com.fasterxml.jackson.databind.deser

Class BeanDeserializerBase

java.lang.Object

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

com.fasterxml.jackson.databind.deser.std.StdDeserializer<java.lang.Object>

com.fasterxml.jackson.databind.deser.BeanDeserializerBase

All Implemented Interfaces:

ContextualDeserializer, NullValueProvider, ResolvableDeserializer, ValueInstantiator.Gettable, java.io.Serializable

Direct Known Subclasses:

BeanAsArrayBuilderDeserializer, BeanAsArrayDeserializer, BeanDeserializer, BuilderBasedDeserializer

public abstract class BeanDeserializerBase
extends StdDeserializer<java.lang.Object>
implements ContextualDeserializer, ResolvableDeserializer, ValueInstantiator.Gettable, java.io.Serializable

Base class for BeanDeserializer.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonDeserializer

JsonDeserializer.None

Constructor Summary

Constructors

Constructor and Description
BeanDeserializerBase(BeanDeserializerBase src, ObjectIdReader oir)
BeanDeserializerBase(BeanDeserializerBase src, java.util.Set<java.lang.String> ignorableProps)

Method Summary

Modifier and Type	Method and Description
JsonDeserializer<?>	createContextual(DeserializationContext ctxt, BeanProperty property) Although most of post-processing is done in resolve(), we only get access to referring property's annotations here; and this is needed to support per-property ObjectIds.
java.util.Iterator<SettableBeanProperty>	creatorProperties() Accessor for finding properties that represents values to pass through property-based creator method (constructor or factory method)
java.lang.Object	deserializeFromArray(JsonParser p, DeserializationContext ctxt)
java.lang.Object	deserializeFromBoolean(JsonParser p, DeserializationContext ctxt) Method called to deserialize POJO value from a JSON boolean value (true, false)
java.lang.Object	deserializeFromDouble(JsonParser p, DeserializationContext ctxt) Method called to deserialize POJO value from a JSON floating-point number.
java.lang.Object	deserializeFromEmbedded(JsonParser p, DeserializationContext ctxt)
java.lang.Object	deserializeFromNumber(JsonParser p, DeserializationContext ctxt)
abstract java.lang.Object	deserializeFromObject(JsonParser p, DeserializationContext ctxt) General version used when handling needs more advanced features.
java.lang.Object	deserializeFromString(JsonParser p, DeserializationContext ctxt)
java.lang.Object	deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) Base implementation that does not assume specific type inclusion mechanism.
SettableBeanProperty	findBackReference(java.lang.String logicalName) Method needed by BeanDeserializerFactory to properly link managed- and back-reference pairs.
SettableBeanProperty	findProperty(int propertyIndex) Alternate find method that tries to locate a property with given property index.
SettableBeanProperty	findProperty(PropertyName propertyName)
SettableBeanProperty	findProperty(java.lang.String propertyName) Accessor for finding the property with given name, if POJO has one.
java.lang.Class<?>	getBeanClass() Deprecated. Since 2.3, use handledType() instead
AccessPattern	getEmptyAccessPattern() This method may be called in conjunction with calls to JsonDeserializer.getEmptyValue(DeserializationContext), to check whether it needs to be called just once (static values), or each time empty value is needed.
java.lang.Object	getEmptyValue(DeserializationContext ctxt) Method called to determine value to be used for "empty" values (most commonly when deserializing from empty JSON Strings).
java.util.Collection<java.lang.Object>	getKnownPropertyNames() Method that will either return null to indicate that type being deserializers has no concept of properties; or a collection of identifiers for which toString will give external property name.
AccessPattern	getNullAccessPattern() Default implementation indicates that "null value" to use for input null is simply Java `null` for all deserializers, unless overridden by sub-classes.
ObjectIdReader	getObjectIdReader() Overridden to return true for those instances that are handling value for which Object Identity handling is enabled (either via value type or referring property).
int	getPropertyCount() Accessor for checking number of deserialized properties.
ValueInstantiator	getValueInstantiator()
JavaType	getValueType() Exact structured type this deserializer handles, if known.
java.lang.Class<?>	handledType() Method for accessing type of values this deserializer produces.
boolean	hasProperty(java.lang.String propertyName)
boolean	hasViews()
boolean	isCachable() Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).
java.util.Iterator<SettableBeanProperty>	properties() Accessor for iterating over properties this deserializer uses; with the exception that properties passed via Creator methods (specifically, "property-based constructor") are not included, but can be accessed separate by calling creatorProperties()
void	replaceProperty(SettableBeanProperty original, SettableBeanProperty replacement) Method that can be used to replace an existing property with a modified one.
void	resolve(DeserializationContext ctxt) Method called to finalize setup of this deserializer, after deserializer itself has been registered.
java.lang.Boolean	supportsUpdate(DeserializationConfig config) Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not.
abstract JsonDeserializer<java.lang.Object>	unwrappingDeserializer(NameTransformer unwrapper) Method that will return deserializer instance that is able to handle "unwrapped" value instances If no unwrapped instance can be constructed, will simply return this object as-is.
BeanDeserializerBase	withBeanProperties(BeanPropertyMap props) Mutant factory method that custom sub-classes must override; not left as abstract to prevent more drastic backwards compatibility problems.
abstract BeanDeserializerBase	withIgnorableProperties(java.util.Set<java.lang.String> ignorableProps)
abstract BeanDeserializerBase	withObjectIdReader(ObjectIdReader oir)
void	wrapAndThrow(java.lang.Throwable t, java.lang.Object bean, java.lang.String fieldName, DeserializationContext ctxt) Method that will modify caught exception (passed in as argument) as necessary to include reference information, and to ensure it is a subtype of IOException, or an unchecked exception.

Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

getValueClass

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

deserialize, deserialize, getDelegatee, getEmptyValue, getNullValue, getNullValue, replaceDelegatee

Methods inherited from class java.lang.Object

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

Constructor Detail

BeanDeserializerBase

public BeanDeserializerBase(BeanDeserializerBase src,
                            ObjectIdReader oir)

BeanDeserializerBase

public BeanDeserializerBase(BeanDeserializerBase src,
                            java.util.Set<java.lang.String> ignorableProps)

Method Detail

unwrappingDeserializer

public abstract JsonDeserializer<java.lang.Object> unwrappingDeserializer(NameTransformer unwrapper)

Description copied from class: JsonDeserializer

Method that will return deserializer instance that is able to handle "unwrapped" value instances If no unwrapped instance can be constructed, will simply return this object as-is.

Default implementation just returns 'this' indicating that no unwrapped variant exists

Overrides:

unwrappingDeserializer in class JsonDeserializer<java.lang.Object>

withObjectIdReader

public abstract BeanDeserializerBase withObjectIdReader(ObjectIdReader oir)

withIgnorableProperties

public abstract BeanDeserializerBase withIgnorableProperties(java.util.Set<java.lang.String> ignorableProps)

withBeanProperties

public BeanDeserializerBase withBeanProperties(BeanPropertyMap props)

Mutant factory method that custom sub-classes must override; not left as abstract to prevent more drastic backwards compatibility problems.

Since:

2.8

resolve

public void resolve(DeserializationContext ctxt)
             throws JsonMappingException

Method called to finalize setup of this deserializer, after deserializer itself has been registered. This is needed to handle recursive and transitive dependencies.

Specified by:

resolve in interface ResolvableDeserializer

Parameters:

ctxt - Context to use for accessing configuration, resolving secondary deserializers

Throws:

JsonMappingException

createContextual

public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
                                            BeanProperty property)
                                     throws JsonMappingException

Although most of post-processing is done in resolve(), we only get access to referring property's annotations here; and this is needed to support per-property ObjectIds. We will also consider Shape transformations (read from Array) at this point, since it may come from either Class definition or property.

Specified by:

createContextual in interface ContextualDeserializer

Parameters:

ctxt - Deserialization context to access configuration, additional deserializers that may be needed by this deserializer

property - Method, field or constructor parameter that represents the property (and is used to assign deserialized value). 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' deserializer as is)

Returns:

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

Throws:

JsonMappingException

getNullAccessPattern

public AccessPattern getNullAccessPattern()

Description copied from class: JsonDeserializer

Default implementation indicates that "null value" to use for input null is simply Java `null` for all deserializers, unless overridden by sub-classes. This information may be used as optimization.

Specified by:

getNullAccessPattern in interface NullValueProvider

Overrides:

getNullAccessPattern in class JsonDeserializer<java.lang.Object>

getEmptyAccessPattern

public AccessPattern getEmptyAccessPattern()

Description copied from class: JsonDeserializer

This method may be called in conjunction with calls to JsonDeserializer.getEmptyValue(DeserializationContext), to check whether it needs to be called just once (static values), or each time empty value is needed.

