com.fasterxml.jackson.databind

Class DeserializationContext

java.lang.Object

com.fasterxml.jackson.databind.DatabindContext

com.fasterxml.jackson.databind.DeserializationContext

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

DefaultDeserializationContext

public abstract class DeserializationContext
extends DatabindContext
implements Serializable

Context for the process of deserialization a single root-level value. Used to allow passing in configuration settings and reusable temporary objects (scrap arrays, containers).

Instance life-cycle is such that an partially configured "blueprint" object is registered with ObjectMapper (and ObjectReader, and when an actual instance is needed for deserialization, a fully configured instance will be created using a method in excented API of sub-class (DefaultDeserializationContext.createInstance(com.fasterxml.jackson.databind.DeserializationConfig, com.fasterxml.jackson.core.JsonParser, com.fasterxml.jackson.databind.InjectableValues)). Each instance is guaranteed to only be used from single-threaded context; instances may be reused iff no configuration has changed.

Defined as abstract class so that implementations must define methods for reconfiguring blueprints and creating instances.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected ArrayBuilders	_arrayBuilders
protected DeserializerCache	_cache Object that handle details of JsonDeserializer caching.
protected DeserializationConfig	_config Generic deserialization processing configuration
protected DateFormat	_dateFormat
protected DeserializerFactory	_factory Read-only factory instance; exposed to let owners (ObjectMapper, ObjectReader) access it.
protected int	_featureFlags Bitmap of DeserializationFeatures that are enabled
protected InjectableValues	_injectableValues Object used for resolving references to injectable values.
protected ObjectBuffer	_objectBuffer
protected JsonParser	_parser Currently active parser used for deserialization.
protected Class<?>	_view Currently active view, if any.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DeserializationContext(DeserializationContext src, DeserializationConfig config, JsonParser jp, InjectableValues injectableValues)
protected	DeserializationContext(DeserializationContext src, DeserializerFactory factory)
protected	DeserializationContext(DeserializerFactory df)
protected	DeserializationContext(DeserializerFactory df, DeserializerCache cache)

