Class NullNode
- java.lang.Object
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- com.fasterxml.jackson.databind.JsonSerializable.Base
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- com.fasterxml.jackson.databind.JsonNode
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- com.fasterxml.jackson.databind.node.BaseJsonNode
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- com.fasterxml.jackson.databind.node.ValueNode
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- com.fasterxml.jackson.databind.node.NullNode
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- All Implemented Interfaces:
com.fasterxml.jackson.core.TreeNode,JsonSerializable,Serializable,Iterable<JsonNode>
public class NullNode extends ValueNode
This singleton value class is used to contain explicit JSON null value.- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.JsonSerializable
JsonSerializable.Base
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Constructor Summary
Constructors Modifier Constructor Description protectedNullNode()NOTE: visibility raised to `protected` in 2.9.3 to allow custom subtypes.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description StringasText()Method that will return a valid String representation of the container value, if the node is a value node (methodJsonNode.isValueNode()returns true), otherwise empty String.StringasText(String defaultValue)Method similar toJsonNode.asText(), except that it will returndefaultValuein 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.com.fasterxml.jackson.core.JsonTokenasToken()Method that can be used for efficient type detection when using stream abstraction for traversing nodes.booleanequals(Object o)Equality for node objects is defined as full (deep) value equality.static NullNodegetInstance()JsonNodeTypegetNodeType()Return the type of this nodeinthashCode()protected ObjectreadResolve()JsonNoderequireNonNull()Method that may be called to verify thatthisnode is neither so-called "missing node" (that is, one for whichJsonNode.isMissingNode()returnstrue) nor "null node" (one for whichJsonNode.isNull()returnstrue).voidserialize(com.fasterxml.jackson.core.JsonGenerator g, 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, isEmpty, path, path, serializeWithType
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Methods inherited from class com.fasterxml.jackson.databind.node.BaseJsonNode
findPath, numberType, required, required, toPrettyString, toString, traverse, traverse
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Methods inherited from class com.fasterxml.jackson.databind.JsonNode
_reportRequiredViolation, _this, 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, isMissingNode, isNull, isNumber, isObject, isPojo, isShort, isTextual, isValueNode, iterator, longValue, numberValue, require, requiredAt, requiredAt, shortValue, size, textValue, with, withArray
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Methods inherited from class com.fasterxml.jackson.databind.JsonSerializable.Base
isEmpty
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.lang.Iterable
forEach, spliterator
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Field Detail
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instance
public static final NullNode instance
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Method Detail
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readResolve
protected Object readResolve()
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getInstance
public static NullNode getInstance()
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getNodeType
public JsonNodeType getNodeType()
Description copied from class:JsonNodeReturn the type of this node- Specified by:
getNodeTypein classJsonNode- Returns:
- the node type as a
JsonNodeTypeenum value
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asToken
public com.fasterxml.jackson.core.JsonToken asToken()
Description copied from class:BaseJsonNodeMethod that can be used for efficient type detection when using stream abstraction for traversing nodes. Will return the firstJsonTokenthat equivalent stream event would produce (for most nodes there is just one token but for structured/container types multiple)
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asText
public String asText(String defaultValue)
Description copied from class:JsonNodeMethod similar toJsonNode.asText(), except that it will returndefaultValuein 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.
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asText
public String asText()
Description copied from class:JsonNodeMethod that will return a valid String representation of the container value, if the node is a value node (methodJsonNode.isValueNode()returns true), otherwise empty String.
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requireNonNull
public JsonNode requireNonNull()
Description copied from class:JsonNodeMethod that may be called to verify thatthisnode is neither so-called "missing node" (that is, one for whichJsonNode.isMissingNode()returnstrue) nor "null node" (one for whichJsonNode.isNull()returnstrue). If non-null non-missing node,thisis returned to allow chaining; otherwiseIllegalArgumentExceptionis thrown.- Overrides:
requireNonNullin classJsonNode- Returns:
thisnode to allow chaining
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serialize
public final void serialize(com.fasterxml.jackson.core.JsonGenerator g, SerializerProvider provider) throws IOExceptionDescription copied from class:BaseJsonNodeMethod called to serialize node instances using given generator.- Specified by:
serializein interfaceJsonSerializable- Specified by:
serializein classBaseJsonNode- Throws:
IOException
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equals
public boolean equals(Object o)
Description copied from class:JsonNodeEquality 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.
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hashCode
public int hashCode()
- Specified by:
hashCodein classBaseJsonNode
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