Overrides:

getEmptyAccessPattern in class JsonDeserializer<java.lang.Object>

getEmptyValue

public java.lang.Object getEmptyValue(DeserializationContext ctxt)
                               throws JsonMappingException

Description copied from class: JsonDeserializer

Method called to determine value to be used for "empty" values (most commonly when deserializing from empty JSON Strings). Usually this is same as JsonDeserializer.getNullValue(com.fasterxml.jackson.databind.DeserializationContext) (which in turn is usually simply Java null), but it can be overridden for types. Or, if type should never be converted from empty String, method can also throw an exception.

Since version 2.6 (in which the context argument was added), call is expected to be made each and every time an empty value is needed.

Since version 2.9 does not require return of `T` any more.

Default implementation simply calls JsonDeserializer.getNullValue(com.fasterxml.jackson.databind.DeserializationContext) and returns value.

Overrides:

getEmptyValue in class JsonDeserializer<java.lang.Object>

Throws:

JsonMappingException

isCachable

public boolean isCachable()

Description copied from class: JsonDeserializer

Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).

Note that cached instances are still resolved on per-property basis, if instance implements ResolvableDeserializer: cached instance is just as the base. This means that in most cases it is safe to cache instances; however, it only makes sense to cache instances if instantiation is expensive, or if instances are heavy-weight.

Default implementation returns false, to indicate that no caching is done.

Overrides:

isCachable in class JsonDeserializer<java.lang.Object>

supportsUpdate

public java.lang.Boolean supportsUpdate(DeserializationConfig config)

Description copied from class: JsonDeserializer

Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not. Return value should either be Boolean.FALSE if update is not supported at all (immutable values); Boolean.TRUE if update should usually work (regular POJOs, for example), or null if this is either not known, or may sometimes work.

Information gathered is typically used to either prevent merging update for property (either by skipping, if based on global defaults; or by exception during deserialization construction if explicit attempt made) if Boolean.FALSE returned, or inclusion if Boolean.TRUE is specified. If "unknown" case (null returned) behavior is to exclude property if global defaults used; or to allow if explicit per-type or property merging is defined.

Default implementation returns null to allow explicit per-type or per-property attempts.

Overrides:

supportsUpdate in class JsonDeserializer<java.lang.Object>

handledType

public java.lang.Class<?> handledType()

Description copied from class: JsonDeserializer

Method for accessing type of values this deserializer produces. Note that this information is not guaranteed to be exact -- it may be a more generic (super-type) -- but it should not be incorrect (return a non-related type).

Default implementation will return null, which means almost same same as returning Object.class would; that is, that nothing is known about handled type.

Overrides:

handledType in class StdDeserializer<java.lang.Object>

getObjectIdReader

public ObjectIdReader getObjectIdReader()

Overridden to return true for those instances that are handling value for which Object Identity handling is enabled (either via value type or referring property).

Overrides:

getObjectIdReader in class JsonDeserializer<java.lang.Object>

Returns:

ObjectIdReader used for resolving possible Object Identifier value, instead of full value serialization, if deserializer can do that; null if no Object Id is expected.

hasProperty

public boolean hasProperty(java.lang.String propertyName)

hasViews

public boolean hasViews()

getPropertyCount

public int getPropertyCount()

Accessor for checking number of deserialized properties.

getKnownPropertyNames

public java.util.Collection<java.lang.Object> getKnownPropertyNames()

Description copied from class: JsonDeserializer

Method that will either return null to indicate that type being deserializers has no concept of properties; or a collection of identifiers for which toString will give external property name. This is only to be used for error reporting and diagnostics purposes (most commonly, to accompany "unknown property" exception).

Overrides:

getKnownPropertyNames in class JsonDeserializer<java.lang.Object>

getBeanClass

@Deprecated
public final java.lang.Class<?> getBeanClass()

Deprecated. Since 2.3, use handledType() instead

getValueType

public JavaType getValueType()

Description copied from class: StdDeserializer

Exact structured type this deserializer handles, if known.

Default implementation just returns null.

