com.fasterxml.jackson.databind.ser.impl

Class BeanAsArraySerializer

java.lang.Object

com.fasterxml.jackson.databind.JsonSerializer<T>

com.fasterxml.jackson.databind.ser.std.StdSerializer<Object>

com.fasterxml.jackson.databind.ser.std.BeanSerializerBase

com.fasterxml.jackson.databind.ser.impl.BeanAsArraySerializer

All Implemented Interfaces:

JsonFormatVisitable, SchemaAware, ContextualSerializer, ResolvableSerializer, Serializable

public class BeanAsArraySerializer
extends BeanSerializerBase

Specialized POJO serializer that differs from BeanSerializer in that instead of producing a JSON Object it will output a JSON Array, omitting field names, and serializing values in specified serialization order. This behavior is usually triggered by using annotation JsonFormat or its equivalents.

This serializer can be used for "simple" instances; and will NOT be used if one of following is true:

• Unwrapping is used (no way to expand out array in JSON Object)
• Type information ("type id") is to be used: while this could work for some embedding methods, it would likely cause conflicts.
• Object Identity ("object id") is used: while references would work, the problem is inclusion of id itself.

Note that it is theoretically possible that last 2 issues could be addressed (by reserving room in array, for example); and if so, support improved.

In cases where array-based output is not feasible, this serializer can instead delegate to the original Object-based serializer; this is why a reference is retained to the original serializer.

Since:

2.1

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonSerializer

JsonSerializer.None

Field Summary

Fields

Modifier and Type	Field and Description
protected BeanSerializerBase	_defaultSerializer Serializer that would produce JSON Object version; used in cases where array output cannot be used.

Fields inherited from class com.fasterxml.jackson.databind.ser.std.BeanSerializerBase

_anyGetterWriter, _beanType, _filteredProps, _objectIdWriter, _propertyFilterId, _props, _serializationShape, _typeId, NAME_FOR_OBJECT_REF, NO_PROPS

Fields inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

_handledType

Constructor Summary

Constructors

Modifier	Constructor and Description
	BeanAsArraySerializer(BeanSerializerBase src)
protected	BeanAsArraySerializer(BeanSerializerBase src, ObjectIdWriter oiw, Object filterId)
protected	BeanAsArraySerializer(BeanSerializerBase src, Set<String> toIgnore)

Method Summary

Modifier and Type	Method and Description
protected BeanSerializerBase	asArraySerializer() Mutant factory for creating a variant that output POJO as a JSON Array.
boolean	isUnwrappingSerializer() Accessor for checking whether this serializer is an "unwrapping" serializer; this is necessary to know since it may also require caller to suppress writing of the leading property name.
void	serialize(Object bean, JsonGenerator gen, SerializerProvider provider) Main serialization method that will delegate actual output to configured BeanPropertyWriter instances.
protected void	serializeAsArray(Object bean, JsonGenerator gen, SerializerProvider provider)
void	serializeWithType(Object bean, JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.
String	toString()
JsonSerializer<Object>	unwrappingSerializer(NameTransformer transformer) Method that will return serializer instance that produces "unwrapped" serialization, if applicable for type being serialized (which is the case for some serializers that produce JSON Objects as output).
BeanSerializerBase	withFilterId(Object filterId) Mutant factory used for creating a new instance with different filter id (used with JsonFilter annotation)
protected BeanAsArraySerializer	withIgnorals(Set<String> toIgnore) Mutant factory used for creating a new instance with additional set of properties to ignore (from properties this instance otherwise has)
BeanSerializerBase	withObjectIdWriter(ObjectIdWriter objectIdWriter) Mutant factory used for creating a new instance with different ObjectIdWriter.

Methods inherited from class com.fasterxml.jackson.databind.ser.std.BeanSerializerBase

_customTypeId, _serializeObjectId, _serializeWithObjectId, _serializeWithObjectId, _typeIdDef, acceptJsonFormatVisitor, createContextual, findConvertingSerializer, getSchema, properties, resolve, serializeFields, serializeFieldsFiltered, usesObjectId, withIgnorals

Methods inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

_neitherNull, _nonEmpty, createSchemaNode, createSchemaNode, findAnnotatedContentSerializer, findContextualConvertingSerializer, findConvertingContentSerializer, findFormatFeature, findFormatOverrides, findIncludeOverrides, findPropertyFilter, getSchema, handledType, isDefaultSerializer, visitArrayFormat, visitArrayFormat, visitFloatFormat, visitIntFormat, visitIntFormat, visitStringFormat, visitStringFormat, wrapAndThrow, wrapAndThrow

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

getDelegatee, isEmpty, isEmpty, replaceDelegatee

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.fasterxml.jackson.databind.jsonschema.SchemaAware

getSchema

Field Detail

_defaultSerializer

protected final BeanSerializerBase _defaultSerializer

Serializer that would produce JSON Object version; used in cases where array output cannot be used.