Method Summary

Methods

Modifier and Type	Method and Description
protected String	_calcName(Class<?> cls)
protected String	_desc(String desc)
protected String	_valueDesc()
Calendar	constructCalendar(Date d) Convenience method for constructing Calendar instance set to specified time, to be modified and used by caller.
JavaType	constructType(Class<?> cls) Convenience method, functionally equivalent to:
abstract JsonDeserializer<Object>	deserializerInstance(Annotated annotated, Object deserDef)
protected String	determineClassName(Object instance)
JsonMappingException	endOfInputException(Class<?> instClass)
Class<?>	findClass(String className) Helper method to use for locating Class for given name.
JsonDeserializer<Object>	findContextualValueDeserializer(JavaType type, BeanProperty property) Method for finding a value deserializer, and creating a contextual version if necessary, for value reached via specified property.
Object	findInjectableValue(Object valueId, BeanProperty forProperty, Object beanInstance)
KeyDeserializer	findKeyDeserializer(JavaType keyType, BeanProperty property) Convenience method, functionally same as:
abstract ReadableObjectId	findObjectId(Object id, ObjectIdGenerator<?> generator) Method called to find and return entry corresponding to given Object Id: will add an entry if necessary, and never returns null
JsonDeserializer<Object>	findRootValueDeserializer(JavaType type) Method for finding a deserializer for root-level value.
Class<?>	getActiveView() Accessor for locating currently active view, if any; returns null if no view has been set.
AnnotationIntrospector	getAnnotationIntrospector() Convenience method for accessing serialization view in use (if any); equivalent to:
ArrayBuilders	getArrayBuilders() Method for accessing object useful for building arrays of primitive types (such as int[]).
Base64Variant	getBase64Variant() Convenience method for accessing the default Base64 encoding used for decoding base64 encoded binary content.
DeserializationConfig	getConfig() Accessor to currently active configuration (both per-request configs and per-mapper config).
protected DateFormat	getDateFormat()
DeserializerFactory	getFactory() Method for getting current DeserializerFactory.
Locale	getLocale() Method for accessing default Locale to use: convenience method for
JsonNodeFactory	getNodeFactory() Convenience method, functionally equivalent to:
JsonParser	getParser() Method for accessing the currently active parser.
TimeZone	getTimeZone() Method for accessing default TimeZone to use: convenience method for
TypeFactory	getTypeFactory()
boolean	handleUnknownProperty(JsonParser jp, JsonDeserializer<?> deser, Object instanceOrClass, String propName) Method deserializers can call to inform configured DeserializationProblemHandlers of an unrecognized property.
boolean	hasValueDeserializerFor(JavaType type) Method for checking whether we could find a deserializer for given type.
JsonMappingException	instantiationException(Class<?> instClass, String msg)
JsonMappingException	instantiationException(Class<?> instClass, Throwable t) Helper method for constructing instantiation exception for specified type, to indicate problem with physically constructing instance of specified class (missing constructor, exception from constructor)
boolean	isEnabled(DeserializationFeature feat) Convenience method for checking whether specified on/off feature is enabled
abstract KeyDeserializer	keyDeserializerInstance(Annotated annotated, Object deserDef)
ObjectBuffer	leaseObjectBuffer() Method that can be used to get access to a reusable ObjectBuffer, useful for efficiently constructing Object arrays and Lists.
JsonMappingException	mappingException(Class<?> targetClass) Helper method for constructing generic mapping exception for specified type
JsonMappingException	mappingException(Class<?> targetClass, JsonToken token)
JsonMappingException	mappingException(String message) Helper method for constructing generic mapping exception with specified message and current location information
Date	parseDate(String dateStr) Convenience method for parsing a Date from given String, using currently configured date format (accessed using MapperConfig.getDateFormat()).
void	reportUnknownProperty(Object instanceOrClass, String fieldName, JsonDeserializer<?> deser) Helper method for reporting a problem with unhandled unknown exception
void	returnObjectBuffer(ObjectBuffer buf) Method to call to return object buffer previously leased with leaseObjectBuffer().
JsonMappingException	unknownTypeException(JavaType type, String id) Helper method for constructing exception to indicate that given type id (parsed from JSON) could not be converted to a Java type.
JsonMappingException	weirdKeyException(Class<?> keyClass, String keyValue, String msg) Helper method for constructing exception to indicate that given JSON Object field name was not in format to be able to deserialize specified key type.
JsonMappingException	weirdNumberException(Class<?> instClass, String msg) Deprecated.
JsonMappingException	weirdNumberException(Number value, Class<?> instClass, String msg) Helper method for constructing exception to indicate that input JSON Number was not suitable for deserializing into given target type.
JsonMappingException	weirdStringException(Class<?> instClass, String msg) Deprecated. Since 2.1 should use variant that takes value
JsonMappingException	weirdStringException(String value, Class<?> instClass, String msg) Method that will construct an exception suitable for throwing when some String values are acceptable, but the one encountered is not.
JsonMappingException	wrongTokenException(JsonParser jp, JsonToken expToken, String msg) Helper method for indicating that the current token was expected to be another token.

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

canOverrideAccessModifiers, constructSpecializedType, constructType, converterInstance, isEnabled, objectIdGeneratorInstance

Methods inherited from class java.lang.Object

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

Field Detail

_cache

protected final DeserializerCache _cache

Object that handle details of JsonDeserializer caching.

_factory

protected final DeserializerFactory _factory

Read-only factory instance; exposed to let owners (ObjectMapper, ObjectReader) access it.

_config

protected final DeserializationConfig _config

Generic deserialization processing configuration

_featureFlags

protected final int _featureFlags

Bitmap of DeserializationFeatures that are enabled

_view

protected final Class<?> _view

Currently active view, if any.

_parser

protected transient JsonParser _parser

Currently active parser used for deserialization. May be different from the outermost parser when content is buffered.

_injectableValues

protected final InjectableValues _injectableValues

Object used for resolving references to injectable values.

_arrayBuilders

protected transient ArrayBuilders _arrayBuilders

_objectBuffer

protected transient ObjectBuffer _objectBuffer

_dateFormat

protected transient DateFormat _dateFormat

Constructor Detail

DeserializationContext

protected DeserializationContext(DeserializerFactory df)

DeserializationContext

protected DeserializationContext(DeserializerFactory df,
                      DeserializerCache cache)

DeserializationContext

protected DeserializationContext(DeserializationContext src,
                      DeserializerFactory factory)

DeserializationContext

protected DeserializationContext(DeserializationContext src,
                      DeserializationConfig config,
                      JsonParser jp,
                      InjectableValues injectableValues)

Method Detail

getConfig

public DeserializationConfig getConfig()

Description copied from class: DatabindContext

Accessor to currently active configuration (both per-request configs and per-mapper config).

