package org.codehaus.jackson.map.ser;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.introspect.Annotated;
import org.codehaus.jackson.map.introspect.AnnotatedClass;
import org.codehaus.jackson.map.introspect.AnnotatedMethod;
import org.codehaus.jackson.map.introspect.BasicBeanDescription;
import org.codehaus.jackson.map.jsontype.NamedType;
import org.codehaus.jackson.map.jsontype.TypeResolverBuilder;
import org.codehaus.jackson.map.type.TypeFactory;
import org.codehaus.jackson.map.util.ClassUtil;
import org.codehaus.jackson.map.util.EnumValues;
import org.codehaus.jackson.map.util.Provider;
import org.codehaus.jackson.type.JavaType;
import org.codehaus.jackson.util.TokenBuffer;
/**
* Factory class that can provide serializers for standard JDK classes,
* as well as custom classes that extend standard classes or implement
* one of "well-known" interfaces (such as {@link java.util.Collection}).
*<p>
* Since all the serializers are eagerly instantiated, and there is
* no additional introspection or customizability of these types,
* this factory is stateless. This means that other delegating
* factories (or {@link SerializerProvider}s) can just use the
* shared singleton instance via static {@link #instance} field.
*/
public class BasicSerializerFactory
extends SerializerFactory
{
/*
/**********************************************************
/* Configuration, lookup tables/maps
/**********************************************************
*/
/**
* Since these are all JDK classes, we shouldn't have to worry
* about ClassLoader used to load them. Rather, we can just
* use the class name, and keep things simple and efficient.
*/
protected final static HashMap<String, JsonSerializer<?>> _concrete =
new HashMap<String, JsonSerializer<?>>();
/**
* Actually it may not make much sense to eagerly instantiate all
* kinds of serializers: so this Map actually contains class references,
* not instances
*
* @since 1.6
*/
protected final static HashMap<String, Class<? extends JsonSerializer<?>>> _concreteLazy =
new HashMap<String, Class<? extends JsonSerializer<?>>>();
/**
* There are also standard interfaces and abstract classes
* that we need to support without knowing conrecte implementation
* classes.
*/
protected final static ArrayList<SerializerMapping> _abstractSerializers =
new ArrayList<SerializerMapping>();
static {
/* String and string-like types (note: date types explicitly
* not included -- can use either textual or numeric serialization)
*/
_concrete.put(String.class.getName(), new StdSerializers.StringSerializer());
final ToStringSerializer sls = ToStringSerializer.instance;
_concrete.put(StringBuffer.class.getName(), sls);
_concrete.put(StringBuilder.class.getName(), sls);
_concrete.put(Character.class.getName(), sls);
_concrete.put(Character.TYPE.getName(), sls);
// Primitives/wrappers for primitives (primitives needed for Beans)
_concrete.put(Boolean.TYPE.getName(), new StdSerializers.BooleanSerializer(true));
_concrete.put(Boolean.class.getName(), new StdSerializers.BooleanSerializer(false));
final JsonSerializer<?> intS = new StdSerializers.IntegerSerializer();
_concrete.put(Integer.class.getName(), intS);
_concrete.put(Integer.TYPE.getName(), intS);
_concrete.put(Long.class.getName(), StdSerializers.LongSerializer.instance);
_concrete.put(Long.TYPE.getName(), StdSerializers.LongSerializer.instance);
_concrete.put(Byte.class.getName(), StdSerializers.IntLikeSerializer.instance);
_concrete.put(Byte.TYPE.getName(), StdSerializers.IntLikeSerializer.instance);
_concrete.put(Short.class.getName(), StdSerializers.IntLikeSerializer.instance);
_concrete.put(Short.TYPE.getName(), StdSerializers.IntLikeSerializer.instance);
// Numbers, limited length floating point
_concrete.put(Float.class.getName(), StdSerializers.FloatSerializer.instance);
_concrete.put(Float.TYPE.getName(), StdSerializers.FloatSerializer.instance);
_concrete.put(Double.class.getName(), StdSerializers.DoubleSerializer.instance);
_concrete.put(Double.TYPE.getName(), StdSerializers.DoubleSerializer.instance);
// Other numbers, more complicated
final JsonSerializer<?> ns = new StdSerializers.NumberSerializer();
_concrete.put(BigInteger.class.getName(), ns);
_concrete.put(BigDecimal.class.getName(), ns);
/* Other discrete non-container types:
* first, Date/Time zoo:
*/
_concrete.put(Calendar.class.getName(), StdSerializers.CalendarSerializer.instance);
_concrete.put(java.util.Date.class.getName(), StdSerializers.UtilDateSerializer.instance);
_concrete.put(java.sql.Date.class.getName(), new StdSerializers.SqlDateSerializer());
_concrete.put(java.sql.Time.class.getName(), new StdSerializers.SqlTimeSerializer());
// note: timestamps are very similar to java.util.Date, thus serialized as such
_concrete.put(java.sql.Timestamp.class.getName(), StdSerializers.UtilDateSerializer.instance);
// Arrays of various types (including common object types)
_concrete.put(boolean[].class.getName(), new ArraySerializers.BooleanArraySerializer());
_concrete.put(byte[].class.getName(), new ArraySerializers.ByteArraySerializer());
_concrete.put(char[].class.getName(), new ArraySerializers.CharArraySerializer());
_concrete.put(short[].class.getName(), new ArraySerializers.ShortArraySerializer());
_concrete.put(int[].class.getName(), new ArraySerializers.IntArraySerializer());
