Package com.fasterxml.jackson.databind.ser.std

Class MapSerializer

    • Field Detail

      • MARKER_FOR_EMPTY

        public static final java.lang.Object MARKER_FOR_EMPTY
        Since:
        2.9

    • Method Detail

      • withFilterId

        public MapSerializer withFilterId​(java.lang.Object filterId)
        Description copied from class: JsonSerializer
        Mutant factory method that is called if contextual configuration indicates that a specific filter (as specified by filterId) is to be used for serialization.

        Default implementation simply returns this; sub-classes that do support filtering will need to create and return new instance if filter changes.

        Overrides:
        withFilterId in class JsonSerializer<java.util.Map<?,​?>>

      • withContentInclusion

        public MapSerializer withContentInclusion​(java.lang.Object suppressableValue,
                                          boolean suppressNulls)
        Mutant factory for constructing an instance with different inclusion strategy for content (Map values).
        Since:
        2.9

      • construct

        public static MapSerializer construct​(java.util.Set<java.lang.String> ignoredEntries,
                                      java.util.Set<java.lang.String> includedEntries,
                                      JavaType mapType,
                                      boolean staticValueType,
                                      TypeSerializer vts,
                                      JsonSerializer<java.lang.Object> keySerializer,
                                      JsonSerializer<java.lang.Object> valueSerializer,
                                      java.lang.Object filterId)
        Since:
        2.12

      • withContentInclusion

        @Deprecated
public MapSerializer withContentInclusion​(java.lang.Object suppressableValue)
        Deprecated.
        since 2.9

      • construct

        @Deprecated
public static MapSerializer construct​(java.lang.String[] ignoredList,
                                      JavaType mapType,
                                      boolean staticValueType,
                                      TypeSerializer vts,
                                      JsonSerializer<java.lang.Object> keySerializer,
                                      JsonSerializer<java.lang.Object> valueSerializer,
                                      java.lang.Object filterId)
        Deprecated.
        Since 2.8 use the other overload
        Since:
        2.3

      • 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

      • isEmpty

        public boolean isEmpty​(SerializerProvider prov,
                       java.util.Map<?,​?> value)
        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<?,​?>>

      • hasSingleElement

        public boolean hasSingleElement​(java.util.Map<?,​?> 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<?,​?>>

      • serialize

        public void serialize​(java.util.Map<?,​?> 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<?,​?>>
        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<?,​?> value,
                              JsonGenerator gen,
                              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<?,​?>>
        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.
        typeSer - Type serializer to use for including type information
        Throws:
        java.io.IOException

      • serializeWithoutTypeInfo

        public void serializeWithoutTypeInfo​(java.util.Map<?,​?> value,
                                     JsonGenerator gen,
                                     SerializerProvider provider)
                              throws java.io.IOException
        General-purpose serialization for contents without writing object type. Will suppress, filter and use custom serializers.

        Public since it also is called by AnyGetterWriter.

        Throws:
        java.io.IOException
        Since:
        2.11

      • serializeFields

        public void serializeFields​(java.util.Map<?,​?> value,
                            JsonGenerator gen,
                            SerializerProvider provider)
                     throws java.io.IOException
        General-purpose serialization for contents, where we do not necessarily know the value serialization, but we do know that no value suppression is needed (which simplifies processing a bit)
        Throws:
        java.io.IOException

      • serializeOptionalFields

        public void serializeOptionalFields​(java.util.Map<?,​?> value,
                                    JsonGenerator gen,
                                    SerializerProvider provider,
                                    java.lang.Object suppressableValue)
                             throws java.io.IOException
        Serialization method called when exclusion filtering needs to be applied.
        Throws:
        java.io.IOException

      • serializeFieldsUsing

        public void serializeFieldsUsing​(java.util.Map<?,​?> value,
                                 JsonGenerator gen,
                                 SerializerProvider provider,
                                 JsonSerializer<java.lang.Object> ser)
                          throws java.io.IOException
        Method called to serialize fields, when the value type is statically known, so that value serializer is passed and does not need to be fetched from provider.
        Throws:
        java.io.IOException

      • serializeFilteredFields

        public void serializeFilteredFields​(java.util.Map<?,​?> value,
                                    JsonGenerator gen,
                                    SerializerProvider provider,
                                    PropertyFilter filter,
                                    java.lang.Object suppressableValue)
                             throws java.io.IOException
        Helper method used when we have a JSON Filter to use for potentially filtering out Map entries.
        Throws:
        java.io.IOException
        Since:
        2.5

      • serializeTypedFields

        public void serializeTypedFields​(java.util.Map<?,​?> value,
                                 JsonGenerator gen,
                                 SerializerProvider provider,
                                 java.lang.Object suppressableValue)
                          throws java.io.IOException
        Throws:
        java.io.IOException
        Since:
        2.5

      • serializeFilteredAnyProperties

        public void serializeFilteredAnyProperties​(SerializerProvider provider,
                                           JsonGenerator gen,
                                           java.lang.Object bean,
                                           java.util.Map<?,​?> value,
                                           PropertyFilter filter,
                                           java.lang.Object suppressableValue)
                                    throws java.io.IOException
        Helper method used when we have a JSON Filter to use AND contents are "any properties" of a POJO.
        Parameters:
        bean - Enclosing POJO that has any-getter used to obtain "any properties"
        Throws:
        java.io.IOException
        Since:
        2.9

      • getSchema

        @Deprecated
public JsonNode getSchema​(SerializerProvider provider,
                          java.lang.reflect.Type typeHint)
        Deprecated.
        Since 2.15
        Description copied from class: StdSerializer
        Default implementation simply claims type is "string"; usually overriden by custom serializers.
        Specified by:
        getSchema in interface SchemaAware
        Overrides:
        getSchema in class StdSerializer<java.util.Map<?,​?>>
        Parameters:
        provider - The serializer provider.
        typeHint - A hint about the type.
        Returns:
        Json-schema for this serializer.