com.fasterxml.jackson.databind.node
Class BaseJsonNode

java.lang.Object
  com.fasterxml.jackson.databind.JsonNode
      com.fasterxml.jackson.databind.node.BaseJsonNode

All Implemented Interfaces:

TreeNode, JsonSerializable, Iterable<JsonNode>

Direct Known Subclasses:

ContainerNode, MissingNode, ValueNode

public abstract class BaseJsonNode
extends JsonNode
implements JsonSerializable

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.

Field Summary

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

NO_NODES, NO_STRINGS

Constructor Summary

protected

BaseJsonNode()

Method Summary

abstract JsonToken	asToken() Method that can be used for efficient type detection when using stream abstraction for traversing nodes.
ObjectNode	findParent(String fieldName) Method for finding a JSON Object that contains specified field, within this node or its descendants.
List<JsonNode>	findParents(String fieldName, List<JsonNode> foundSoFar)
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.
JsonNode	findValue(String fieldName) Method for finding a JSON Object field with specified name in this node or its child nodes, and returning value it has.
List<JsonNode>	findValues(String fieldName, List<JsonNode> foundSoFar)
List<String>	findValuesAsText(String fieldName, List<String> foundSoFar)
JsonParser.NumberType	numberType() Returns code that identifies type of underlying numeric value, if (and only if) node is a number node.
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.
JsonParser	traverse() Method for constructing a JsonParser instance for iterating over contents of the tree that this node is root of.

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

asBoolean, asBoolean, asDouble, asDouble, asInt, asInt, asLong, asLong, asText, bigIntegerValue, binaryValue, booleanValue, canConvertToInt, canConvertToLong, decimalValue, deepCopy, doubleValue, elements, equals, fieldNames, fields, findParents, findValues, findValuesAsText, get, get, has, has, hasNonNull, hasNonNull, intValue, isArray, isBigDecimal, isBigInteger, isBinary, isBoolean, isContainerNode, isDouble, isFloatingPointNumber, isInt, isIntegralNumber, isLong, isMissingNode, isNull, isNumber, isObject, isPojo, isTextual, isValueNode, iterator, longValue, numberValue, path, path, size, textValue, toString, with, withArray

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BaseJsonNode

protected BaseJsonNode()

Method Detail

findValue

public JsonNode findValue(String fieldName)

Description copied from class: JsonNode

Method for finding a JSON Object field with specified name in this node or its child nodes, and returning value it has. If no matching field is found in this node or its descendants, returns null.

Specified by:

findValue in class JsonNode

Parameters:

fieldName - Name of field to look for

Returns:

Value of first matching node found, if any; null if none

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)

findParent

public ObjectNode findParent(String fieldName)

Description copied from class: JsonNode

Method for finding a JSON Object that contains specified field, within this node or its descendants. If no matching field is found in this node or its descendants, returns null.

Specified by:

findParent in class JsonNode

Parameters:

fieldName - Name of field to look for

Returns:

Value of first matching node found, if any; null if none

findValues

public List<JsonNode> findValues(String fieldName,
                                 List<JsonNode> foundSoFar)

Specified by:

findValues in class JsonNode

findValuesAsText

public List<String> findValuesAsText(String fieldName,
                                     List<String> foundSoFar)

Specified by:

findValuesAsText in class JsonNode

findParents

public List<JsonNode> findParents(String fieldName,
                                  List<JsonNode> foundSoFar)

Specified by:

findParents in class JsonNode

traverse

public JsonParser traverse()

Description copied from class: JsonNode

Method for constructing a JsonParser instance for iterating over contents of the tree that this node is root of. Functionally equivalent to first serializing tree using ObjectCodec and then re-parsing but more efficient.

Specified by:

traverse in interface TreeNode

Specified by:

traverse in class JsonNode

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

Specified by:

asToken in class JsonNode

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

Specified by:

numberType in class JsonNode

Returns:

Type of number contained, if any; or null if node does not contain numeric value.

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