org.codehaus.jackson.map.SerializationConfig Maven / Gradle / Ivy
package org.codehaus.jackson.map;
import java.text.DateFormat;
import java.util.*;
import org.codehaus.jackson.annotate.*;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion; // for javadocs
import org.codehaus.jackson.map.introspect.Annotated;
import org.codehaus.jackson.map.introspect.AnnotatedClass;
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.ser.FilterProvider;
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.type.JavaType;
/**
* Object that contains baseline configuration for serialization
* process. An instance is owned by {@link ObjectMapper}, which makes
* a copy that is passed during serialization process to
* {@link SerializerProvider} and {@link SerializerFactory}.
*
* 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 serializer
* instance. This because some objects may be configured, constructed and
* cached first time they are needed.
*/
public class SerializationConfig
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 regualr "getter" methods are
* automatically detected based on standard Bean naming convention
* or not. If yes, then all public zero-argument methods that
* start with prefix "get"
* are considered as getters.
* If disabled, only methods explicitly annotated are considered getters.
*
* Note that since version 1.3, this does NOT include
* "is getters" (see {@link #AUTO_DETECT_IS_GETTERS} for details)
*
* 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_GETTERS(true),
/**
* Feature that determines whether "is getter" methods are
* automatically detected based on standard Bean naming convention
* or not. If yes, then all public zero-argument methods that
* start with prefix "is", and whose return type is boolean
* are considered as "is getters".
* If disabled, only methods explicitly annotated are considered getters.
*
* 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_IS_GETTERS(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 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),
/*
/******************************************************
* Generic output features
/******************************************************
*/
/**
* Feature that determines the default settings of whether Bean
* properties with null values are to be written out.
*
* Feature is enabled by default (null properties written).
*
* Note too that there is annotation
* {@link org.codehaus.jackson.annotate.JsonWriteNullProperties}
* that can be used for more granular control (annotates bean
* classes or individual property access methods).
*
* @deprecated As of 1.1, use {@link SerializationConfig#setSerializationInclusion}
* instead
*/
@Deprecated
WRITE_NULL_PROPERTIES(true),
/**
* Feature that determines whether the type detection for
* serialization should be using actual dynamic runtime type,
* or declared static type.
* Default value is false, to use dynamic runtime type.
*
* This global default value can be overridden at class, method
* or field level by using {@link JsonSerialize#typing} annotation
* property
*/
USE_STATIC_TYPING(false),
/**
* Feature that determines whether properties that have no view
* annotations are included in JSON serialization views (see
* {@link org.codehaus.jackson.map.annotate.JsonView} for more
* details on JSON Views).
* If enabled, non-annotated properties will be included;
* when disabled, they will be excluded. So this feature
* changes between "opt-in" (feature disabled) and
* "opt-out" (feature enabled) modes.
*
* Default value is enabled, meaning that non-annotated
* properties are included in all views if there is no
* {@link org.codehaus.jackson.map.annotate.JsonView} annotation.
*
* @since 1.5
*/
DEFAULT_VIEW_INCLUSION(true),
/**
* Feature that can be enabled to make root value (usually JSON
* Object but can be any type) wrapped within a single property
* JSON object, where key as the "root name", as determined by
* annotation introspector (esp. for JAXB that uses
* @XmlRootElement.name) or fallback (non-qualified
* class name).
* Feature is mostly intended for JAXB compatibility.
*
* Default setting is false, meaning root value is not wrapped.
*
* @since 1.7
*/
WRAP_ROOT_VALUE(false),
/**
* Feature that allows enabling (or disabling) indentation
* for the underlying generator, using the default pretty
* printer (see
* {@link org.codehaus.jackson.JsonGenerator#useDefaultPrettyPrinter}
* for details).
*
* Note that this only affects cases where
* {@link org.codehaus.jackson.JsonGenerator}
* is constructed implicitly by ObjectMapper: if explicit
* generator is passed, its configuration is not changed.
*
* Also note that if you want to configure details of indentation,
* you need to directly configure the generator: there is a
* method to use any PrettyPrinter instance.
* This feature will only allow using the default implementation.
*/
INDENT_OUTPUT(false),
/**
* Feature that defines default property serialization order:
* if enabled, default ordering is alphabetic (similar to
* how {@link org.codehaus.jackson.annotate.JsonPropertyOrder#alphabetic()}
* works); if disabled, order is unspecified (based on what JDK gives
* us, which may be declaration order, but not guaranteed).
