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com.fasterxml.jackson.databind.ser.DefaultSerializerProvider Maven / Gradle / Ivy
General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.ser;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.atomic.AtomicReference;
import com.fasterxml.jackson.annotation.ObjectIdGenerator;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.cfg.HandlerInstantiator;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonschema.SchemaAware;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.impl.WritableObjectId;
import com.fasterxml.jackson.databind.util.ClassUtil;
/**
* Standard implementation used by {@link ObjectMapper}:
* adds methods only exposed to {@link ObjectMapper},
* as well as constructors.
*
* Note that class is abstract just because it does not
* define {@link #createInstance} method.
*
* Also note that all custom {@link SerializerProvider}
* implementations must sub-class this class: {@link ObjectMapper}
* requires this type, not basic provider type.
*/
public abstract class DefaultSerializerProvider
extends SerializerProvider
implements java.io.Serializable // since 2.1; only because ObjectWriter needs it
{
private static final long serialVersionUID = 1L;
/*
/**********************************************************
/* State, for non-blueprint instances
/**********************************************************
*/
/**
* Per-serialization map Object Ids that have seen so far, iff
* Object Id handling is enabled.
*/
protected transient Map _seenObjectIds;
protected transient ArrayList> _objectIdGenerators;
/**
* Generator used for serialization. Needed mostly for error reporting
* purposes.
*
* @since 2.8
*/
protected transient JsonGenerator _generator;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
protected DefaultSerializerProvider() { super(); }
protected DefaultSerializerProvider(SerializerProvider src,
SerializationConfig config,SerializerFactory f) {
super(src, config, f);
}
protected DefaultSerializerProvider(DefaultSerializerProvider src) {
super(src);
}
/**
* Method that sub-classes need to implement: used to create a non-blueprint instances
* from the blueprint.
* This is needed to retain state during serialization.
*/
public abstract DefaultSerializerProvider createInstance(SerializationConfig config,
SerializerFactory jsf);
/**
* Method needed to ensure that {@link ObjectMapper#copy} will work
* properly; specifically, that caches are cleared, but settings
* will otherwise remain identical; and that no sharing of state
* occurs.
*
* @since 2.5
*/
public DefaultSerializerProvider copy() {
throw new IllegalStateException("DefaultSerializerProvider sub-class not overriding copy()");
}
/*
/**********************************************************
/* Abstract method impls, factory methods
/**********************************************************
*/
@Override
public JsonSerializer serializerInstance(Annotated annotated, Object serDef)
throws JsonMappingException
{
if (serDef == null) {
return null;
}
JsonSerializer ser;
if (serDef instanceof JsonSerializer) {
ser = (JsonSerializer) serDef;
} else {
// Alas, there's no way to force return type of "either class
// X or Y" -- need to throw an exception after the fact
if (!(serDef instanceof Class)) {
reportBadDefinition(annotated.getType(),
"AnnotationIntrospector returned serializer definition of type "
+serDef.getClass().getName()+"; expected type JsonSerializer or Class instead");
}
Class serClass = (Class)serDef;
// there are some known "no class" markers to consider too:
if (serClass == JsonSerializer.None.class || ClassUtil.isBogusClass(serClass)) {
return null;
}
if (!JsonSerializer.class.isAssignableFrom(serClass)) {
reportBadDefinition(annotated.getType(),
"AnnotationIntrospector returned Class "
+serClass.getName()+"; expected Class");
}
HandlerInstantiator hi = _config.getHandlerInstantiator();
ser = (hi == null) ? null : hi.serializerInstance(_config, annotated, serClass);
if (ser == null) {
ser = (JsonSerializer) ClassUtil.createInstance(serClass,
_config.canOverrideAccessModifiers());
}
}
return (JsonSerializer) _handleResolvable(ser);
}
@Override
