com.fasterxml.jackson.databind.module.SimpleModule Maven / Gradle / Ivy
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package com.fasterxml.jackson.databind.module;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.jsontype.NamedType;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
/**
* Vanilla {@link Module} implementation that allows registration
* of serializers and deserializers, bean serializer
* and deserializer modifiers, registration of subtypes and mix-ins
* as well as some other commonly
* needed aspects (addition of custom {@link AbstractTypeResolver}s,
* {@link com.fasterxml.jackson.databind.deser.ValueInstantiator}s).
*
* NOTE: although it is not expected that sub-types should need to
* override {@link #setupModule(SetupContext)} method, if they choose
* to do so they MUST call super.setupModule(context);
* to ensure that registration works as expected.
*/
public class SimpleModule
extends Module
implements java.io.Serializable
{
// at 2.4.0:
private static final long serialVersionUID = -8905749147637667249L;
protected final String _name;
protected final Version _version;
protected SimpleSerializers _serializers = null;
protected SimpleDeserializers _deserializers = null;
protected SimpleSerializers _keySerializers = null;
protected SimpleKeyDeserializers _keyDeserializers = null;
/**
* Lazily-constructed resolver used for storing mappings from
* abstract classes to more specific implementing classes
* (which may be abstract or concrete)
*/
protected SimpleAbstractTypeResolver _abstractTypes = null;
/**
* Lazily-constructed resolver used for storing mappings from
* abstract classes to more specific implementing classes
* (which may be abstract or concrete)
*/
protected SimpleValueInstantiators _valueInstantiators = null;
/**
* @since 2.2
*/
protected BeanDeserializerModifier _deserializerModifier = null;
/**
* @since 2.2
*/
protected BeanSerializerModifier _serializerModifier = null;
/**
* Lazily-constructed map that contains mix-in definitions, indexed
* by target class, value being mix-in to apply.
*/
protected HashMap, Class> _mixins = null;
/**
* Set of subtypes to register, if any.
*/
protected LinkedHashSet _subtypes = null;
/**
* @since 2.3
*/
protected PropertyNamingStrategy _namingStrategy = null;
/*
/**********************************************************
/* Life-cycle: creation
/**********************************************************
*/
/**
* Constructors that should only be used for non-reusable
* convenience modules used by app code: "real" modules should
* use actual name and version number information.
*/
public SimpleModule() {
// when passing 'this', can not chain constructors...
_name = "SimpleModule-"+System.identityHashCode(this);
_version = Version.unknownVersion();
}
/**
* Convenience constructor that will default version to
* {@link Version#unknownVersion()}.
*/
public SimpleModule(String name) {
this(name, Version.unknownVersion());
}
/**
* Convenience constructor that will use specified Version,
* including name from {@link Version#getArtifactId()}
*/
public SimpleModule(Version version) {
_name = version.getArtifactId();
_version = version;
}
/**
* Constructor to use for actual reusable modules.
* ObjectMapper may use name as identifier to notice attempts
* for multiple registrations of the same module (although it
* does not have to).
*
* @param name Unique name of the module
* @param version Version of the module
*/
public SimpleModule(String name, Version version) {
_name = name;
_version = version;
}
/**
* @since 2.1
*/
public SimpleModule(String name, Version version,
Map,JsonDeserializer> deserializers) {
this(name, version, deserializers, null);
}
/**
* @since 2.1
*/
public SimpleModule(String name, Version version,
List> serializers) {
this(name, version, null, serializers);
}
/**
* @since 2.1
*/
public SimpleModule(String name, Version version,
Map,JsonDeserializer> deserializers,
List> serializers)
{
_name = name;
_version = version;
if (deserializers != null) {
_deserializers = new SimpleDeserializers(deserializers);
}
if (serializers != null) {
_serializers = new SimpleSerializers(serializers);
}
}
/*
/**********************************************************
/* Simple setters to allow overriding
/**********************************************************
*/
/**
* Resets all currently configured serializers.
*/
public void setSerializers(SimpleSerializers s) {
_serializers = s;
}
/**
* Resets all currently configured deserializers.
*/
public void setDeserializers(SimpleDeserializers d) {
_deserializers = d;
}
/**
* Resets all currently configured key serializers.
*/
public void setKeySerializers(SimpleSerializers ks) {
_keySerializers = ks;
}
/**
* Resets all currently configured key deserializers.