*
* Note that this is just the default behavior, and can be overridden by
* explicit overrides in classes.
*
* @since 1.8
*/
SORT_PROPERTIES_ALPHABETICALLY(false),
/*
/******************************************************
* Error handling features
/******************************************************
*/
/**
* Feature that determines what happens when no accessors are
* found for a type (and there are no annotations to indicate
* it is meant to be serialized). If enabled (default), an
* exception is thrown to indicate these as non-serializable
* types; if disabled, they are serialized as empty Objects,
* i.e. without any properties.
*
* Note that empty types that this feature has only effect on
* those "empty" beans that do not have any recognized annotations
* (like @JsonSerialize): ones that do have annotations
* do not result in an exception being thrown.
*
* @since 1.4
*/
FAIL_ON_EMPTY_BEANS(true),
/**
* 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),
/*
/******************************************************
* Output life cycle features
/******************************************************
*/
/**
* Feature that determines whether close method of
* serialized root level objects (ones for which ObjectMapper's
* writeValue() (or equivalent) method is called)
* that implement {@link java.io.Closeable}
* is called after serialization or not. If enabled, close() will
* be called after serialization completes (whether succesfully, or
* due to an error manifested by an exception being thrown). You can
* think of this as sort of "finally" processing.
*
* NOTE: only affects behavior with root objects, and not other
* objects reachable from the root object. Put another way, only one
* call will be made for each 'writeValue' call.
*
* @since 1.6 (see [JACKSON-282 for details])
*/
CLOSE_CLOSEABLE(false),
/**
* Feature that determines whether JsonGenerator.flush() is
* called after writeValue() method that takes JsonParser
* as an argument completes or not (i.e. does NOT affect methods
* that use other destinations); same for methods in {@link ObjectWriter}.
* This usually makes sense; but there are cases where flushing
* should not be forced: for example when underlying stream is
* compressing and flush() causes compression state to be flushed
* (which occurs with some compression codecs).
*
* @since 1.6 (see [JACKSON-401 for details])
*/
FLUSH_AFTER_WRITE_VALUE(true),
/*
/******************************************************
* Datatype-specific serialization configuration
/******************************************************
*/
/**
* Feature that determines whether {@link java.util.Date}s
* (and Date-based things like {@link java.util.Calendar}s) are to be
* serialized as numeric timestamps (true; the default),
* or as something else (usually textual representation).
* If textual representation is used, the actual format is
* one returned by a call to {@link #getDateFormat}.
*
* Note: whether this feature affects handling of other date-related
* types depend on handlers of those types.
*/
WRITE_DATES_AS_TIMESTAMPS(true),
/**
* Feature that determines how type char[] is serialized:
* when enabled, will be serialized as an explict JSON array (with
* single-character Strings as values); when disabled, defaults to
* serializing them as Strings (which is more compact).
*
* @since 1.6 (see [JACKSON-289 for details])
*/
WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS(false),
/**
* Feature that determines standard serialization mechanism used for
* Enum values: if enabled, return value of Enum.toString()
* is used; if disabled, return value of Enum.name() is 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 DeserializationConfig.Feature#READ_ENUMS_USING_TO_STRING}.
*
* For further details, check out [JACKSON-212]
*
* @since 1.6
*/
WRITE_ENUMS_USING_TO_STRING(false),
/**
* Feature that determines whether Map entries with null values are
* to be serialized (true) or not (false).
*
* For further details, check out [JACKSON-314]
*
* @since 1.6
*/
WRITE_NULL_MAP_VALUES(true)
;
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
/**********************************************************
*/
protected int _featureFlags = DEFAULT_FEATURE_FLAGS;
/**
* Which Bean/Map properties are to be included in serialization?
* Default settings is to include all regardless of value; can be
* changed to only include non-null properties, or properties
* with non-default values.
*
* Defaults to null for backwards compatibility; if left as null,
* will check
* deprecated {@link Feature#WRITE_NULL_PROPERTIES}
* to choose between {@link Inclusion#ALWAYS}
* and {@link Inclusion#NON_NULL}.
*/
protected JsonSerialize.Inclusion _serializationInclusion = null;
/**
* View to use for filtering out properties to serialize.
* Null if none (will also be assigned null if Object.class
* is defined), meaning that all properties are to be included.
*/
protected Class _serializationView;
/**
* Object used for resolving filter ids to filter instances.