Constructor Detail

BeanAsArraySerializer

public BeanAsArraySerializer(BeanSerializerBase src)

BeanAsArraySerializer

protected BeanAsArraySerializer(BeanSerializerBase src,
                                Set<String> toIgnore)

BeanAsArraySerializer

protected BeanAsArraySerializer(BeanSerializerBase src,
                                ObjectIdWriter oiw,
                                Object filterId)

Method Detail

unwrappingSerializer

public JsonSerializer<Object> unwrappingSerializer(NameTransformer transformer)

Description copied from class: JsonSerializer

Method that will return serializer instance that produces "unwrapped" serialization, if applicable for type being serialized (which is the case for some serializers that produce JSON Objects as output). If no unwrapped serializer can be constructed, will simply return serializer as-is.

Default implementation just returns serializer as-is, indicating that no unwrapped variant exists

Overrides:

unwrappingSerializer in class JsonSerializer<Object>

Parameters:

transformer - Name transformation to use to convert between names of unwrapper properties

isUnwrappingSerializer

public boolean isUnwrappingSerializer()

Description copied from class: JsonSerializer

Accessor for checking whether this serializer is an "unwrapping" serializer; this is necessary to know since it may also require caller to suppress writing of the leading property name.

Overrides:

isUnwrappingSerializer in class JsonSerializer<Object>

withObjectIdWriter

public BeanSerializerBase withObjectIdWriter(ObjectIdWriter objectIdWriter)

Description copied from class: BeanSerializerBase

Mutant factory used for creating a new instance with different ObjectIdWriter.

Specified by:

withObjectIdWriter in class BeanSerializerBase

withFilterId

public BeanSerializerBase withFilterId(Object filterId)

Description copied from class: BeanSerializerBase

Mutant factory used for creating a new instance with different filter id (used with JsonFilter annotation)

Specified by:

withFilterId in class BeanSerializerBase

withIgnorals

protected BeanAsArraySerializer withIgnorals(Set<String> toIgnore)

Description copied from class: BeanSerializerBase

Mutant factory used for creating a new instance with additional set of properties to ignore (from properties this instance otherwise has)

Specified by:

withIgnorals in class BeanSerializerBase

asArraySerializer

protected BeanSerializerBase asArraySerializer()

Description copied from class: BeanSerializerBase

Mutant factory for creating a variant that output POJO as a JSON Array. Implementations may ignore this request if output as array is not possible (either at all, or reliably).

Specified by:

asArraySerializer in class BeanSerializerBase

serializeWithType

public void serializeWithType(Object bean,
                              JsonGenerator gen,
                              SerializerProvider provider,
                              TypeSerializer typeSer)
                       throws IOException

Description copied from class: JsonSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.

Default implementation will throw UnsupportedOperationException to indicate that proper type handling needs to be implemented.

For simple datatypes written as a single scalar value (JSON String, Number, Boolean), implementation would look like:

  // note: method to call depends on whether this type is serialized as JSON scalar, object or Array!
  typeSer.writeTypePrefixForScalar(value, gen);
  serialize(value, gen, provider);
  typeSer.writeTypeSuffixForScalar(value, gen);

and implementations for type serialized as JSON Arrays or Objects would differ slightly, as START-ARRAY/END-ARRAY and START-OBJECT/END-OBJECT pairs need to be properly handled with respect to serializing of contents.

Overrides:

serializeWithType in class BeanSerializerBase

Parameters:

bean - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

provider - Provider that can be used to get serializers for serializing Objects value contains, if any.

typeSer - Type serializer to use for including type information

Throws:

IOException

serialize

public final void serialize(Object bean,
                            JsonGenerator gen,
                            SerializerProvider provider)
                     throws IOException

Main serialization method that will delegate actual output to configured BeanPropertyWriter instances.

Specified by:

serialize in class BeanSerializerBase

Parameters:

bean - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

provider - Provider that can be used to get serializers for serializing Objects value contains, if any.

Throws:

IOException

serializeAsArray

protected final void serializeAsArray(Object bean,
                                      JsonGenerator gen,
                                      SerializerProvider provider)
                               throws IOException

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object