Class StdDelegatingSerializer
- java.lang.Object
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- com.fasterxml.jackson.databind.JsonSerializer<T>
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- com.fasterxml.jackson.databind.ser.std.StdSerializer<Object>
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- com.fasterxml.jackson.databind.ser.std.StdDelegatingSerializer
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- All Implemented Interfaces:
JsonFormatVisitable,SchemaAware,ContextualSerializer,ResolvableSerializer,Serializable
public class StdDelegatingSerializer extends StdSerializer<Object> implements ContextualSerializer, ResolvableSerializer, JsonFormatVisitable, SchemaAware
Serializer implementation where given Java type is first converted to an intermediate "delegate type" (using a configuredConverter, and then this delegate value is serialized by Jackson.Note that although types may be related, they must not be same; trying to do this will result in an exception.
- Since:
- 2.1
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonSerializer
JsonSerializer.None
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Field Summary
Fields Modifier and Type Field Description protected Converter<Object,?>_converterprotected JsonSerializer<Object>_delegateSerializerUnderlying serializer for typeT.protected JavaType_delegateTypeFully resolved delegate type, with generic information if any available.-
Fields inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer
_handledType
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Constructor Summary
Constructors Constructor Description StdDelegatingSerializer(Converter<?,?> converter)StdDelegatingSerializer(Converter<Object,?> converter, JavaType delegateType, JsonSerializer<?> delegateSerializer)StdDelegatingSerializer(Class<T> cls, Converter<T,?> converter)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected JsonSerializer<Object>_findSerializer(Object value, SerializerProvider serializers)Helper method used for locating serializer to use in dynamic use case, where actual type value gets converted to is not specified beyond basicObject, and where serializer needs to be located dynamically based on actual value type.voidacceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)Default implementation specifies no format.protected ObjectconvertValue(Object value)Method called to convert from source Java value into delegate value (which will be serialized using standard Jackson serializer for delegate type)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.protected Converter<Object,?>getConverter()JsonSerializer<?>getDelegatee()Accessor that can be used to determine if this serializer uses another serializer for actual serialization, by delegating calls.JsonNodegetSchema(SerializerProvider provider, Type typeHint)Default implementation simply claims type is "string"; usually overriden by custom serializers.JsonNodegetSchema(SerializerProvider provider, Type typeHint, boolean isOptional)Default implementation simply claims type is "string"; usually overriden by custom serializers.booleanisEmpty(SerializerProvider prov, Object value)Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).voidresolve(SerializerProvider provider)Method called afterSerializerProviderhas registered the serializer, but before it has returned it to the caller.voidserialize(Object value, com.fasterxml.jackson.core.JsonGenerator gen, SerializerProvider provider)Method that can be called to ask implementation to serialize values of type this serializer handles.voidserializeWithType(Object value, com.fasterxml.jackson.core.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.protected StdDelegatingSerializerwithDelegate(Converter<Object,?> converter, JavaType delegateType, JsonSerializer<?> delegateSerializer)Method used for creating resolved contextual instances.-
Methods inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer
_neitherNull, _nonEmpty, createSchemaNode, createSchemaNode, findAnnotatedContentSerializer, findContextualConvertingSerializer, findConvertingContentSerializer, findFormatFeature, findFormatOverrides, findIncludeOverrides, findPropertyFilter, handledType, isDefaultSerializer, visitArrayFormat, visitArrayFormat, visitFloatFormat, visitIntFormat, visitIntFormat, visitStringFormat, visitStringFormat, wrapAndThrow, wrapAndThrow
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Methods inherited from class com.fasterxml.jackson.databind.JsonSerializer
isEmpty, isUnwrappingSerializer, properties, replaceDelegatee, unwrappingSerializer, usesObjectId, withFilterId
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Field Detail
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_delegateType
protected final JavaType _delegateType
Fully resolved delegate type, with generic information if any available.
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_delegateSerializer
protected final JsonSerializer<Object> _delegateSerializer
Underlying serializer for typeT.
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Constructor Detail
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StdDelegatingSerializer
public StdDelegatingSerializer(Converter<?,?> converter)
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StdDelegatingSerializer
public StdDelegatingSerializer(Converter<Object,?> converter, JavaType delegateType, JsonSerializer<?> delegateSerializer)
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Method Detail
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withDelegate
protected StdDelegatingSerializer withDelegate(Converter<Object,?> converter, JavaType delegateType, JsonSerializer<?> delegateSerializer)
Method used for creating resolved contextual instances. Must be overridden when sub-classing.
