BeanPropertyWriter (jackson-databind 2.2.0 API)

java.lang.Object
- com.fasterxml.jackson.databind.ser.BeanPropertyWriter

All Implemented Interfaces:

BeanProperty, Named

Direct Known Subclasses:

UnwrappingBeanPropertyWriter
```
public class BeanPropertyWriter
extends Object
implements BeanProperty
```
Base bean property handler class, which implements common parts of reflection-based functionality for accessing a property value and serializing it.
Note that current design tries to keep instances immutable (semi-functional style); mostly because these instances are exposed to application code and this is to reduce likelihood of data corruption and synchronization issues.

Nested Class Summary
- Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.BeanProperty
  BeanProperty.Std

Field Summary

Fields
Modifier and Type	Field and Description
`protected Method`	`_accessorMethod` Accessor method used to get property value, for method-accessible properties.
`protected JavaType`	`_cfgSerializationType` Type to use for locating serializer; normally same as return type of the accessor method, but may be overridden by annotations.
`protected Annotations`	`_contextAnnotations` Annotations from context (most often, class that declares property, or in case of sub-class serializer, from that sub-class)
`protected JavaType`	`_declaredType` Type property is declared to have, either in class definition or associated annotations.
`protected PropertySerializerMap`	`_dynamicSerializers` In case serializer is not known statically (i.e.
`protected Field`	`_field` Field that contains the property value for field-accessible properties.
`protected Class<?>[]`	`_includeInViews` Alternate set of property writers used when view-based filtering is available for the Bean.
`protected HashMap<Object,Object>`	`_internalSettings`
`protected boolean`	`_isRequired` Whether value of this property has been marked as required.
`protected AnnotatedMember`	`_member` Member (field, method) that represents property and allows access to associated annotations.
`protected SerializedString`	`_name` Logical name of the property; will be used as the field name under which value for the property is written.
`protected JavaType`	`_nonTrivialBaseType` Base type of the property, if the declared type is "non-trivial"; meaning it is either a structured type (collection, map, array), or parameterized.
`protected JsonSerializer<Object>`	`_nullSerializer` Serializer used for writing out null values, if any: if null, null values are to be suppressed.
`protected JsonSerializer<Object>`	`_serializer` Serializer to use for writing out the value: null if it can not be known statically; non-null if it can.
`protected Object`	`_suppressableValue` Value that is considered default value of the property; used for default-value-suppression if enabled.
`protected boolean`	`_suppressNulls` Whether null values are to be suppressed (nothing written out if value is null) or not.
`protected TypeSerializer`	`_typeSerializer` If property being serialized needs type information to be included this is the type serializer to use.
`protected PropertyName`	`_wrapperName` Wrapper name to use for this element, if any
`static Object`	`MARKER_FOR_EMPTY` Marker object used to indicate "do not serialize if empty"

Constructor Summary

Constructors
Modifier	Constructor and Description
	`BeanPropertyWriter(BeanPropertyDefinition propDef, AnnotatedMember member, Annotations contextAnnotations, JavaType declaredType, JsonSerializer<?> ser, TypeSerializer typeSer, JavaType serType, boolean suppressNulls, Object suppressableValue)`
`protected`	`BeanPropertyWriter(BeanPropertyWriter base)` "Copy constructor" to be used by filtering sub-classes
`protected`	`BeanPropertyWriter(BeanPropertyWriter base, SerializedString name)`

