Package org.codehaus.jackson.node
Class NullNode
- java.lang.Object
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- org.codehaus.jackson.JsonNode
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- org.codehaus.jackson.node.BaseJsonNode
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- org.codehaus.jackson.node.ValueNode
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- org.codehaus.jackson.node.NullNode
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- All Implemented Interfaces:
java.lang.Iterable<JsonNode>
,JsonSerializable
,JsonSerializableWithType
public final class NullNode extends ValueNode
This singleton value class is used to contain explicit JSON null value.
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Field Summary
Fields Modifier and Type Field Description static NullNode
instance
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Fields inherited from class org.codehaus.jackson.JsonNode
NO_NODES, NO_STRINGS
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.java.lang.String
asText()
Method that will return valid String representation of the container value, if the node is a value node (methodJsonNode.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(java.lang.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
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Methods inherited from class org.codehaus.jackson.node.BaseJsonNode
findParent, findParents, findPath, findValue, findValues, findValuesAsText, getNumberType, traverse
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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
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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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getInstance
public static NullNode getInstance()
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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 firstJsonToken
that equivalent stream event would produce (for most nodes there is just one token but for structured/container types multiple)
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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.
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asText
public java.lang.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 (methodJsonNode.isValueNode()
returns true), otherwise empty String.
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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.
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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.
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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.
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serialize
public final void serialize(JsonGenerator jg, SerializerProvider provider) throws java.io.IOException, JsonProcessingException
Description copied from class:BaseJsonNode
Method called to serialize node instances using given generator.- Specified by:
serialize
in interfaceJsonSerializable
- Specified by:
serialize
in classBaseJsonNode
- Throws:
java.io.IOException
JsonProcessingException
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equals
public boolean equals(java.lang.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
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