public Object includeFilterInstance(BeanPropertyDefinition forProperty,
Class filterClass)
{
if (filterClass == null) {
return null;
}
HandlerInstantiator hi = _config.getHandlerInstantiator();
Object filter = (hi == null) ? null : hi.includeFilterInstance(_config, forProperty, filterClass);
if (filter == null) {
filter = ClassUtil.createInstance(filterClass,
_config.canOverrideAccessModifiers());
}
return filter;
}
@Override
public boolean includeFilterSuppressNulls(Object filter) throws JsonMappingException
{
if (filter == null) {
return true;
}
// should let filter decide what to do with nulls:
// But just in case, let's handle unexpected (from our perspective) problems explicitly
try {
return filter.equals(null);
} catch (Exception e) {
String msg = String.format(
"Problem determining whether filter of type '%s' should filter out `null` values: (%s) %s",
filter.getClass().getName(), e.getClass().getName(), ClassUtil.exceptionMessage(e));
reportBadDefinition(filter.getClass(), msg, e);
return false; // never gets here
}
}
/*
/**********************************************************
/* Object Id handling
/**********************************************************
*/
@Override
public WritableObjectId findObjectId(Object forPojo, ObjectIdGenerator generatorType)
{
if (_seenObjectIds == null) {
_seenObjectIds = _createObjectIdMap();
} else {
WritableObjectId oid = _seenObjectIds.get(forPojo);
if (oid != null) {
return oid;
}
}
// Not seen yet; must add an entry, return it. For that, we need generator
ObjectIdGenerator generator = null;
if (_objectIdGenerators == null) {
_objectIdGenerators = new ArrayList>(8);
} else {
for (int i = 0, len = _objectIdGenerators.size(); i < len; ++i) {
ObjectIdGenerator gen = _objectIdGenerators.get(i);
if (gen.canUseFor(generatorType)) {
generator = gen;
break;
}
}
}
if (generator == null) {
generator = generatorType.newForSerialization(this);
_objectIdGenerators.add(generator);
}
WritableObjectId oid = new WritableObjectId(generator);
_seenObjectIds.put(forPojo, oid);
return oid;
}
/**
* Overridable helper method used for creating {@link java.util.Map}
* used for storing mappings from serializable objects to their
* Object Ids.
*
* @since 2.3
*/
protected Map _createObjectIdMap()
{
/* 06-Aug-2013, tatu: We may actually want to use equality,
* instead of identity... so:
*/
if (isEnabled(SerializationFeature.USE_EQUALITY_FOR_OBJECT_ID)) {
return new HashMap();
}
return new IdentityHashMap();
}
/*
/**********************************************************
/* Extended API: simple accesors
/**********************************************************
*/
/**
* Method that can be called to see if this serializer provider
* can find a serializer for an instance of given class.
*
* Note that no Exceptions are thrown, including unchecked ones:
* implementations are to swallow exceptions if necessary.
*/
public boolean hasSerializerFor(Class cls, AtomicReference cause)
{
// 07-Nov-2015, tatu: One special case, Object.class; will work only if
// empty beans are allowed or custom serializer registered. Easiest to
// check here.
if (cls == Object.class) {
if (!_config.isEnabled(SerializationFeature.FAIL_ON_EMPTY_BEANS)) {
return true;
}
}
try {
JsonSerializer ser = _findExplicitUntypedSerializer(cls);
return (ser != null);
} catch (JsonMappingException e) {
if (cause != null) {
cause.set(e);
}
} catch (RuntimeException e) {
if (cause == null) { // earlier behavior
throw e;
}
cause.set(e);
}
return false;
}
/**
* Accessor for the {@link JsonGenerator} currently in use for serializing
* content. Null for blueprint instances; non-null for actual active
* provider instances.
*
* @since 2.8
*/
@Override
public JsonGenerator getGenerator() {
return _generator;
}
/*
/**********************************************************
/* Extended API called by ObjectMapper: value serialization
/**********************************************************
*/
/**
* The method to be called by {@link ObjectMapper} and {@link ObjectWriter}
* for serializing given value, using serializers that
* this provider has access to (via caching and/or creating new serializers
* as need be).