Method Summary

Methods
Modifier and Type	Method and Description
`protected JsonSerializer<Object>`	`_findAndAddDynamic(PropertySerializerMap map, Class<?> type, SerializerProvider provider)`
`protected void`	`_handleSelfReference(Object bean, JsonSerializer<?> ser)`
`void`	`assignNullSerializer(JsonSerializer<Object> nullSer)` Method called to assign null value serializer for property
`void`	`assignSerializer(JsonSerializer<Object> ser)` Method called to assign value serializer for property
`void`	`depositSchemaProperty(JsonObjectFormatVisitor objectVisitor)` Method that can be called to visit the type structure that this property is part of.
`void`	`depositSchemaProperty(ObjectNode propertiesNode, SerializerProvider provider)` Attempt to add the output of the given `BeanPropertyWriter` in the given `ObjectNode`.
`Object`	`get(Object bean)` Method that can be used to access value of the property this Object describes, from given bean instance.
`<A extends Annotation> A`	`getAnnotation(Class<A> acls)` Method for finding annotation associated with this property; meaning annotation associated with one of entities used to access property.
`<A extends Annotation> A`	`getContextAnnotation(Class<A> acls)` Method for finding annotation associated with context of this property; usually class in which member is declared (or its subtype if processing subtype).
`Type`	`getGenericPropertyType()` Get the generic property type of this property writer.
`Object`	`getInternalSetting(Object key)` Method for accessing value of specified internal setting.
`AnnotatedMember`	`getMember()` Method for accessing primary physical entity that represents the property; annotated field, method or constructor property.
`String`	`getName()` Method to get logical name of the property
`Class<?>`	`getPropertyType()`
`Class<?>`	`getRawSerializationType()`
`JavaType`	`getSerializationType()`
`SerializedString`	`getSerializedName()`
`JsonSerializer<Object>`	`getSerializer()`
`JavaType`	`getType()` Method to get declared type of the property.
`Class<?>[]`	`getViews()`
`PropertyName`	`getWrapperName()` If property is indicated to be wrapped, name of wrapper element to use.
`boolean`	`hasNullSerializer()`
`boolean`	`hasSerializer()`
`boolean`	`isRequired()` Whether value for property is marked as required using annotations or associated schema.
`protected boolean`	`isRequired(AnnotationIntrospector intr)` Deprecated. since 2.2, use `isRequired()` instead.
`Object`	`removeInternalSetting(Object key)` Method for removing entry for specified internal setting.
`BeanPropertyWriter`	`rename(NameTransformer transformer)`
`void`	`serializeAsColumn(Object bean, JsonGenerator jgen, SerializerProvider prov)` Alternative to `serializeAsField(java.lang.Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)` that is used when a POJO is serialized as JSON Array; the difference is that no field names are written.
`void`	`serializeAsField(Object bean, JsonGenerator jgen, SerializerProvider prov)` Method called to access property that this bean stands for, from within given bean, and to serialize it as a JSON Object field using appropriate serializer.
`void`	`serializeAsPlaceholder(Object bean, JsonGenerator jgen, SerializerProvider prov)` Method called to serialize a placeholder used in tabular output when real value is not to be included (is filtered out), but when we need an entry so that field indexes will not be off.
`Object`	`setInternalSetting(Object key, Object value)` Method for setting specific internal setting to given value
`void`	`setNonTrivialBaseType(JavaType t)` Method called to define type to consider as "non-trivial" basetype, needed for dynamic serialization resolution for complex (usually container) types
`String`	`toString()`
`BeanPropertyWriter`	`unwrappingWriter(NameTransformer unwrapper)` Method called create an instance that handles details of unwrapping contained value.
`boolean`	`willSuppressNulls()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - MARKER_FOR_EMPTY
```
public static final Object MARKER_FOR_EMPTY
```
    Marker object used to indicate "do not serialize if empty"
  - _member
```
protected final AnnotatedMember _member
```
    Member (field, method) that represents property and allows access to associated annotations.
  - _contextAnnotations
```
protected final Annotations _contextAnnotations
```
    Annotations from context (most often, class that declares property, or in case of sub-class serializer, from that sub-class)
  - _declaredType
```
protected final JavaType _declaredType
```
    Type property is declared to have, either in class definition or associated annotations.
  - _accessorMethod
```
protected final Method _accessorMethod
```
    Accessor method used to get property value, for method-accessible properties. Null if and only if _field is null.
  - _field
```
protected final Field _field
```
    Field that contains the property value for field-accessible properties. Null if and only if _accessorMethod is null.
  - _internalSettings
```
protected HashMap<Object,Object> _internalSettings
```
  - _name
```
protected final SerializedString _name
```
    Logical name of the property; will be used as the field name under which value for the property is written.
  - _wrapperName
```
protected final PropertyName _wrapperName
```
    Wrapper name to use for this element, if any
    
