BaseJsonNode (jackson-databind 2.12.0 API)

java.lang.Object
- com.fasterxml.jackson.databind.JsonSerializable.Base
- - com.fasterxml.jackson.databind.JsonNode
  - - com.fasterxml.jackson.databind.node.BaseJsonNode

All Implemented Interfaces:

TreeNode, JsonSerializable, Serializable, Iterable<JsonNode>

Direct Known Subclasses:

ContainerNode, ValueNode
```
public abstract class BaseJsonNode
extends JsonNode
implements Serializable
```
Abstract base class common to all standard JsonNode implementations. The main addition here is that we declare that sub-classes must implement JsonSerializable. This simplifies object mapping aspects a bit, as no external serializers are needed.
Since 2.10, all implements have been Serializable.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.JsonSerializable
  JsonSerializable.Base

Constructor Summary

Constructors
Modifier Constructor and Description

protected BaseJsonNode()

Constructors
Modifier	Constructor and Description
`protected`	`BaseJsonNode()`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`abstract JsonToken`	`asToken()` Method that can be used for efficient type detection when using stream abstraction for traversing nodes.
`JsonNode`	`findPath(String fieldName)` Method similar to `JsonNode.findValue(java.lang.String)`, but that will return a "missing node" instead of null if no field is found.
`abstract int`	`hashCode()`
`JsonParser.NumberType`	`numberType()` Returns code that identifies type of underlying numeric value, if (and only if) node is a number node.
`JsonNode`	`required(int index)` Method is functionally equivalent to `path(index).required()` and can be used to check that this node is an `ArrayNode` (that is, represents JSON Array value) and has value for specified `index` (but note that value may be explicit JSON null value).
`JsonNode`	`required(String fieldName)` Method is functionally equivalent to `path(fieldName).required()` and can be used to check that this node is an `ObjectNode` (that is, represents JSON Object value) and has value for specified property with key `fieldName` (but note that value may be explicit JSON null value).
`abstract void`	`serialize(JsonGenerator jgen, SerializerProvider provider)` Method called to serialize node instances using given generator.
`abstract void`	`serializeWithType(JsonGenerator jgen, SerializerProvider provider, TypeSerializer typeSer)` Type information is needed, even if JsonNode instances are "plain" JSON, since they may be mixed with other types.
`String`	`toPrettyString()` Alternative to `JsonNode.toString()` that will serialize this node using Jackson default pretty-printer.
`String`	`toString()` Method that will produce (as of Jackson 2.10) valid JSON using default settings of databind, as String.
`JsonParser`	`traverse()`
`JsonParser`	`traverse(ObjectCodec codec)`

Methods inherited from class com.fasterxml.jackson.databind.JsonNode
_at, _reportRequiredViolation, _this, asBoolean, asBoolean, asDouble, asDouble, asInt, asInt, asLong, asLong, asText, asText, at, at, bigIntegerValue, binaryValue, booleanValue, canConvertToExactIntegral, canConvertToInt, canConvertToLong, decimalValue, deepCopy, doubleValue, elements, equals, equals, fieldNames, fields, findParent, findParents, findParents, findValue, findValues, findValues, findValuesAsText, findValuesAsText, floatValue, get, get, getNodeType, has, has, hasNonNull, hasNonNull, intValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isEmpty, isFloat, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNull, isNumber, isObject, isPojo, isShort, isTextual, isValueNode, iterator, longValue, numberValue, path, path, require, requiredAt, requiredAt, requireNonNull, shortValue, size, textValue, with, withArray

Methods inherited from class com.fasterxml.jackson.databind.JsonSerializable.Base
isEmpty

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Constructor Detail
  - BaseJsonNode
```
protected BaseJsonNode()
```
- Method Detail
  - findPath
```
public final JsonNode findPath(String fieldName)
```
    Description copied from class: JsonNode
    
    Method similar to JsonNode.findValue(java.lang.String), but that will return a "missing node" instead of null if no field is found. Missing node is a specific kind of node for which JsonNode.isMissingNode() returns true; and all value access methods return empty or missing value.
    
    Specified by:
    
    findPath in class JsonNode
    
    Parameters:
    
    fieldName - Name of field to look for
    
    Returns:
    
    Value of first matching node found; or if not found, a "missing node" (non-null instance that has no value)
  - hashCode
```
public abstract int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - required
```
public JsonNode required(String fieldName)
```
    Description copied from class: JsonNode
    
    Method is functionally equivalent to path(fieldName).required() and can be used to check that this node is an ObjectNode (that is, represents JSON Object value) and has value for specified property with key fieldName (but note that value may be explicit JSON null value). If this node is Object Node and has value for specified property, this is returned to allow chaining; otherwise IllegalArgumentException is thrown.
    
    Overrides:
    
    required in class JsonNode
    
    Returns:
    
    this node to allow chaining
  - required
```
public JsonNode required(int index)
```
    Description copied from class: JsonNode
    
    Method is functionally equivalent to path(index).required() and can be used to check that this node is an ArrayNode (that is, represents JSON Array value) and has value for specified index (but note that value may be explicit JSON null value). If this node is Array Node and has value for specified index, this is returned to allow chaining; otherwise IllegalArgumentException is thrown.
    
    Overrides:
    
    required in class JsonNode
    
    Returns:
    
    this node to allow chaining
  - traverse
```
public JsonParser traverse()
```
    Specified by:
    
    traverse in interface TreeNode
  - traverse
```
public JsonParser traverse(ObjectCodec codec)
```
    Specified by:
    
    traverse in interface TreeNode
  - asToken
```
public abstract JsonToken asToken()
```
    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 interface TreeNode
  - numberType
```
public JsonParser.NumberType numberType()
```
    Returns code that identifies type of underlying numeric value, if (and only if) node is a number node.
    
    Specified by:
    
    numberType in interface TreeNode
  - serialize
```
public abstract void serialize(JsonGenerator jgen,
                               SerializerProvider provider)
                        throws IOException,
                               JsonProcessingException
```
    Method called to serialize node instances using given generator.
    
    Specified by:
    
    serialize in interface JsonSerializable
    
    Throws:
    
    IOException
    
    JsonProcessingException
  - serializeWithType
```
public abstract void serializeWithType(JsonGenerator jgen,
                                       SerializerProvider provider,
                                       TypeSerializer typeSer)
                                throws IOException,
                                       JsonProcessingException
```
    Type information is needed, even if JsonNode instances are "plain" JSON, since they may be mixed with other types.
    
    Specified by:
    
    serializeWithType in interface JsonSerializable
    
    Throws:
    
    IOException
    
    JsonProcessingException
  - toString
```
public String toString()
```
    Description copied from class: JsonNode
    Method that will produce (as of Jackson 2.10) valid JSON using default settings of databind, as String. If you want other kinds of JSON output (or output formatted using one of other Jackson-supported data formats) make sure to use 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.
    Specified by:
    
    toString in class JsonNode
  - toPrettyString
```
public String toPrettyString()
```
    Description copied from class: JsonNode
    
    Alternative to JsonNode.toString() that will serialize this node using Jackson default pretty-printer.
    
    Overrides:
    
    toPrettyString in class JsonNode

Class BaseJsonNode

Nested Class Summary

Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.JsonSerializable

Constructor Summary

Method Summary

Methods inherited from class com.fasterxml.jackson.databind.JsonNode

Methods inherited from class com.fasterxml.jackson.databind.JsonSerializable.Base

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.Iterable

Constructor Detail

BaseJsonNode

Method Detail

findPath

hashCode

required

required

traverse

traverse

asToken

numberType

serialize

serializeWithType

toString

toPrettyString