*/
public void serializeValue(JsonGenerator gen, Object value) throws IOException
{
_generator = gen;
if (value == null) {
_serializeNull(gen);
return;
}
final Class cls = value.getClass();
// true, since we do want to cache root-level typed serializers (ditto for null property)
final JsonSerializer ser = findTypedValueSerializer(cls, true, null);
PropertyName rootName = _config.getFullRootName();
if (rootName == null) { // not explicitly specified
if (_config.isEnabled(SerializationFeature.WRAP_ROOT_VALUE)) {
_serialize(gen, value, ser, _config.findRootName(cls));
return;
}
} else if (!rootName.isEmpty()) {
_serialize(gen, value, ser, rootName);
return;
}
_serialize(gen, value, ser);
}
/**
* The method to be called by {@link ObjectMapper} and {@link ObjectWriter}
* for serializing given value (assumed to be of specified root type,
* instead of runtime type of value),
* using serializers that
* this provider has access to (via caching and/or creating new serializers
* as need be),
*
* @param rootType Type to use for locating serializer to use, instead of actual
* runtime type. Must be actual type, or one of its super types
*/
public void serializeValue(JsonGenerator gen, Object value, JavaType rootType) throws IOException
{
_generator = gen;
if (value == null) {
_serializeNull(gen);
return;
}
// Let's ensure types are compatible at this point
if (!rootType.getRawClass().isAssignableFrom(value.getClass())) {
_reportIncompatibleRootType(value, rootType);
}
// root value, not reached via property:
JsonSerializer ser = findTypedValueSerializer(rootType, true, null);
PropertyName rootName = _config.getFullRootName();
if (rootName == null) { // not explicitly specified
if (_config.isEnabled(SerializationFeature.WRAP_ROOT_VALUE)) {
_serialize(gen, value, ser, _config.findRootName(rootType));
return;
}
} else if (!rootName.isEmpty()) {
_serialize(gen, value, ser, rootName);
return;
}
_serialize(gen, value, ser);
}
/**
* The method to be called by {@link ObjectWriter}
* for serializing given value (assumed to be of specified root type,
* instead of runtime type of value), when it may know specific
* {@link JsonSerializer} to use.
*
* @param rootType Type to use for locating serializer to use, instead of actual
* runtime type, if no serializer is passed
* @param ser Root Serializer to use, if not null
*
* @since 2.1
*/
public void serializeValue(JsonGenerator gen, Object value, JavaType rootType,
JsonSerializer ser) throws IOException
{
_generator = gen;
if (value == null) {
_serializeNull(gen);
return;
}
// Let's ensure types are compatible at this point
if ((rootType != null) && !rootType.getRawClass().isAssignableFrom(value.getClass())) {
_reportIncompatibleRootType(value, rootType);
}
// root value, not reached via property:
if (ser == null) {
ser = findTypedValueSerializer(rootType, true, null);
}
PropertyName rootName = _config.getFullRootName();
if (rootName == null) { // not explicitly specified
if (_config.isEnabled(SerializationFeature.WRAP_ROOT_VALUE)) {
rootName = (rootType == null)
? _config.findRootName(value.getClass())
: _config.findRootName(rootType);
_serialize(gen, value, ser, rootName);
return;
}
} else if (!rootName.isEmpty()) {
_serialize(gen, value, ser, rootName);
return;
}
_serialize(gen, value, ser);
}
/**
* Alternate serialization call used for polymorphic types, when {@link TypeSerializer}
* is already known, but the actual serializer may or may not be.
*
* @since 2.6
*/
public void serializePolymorphic(JsonGenerator gen, Object value, JavaType rootType,
JsonSerializer valueSer, TypeSerializer typeSer)
throws IOException
{
_generator = gen;
if (value == null) {
_serializeNull(gen);
return;
}
// Let's ensure types are compatible at this point
if ((rootType != null) && !rootType.getRawClass().isAssignableFrom(value.getClass())) {
_reportIncompatibleRootType(value, rootType);
}
/* 12-Jun-2015, tatu: nominal root type is necessary for Maps at least;
* possibly collections, but can cause problems for other polymorphic
* types. We really need to distinguish between serialization type,
* base type; but right we don't. Hence this check
*/
if (valueSer == null) {
if ((rootType != null) && rootType.isContainerType()) {
valueSer = findValueSerializer(rootType, null);
} else {
valueSer = findValueSerializer(value.getClass(), null);
}
}
final boolean wrap;
PropertyName rootName = _config.getFullRootName();
if (rootName == null) {
wrap = _config.isEnabled(SerializationFeature.WRAP_ROOT_VALUE);
if (wrap) {
gen.writeStartObject();
PropertyName pname = _config.findRootName(value.getClass());
gen.writeFieldName(pname.simpleAsEncoded(_config));
}
} else if (rootName.isEmpty()) {
wrap = false;
} else {
wrap = true;
gen.writeStartObject();
gen.writeFieldName(rootName.getSimpleName());
}
try {
valueSer.serializeWithType(value, gen, this, typeSer);
if (wrap) {
gen.writeEndObject();
}