Specified by:

getConfig in class DatabindContext

getActiveView

public final Class<?> getActiveView()

Description copied from class: DatabindContext

Accessor for locating currently active view, if any; returns null if no view has been set.

Specified by:

getActiveView in class DatabindContext

getAnnotationIntrospector

public final AnnotationIntrospector getAnnotationIntrospector()

Description copied from class: DatabindContext

Convenience method for accessing serialization view in use (if any); equivalent to:

   getConfig().getAnnotationIntrospector();

Specified by:

getAnnotationIntrospector in class DatabindContext

getTypeFactory

public final TypeFactory getTypeFactory()

Specified by:

getTypeFactory in class DatabindContext

getFactory

public DeserializerFactory getFactory()

Method for getting current DeserializerFactory.

isEnabled

public final boolean isEnabled(DeserializationFeature feat)

Convenience method for checking whether specified on/off feature is enabled

getParser

public final JsonParser getParser()

Method for accessing the currently active parser. May be different from the outermost parser when content is buffered.

Use of this method is discouraged: if code has direct access to the active parser, that should be used instead.

findInjectableValue

public final Object findInjectableValue(Object valueId,
                         BeanProperty forProperty,
                         Object beanInstance)

getBase64Variant

public final Base64Variant getBase64Variant()

Convenience method for accessing the default Base64 encoding used for decoding base64 encoded binary content. Same as calling:

  getConfig().getBase64Variant();

getNodeFactory

public final JsonNodeFactory getNodeFactory()

Convenience method, functionally equivalent to:

  getConfig().getNodeFactory();
 

getLocale

public Locale getLocale()

Method for accessing default Locale to use: convenience method for

   getConfig().getLocale();

getTimeZone

public TimeZone getTimeZone()

Method for accessing default TimeZone to use: convenience method for

   getConfig().getTimeZone();

hasValueDeserializerFor

public boolean hasValueDeserializerFor(JavaType type)

Method for checking whether we could find a deserializer for given type.

findContextualValueDeserializer

public final JsonDeserializer<Object> findContextualValueDeserializer(JavaType type,
                                                       BeanProperty property)
                                                               throws JsonMappingException

Method for finding a value deserializer, and creating a contextual version if necessary, for value reached via specified property.

Throws:

JsonMappingException

findRootValueDeserializer

public final JsonDeserializer<Object> findRootValueDeserializer(JavaType type)
                                                         throws JsonMappingException

Method for finding a deserializer for root-level value.

Throws:

JsonMappingException

findKeyDeserializer

public final KeyDeserializer findKeyDeserializer(JavaType keyType,
                                  BeanProperty property)
                                          throws JsonMappingException

Convenience method, functionally same as:

  getDeserializerProvider().findKeyDeserializer(getConfig(), propertyType, property);

Throws:

JsonMappingException

findObjectId

public abstract ReadableObjectId findObjectId(Object id,
                            ObjectIdGenerator<?> generator)

Method called to find and return entry corresponding to given Object Id: will add an entry if necessary, and never returns null

constructType

public final JavaType constructType(Class<?> cls)

Convenience method, functionally equivalent to:

  getConfig().constructType(cls);
 

findClass

public Class<?> findClass(String className)
                   throws ClassNotFoundException

Helper method to use for locating Class for given name. Should be used instead of basic Class.forName(className); as it can try using contextual class loader, or use platform-specific workarounds (like on Android, GAE).

Throws:

ClassNotFoundException

deserializerInstance

public abstract JsonDeserializer<Object> deserializerInstance(Annotated annotated,
                                            Object deserDef)
                                                       throws JsonMappingException

Throws:

JsonMappingException

keyDeserializerInstance

public abstract KeyDeserializer keyDeserializerInstance(Annotated annotated,
                                      Object deserDef)
                                                 throws JsonMappingException

Throws:

JsonMappingException

leaseObjectBuffer

public final ObjectBuffer leaseObjectBuffer()

Method that can be used to get access to a reusable ObjectBuffer, useful for efficiently constructing Object arrays and Lists. Note that leased buffers should be returned once deserializer is done, to allow for reuse during same round of deserialization.

returnObjectBuffer

public final void returnObjectBuffer(ObjectBuffer buf)

Method to call to return object buffer previously leased with leaseObjectBuffer().

