Package com.fasterxml.jackson.databind.ser.impl

Class BeanAsArraySerializer

java.lang.Object
com.fasterxml.jackson.databind.JsonSerializer<Object>
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:

  • Constructor Details

  • Method Details

    • 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

    • 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

    • toString

      public String toString()
      Overrides:
      toString in class Object