java.lang.Object
- org.codehaus.jackson.map.DeserializerProvider
- - org.codehaus.jackson.map.deser.StdDeserializerProvider

```
public class StdDeserializerProvider
extends DeserializerProvider
```
Default DeserializerProvider implementation. Handles low-level caching (non-root) aspects of deserializer handling; all construction details are delegated to configured DeserializerFactory instance that the provider owns.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`protected static class`	`StdDeserializerProvider.WrappedDeserializer`	Simple deserializer that will call configured type deserializer, passing in configured data deserializer, and exposing it all as a simple deserializer.

Field Summary

Fields
Modifier and Type	Field	Description
`protected ConcurrentHashMap<JavaType,JsonDeserializer<Object>>`	`_cachedDeserializers`	We will also cache some dynamically constructed deserializers; specifically, ones that are expensive to construct.
`protected DeserializerFactory`	`_factory`	Factory responsible for constructing actual deserializers, if not one of pre-configured types.
`protected HashMap<JavaType,JsonDeserializer<Object>>`	`_incompleteDeserializers`	During deserializer construction process we may need to keep track of partially completed deserializers, to resolve cyclic dependencies.
`protected RootNameLookup`	`_rootNames`

Constructor Summary

Constructors
Constructor Description

StdDeserializerProvider()
Default constructor.

StdDeserializerProvider(DeserializerFactory f)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected JsonDeserializer<Object>`	`_createAndCache2(DeserializationConfig config, JavaType type, BeanProperty property)`	Method that handles actual construction (via factory) and caching (both intermediate and eventual)
`protected JsonDeserializer<Object>`	`_createAndCacheValueDeserializer(DeserializationConfig config, JavaType type, BeanProperty property)`	Method that will try to create a deserializer for given type, and resolve and cache it if necessary
`protected JsonDeserializer<Object>`	`_createDeserializer(DeserializationConfig config, JavaType type, BeanProperty property)`
`protected JsonDeserializer<Object>`	`_findCachedDeserializer(JavaType type)`
`protected KeyDeserializer`	`_handleUnknownKeyDeserializer(JavaType type)`
`protected JsonDeserializer<Object>`	`_handleUnknownValueDeserializer(JavaType type)`
`protected void`	`_resolveDeserializer(DeserializationConfig config, ResolvableDeserializer ser)`
`int`	`cachedDeserializersCount()`	Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works).
`SerializedString`	`findExpectedRootName(DeserializationConfig config, JavaType type)`	Method that can be used to try find expected root name for given type
`KeyDeserializer`	`findKeyDeserializer(DeserializationConfig config, JavaType type, BeanProperty property)`	Method called to get hold of a deserializer to use for deserializing keys for `Map`.
`JsonDeserializer<Object>`	`findTypedValueDeserializer(DeserializationConfig config, JavaType type, BeanProperty property)`	Method called to locate deserializer for given type, as well as matching type deserializer (if one is needed); and if type deserializer is needed, construct a "wrapped" deserializer that can extract and use type information for calling actual deserializer.
`JsonDeserializer<Object>`	`findValueDeserializer(DeserializationConfig config, JavaType propertyType, BeanProperty property)`	Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked).
`void`	`flushCachedDeserializers()`	Method that will drop all dynamically constructed deserializers (ones that are counted as result value for `cachedDeserializersCount()`).
`boolean`	`hasValueDeserializerFor(DeserializationConfig config, JavaType type)`	Method that can be called to find out whether a deserializer can be found for given type
`JavaType`	`mapAbstractType(DeserializationConfig config, JavaType type)`	Method that can be called to try to resolve an abstract type (interface, abstract class) into a concrete type, or at least something "more concrete" (abstract class instead of interface).
`DeserializerProvider`	`withAbstractTypeResolver(AbstractTypeResolver resolver)`
`DeserializerProvider`	`withAdditionalDeserializers(Deserializers d)`	Method that is to configure `DeserializerFactory` that provider has to use specified deserializer provider, with highest precedence (that is, additional providers have higher precedence than default one or previously added ones)
`DeserializerProvider`	`withAdditionalKeyDeserializers(KeyDeserializers d)`
`DeserializerProvider`	`withDeserializerModifier(BeanDeserializerModifier modifier)`
`StdDeserializerProvider`	`withFactory(DeserializerFactory factory)`	Method that sub-classes need to override, to ensure that fluent-factory methods will produce proper sub-type.
`DeserializerProvider`	`withValueInstantiators(ValueInstantiators instantiators)`	Method that will construct a new instance with specified additional value instantiators (i.e.