Parameters:

buf - Returned object buffer

getArrayBuilders

public final ArrayBuilders getArrayBuilders()

Method for accessing object useful for building arrays of primitive types (such as int[]).

parseDate

public Date parseDate(String dateStr)
               throws IllegalArgumentException

Convenience method for parsing a Date from given String, using currently configured date format (accessed using MapperConfig.getDateFormat()).

Implementation will handle thread-safety issues related to date formats such that first time this method is called, date format is cloned, and cloned instance will be retained for use during this deserialization round.

Throws:

IllegalArgumentException

constructCalendar

public Calendar constructCalendar(Date d)

Convenience method for constructing Calendar instance set to specified time, to be modified and used by caller.

handleUnknownProperty

public boolean handleUnknownProperty(JsonParser jp,
                            JsonDeserializer<?> deser,
                            Object instanceOrClass,
                            String propName)
                              throws IOException,
                                     JsonProcessingException

Method deserializers can call to inform configured DeserializationProblemHandlers of an unrecognized property.

Throws:

IOException

JsonProcessingException

reportUnknownProperty

public void reportUnknownProperty(Object instanceOrClass,
                         String fieldName,
                         JsonDeserializer<?> deser)
                           throws JsonMappingException

Helper method for reporting a problem with unhandled unknown exception

Parameters:

instanceOrClass - Either value being populated (if one has been instantiated), or Class that indicates type that would be (or have been) instantiated

deser - Deserializer that had the problem, if called by deserializer (or on behalf of one)

Throws:

JsonMappingException

mappingException

public JsonMappingException mappingException(Class<?> targetClass)

Helper method for constructing generic mapping exception for specified type

mappingException

public JsonMappingException mappingException(Class<?> targetClass,
                                    JsonToken token)

mappingException

public JsonMappingException mappingException(String message)

Helper method for constructing generic mapping exception with specified message and current location information

instantiationException

public JsonMappingException instantiationException(Class<?> instClass,
                                          Throwable t)

Helper method for constructing instantiation exception for specified type, to indicate problem with physically constructing instance of specified class (missing constructor, exception from constructor)

instantiationException

public JsonMappingException instantiationException(Class<?> instClass,
                                          String msg)

weirdStringException

@Deprecated
public JsonMappingException weirdStringException(Class<?> instClass,
                                                   String msg)

Deprecated. Since 2.1 should use variant that takes value

Method that will construct an exception suitable for throwing when some String values are acceptable, but the one encountered is not.

weirdStringException

public JsonMappingException weirdStringException(String value,
                                        Class<?> instClass,
                                        String msg)

Method that will construct an exception suitable for throwing when some String values are acceptable, but the one encountered is not.

Parameters:

value - String value from input being deserialized

instClass - Type that String should be deserialized into

msg - Message that describes specific problem

Since:

2.1

weirdNumberException

@Deprecated
public JsonMappingException weirdNumberException(Class<?> instClass,
                                                   String msg)

Deprecated.

Helper method for constructing exception to indicate that input JSON Number was not suitable for deserializing into given type.

weirdNumberException

public JsonMappingException weirdNumberException(Number value,
                                        Class<?> instClass,
                                        String msg)

Helper method for constructing exception to indicate that input JSON Number was not suitable for deserializing into given target type.

weirdKeyException

public JsonMappingException weirdKeyException(Class<?> keyClass,
                                     String keyValue,
                                     String msg)

Helper method for constructing exception to indicate that given JSON Object field name was not in format to be able to deserialize specified key type.

wrongTokenException

public JsonMappingException wrongTokenException(JsonParser jp,
                                       JsonToken expToken,
                                       String msg)

Helper method for indicating that the current token was expected to be another token.

unknownTypeException

public JsonMappingException unknownTypeException(JavaType type,
                                        String id)

Helper method for constructing exception to indicate that given type id (parsed from JSON) could not be converted to a Java type.

endOfInputException

public JsonMappingException endOfInputException(Class<?> instClass)

getDateFormat

protected DateFormat getDateFormat()

determineClassName

protected String determineClassName(Object instance)

_calcName

protected String _calcName(Class<?> cls)

_valueDesc

protected String _valueDesc()

_desc

protected String _desc(String desc)