org.codehaus.jackson.map.DeserializationConfig Maven / Gradle / Ivy
package org.codehaus.jackson.map;
import java.text.DateFormat;
import java.util.*;
import org.codehaus.jackson.Base64Variant;
import org.codehaus.jackson.Base64Variants;
import org.codehaus.jackson.annotate.*;
import org.codehaus.jackson.map.introspect.Annotated;
import org.codehaus.jackson.map.introspect.AnnotatedClass;
import org.codehaus.jackson.map.introspect.NopAnnotationIntrospector;
import org.codehaus.jackson.map.introspect.VisibilityChecker;
import org.codehaus.jackson.map.jsontype.SubtypeResolver;
import org.codehaus.jackson.map.jsontype.TypeResolverBuilder;
import org.codehaus.jackson.map.type.ClassKey;
import org.codehaus.jackson.map.type.TypeFactory;
import org.codehaus.jackson.map.util.ClassUtil;
import org.codehaus.jackson.map.util.LinkedNode;
import org.codehaus.jackson.node.JsonNodeFactory;
import org.codehaus.jackson.type.JavaType;
/**
* Object that contains baseline configuration for deserialization
* process. An instance is owned by {@link ObjectMapper}, which makes
* a copy that is passed during serialization process to
* {@link DeserializerProvider} and {@link DeserializerFactory}.
*
* Note: although configuration settings can be changed at any time
* (for factories and instances), they are not guaranteed to have
* effect if called after constructing relevant mapper or deserializer
* instance. This because some objects may be configured, constructed and
* cached first time they are needed.
*/
public class DeserializationConfig
extends MapperConfig
{
/**
* Enumeration that defines togglable features that guide
* the serialization feature.
*/
public enum Feature {
/*
/******************************************************
* Introspection features
/******************************************************
*/
/**
* Feature that determines whether annotation introspection
* is used for configuration; if enabled, configured
* {@link AnnotationIntrospector} will be used: if disabled,
* no annotations are considered.
*
* Feature is enabled by default.
*
* @since 1.2
*/
USE_ANNOTATIONS(true),
/**
* Feature that determines whether "setter" methods are
* automatically detected based on standard Bean naming convention
* or not. If yes, then all public one-argument methods that
* start with prefix "set"
* are considered setters. If disabled, only methods explicitly
* annotated are considered setters.
*
* Note that this feature has lower precedence than per-class
* annotations, and is only used if there isn't more granular
* configuration available.
*
* Feature is enabled by default.
*/
AUTO_DETECT_SETTERS(true),
/**
* Feature that determines whether "creator" methods are
* automatically detected by consider public constructors,
* and static single argument methods with name "valueOf".
* If disabled, only methods explicitly annotated are considered
* creator methods (except for the no-arg default constructor which
* is always considered a factory method).
*
* Note that this feature has lower precedence than per-class
* annotations, and is only used if there isn't more granular
* configuration available.
*
* Feature is enabled by default.
*/
AUTO_DETECT_CREATORS(true),
/**
* Feature that determines whether non-static fields are recognized as
* properties.
* If yes, then all public member fields
* are considered as properties. If disabled, only fields explicitly
* annotated are considered property fields.
*
* Note that this feature has lower precedence than per-class
* annotations, and is only used if there isn't more granular
* configuration available.
*
* Feature is enabled by default.
*
* @since 1.1
*/
AUTO_DETECT_FIELDS(true),
/**
* Feature that determines whether otherwise regular "getter"
* methods (but only ones that handle Collections and Maps,
* not getters of other type)
* can be used for purpose of getting a reference to a Collection
* and Map to modify the property, without requiring a setter
* method.
* This is similar to how JAXB framework sets Collections and
* Maps: no setter is involved, just setter.
*
* Note that such getters-as-setters methods have lower
* precedence than setters, so they are only used if no
* setter is found for the Map/Collection property.
*
* Feature is enabled by default.
*/
USE_GETTERS_AS_SETTERS(true),
/**
* Feature that determines whether method and field access
* modifier settings can be overridden when accessing
* properties. If enabled, method
* {@link java.lang.reflect.AccessibleObject#setAccessible}
* may be called to enable access to otherwise unaccessible
* objects.
*/
CAN_OVERRIDE_ACCESS_MODIFIERS(true),
/*
/******************************************************
* Type conversion features
/******************************************************
*/
/**
* Feature that determines whether Json floating point numbers
* are to be deserialized into {@link java.math.BigDecimal}s
* if only generic type description (either {@link Object} or
* {@link Number}, or within untyped {@link java.util.Map}
* or {@link java.util.Collection} context) is available.