} catch (Exception e) {
throw _wrapAsIOE(gen, e);
}
}
private final void _serialize(JsonGenerator gen, Object value,
JsonSerializer ser, PropertyName rootName)
throws IOException
{
try {
gen.writeStartObject();
gen.writeFieldName(rootName.simpleAsEncoded(_config));
ser.serialize(value, gen, this);
gen.writeEndObject();
} catch (Exception e) {
throw _wrapAsIOE(gen, e);
}
}
private final void _serialize(JsonGenerator gen, Object value,
JsonSerializer ser)
throws IOException
{
try {
ser.serialize(value, gen, this);
} catch (Exception e) {
throw _wrapAsIOE(gen, e);
}
}
/**
* Helper method called when root value to serialize is null
*
* @since 2.3
*/
protected void _serializeNull(JsonGenerator gen) throws IOException
{
JsonSerializer ser = getDefaultNullValueSerializer();
try {
ser.serialize(null, gen, this);
} catch (Exception e) {
throw _wrapAsIOE(gen, e);
}
}
private IOException _wrapAsIOE(JsonGenerator g, Exception e) {
if (e instanceof IOException) {
return (IOException) e;
}
String msg = ClassUtil.exceptionMessage(e);
if (msg == null) {
msg = "[no message for "+e.getClass().getName()+"]";
}
return new JsonMappingException(g, msg, e);
}
/*
/********************************************************
/* Access to caching details
/********************************************************
*/
/**
* Method that can be used to determine how many serializers this
* provider is caching currently
* (if it does caching: default implementation does)
* Exact count depends on what kind of serializers get cached;
* default implementation caches all serializers, including ones that
* are eagerly constructed (for optimal access speed)
*
* The main use case for this method is to allow conditional flushing of
* serializer cache, if certain number of entries is reached.
*/
public int cachedSerializersCount() {
return _serializerCache.size();
}
/**
* Method that will drop all serializers currently cached by this provider.
* This can be used to remove memory usage (in case some serializers are
* only used once or so), or to force re-construction of serializers after
* configuration changes for mapper than owns the provider.
*/
public void flushCachedSerializers() {
_serializerCache.flush();
}
/*
/**********************************************************
/* Extended API called by ObjectMapper: other
/**********************************************************
*/
/**
* The method to be called by {@link ObjectMapper} and {@link ObjectWriter}
* to to expose the format of the given to to the given visitor
*
* @param javaType The type for which to generate format
* @param visitor the visitor to accept the format
*/
public void acceptJsonFormatVisitor(JavaType javaType, JsonFormatVisitorWrapper visitor)
throws JsonMappingException
{
if (javaType == null) {
throw new IllegalArgumentException("A class must be provided");
}
/* no need for embedded type information for JSON schema generation (all
* type information it needs is accessible via "untyped" serializer)
*/
visitor.setProvider(this);
findValueSerializer(javaType, null).acceptJsonFormatVisitor(visitor, javaType);
}
/**
* The method to be called by {@link ObjectMapper}
* to generate JSON schema for
* given type.
*
* @param type The type for which to generate schema
*
* @deprecated Should not be used any more
*/
@Deprecated // since 2.6
public com.fasterxml.jackson.databind.jsonschema.JsonSchema generateJsonSchema(Class type)
throws JsonMappingException
{
/* no need for embedded type information for JSON schema generation (all
* type information it needs is accessible via "untyped" serializer)
*/
JsonSerializer ser = findValueSerializer(type, null);
JsonNode schemaNode = (ser instanceof SchemaAware) ?
((SchemaAware) ser).getSchema(this, null) : com.fasterxml.jackson.databind.jsonschema.JsonSchema.getDefaultSchemaNode();
if (!(schemaNode instanceof ObjectNode)) {
throw new IllegalArgumentException("Class " + type.getName()
+" would not be serialized as a JSON object and therefore has no schema");
}
return new com.fasterxml.jackson.databind.jsonschema.JsonSchema((ObjectNode) schemaNode);
}
/*
/**********************************************************
/* Helper classes
/**********************************************************
*/
/**
* Concrete implementation that defines factory method(s),
* defined as final.
*/
public final static class Impl extends DefaultSerializerProvider {
private static final long serialVersionUID = 1L;
public Impl() { super(); }
public Impl(Impl src) { super(src); }
protected Impl(SerializerProvider src, SerializationConfig config,
SerializerFactory f) {
super(src, config, f);
}
@Override
public DefaultSerializerProvider copy()
{
if (getClass() != Impl.class) {
return super.copy();
}
return new Impl(this);
}
@Override
public Impl createInstance(SerializationConfig config, SerializerFactory jsf) {
return new Impl(this, config, jsf);
}
}
}
