 to allow custom subtypes.
public boolean isMissingNode()
TreeNode
Note: one and only one of methods TreeNode.isValueNode()
,
TreeNode.isContainerNode()
and TreeNode.isMissingNode()
ever
returns true for any given node.
isMissingNode
in interface TreeNode
isMissingNode
in class JsonNode
public <T extends JsonNode> T deepCopy()
ValueNode
public static MissingNode getInstance()
public JsonNodeType getNodeType()
JsonNode
getNodeType
in class JsonNode
JsonNodeType
enum valuepublic JsonToken asToken()
BaseJsonNode
JsonToken
that equivalent
stream event would produce (for most nodes there is just
one token but for structured/container types multiple)public String asText()
JsonNode
JsonNode.isValueNode()
returns true),
otherwise empty String.public String asText(String defaultValue)
JsonNode
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.public final void serialize(JsonGenerator jg, SerializerProvider provider) throws IOException, JsonProcessingException
BaseJsonNode
serialize
in interface JsonSerializable
serialize
in class BaseJsonNode
IOException
JsonProcessingException
public void serializeWithType(JsonGenerator g, SerializerProvider provider, TypeSerializer typeSer) throws IOException, JsonProcessingException
BaseJsonNode
serializeWithType
in interface JsonSerializable
serializeWithType
in class ValueNode
IOException
JsonProcessingException
public boolean equals(Object o)
JsonNode
Note: marked as abstract to ensure all implementation
classes define it properly and not rely on definition
from Object
.
public String toString()
JsonNode
ObjectMapper
or ObjectWriter
to serialize an
instance, for example:
String json = objectMapper.writeValueAsString(rootNode);
Note: method defined as abstract to ensure all implementation
classes explicitly implement method, instead of relying
on Object.toString()
definition.
public int hashCode()
hashCode
in class BaseJsonNode
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