* Non-null if explicitly defined; null by default.
*
* @since 1.7
*/
protected FilterProvider _filterProvider;
/*
/**********************************************************
/* Life-cycle, constructors
/**********************************************************
*/
/**
* Constructor used by ObjectMapper to create default configuration object instance.
*/
public SerializationConfig(ClassIntrospector intr,
AnnotationIntrospector annIntr, VisibilityChecker vc,
SubtypeResolver subtypeResolver, PropertyNamingStrategy propertyNamingStrategy,
TypeFactory typeFactory, HandlerInstantiator handlerInstantiator)
{
super(intr, annIntr, vc, subtypeResolver, propertyNamingStrategy, typeFactory, handlerInstantiator);
_filterProvider = null;
}
/**
* @since 1.8
*/
protected SerializationConfig(SerializationConfig src) {
this(src, src._base);
}
/**
* Constructor used to make a private copy of specific mix-in definitions.
*
* @since 1.8
*/
protected SerializationConfig(SerializationConfig src,
HashMap> mixins, SubtypeResolver str)
{
this(src, src._base);
_mixInAnnotations = mixins;
_mixInAnnotationsShared = false;
_subtypeResolver = str;
}
/**
* @since 1.8
*/
protected SerializationConfig(SerializationConfig src, MapperConfig.Base base)
{
super(base, src._subtypeResolver);
_featureFlags = src._featureFlags;
_serializationInclusion = src._serializationInclusion;
_serializationView = src._serializationView;
_filterProvider = src._filterProvider;
}
/**
* @since 1.8
*/
protected SerializationConfig(SerializationConfig src, FilterProvider filters)
{
super(src);
_featureFlags = src._featureFlags;
_serializationInclusion = src._serializationInclusion;
_serializationView = src._serializationView;
_filterProvider = filters;
}
/**
* @since 1.8
*/
protected SerializationConfig(SerializationConfig src, Class view)
{
super(src);
_featureFlags = src._featureFlags;
_serializationInclusion = src._serializationInclusion;
_serializationView = view;
_filterProvider = src._filterProvider;
}
/*
/**********************************************************
/* Life-cycle, factory methods from MapperConfig
/**********************************************************
*/
@Override
public SerializationConfig withClassIntrospector(ClassIntrospector ci) {
return new SerializationConfig(this, _base.withClassIntrospector(ci));
}
@Override
public SerializationConfig withAnnotationIntrospector(AnnotationIntrospector ai) {
return new SerializationConfig(this, _base.withAnnotationIntrospector(ai));
}
@Override
public SerializationConfig withVisibilityChecker(VisibilityChecker vc) {
return new SerializationConfig(this, _base.withVisibilityChecker(vc));
}
@Override
public SerializationConfig withTypeResolverBuilder(TypeResolverBuilder trb) {
return new SerializationConfig(this, _base.withTypeResolverBuilder(trb));
}
@Override
public SerializationConfig withSubtypeResolver(SubtypeResolver str) {
SerializationConfig cfg = new SerializationConfig(this);
cfg._subtypeResolver = str;
return cfg;
}
@Override
public SerializationConfig withPropertyNamingStrategy(PropertyNamingStrategy pns) {
return new SerializationConfig(this, _base.withPropertyNamingStrategy(pns));
}
@Override
public SerializationConfig withTypeFactory(TypeFactory tf) {
return new SerializationConfig(this, _base.withTypeFactory(tf));
}
/**
* In addition to constructing instance with specified date format,
* will enable or disable Feature.WRITE_DATES_AS_TIMESTAMPS
* (enable if format set as null; disable if non-null)
*/
@Override
public SerializationConfig withDateFormat(DateFormat df) {
SerializationConfig cfg = new SerializationConfig(this, _base.withDateFormat(df));
// And also
cfg.set(Feature.WRITE_DATES_AS_TIMESTAMPS, (df == null));
return cfg;
}
@Override
public SerializationConfig withHandlerInstantiator(HandlerInstantiator hi) {
return new SerializationConfig(this, _base.withHandlerInstantiator(hi));
}
/*
/**********************************************************
/* Life-cycle, SerializationConfig specific factory methods
/**********************************************************
*/
/**
* @since 1.7
*/
public SerializationConfig withFilters(FilterProvider filterProvider) {
return new SerializationConfig(this, filterProvider);
}
/**
* @since 1.8
*/
public SerializationConfig withView(Class view) {
return new SerializationConfig(this, view);
}
/*
/**********************************************************
/* 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.