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

- Field Detail
  - _cachedDeserializers
```
protected final ConcurrentHashMap<JavaType,JsonDeserializer<Object>> _cachedDeserializers
```
    We will also cache some dynamically constructed deserializers; specifically, ones that are expensive to construct. This currently means bean and Enum deserializers; array, List and Map deserializers will not be cached.
    Given that we don't expect much concurrency for additions (should very quickly converge to zero after startup), let's explicitly define a low concurrency setting.
  - _incompleteDeserializers
```
protected final HashMap<JavaType,JsonDeserializer<Object>> _incompleteDeserializers
```
    During deserializer construction process we may need to keep track of partially completed deserializers, to resolve cyclic dependencies. This is the map used for storing deserializers before they are fully complete.
  - _rootNames
```
protected final RootNameLookup _rootNames
```
  - _factory
```
protected DeserializerFactory _factory
```
    Factory responsible for constructing actual deserializers, if not one of pre-configured types.
- Constructor Detail
  - StdDeserializerProvider
```
public StdDeserializerProvider()
```
    Default constructor. Equivalent to calling
    new StdDeserializerProvider(BeanDeserializerFactory.instance);
  - StdDeserializerProvider
```
public StdDeserializerProvider(DeserializerFactory f)
```
- Method Detail
  - withAdditionalDeserializers
```
public DeserializerProvider withAdditionalDeserializers(Deserializers d)
```
    Description copied from class: DeserializerProvider
    
    Method that is to configure DeserializerFactory that provider has to use specified deserializer provider, with highest precedence (that is, additional providers have higher precedence than default one or previously added ones)
    
    Specified by:
    
    withAdditionalDeserializers in class DeserializerProvider
  - withAdditionalKeyDeserializers
```
public DeserializerProvider withAdditionalKeyDeserializers(KeyDeserializers d)
```
    Specified by:
    
    withAdditionalKeyDeserializers in class DeserializerProvider
  - withDeserializerModifier
```
public DeserializerProvider withDeserializerModifier(BeanDeserializerModifier modifier)
```
    Specified by:
    
    withDeserializerModifier in class DeserializerProvider
  - withAbstractTypeResolver
```
public DeserializerProvider withAbstractTypeResolver(AbstractTypeResolver resolver)
```
    Specified by:
    
    withAbstractTypeResolver in class DeserializerProvider
  - withValueInstantiators
```
public DeserializerProvider withValueInstantiators(ValueInstantiators instantiators)
```
    Description copied from class: DeserializerProvider
    
    Method that will construct a new instance with specified additional value instantiators (i.e. does NOT replace existing ones)
    
    Specified by:
    
    withValueInstantiators in class DeserializerProvider
  - withFactory
```
public StdDeserializerProvider withFactory(DeserializerFactory factory)
```
    Description copied from class: DeserializerProvider
    
    Method that sub-classes need to override, to ensure that fluent-factory methods will produce proper sub-type.
    
    Specified by:
    
    withFactory in class DeserializerProvider
  - mapAbstractType
```
public JavaType mapAbstractType(DeserializationConfig config,
                                JavaType type)
                         throws JsonMappingException
```
    Description copied from class: DeserializerProvider
    
    Method that can be called to try to resolve an abstract type (interface, abstract class) into a concrete type, or at least something "more concrete" (abstract class instead of interface). Will either return passed type, or a more specific type.
    
    Specified by:
    
    mapAbstractType in class DeserializerProvider
    
    Throws:
    
    JsonMappingException
  - findExpectedRootName
```
public SerializedString findExpectedRootName(DeserializationConfig config,
                                             JavaType type)
                                      throws JsonMappingException
```
    Description copied from class: DeserializerProvider
    
    Method that can be used to try find expected root name for given type
    
    Specified by:
    
    findExpectedRootName in class DeserializerProvider
    
    Throws:
    
    JsonMappingException
  - findValueDeserializer
```
public JsonDeserializer<Object> findValueDeserializer(DeserializationConfig config,
                                                      JavaType propertyType,
                                                      BeanProperty property)
                                               throws JsonMappingException
```
    Description copied from class: DeserializerProvider
    
    Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked).
    Note: this method is only called for value types; not for keys. Key deserializers can be accessed using DeserializerProvider.findKeyDeserializer(org.codehaus.jackson.map.DeserializationConfig, org.codehaus.jackson.type.JavaType, org.codehaus.jackson.map.BeanProperty).
    
    Specified by:
    
    findValueDeserializer in class DeserializerProvider
    
    Parameters:
    
    config - Deserialization configuration
    
    propertyType - Declared type of the value to deserializer (obtained using 'setter' method signature and/or type annotations
    
    property - Object that represents accessor for property value; field, setter method or constructor parameter.
    
    Throws:
    
    JsonMappingException - if there are fatal problems with accessing suitable deserializer; including that of not finding any serializer
  - findTypedValueDeserializer
```
public JsonDeserializer<Object> findTypedValueDeserializer(DeserializationConfig config,
                                                           JavaType type,
                                                           BeanProperty property)
                                                    throws JsonMappingException
```
    Description copied from class: DeserializerProvider
    
    Method called to locate deserializer for given type, as well as matching type deserializer (if one is needed); and if type deserializer is needed, construct a "wrapped" deserializer that can extract and use type information for calling actual deserializer.
    Since this method is only called for root elements, no referral information is taken.
    
