com.fasterxml.jackson.databind.ser.impl

Class MapEntrySerializer

java.lang.Object

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

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

com.fasterxml.jackson.databind.ser.ContainerSerializer<java.util.Map.Entry<?,?>>

com.fasterxml.jackson.databind.ser.impl.MapEntrySerializer

All Implemented Interfaces:

JsonFormatVisitable, SchemaAware, ContextualSerializer, java.io.Serializable

public class MapEntrySerializer
extends ContainerSerializer<java.util.Map.Entry<?,?>>
implements ContextualSerializer

Since:

2.5

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
static java.lang.Object	MARKER_FOR_EMPTY

Constructor Summary

Constructors

Constructor and Description
MapEntrySerializer(JavaType type, JavaType keyType, JavaType valueType, boolean staticTyping, TypeSerializer vts, BeanProperty property)

Method Summary

Modifier and Type	Method and Description
ContainerSerializer<?>	_withValueTypeSerializer(TypeSerializer vts) Method that needs to be implemented to allow construction of a new serializer object with given TypeSerializer, used when addition type information is to be embedded.
JsonSerializer<?>	createContextual(SerializerProvider provider, BeanProperty property) Method called to see if a different (or differently configured) serializer is needed to serialize values of specified property.
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.
JavaType	getContentType() Accessor for finding declared (static) element type for type this serializer is used for.
boolean	hasSingleElement(java.util.Map.Entry<?,?> value) Method called to determine if the given value (of type handled by this serializer) contains exactly one element.
boolean	isEmpty(SerializerProvider prov, java.util.Map.Entry<?,?> entry) Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).
void	serialize(java.util.Map.Entry<?,?> value, JsonGenerator gen, SerializerProvider provider) Method that can be called to ask implementation to serialize values of type this serializer handles.
void	serializeWithType(java.util.Map.Entry<?,?> value, JsonGenerator g, 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.
MapEntrySerializer	withContentInclusion(java.lang.Object suppressableValue, boolean suppressNulls)
MapEntrySerializer	withResolved(BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, java.lang.Object suppressableValue, boolean suppressNulls)

Methods inherited from class com.fasterxml.jackson.databind.ser.ContainerSerializer

withValueTypeSerializer

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

acceptJsonFormatVisitor, getSchema, getSchema, handledType, wrapAndThrow, wrapAndThrow

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

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

Methods inherited from class java.lang.Object

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

Field Detail

MARKER_FOR_EMPTY

public static final java.lang.Object MARKER_FOR_EMPTY

Since:

2.9

Constructor Detail

MapEntrySerializer

public MapEntrySerializer(JavaType type,
                          JavaType keyType,
                          JavaType valueType,
                          boolean staticTyping,
                          TypeSerializer vts,
                          BeanProperty property)

Method Detail

_withValueTypeSerializer

public ContainerSerializer<?> _withValueTypeSerializer(TypeSerializer vts)

Description copied from class: ContainerSerializer

Method that needs to be implemented to allow construction of a new serializer object with given TypeSerializer, used when addition type information is to be embedded.

withResolved

public MapEntrySerializer withResolved(BeanProperty property,
                                       JsonSerializer<?> keySerializer,
                                       JsonSerializer<?> valueSerializer,
                                       java.lang.Object suppressableValue,
                                       boolean suppressNulls)

Since:

2.9

withContentInclusion

public MapEntrySerializer withContentInclusion(java.lang.Object suppressableValue,
                                               boolean suppressNulls)

Since:

2.9

createContextual

public JsonSerializer<?> createContextual(SerializerProvider provider,
                                          BeanProperty property)
                                   throws JsonMappingException

Description copied from interface: ContextualSerializer

Method called to see if a different (or differently configured) serializer is needed to serialize values of specified property. Note that instance that this method is called on is typically shared one and as a result method should NOT modify this instance but rather construct and return a new instance. This instance should only be returned as-is, in case it is already suitable for use.

Specified by:

createContextual in interface ContextualSerializer

Parameters:

provider - Serializer provider to use for accessing config, other serializers

property - Method or field that represents the property (and is used to access value to serialize). Should be available; but there may be cases where caller cannot provide it and null is passed instead (in which case impls usually pass 'this' serializer as is)

Returns:

Serializer to use for serializing values of specified property; may be this instance or a new instance.

Throws:

JsonMappingException

getContentType

public JavaType getContentType()

Description copied from class: ContainerSerializer

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

Specified by:

getContentType in class ContainerSerializer<java.util.Map.Entry<?,?>>

getContentSerializer

public JsonSerializer<?> getContentSerializer()

Description copied from class: ContainerSerializer

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 ContainerSerializer.getContentType() and SerializerProvider.findContentValueSerializer(com.fasterxml.jackson.databind.JavaType, com.fasterxml.jackson.databind.BeanProperty).

Specified by:

getContentSerializer in class ContainerSerializer<java.util.Map.Entry<?,?>>

hasSingleElement

public boolean hasSingleElement(java.util.Map.Entry<?,?> value)

Description copied from class: ContainerSerializer

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.

Specified by:

hasSingleElement in class ContainerSerializer<java.util.Map.Entry<?,?>>

isEmpty

public boolean isEmpty(SerializerProvider prov,
                       java.util.Map.Entry<?,?> entry)

Description copied from class: JsonSerializer

Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).

Default implementation will consider only null values to be empty.

NOTE: replaces JsonSerializer.isEmpty(Object), which was deprecated in 2.5

Overrides:

isEmpty in class JsonSerializer<java.util.Map.Entry<?,?>>

serialize

public void serialize(java.util.Map.Entry<?,?> value,
                      JsonGenerator gen,
                      SerializerProvider provider)
               throws java.io.IOException

Description copied from class: JsonSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles.

Specified by:

serialize in class StdSerializer<java.util.Map.Entry<?,?>>

Parameters:

value - 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:

java.io.IOException

serializeWithType

public void serializeWithType(java.util.Map.Entry<?,?> value,
                              JsonGenerator g,
                              SerializerProvider provider,
                              TypeSerializer typeSer)
                       throws java.io.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 JsonSerializer<java.util.Map.Entry<?,?>>

Parameters:

value - Value to serialize; can not be null.

g - 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:

java.io.IOException