    Since:
    
    2.2
  - _cfgSerializationType
```
protected final JavaType _cfgSerializationType
```
    Type to use for locating serializer; normally same as return type of the accessor method, but may be overridden by annotations.
  - _serializer
```
protected JsonSerializer<Object> _serializer
```
    Serializer to use for writing out the value: null if it can not be known statically; non-null if it can.
  - _nullSerializer
```
protected JsonSerializer<Object> _nullSerializer
```
    Serializer used for writing out null values, if any: if null, null values are to be suppressed.
  - _dynamicSerializers
```
protected PropertySerializerMap _dynamicSerializers
```
    In case serializer is not known statically (i.e. _serializer is null), we will use a lookup structure for storing dynamically resolved mapping from type(s) to serializer(s).
  - _suppressNulls
```
protected final boolean _suppressNulls
```
    Whether null values are to be suppressed (nothing written out if value is null) or not.
  - _suppressableValue
```
protected final Object _suppressableValue
```
    Value that is considered default value of the property; used for default-value-suppression if enabled.
  - _includeInViews
```
protected final Class<?>[] _includeInViews
```
    Alternate set of property writers used when view-based filtering is available for the Bean.
  - _typeSerializer
```
protected TypeSerializer _typeSerializer
```
    If property being serialized needs type information to be included this is the type serializer to use. Declared type (possibly augmented with annotations) of property is used for determining exact mechanism to use (compared to actual runtime type used for serializing actual state).
  - _nonTrivialBaseType
```
protected JavaType _nonTrivialBaseType
```
    Base type of the property, if the declared type is "non-trivial"; meaning it is either a structured type (collection, map, array), or parameterized. Used to retain type information about contained type, which is mostly necessary if type meta-data is to be included.
  - _isRequired
```
protected final boolean _isRequired
```
    Whether value of this property has been marked as required. Retained since it will be needed when traversing type hierarchy for producing schemas (and other similar tasks); currently not used for serialization.
    
    Since:
    
    2.2
- Constructor Detail
  - BeanPropertyWriter
```
public BeanPropertyWriter(BeanPropertyDefinition propDef,
                  AnnotatedMember member,
                  Annotations contextAnnotations,
                  JavaType declaredType,
                  JsonSerializer<?> ser,
                  TypeSerializer typeSer,
                  JavaType serType,
                  boolean suppressNulls,
                  Object suppressableValue)
```
  - BeanPropertyWriter
```
protected BeanPropertyWriter(BeanPropertyWriter base)
```
    "Copy constructor" to be used by filtering sub-classes
  - BeanPropertyWriter
```
protected BeanPropertyWriter(BeanPropertyWriter base,
                  SerializedString name)
```
- Method Detail
  - rename
```
public BeanPropertyWriter rename(NameTransformer transformer)
```
  - assignSerializer
```
public void assignSerializer(JsonSerializer<Object> ser)
```
    Method called to assign value serializer for property
    
    Since:
    
    2.0
  - assignNullSerializer
```
public void assignNullSerializer(JsonSerializer<Object> nullSer)
```
    Method called to assign null value serializer for property
    
    Since:
    
    2.0
  - unwrappingWriter
```
public BeanPropertyWriter unwrappingWriter(NameTransformer unwrapper)
```
    Method called create an instance that handles details of unwrapping contained value.
  - setNonTrivialBaseType
```
public void setNonTrivialBaseType(JavaType t)
```
    Method called to define type to consider as "non-trivial" basetype, needed for dynamic serialization resolution for complex (usually container) types
  - getName
```
public String getName()
```
    Description copied from interface: BeanProperty
    
    Method to get logical name of the property
    
    Specified by:
    
    getName in interface BeanProperty
    
    Specified by:
    
    getName in interface Named
  - getType
```
public JavaType getType()
```
    Description copied from interface: BeanProperty
    
    Method to get declared type of the property.
    