* If enabled such values will be deserialized as {@link java.math.BigDecimal}s;
* if disabled, will be deserialized as {@link Double}s.
*
* Feature is disabled by default, meaning that "untyped" floating
* point numbers will by default be deserialized as {@link Double}s
* (choice is for performance reason -- BigDecimals are slower than
* Doubles)
*/
USE_BIG_DECIMAL_FOR_FLOATS(false),
/**
* Feature that determines whether Json integral (non-floating-point)
* numbers are to be deserialized into {@link java.math.BigInteger}s
* if only generic type description (either {@link Object} or
* {@link Number}, or within untyped {@link java.util.Map}
* or {@link java.util.Collection} context) is available.
* If enabled such values will be deserialized as
* {@link java.math.BigInteger}s;
* if disabled, will be deserialized as "smallest" available type,
* which is either {@link Integer}, {@link Long} or
* {@link java.math.BigInteger}, depending on number of digits.
*
* Feature is disabled by default, meaning that "untyped" floating
* point numbers will by default be deserialized using whatever
* is the most compact integral type, to optimize efficiency.
*/
USE_BIG_INTEGER_FOR_INTS(false),
/**
* Feature that determines standard deserialization mechanism used for
* Enum values: if enabled, Enums are assumed to have been serialized using
* return value of Enum.toString();
* if disabled, return value of Enum.name() is assumed to have been used.
* Since pre-1.6 method was to use Enum name, this is the default.
*
* Note: this feature should usually have same value
* as {@link SerializationConfig.Feature#WRITE_ENUMS_USING_TO_STRING}.
*
* For further details, check out [JACKSON-212]
*
* @since 1.6
*/
READ_ENUMS_USING_TO_STRING(false),
/*
/******************************************************
* Error handling features
/******************************************************
*/
/**
* Feature that determines whether encountering of unknown
* properties (ones that do not map to a property, and there is
* no "any setter" or handler that can handle it)
* should result in a failure (by throwing a
* {@link JsonMappingException}) or not.
* This setting only takes effect after all other handling
* methods for unknown properties have been tried, and
* property remains unhandled.
*
* Feature is enabled by default, meaning that
* {@link JsonMappingException} is thrown if an unknown property
* is encountered. This is the implicit default prior to
* introduction of the feature.
*
* @since 1.2
*/
FAIL_ON_UNKNOWN_PROPERTIES(true),
/**
* Feature that determines whether encountering of JSON null
* is an error when deserializing into Java primitive types
* (like 'int' or 'double'). If it is, a JsonProcessingException
* is thrown to indicate this; if not, default value is used
* (0 for 'int', 0.0 for double, same defaulting as what JVM uses).
*
* Feature is disabled by default (to be consistent with behavior
* of Jackson 1.6),
* i.e. to allow use of nulls for primitive properties.
*
* @since 1.7
*/
FAIL_ON_NULL_FOR_PRIMITIVES(false),
/**
* Feature that determines whether JSON integer numbers are valid
* values to be used for deserializing Java enum values.
* If set to 'false' numbers are acceptable and are used to map to
* ordinal() of matching enumeration value; if 'true', numbers are
* not allowed and a {@link JsonMappingException} will be thrown.
* Latter behavior makes sense if there is concern that accidental
* mapping from integer values to enums might happen (and when enums
* are always serialized as JSON Strings)
*
* Feature is disabled by default (to be consistent with behavior
* of Jackson 1.6),
* i.e. to allow use of JSON integers for Java enums.
*
* @since 1.7
*/
FAIL_ON_NUMBERS_FOR_ENUMS(false),
/**
* Feature that determines whether Jackson code should catch
* and wrap {@link Exception}s (but never {@link Error}s!)
* to add additional information about
* location (within input) of problem or not. If enabled,
* most exceptions will be caught and re-thrown (exception
* specifically being that {@link java.io.IOException}s may be passed
* as is, since they are declared as throwable); this can be
* convenient both in that all exceptions will be checked and
* declared, and so there is more contextual information.
* However, sometimes calling application may just want "raw"
* unchecked exceptions passed as is.
*
* Feature is enabled by default, and is similar in behavior
* to default prior to 1.7.
