com.fasterxml.jackson.databind.ser

Class ContainerSerializer<T>

java.lang.Object

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

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

com.fasterxml.jackson.databind.ser.ContainerSerializer<T>

All Implemented Interfaces:

JsonFormatVisitable, SchemaAware, java.io.Serializable

Direct Known Subclasses:

ArraySerializerBase, AsArraySerializerBase, MapEntrySerializer, MapSerializer

public abstract class ContainerSerializer<T>
extends StdSerializer<T>

Intermediate base class for serializers used for serializing types that contain element(s) of other types, such as arrays, Collections (Lists, Sets etc) and Maps and iterable things (Iterators).

See Also:

Serialized Form

Nested Class Summary

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

JsonSerializer.None

Method Summary

Modifier and Type	Method and Description
abstract JsonSerializer<?>	getContentSerializer() Accessor for serializer used for serializing contents (List and array elements, Map values etc) of the container for which this serializer is used, if it is known statically.
abstract JavaType	getContentType() Accessor for finding declared (static) element type for type this serializer is used for.
abstract boolean	hasSingleElement(T value) Method called to determine if the given value (of type handled by this serializer) contains exactly one element.
ContainerSerializer<?>	withValueTypeSerializer(TypeSerializer vts) Factory(-like) method that can be used to construct a new container serializer that uses specified TypeSerializer for decorating contained values with additional type information.

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

acceptJsonFormatVisitor, getSchema, getSchema, handledType, serialize, wrapAndThrow, wrapAndThrow

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

getDelegatee, isEmpty, isEmpty, isUnwrappingSerializer, properties, replaceDelegatee, serializeWithType, unwrappingSerializer, usesObjectId, withFilterId

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

withValueTypeSerializer

public ContainerSerializer<?> withValueTypeSerializer(TypeSerializer vts)

Factory(-like) method that can be used to construct a new container serializer that uses specified TypeSerializer for decorating contained values with additional type information.

Parameters:

vts - Type serializer to use for contained values; can be null, in which case 'this' serializer is returned as is

Returns:

Serializer instance that uses given type serializer for values if that is possible (or if not, just 'this' serializer)

getContentType

public abstract JavaType getContentType()

Accessor for finding declared (static) element type for type this serializer is used for.

getContentSerializer

public abstract JsonSerializer<?> getContentSerializer()

Accessor for serializer used for serializing contents (List and array elements, Map values etc) of the container for which this serializer is used, if it is known statically. Note that for dynamic types this may return null; if so, caller has to instead use getContentType() and SerializerProvider.findContentValueSerializer(com.fasterxml.jackson.databind.JavaType, com.fasterxml.jackson.databind.BeanProperty).

hasSingleElement

public abstract boolean hasSingleElement(T value)

Method called to determine if the given value (of type handled by this serializer) contains exactly one element.

Note: although it might seem sensible to instead define something like "getElementCount()" method, this would not work well for containers that do not keep track of size (like linked lists may not).

Note, too, that as of now (2.9) this method is only called by serializer itself; and specifically is not used for non-array/collection types like Map or Map.Entry instances.