    Specified by:
    
    getType in interface BeanProperty
  - getWrapperName
```
public PropertyName getWrapperName()
```
    Description copied from interface: BeanProperty
    
    If property is indicated to be wrapped, name of wrapper element to use.
    
    Specified by:
    
    getWrapperName in interface BeanProperty
  - isRequired
```
public boolean isRequired()
```
    Description copied from interface: BeanProperty
    
    Whether value for property is marked as required using annotations or associated schema.
    
    Specified by:
    
    isRequired in interface BeanProperty
  - getAnnotation
```
public <A extends Annotation> A getAnnotation(Class<A> acls)
```
    Description copied from interface: BeanProperty
    
    Method for finding annotation associated with this property; meaning annotation associated with one of entities used to access property.
    
    Specified by:
    
    getAnnotation in interface BeanProperty
  - getContextAnnotation
```
public <A extends Annotation> A getContextAnnotation(Class<A> acls)
```
    Description copied from interface: BeanProperty
    
    Method for finding annotation associated with context of this property; usually class in which member is declared (or its subtype if processing subtype).
    
    Specified by:
    
    getContextAnnotation in interface BeanProperty
  - getMember
```
public AnnotatedMember getMember()
```
    Description copied from interface: BeanProperty
    
    Method for accessing primary physical entity that represents the property; annotated field, method or constructor property.
    
    Specified by:
    
    getMember in interface BeanProperty
  - depositSchemaProperty
```
public void depositSchemaProperty(JsonObjectFormatVisitor objectVisitor)
                           throws JsonMappingException
```
    Description copied from interface: BeanProperty
    
    Method that can be called to visit the type structure that this property is part of. Note that not all implementations support traversal with this method; those that do not should throw UnsupportedOperationException.
    
    Specified by:
    
    depositSchemaProperty in interface BeanProperty
    
    Parameters:
    objectVisitor - Visitor to used as the callback handler
    
    Throws:
    
    JsonMappingException
  - getInternalSetting
```
public Object getInternalSetting(Object key)
```
    Method for accessing value of specified internal setting.
    
    Returns:
    Value of the setting, if any; null if none.
  - setInternalSetting
```
public Object setInternalSetting(Object key,
                        Object value)
```
    Method for setting specific internal setting to given value
    
    Returns:
    Old value of the setting, if any (null if none)
  - removeInternalSetting
```
public Object removeInternalSetting(Object key)
```
    Method for removing entry for specified internal setting.
    
    Returns:
    Existing value of the setting, if any (null if none)
  - getSerializedName
```
public SerializedString getSerializedName()
```
  - hasSerializer
```
public boolean hasSerializer()
```
  - hasNullSerializer
```
public boolean hasNullSerializer()
```
  - willSuppressNulls
```
public boolean willSuppressNulls()
```
  - getSerializer
```
public JsonSerializer<Object> getSerializer()
```
  - getSerializationType
```
public JavaType getSerializationType()
```
  - getRawSerializationType
```
public Class<?> getRawSerializationType()
```
  - getPropertyType
```
public Class<?> getPropertyType()
```
  - getGenericPropertyType
```
public Type getGenericPropertyType()
```
    Get the generic property type of this property writer.
    
    Returns:
    The property type, or null if not found.
  - getViews
```
public Class<?>[] getViews()
```
  - isRequired
```
@Deprecated
protected boolean isRequired(AnnotationIntrospector intr)
```
    Deprecated. since 2.2, use isRequired() instead.
    
    NOTE: due to introspection, this is a slow method to call and should never be called during actual serialization or filtering of the property. Rather it is needed for traversal needed for things like constructing JSON Schema instances.
    