*
* @since 1.7
*/
WRAP_EXCEPTIONS(true),
/*
/******************************************************
* Structural conversion features
/******************************************************
*/
/**
* Feature that was planned to be enabled to handle "wrapped" values
* (see {@link SerializationConfig.Feature#WRAP_ROOT_VALUE}
* for details).
* NOTE: Not implemented (unlike its counterpart for serialization
* which was implemented in 1.7)
*
* @deprecated Never implemented; plus, incorrectly named: should be
* "UNWRAP_ROOT_VALUE" to be of use. Feature such named may be added in future.
*/
@Deprecated
WRAP_ROOT_VALUE(false),
/**
* Feature that can be enabled to allow JSON empty String
* value ("") to be bound to POJOs as null.
* If disabled, standard POJOs can only be bound from JSON null or
* JSON Object (standard meaning that no custom deserializers or
* constructors are defined; both of which can add support for other
* kinds of JSON values); if enable, empty JSON String can be taken
* to be equivalent of JSON null.
*
* @since 1.8
*/
ACCEPT_EMPTY_STRING_AS_NULL_OBJECT(false),
/**
* Feature that determines whether it is acceptable to coerce non-array
* (in JSON) values to work with Java collection (arrays, java.util.Collection)
* types. If enabled, collection deserializers will try to handle non-array
* values as if they had "implicit" surrounding JSON array.
* This feature is meant to be used for compatibility/interoperability reasons,
* to work with packages (such as XML-to-JSON converters) that leave out JSON
* array in cases where there is just a single element in array.
*
* @since 1.8
*/
ACCEPT_SINGLE_VALUE_AS_ARRAY(false)
/*
/******************************************************
* Other features
/******************************************************
*/
;
final boolean _defaultState;
/**
* Method that calculates bit set (flags) of all features that
* are enabled by default.
*/
public static int collectDefaults()
{
int flags = 0;
for (Feature f : values()) {
if (f.enabledByDefault()) {
flags |= f.getMask();
}
}
return flags;
}
private Feature(boolean defaultState) {
_defaultState = defaultState;
}
public boolean enabledByDefault() { return _defaultState; }
public int getMask() { return (1 << ordinal()); }
}
/**
* Bitfield (set of flags) of all Features that are enabled
* by default.
*/
protected final static int DEFAULT_FEATURE_FLAGS = Feature.collectDefaults();
/*
/**********************************************************
/* Configuration settings for deserialization
/**********************************************************
*/
/**
* Bit set that contains all enabled features
*/
protected int _featureFlags = DEFAULT_FEATURE_FLAGS;
/**
* Linked list that contains all registered problem handlers.
* Implementation as front-added linked list allows for sharing
* of the list (tail) without copying the list.
*/
protected LinkedNode _problemHandlers;
/**
* To support on-the-fly class generation for interface and abstract classes
* it is possible to register "abstract type resolver".
*
* Non-final to support deprecated legacy methods; should be made final for 2.0
*
* @since 1.6
*/
protected AbstractTypeResolver _abstractTypeResolver;
/**
* Factory used for constructing {@link org.codehaus.jackson.JsonNode} instances.
*
* Non-final to support deprecated legacy methods; should be made final for 2.0
*
* @since 1.6
*/
protected JsonNodeFactory _nodeFactory;
/*
/**********************************************************
/* Life-cycle, constructors
/**********************************************************
*/
/**
* Constructor used by ObjectMapper to create default configuration object instance.
*/
public DeserializationConfig(ClassIntrospector intr,
AnnotationIntrospector annIntr, VisibilityChecker vc,
SubtypeResolver subtypeResolver, PropertyNamingStrategy propertyNamingStrategy,
TypeFactory typeFactory, HandlerInstantiator handlerInstantiator)
{
super(intr, annIntr, vc, subtypeResolver, propertyNamingStrategy, typeFactory, handlerInstantiator);
_nodeFactory = JsonNodeFactory.instance;
}
/**
* @since 1.8
*/
protected DeserializationConfig(DeserializationConfig src) {
this(src, src._base);
}
/**
* Copy constructor used to create a non-shared instance with given mix-in
* annotation definitions and subtype resolver.