*
* Serialization annotations that are known to have effect are:
*
* - {@link JsonWriteNullProperties}
* - {@link JsonAutoDetect}
* - {@link JsonSerialize#typing}
*
*
* @param cls Class of which class annotations to use
* for changing configuration settings
*/
@Override
public void fromAnnotations(Class cls)
{
/* 10-Jul-2009, tatu: Should be able to just pass null as
* 'MixInResolver'; no mix-ins set at this point
* 29-Jul-2009, tatu: Also, we do NOT ignore annotations here, even
* if Feature.USE_ANNOTATIONS was disabled, since caller
* specifically requested annotations to be added with this call
*/
AnnotationIntrospector ai = getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(cls, ai, null);
_base = _base.withVisibilityChecker(ai.findAutoDetectVisibility(ac,
getDefaultVisibilityChecker()));
// How about writing null property values?
JsonSerialize.Inclusion incl = ai.findSerializationInclusion(ac, null);
if (incl != _serializationInclusion) {
setSerializationInclusion(incl);
}
JsonSerialize.Typing typing = ai.findSerializationTyping(ac);
if (typing != null) {
set(Feature.USE_STATIC_TYPING, (typing == JsonSerialize.Typing.STATIC));
}
}
@Override
public SerializationConfig createUnshared(SubtypeResolver subtypeResolver)
{
HashMap> mixins = _mixInAnnotations;
_mixInAnnotationsShared = true;
return new SerializationConfig(this, mixins, subtypeResolver);
}
@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 AnnotationIntrospector.nopInstance();
}
/**
* 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
*/
@SuppressWarnings("unchecked")
@Override
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
*/
@SuppressWarnings("unchecked")
@Override
public T introspectDirectClassAnnotations(Class cls) {
return (T) getClassIntrospector().forDirectClassAnnotations(this, cls, this);
}
@Override
public boolean isAnnotationProcessingEnabled() {
return isEnabled(SerializationConfig.Feature.USE_ANNOTATIONS);
}
@Override
public boolean canOverrideAccessModifiers() {
return isEnabled(Feature.CAN_OVERRIDE_ACCESS_MODIFIERS);
}
/*
/**********************************************************
/* 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);
}
}
//protected int getFeatures() { return _generatorFeatures; }
/**
* Method for checking whether given feature is enabled or not
*/
public final boolean isEnabled(Feature f) {
return (_featureFlags & f.getMask()) != 0;
}
/*
/**********************************************************
/* Configuration: other
/**********************************************************
*/
/**
* Method for checking which serialization view is being used,
* if any; null if none.
*
* @since 1.4
*/
public Class getSerializationView() { return _serializationView; }
public JsonSerialize.Inclusion getSerializationInclusion()
{
if (_serializationInclusion != null) {
return _serializationInclusion;
}
return isEnabled(Feature.WRITE_NULL_PROPERTIES) ?
JsonSerialize.Inclusion.ALWAYS : JsonSerialize.Inclusion.NON_NULL;
}
/**
* Method that will define global setting of which
* bean/map properties are to be included in serialization.
* Can be overridden by class annotations (overriding
* settings to use for instances of that class) and
* method/field annotations (overriding settings for the value
* bean for that getter method or field)
*/
public void setSerializationInclusion(JsonSerialize.Inclusion props)
{
_serializationInclusion = props;
// And for some level of backwards compatibility, also...
if (props == JsonSerialize.Inclusion.NON_NULL) {
disable(Feature.WRITE_NULL_PROPERTIES);
} else {
enable(Feature.WRITE_NULL_PROPERTIES);
}
}
/**
* Method for getting provider used for locating filters given
* id (which is usually provided with filter annotations).
* Will be null if no provided was set for {@link ObjectWriter}
* (or if serialization directly called from {@link ObjectMapper})
*
* @since 1.7
*/
public FilterProvider getFilterProvider() {
return _filterProvider;
}
/*
/**********************************************************
/* Introspection methods
/**********************************************************
*/
/**
* Method that will introspect full bean properties for the purpose
* of building a bean serializer
*/
@SuppressWarnings("unchecked")
public T introspect(JavaType type) {
return (T) getClassIntrospector().forSerialization(this, type, this);
}
/*
/**********************************************************
/* Extended API: serializer instantiation
/**********************************************************
*/
@SuppressWarnings("unchecked")
public JsonSerializer