    Since:
    
    2.1
  - depositSchemaProperty
```
public void depositSchemaProperty(ObjectNode propertiesNode,
                         SerializerProvider provider)
                           throws JsonMappingException
```
    Attempt to add the output of the given BeanPropertyWriter in the given ObjectNode. Otherwise, add the default schema JsonNode in place of the writer's output
    
    Parameters:
    propertiesNode - Node which the given property would exist within
    provider - Provider that can be used for accessing dynamic aspects of serialization processing BeanPropertyFilter.depositSchemaProperty(BeanPropertyWriter, ObjectNode, SerializerProvider)
    
    Throws:
    
    JsonMappingException
    Since:
    
    2.1
  - serializeAsField
```
public void serializeAsField(Object bean,
                    JsonGenerator jgen,
                    SerializerProvider prov)
                      throws Exception
```
    Method called to access property that this bean stands for, from within given bean, and to serialize it as a JSON Object field using appropriate serializer.
    
    Throws:
    
    Exception
  - serializeAsColumn
```
public void serializeAsColumn(Object bean,
                     JsonGenerator jgen,
                     SerializerProvider prov)
                       throws Exception
```
    Alternative to serializeAsField(java.lang.Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider) that is used when a POJO is serialized as JSON Array; the difference is that no field names are written.
    
    Throws:
    
    Exception
    Since:
    
    2.1
  - serializeAsPlaceholder
```
public void serializeAsPlaceholder(Object bean,
                          JsonGenerator jgen,
                          SerializerProvider prov)
                            throws Exception
```
    Method called to serialize a placeholder used in tabular output when real value is not to be included (is filtered out), but when we need an entry so that field indexes will not be off. Typically this should output null or empty String, depending on datatype.
    
    Throws:
    
    Exception
    Since:
    
    2.1
  - _findAndAddDynamic
```
protected JsonSerializer<Object> _findAndAddDynamic(PropertySerializerMap map,
                                        Class<?> type,
                                        SerializerProvider provider)
                                             throws JsonMappingException
```
    Throws:
    
    JsonMappingException
  - get
```
public final Object get(Object bean)
                 throws Exception
```
    Method that can be used to access value of the property this Object describes, from given bean instance.
    Note: method is final as it should not need to be overridden -- rather, calling method(s) (serializeAsField(java.lang.Object, com.fasterxml.jackson.core.JsonGenerator, com.fasterxml.jackson.databind.SerializerProvider)) should be overridden to change the behavior
    
    Throws:
    
    Exception
  - _handleSelfReference
```
protected void _handleSelfReference(Object bean,
                        JsonSerializer<?> ser)
                             throws JsonMappingException
```
    Throws:
    
    JsonMappingException
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class BeanPropertyWriter

Nested Class Summary

Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.BeanProperty

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MARKER_FOR_EMPTY

_member

_contextAnnotations

_declaredType

_accessorMethod

_field

_internalSettings

_name

_wrapperName

_cfgSerializationType

_serializer

_nullSerializer

_dynamicSerializers

_suppressNulls

_suppressableValue

_includeInViews

_typeSerializer

_nonTrivialBaseType

_isRequired

Constructor Detail

BeanPropertyWriter

BeanPropertyWriter

BeanPropertyWriter

Method Detail

rename

assignSerializer

assignNullSerializer

unwrappingWriter

setNonTrivialBaseType

getName

getType

getWrapperName

isRequired

getAnnotation

getContextAnnotation

getMember

depositSchemaProperty

getInternalSetting

setInternalSetting

removeInternalSetting

getSerializedName

hasSerializer

hasNullSerializer

willSuppressNulls

getSerializer

getSerializationType

getRawSerializationType

getPropertyType

getGenericPropertyType

getViews

isRequired

depositSchemaProperty

serializeAsField

serializeAsColumn

serializeAsPlaceholder

_findAndAddDynamic

get

_handleSelfReference

toString