*
* @since 1.8
*/
private DeserializationConfig(DeserializationConfig src,
HashMap> mixins, SubtypeResolver str)
{
this(src, src._base);
_mixInAnnotations = mixins;
_mixInAnnotationsShared = false;
_subtypeResolver = str;
}
/**
* @since 1.8
*/
protected DeserializationConfig(DeserializationConfig src, MapperConfig.Base base)
{
super(base, src._subtypeResolver);
_featureFlags = src._featureFlags;
_abstractTypeResolver = src._abstractTypeResolver;
_problemHandlers = src._problemHandlers;
_nodeFactory = src._nodeFactory;
}
/**
* @since 1.8
*/
protected DeserializationConfig(DeserializationConfig src, JsonNodeFactory f)
{
super(src);
_featureFlags = src._featureFlags;
_abstractTypeResolver = src._abstractTypeResolver;
_problemHandlers = src._problemHandlers;
_nodeFactory = f;
}
/*
/**********************************************************
/* Life-cycle, factory methods from MapperConfig
/**********************************************************
*/
@Override
public DeserializationConfig withClassIntrospector(ClassIntrospector ci) {
return new DeserializationConfig(this, _base.withClassIntrospector(ci));
}
@Override
public DeserializationConfig withAnnotationIntrospector(AnnotationIntrospector ai) {
return new DeserializationConfig(this, _base.withAnnotationIntrospector(ai));
}
@Override
public DeserializationConfig withVisibilityChecker(VisibilityChecker vc) {
return new DeserializationConfig(this, _base.withVisibilityChecker(vc));
}
@Override
public DeserializationConfig withTypeResolverBuilder(TypeResolverBuilder trb) {
return new DeserializationConfig(this, _base.withTypeResolverBuilder(trb));
}
@Override
public DeserializationConfig withSubtypeResolver(SubtypeResolver str)
{
DeserializationConfig cfg = new DeserializationConfig(this);
cfg._subtypeResolver = str;
return cfg;
}
@Override
public DeserializationConfig withPropertyNamingStrategy(PropertyNamingStrategy pns) {
return new DeserializationConfig(this, _base.withPropertyNamingStrategy(pns));
}
@Override
public DeserializationConfig withTypeFactory(TypeFactory tf) {
return (tf == _base.getTypeFactory()) ? this : new DeserializationConfig(this, _base.withTypeFactory(tf));
}
@Override
public DeserializationConfig withDateFormat(DateFormat df) {
return (df == _base.getDateFormat()) ? this : new DeserializationConfig(this, _base.withDateFormat(df));
}
@Override
public DeserializationConfig withHandlerInstantiator(HandlerInstantiator hi) {
return (hi == _base.getHandlerInstantiator()) ? this : new DeserializationConfig(this, _base.withHandlerInstantiator(hi));
}
/*
/**********************************************************
/* Life-cycle, deserialization-specific factory methods
/**********************************************************
*/
/**
* @since 1.8
*/
public DeserializationConfig withNodeFactory(JsonNodeFactory f) {
return new DeserializationConfig(this, f);
}
/*
/**********************************************************
/* Configuration: on/off features
/**********************************************************
*/
/**
* Method for enabling specified feature.
*/
public void enable(Feature f) {
_featureFlags |= f.getMask();
}
/**
* Method for disabling specified feature.
*/
public void disable(Feature f) {
_featureFlags &= ~f.getMask();
}
/**
* Method for enabling or disabling specified feature.
*/
public void set(Feature f, boolean state)
{
if (state) {
enable(f);
} else {
disable(f);
}
}
/**
* Method for checking whether given feature is enabled or not
*/
public final boolean isEnabled(Feature f) {
return (_featureFlags & f.getMask()) != 0;
}
//protected int getFeatures() { return _generatorFeatures; }
/*
/**********************************************************
/* MapperConfig implementation
/**********************************************************
*/
/**
* Method that checks class annotations that the argument Object has,
* and modifies settings of this configuration object accordingly,
* similar to how those annotations would affect actual value classes
* annotated with them, but with global scope. Note that not all
* annotations have global significance, and thus only subset of
* Jackson annotations will have any effect.
*
* Ones that are known to have effect are:
*
* - {@link JsonAutoDetect}
*
*
* @param cls Class of which class annotations to use
* for changing configuration settings
*/
@Override
public void fromAnnotations(Class cls)
{
/* no class annotation for:
*
* - CAN_OVERRIDE_ACCESS_MODIFIERS
* - USE_BIG_DECIMAL_FOR_FLOATS
* - USE_BIG_INTEGER_FOR_INTS
* - USE_GETTERS_AS_SETTERS
*/
/* 10-Jul-2009, tatu: Should be able to just pass null as
* 'MixInResolver'; no mix-ins set at this point
*/
AnnotationIntrospector ai = getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(cls, ai, null);
// visibility checks handled via separate checker object...