    Specified by:
    
    findTypedValueDeserializer in class DeserializerProvider
    
    Throws:
    
    JsonMappingException
  - findKeyDeserializer
```
public KeyDeserializer findKeyDeserializer(DeserializationConfig config,
                                           JavaType type,
                                           BeanProperty property)
                                    throws JsonMappingException
```
    Description copied from class: DeserializerProvider
    
    Method called to get hold of a deserializer to use for deserializing keys for Map.
    
    Specified by:
    
    findKeyDeserializer in class DeserializerProvider
    
    Throws:
    
    JsonMappingException - if there are fatal problems with accessing suitable key deserializer; including that of not finding any serializer
  - hasValueDeserializerFor
```
public boolean hasValueDeserializerFor(DeserializationConfig config,
                                       JavaType type)
```
    Method that can be called to find out whether a deserializer can be found for given type
    
    Specified by:
    
    hasValueDeserializerFor in class DeserializerProvider
  - cachedDeserializersCount
```
public int cachedDeserializersCount()
```
    Description copied from class: DeserializerProvider
    
    Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works).
    The main use case for this method is to allow conditional flushing of deserializer cache, if certain number of entries is reached.
    
    Specified by:
    
    cachedDeserializersCount in class DeserializerProvider
  - flushCachedDeserializers
```
public void flushCachedDeserializers()
```
    Method that will drop all dynamically constructed deserializers (ones that are counted as result value for cachedDeserializersCount()). This can be used to remove memory usage (in case some deserializers are only used once or so), or to force re-construction of deserializers after configuration changes for mapper than owns the provider.
    
    Specified by:
    
    flushCachedDeserializers in class DeserializerProvider
    
    Since:
    
    1.4
  - _findCachedDeserializer
```
protected JsonDeserializer<Object> _findCachedDeserializer(JavaType type)
```
  - _createAndCacheValueDeserializer
```
protected JsonDeserializer<Object> _createAndCacheValueDeserializer(DeserializationConfig config,
                                                                    JavaType type,
                                                                    BeanProperty property)
                                                             throws JsonMappingException
```
    Method that will try to create a deserializer for given type, and resolve and cache it if necessary
    
    Parameters:
    
    config - Configuration
    
    type - Type of property to deserializer
    
    property - Property (field, setter, ctor arg) to use deserializer for
    
    Throws:
    
    JsonMappingException
  - _createAndCache2
```
protected JsonDeserializer<Object> _createAndCache2(DeserializationConfig config,
                                                    JavaType type,
                                                    BeanProperty property)
                                             throws JsonMappingException
```
    Method that handles actual construction (via factory) and caching (both intermediate and eventual)
    
    Throws:
    
    JsonMappingException
  - _createDeserializer
```
protected JsonDeserializer<Object> _createDeserializer(DeserializationConfig config,
                                                       JavaType type,
                                                       BeanProperty property)
                                                throws JsonMappingException
```
    Throws:
    
    JsonMappingException
  - _resolveDeserializer
```
protected void _resolveDeserializer(DeserializationConfig config,
                                    ResolvableDeserializer ser)
                             throws JsonMappingException
```
    Throws:
    
    JsonMappingException
  - _handleUnknownValueDeserializer
```
protected JsonDeserializer<Object> _handleUnknownValueDeserializer(JavaType type)
                                                            throws JsonMappingException
```
    Throws:
    
    JsonMappingException
  - _handleUnknownKeyDeserializer
```
protected KeyDeserializer _handleUnknownKeyDeserializer(JavaType type)
                                                 throws JsonMappingException
```
    Throws:
    
    JsonMappingException

Constructor	Description
`StdDeserializerProvider()`	Default constructor.
`StdDeserializerProvider(DeserializerFactory f)`

Class StdDeserializerProvider

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

_cachedDeserializers

_incompleteDeserializers

_rootNames

_factory

Constructor Detail

StdDeserializerProvider

StdDeserializerProvider

Method Detail

withAdditionalDeserializers

withAdditionalKeyDeserializers

withDeserializerModifier

withAbstractTypeResolver

withValueInstantiators

withFactory

mapAbstractType

findExpectedRootName

findValueDeserializer

findTypedValueDeserializer

findKeyDeserializer

hasValueDeserializerFor

cachedDeserializersCount

flushCachedDeserializers

_findCachedDeserializer

_createAndCacheValueDeserializer

_createAndCache2

_createDeserializer

_resolveDeserializer

_handleUnknownValueDeserializer

_handleUnknownKeyDeserializer