*/
public void setKeyDeserializers(SimpleKeyDeserializers kd) {
_keyDeserializers = kd;
}
/**
* Resets currently configured abstract type mappings
*/
public void setAbstractTypes(SimpleAbstractTypeResolver atr) {
_abstractTypes = atr;
}
/**
* Resets all currently configured value instantiators
*/
public void setValueInstantiators(SimpleValueInstantiators svi) {
_valueInstantiators = svi;
}
/**
* @since 2.2
*/
public SimpleModule setDeserializerModifier(BeanDeserializerModifier mod) {
_deserializerModifier = mod;
return this;
}
/**
* @since 2.2
*/
public SimpleModule setSerializerModifier(BeanSerializerModifier mod) {
_serializerModifier = mod;
return this;
}
/**
* @since 2.3
*/
protected SimpleModule setNamingStrategy(PropertyNamingStrategy naming) {
_namingStrategy = naming;
return this;
}
/*
/**********************************************************
/* Configuration methods
/**********************************************************
*/
public SimpleModule addSerializer(JsonSerializer ser)
{
if (_serializers == null) {
_serializers = new SimpleSerializers();
}
_serializers.addSerializer(ser);
return this;
}
public SimpleModule addSerializer(Class type, JsonSerializer ser)
{
if (_serializers == null) {
_serializers = new SimpleSerializers();
}
_serializers.addSerializer(type, ser);
return this;
}
public SimpleModule addKeySerializer(Class type, JsonSerializer ser)
{
if (_keySerializers == null) {
_keySerializers = new SimpleSerializers();
}
_keySerializers.addSerializer(type, ser);
return this;
}
public SimpleModule addDeserializer(Class type, JsonDeserializer deser)
{
if (_deserializers == null) {
_deserializers = new SimpleDeserializers();
}
_deserializers.addDeserializer(type, deser);
return this;
}
public SimpleModule addKeyDeserializer(Class type, KeyDeserializer deser)
{
if (_keyDeserializers == null) {
_keyDeserializers = new SimpleKeyDeserializers();
}
_keyDeserializers.addDeserializer(type, deser);
return this;
}
/**
* Lazily-constructed resolver used for storing mappings from
* abstract classes to more specific implementing classes
* (which may be abstract or concrete)
*/
public SimpleModule addAbstractTypeMapping(Class superType,
Class subType)
{
if (_abstractTypes == null) {
_abstractTypes = new SimpleAbstractTypeResolver();
}
// note: addMapping() will verify arguments
_abstractTypes = _abstractTypes.addMapping(superType, subType);
return this;
}
/**
* Method for registering {@link ValueInstantiator} to use when deserializing
* instances of type beanType.
*
* Instantiator is
* registered when module is registered for ObjectMapper.
*/
public SimpleModule addValueInstantiator(Class beanType, ValueInstantiator inst)
{
if (_valueInstantiators == null) {
_valueInstantiators = new SimpleValueInstantiators();
}
_valueInstantiators = _valueInstantiators.addValueInstantiator(beanType, inst);
return this;
}
/**
* Method for adding set of subtypes to be registered with
* {@link ObjectMapper}
* this is an alternative to using annotations in super type to indicate subtypes.
*/
public SimpleModule registerSubtypes(Class ... subtypes)
{
if (_subtypes == null) {
_subtypes = new LinkedHashSet(Math.max(16, subtypes.length));
}
for (Class subtype : subtypes) {
_subtypes.add(new NamedType(subtype));
}
return this;
}
/**
* Method for adding set of subtypes (along with type name to use) to be registered with
* {@link ObjectMapper}
* this is an alternative to using annotations in super type to indicate subtypes.
*/
public SimpleModule registerSubtypes(NamedType ... subtypes)
{
if (_subtypes == null) {
_subtypes = new LinkedHashSet(Math.max(16, subtypes.length));
}
for (NamedType subtype : subtypes) {
_subtypes.add(subtype);
}
return this;
}
/**
* Method for specifying that annotations define by mixinClass
* should be "mixed in" with annotations that targetType
* has (as if they were directly included on it!).
*
* Mix-in annotations are
* registered when module is registered for ObjectMapper.
*/
public SimpleModule setMixInAnnotation(Class targetType, Class mixinClass)
{
if (_mixins == null) {
_mixins = new HashMap, Class>();
}
_mixins.put(targetType, mixinClass);
return this;
}
/*
/**********************************************************
/* Module impl
/**********************************************************
*/
@Override
public String getModuleName() {
return _name;
}
/**
* Standard implementation handles registration of all configured
* customizations: it is important that sub-classes call this
* implementation (usually before additional custom logic)
* if they choose to override it; otherwise customizations
* will not be registered.
*/
@Override
public void setupModule(SetupContext context)
{
if (_serializers != null) {
context.addSerializers(_serializers);
}
if (_deserializers != null) {
context.addDeserializers(_deserializers);
}
if (_keySerializers != null) {
context.addKeySerializers(_keySerializers);
}
if (_keyDeserializers != null) {
context.addKeyDeserializers(_keyDeserializers);
}
if (_abstractTypes != null) {
context.addAbstractTypeResolver(_abstractTypes);
}
if (_valueInstantiators != null) {
context.addValueInstantiators(_valueInstantiators);
}
if (_deserializerModifier != null) {
context.addBeanDeserializerModifier(_deserializerModifier);
}
if (_serializerModifier != null) {
context.addBeanSerializerModifier(_serializerModifier);
}
if (_subtypes != null && _subtypes.size() > 0) {
context.registerSubtypes(_subtypes.toArray(new NamedType[_subtypes.size()]));
}
if (_namingStrategy != null) {
context.setNamingStrategy(_namingStrategy);
}
if (_mixins != null) {
for (Map.Entry,Class> entry : _mixins.entrySet()) {
context.setMixInAnnotations(entry.getKey(), entry.getValue());
}
}
}
@Override
public Version version() { return _version; }
}