Overrides:

getValueType in class StdDeserializer<java.lang.Object>

properties

public java.util.Iterator<SettableBeanProperty> properties()

Accessor for iterating over properties this deserializer uses; with the exception that properties passed via Creator methods (specifically, "property-based constructor") are not included, but can be accessed separate by calling creatorProperties()

creatorProperties

public java.util.Iterator<SettableBeanProperty> creatorProperties()

Accessor for finding properties that represents values to pass through property-based creator method (constructor or factory method)

Since:

2.0

findProperty

public SettableBeanProperty findProperty(PropertyName propertyName)

findProperty

public SettableBeanProperty findProperty(java.lang.String propertyName)

Accessor for finding the property with given name, if POJO has one. Name used is the external name, i.e. name used in external data representation (JSON).

Since:

2.0

findProperty

public SettableBeanProperty findProperty(int propertyIndex)

Alternate find method that tries to locate a property with given property index. Note that access by index is not necessarily faster than by name, since properties are not directly indexable; however, for most instances difference is not significant as number of properties is low.

Since:

2.3

findBackReference

public SettableBeanProperty findBackReference(java.lang.String logicalName)

Method needed by BeanDeserializerFactory to properly link managed- and back-reference pairs.

Overrides:

findBackReference in class JsonDeserializer<java.lang.Object>

getValueInstantiator

public ValueInstantiator getValueInstantiator()

Specified by:

getValueInstantiator in interface ValueInstantiator.Gettable

replaceProperty

public void replaceProperty(SettableBeanProperty original,
                            SettableBeanProperty replacement)

Method that can be used to replace an existing property with a modified one.

NOTE: only ever use this method if you know what you are doing; incorrect usage can break deserializer.

Parameters:

original - Property to replace

replacement - Property to replace it with

Since:

2.1

deserializeFromObject

public abstract java.lang.Object deserializeFromObject(JsonParser p,
                                                       DeserializationContext ctxt)
                                                throws java.io.IOException

General version used when handling needs more advanced features.

Throws:

java.io.IOException

deserializeWithType

public java.lang.Object deserializeWithType(JsonParser p,
                                            DeserializationContext ctxt,
                                            TypeDeserializer typeDeserializer)
                                     throws java.io.IOException

Description copied from class: StdDeserializer

Base implementation that does not assume specific type inclusion mechanism. Sub-classes are expected to override this method if they are to handle type information.

Overrides:

deserializeWithType in class StdDeserializer<java.lang.Object>

typeDeserializer - Deserializer to use for handling type information

Throws:

java.io.IOException

deserializeFromNumber

public java.lang.Object deserializeFromNumber(JsonParser p,
                                              DeserializationContext ctxt)
                                       throws java.io.IOException

Throws:

java.io.IOException

deserializeFromString

public java.lang.Object deserializeFromString(JsonParser p,
                                              DeserializationContext ctxt)
                                       throws java.io.IOException

Throws:

java.io.IOException

deserializeFromDouble

public java.lang.Object deserializeFromDouble(JsonParser p,
                                              DeserializationContext ctxt)
                                       throws java.io.IOException

Method called to deserialize POJO value from a JSON floating-point number.

Throws:

java.io.IOException

deserializeFromBoolean

public java.lang.Object deserializeFromBoolean(JsonParser p,
                                               DeserializationContext ctxt)
                                        throws java.io.IOException

Method called to deserialize POJO value from a JSON boolean value (true, false)

Throws:

java.io.IOException

deserializeFromArray

public java.lang.Object deserializeFromArray(JsonParser p,
                                             DeserializationContext ctxt)
                                      throws java.io.IOException

Throws:

java.io.IOException

deserializeFromEmbedded

public java.lang.Object deserializeFromEmbedded(JsonParser p,
                                                DeserializationContext ctxt)
                                         throws java.io.IOException

Throws:

java.io.IOException

wrapAndThrow

public void wrapAndThrow(java.lang.Throwable t,
                         java.lang.Object bean,
                         java.lang.String fieldName,
                         DeserializationContext ctxt)
                  throws java.io.IOException

Method that will modify caught exception (passed in as argument) as necessary to include reference information, and to ensure it is a subtype of IOException, or an unchecked exception.

Rules for wrapping and unwrapping are bit complicated; essentially:

• Errors are to be passed as is (if uncovered via unwrapping)
• "Plain" IOExceptions (ones that are not of type JsonMappingException are to be passed as is

Throws:

java.io.IOException