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resolve
public void resolve(SerializerProvider provider) throws JsonMappingException
Description copied from interface:ResolvableSerializerMethod called afterSerializerProviderhas registered the serializer, but before it has returned it to the caller. Called object can then resolve its dependencies to other types, including self-references (direct or indirect).Note that this method does NOT return serializer, since resolution is not allowed to change actual serializer to use.
- Specified by:
resolvein interfaceResolvableSerializer- Parameters:
provider- Provider that has constructed serializer this method is called on.- Throws:
JsonMappingException
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createContextual
public JsonSerializer<?> createContextual(SerializerProvider provider, BeanProperty property) throws JsonMappingException
Description copied from interface:ContextualSerializerMethod 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:
createContextualin interfaceContextualSerializer- Parameters:
provider- Serializer provider to use for accessing config, other serializersproperty- 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
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getDelegatee
public JsonSerializer<?> getDelegatee()
Description copied from class:JsonSerializerAccessor that can be used to determine if this serializer uses another serializer for actual serialization, by delegating calls. If so, will return immediate delegate (which itself may delegate to further serializers); otherwise will return null.- Overrides:
getDelegateein classJsonSerializer<Object>- Returns:
- Serializer this serializer delegates calls to, if null; null otherwise.
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serialize
public void serialize(Object value, com.fasterxml.jackson.core.JsonGenerator gen, SerializerProvider provider) throws IOException
Description copied from class:JsonSerializerMethod that can be called to ask implementation to serialize values of type this serializer handles.- Specified by:
serializein classStdSerializer<Object>- Parameters:
value- Value to serialize; can not be null.gen- Generator used to output resulting Json contentprovider- Provider that can be used to get serializers for serializing Objects value contains, if any.- Throws:
IOException
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serializeWithType
public void serializeWithType(Object value, com.fasterxml.jackson.core.JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) throws IOException
Description copied from class:JsonSerializerMethod 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
UnsupportedOperationExceptionto 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, asSTART-ARRAY/END-ARRAYandSTART-OBJECT/END-OBJECTpairs need to be properly handled with respect to serializing of contents.- Overrides:
serializeWithTypein classJsonSerializer<Object>- Parameters:
value- Value to serialize; can not be null.gen- Generator used to output resulting Json contentprovider- 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
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isEmpty
public boolean isEmpty(SerializerProvider prov, Object value)
Description copied from class:JsonSerializerMethod 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:
isEmptyin classJsonSerializer<Object>
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getSchema
public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException
Description copied from class:StdSerializerDefault implementation simply claims type is "string"; usually overriden by custom serializers.- Specified by:
getSchemain interfaceSchemaAware- Overrides:
getSchemain classStdSerializer<Object>- Parameters:
provider- The serializer provider.typeHint- A hint about the type.- Returns:
- Json-schema for this serializer.
- Throws:
JsonMappingException
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getSchema
public JsonNode getSchema(SerializerProvider provider, Type typeHint, boolean isOptional) throws JsonMappingException
Description copied from class:StdSerializerDefault implementation simply claims type is "string"; usually overriden by custom serializers.- Specified by:
getSchemain interfaceSchemaAware- Overrides:
getSchemain classStdSerializer<Object>- Parameters:
provider- The serializer provider.typeHint- A hint about the type.isOptional- Is the type optional- Returns:
- Json-schema for this serializer.
- Throws:
JsonMappingException
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acceptJsonFormatVisitor
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException
Description copied from class:StdSerializerDefault implementation specifies no format. This behavior is usually overriden by custom serializers.- Specified by:
acceptJsonFormatVisitorin interfaceJsonFormatVisitable- Overrides:
acceptJsonFormatVisitorin classStdSerializer<Object>typeHint- Type of element (entity like property) being visited- Throws:
JsonMappingException
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convertValue
protected Object convertValue(Object value)
Method called to convert from source Java value into delegate value (which will be serialized using standard Jackson serializer for delegate type)The default implementation uses configured
Converterto do conversion.- Parameters:
value- Value to convert- Returns:
- Result of conversion
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_findSerializer
protected JsonSerializer<Object> _findSerializer(Object value, SerializerProvider serializers) throws JsonMappingException
Helper method used for locating serializer to use in dynamic use case, where actual type value gets converted to is not specified beyond basicObject, and where serializer needs to be located dynamically based on actual value type.- Throws:
JsonMappingException- Since:
- 2.6
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