VisibilityChecker prevVc = getDefaultVisibilityChecker();
_base = _base.withVisibilityChecker(ai.findAutoDetectVisibility(ac, prevVc));
}
/**
* Method that is called to create a non-shared copy of the configuration
* to be used for a deserialization operation.
* Note that if sub-classing
* and sub-class has additional instance methods,
* this method must be overridden to produce proper sub-class
* instance.
*/
@Override
public DeserializationConfig createUnshared(SubtypeResolver subtypeResolver)
{
HashMap> mixins = _mixInAnnotations;
_mixInAnnotationsShared = true;
return new DeserializationConfig(this, mixins, subtypeResolver);
}
/**
* Method for getting {@link AnnotationIntrospector} configured
* to introspect annotation values used for configuration.
*/
@Override
public AnnotationIntrospector getAnnotationIntrospector()
{
/* 29-Jul-2009, tatu: it's now possible to disable use of
* annotations; can be done using "no-op" introspector
*/
if (isEnabled(Feature.USE_ANNOTATIONS)) {
return super.getAnnotationIntrospector();
}
return NopAnnotationIntrospector.instance;
}
/**
* Accessor for getting bean description that only contains class
* annotations: useful if no getter/setter/creator information is needed.
*
* Note: part of {@link MapperConfig} since 1.7
*/
@Override
@SuppressWarnings("unchecked")
public T introspectClassAnnotations(Class cls) {
return (T) getClassIntrospector().forClassAnnotations(this, cls, this);
}
/**
* Accessor for getting bean description that only contains immediate class
* annotations: ones from the class, and its direct mix-in, if any, but
* not from super types.
*
* Note: part of {@link MapperConfig} since 1.7
*/
@Override
@SuppressWarnings("unchecked")
public T introspectDirectClassAnnotations(Class cls) {
return (T) getClassIntrospector().forDirectClassAnnotations(this, cls, this);
}
@Override
public boolean isAnnotationProcessingEnabled() {
return isEnabled(Feature.USE_ANNOTATIONS);
}
@Override
public boolean canOverrideAccessModifiers() {
return isEnabled(Feature.CAN_OVERRIDE_ACCESS_MODIFIERS);
}
/*
/**********************************************************
/* Problem handlers
/**********************************************************
*/
/**
* Method for getting head of the problem handler chain. May be null,
* if no handlers have been added.
*/
public LinkedNode getProblemHandlers()
{
return _problemHandlers;
}
/**
* Method that can be used to add a handler that can (try to)
* resolve non-fatal deserialization problems.
*/
public void addHandler(DeserializationProblemHandler h)
{
/* Sanity check: let's prevent adding same handler multiple
* times
*/
if (!LinkedNode.contains(_problemHandlers, h)) {
_problemHandlers = new LinkedNode(h, _problemHandlers);
}
}
/**
* Method for removing all configuring problem handlers; usually done to replace
* existing handler(s) with different one(s)
*
* @since 1.1
*/
public void clearHandlers()
{
_problemHandlers = null;
}
/*
/**********************************************************
/* Other configuration
/**********************************************************
*/
/**
* Method called during deserialization if Base64 encoded content
* needs to be decoded. Default version just returns default Jackson
* uses, which is modified-mime which does not add linefeeds (because
* those would have to be escaped in JSON strings).
*/
public Base64Variant getBase64Variant() {
return Base64Variants.getDefaultVariant();
}
/**
* @since 1.6
*/
public final JsonNodeFactory getNodeFactory() {
return _nodeFactory;
}
/*
/**********************************************************
/* Introspection methods
/**********************************************************
*/
/**
* Method that will introspect full bean properties for the purpose
* of building a bean deserializer
*
* @param type Type of class to be introspected
*/
@SuppressWarnings("unchecked")
public T introspect(JavaType type) {
return (T) getClassIntrospector().forDeserialization(this, type, this);
}
/**
* Method that will introspect subset of bean properties needed to
* construct bean instance.
*/
@SuppressWarnings("unchecked")
public T introspectForCreation(JavaType type) {
return (T) getClassIntrospector().forCreation(this, type, this);
}
/*
/**********************************************************
/* Extended API: handler instantiation
/**********************************************************
*/
@SuppressWarnings("unchecked")
public JsonDeserializer