_concrete.put(long[].class.getName(), new ArraySerializers.LongArraySerializer());
_concrete.put(float[].class.getName(), new ArraySerializers.FloatArraySerializer());
_concrete.put(double[].class.getName(), new ArraySerializers.DoubleArraySerializer());
_concrete.put(Object[].class.getName(), ArraySerializers.ObjectArraySerializer.instance);
_concrete.put(String[].class.getName(), new ArraySerializers.StringArraySerializer());
// And then Java Collection classes
final ContainerSerializers.IndexedListSerializer indListS = ContainerSerializers.IndexedListSerializer.instance;
final ContainerSerializers.CollectionSerializer collectionS = ContainerSerializers.CollectionSerializer.instance;
_concrete.put(ArrayList.class.getName(), indListS);
_concrete.put(Vector.class.getName(), indListS);
_concrete.put(LinkedList.class.getName(), collectionS);
// (java.util.concurrent has others, but let's allow those to be
// found via slower introspection; too many to enumerate here)
final MapSerializer mapS = MapSerializer.instance;
_concrete.put(HashMap.class.getName(), mapS);
_concrete.put(Hashtable.class.getName(), mapS);
_concrete.put(LinkedHashMap.class.getName(), mapS);
_concrete.put(TreeMap.class.getName(), mapS);
_concrete.put(Properties.class.getName(), mapS);
_concrete.put(HashSet.class.getName(), collectionS);
_concrete.put(LinkedHashSet.class.getName(), collectionS);
_concrete.put(TreeSet.class.getName(), collectionS);
// And then other standard non-structured JDK types
for (Map.Entry<Class<?>,Object> en : new JdkSerializers().provide()) {
Object value = en.getValue();
if (value instanceof JsonSerializer<?>) {
_concrete.put(en.getKey().getName(), (JsonSerializer<?>) value);
} else if (value instanceof Class<?>) {
@SuppressWarnings("unchecked")
Class<? extends JsonSerializer<?>> cls = (Class<? extends JsonSerializer<?>>) value;
_concreteLazy.put(en.getKey().getName(), cls);
} else { // should never happen, but:
throw new IllegalStateException("Internal error: unrecognized value of type "+en.getClass().getName());
}
}
// Jackson-specific type(s)
// (Q: can this ever be sub-classed?)
_concreteLazy.put(TokenBuffer.class.getName(), StdSerializers.TokenBufferSerializer.class);
}
static {
/* 21-Nov-2009, tatu: Also, explicit support for basic Joda DateTime;
* and can use same mechanism for javax.xml.datatype types as well.
*/
for (String provStr : new String[] {
"org.codehaus.jackson.map.ext.CoreXMLSerializers"
,"org.codehaus.jackson.map.ext.JodaSerializers"
}) {
Object ob = null;
try {
ob = Class.forName(provStr).newInstance();
}
catch (LinkageError e) { }
// too many different kinds to enumerate here:
catch (Exception e) { }
if (ob != null) {
@SuppressWarnings("unchecked")
Provider<Map.Entry<Class<?>,JsonSerializer<?>>> prov =
(Provider<Map.Entry<Class<?>,JsonSerializer<?>>>) ob;
for (Map.Entry<Class<?>,JsonSerializer<?>> en : prov.provide()) {
/* 22-Nov-2009, tatu: For now this check suffices... may need
* to use other methods in future
*/
Class<?> cls = en.getKey();
if (ClassUtil.isConcrete(cls)) {
_concrete.put(en.getKey().getName(), en.getValue());
} else {
_abstractSerializers.add(new SerializerMapping(cls, en.getValue()));
}
}
}
}
}
/*
/**********************************************************
/* Life cycle
/**********************************************************
*/
/**
* Stateless global singleton instance that should be used
* for factories that want to use delegation to access
* standard serializers.
*/
public final static BasicSerializerFactory instance = new BasicSerializerFactory();
/**
* We will provide default constructor to allow sub-classing,
* but make it protected so that no non-singleton instances of
* the class will be instantiated.
*/
protected BasicSerializerFactory() { }
/*
/**********************************************************
/* SerializerFactory impl
/**********************************************************
*/
/**
* Main serializer constructor method. The base implementation within
* this class first calls a fast lookup method that can find serializers
* for well-known JDK classes; and if that fails, a slower one that
* tries to check out which interfaces given Class implements.
* Sub-classes can (and do) change this behavior to alter behavior.
*/
@Override
@SuppressWarnings("unchecked")
public <T> JsonSerializer<T> createSerializer(Class<T> type, SerializationConfig config)
{
return (JsonSerializer<T>) createSerializer(TypeFactory.type(type), config);
}
@Override
@SuppressWarnings("unchecked")
public JsonSerializer<Object> createSerializer(JavaType type, SerializationConfig config)
{
/* [JACKSON-220]: Very first thing, let's check annotations to
* see if we have explicit definition
*/
BasicBeanDescription beanDesc = config.introspect(type);
JsonSerializer<?> ser = findSerializerFromAnnotation(config, beanDesc.getClassInfo());
if (ser == null) {
// First, fast lookup for exact type:
ser = findSerializerByLookup(type, config, beanDesc);
if (ser == null) {
/* and should that fail, slower introspection methods; first
* one that deals with "primary" types
*/
ser = findSerializerByPrimaryType(type, config, beanDesc);
if (ser == null) {
// And if that fails, one with "secondary" traits:
ser = findSerializerByAddonType(type, config, beanDesc);
}
}
}
return (JsonSerializer<Object>)ser;
}
/**
* Method called to construct a type serializer for values with given declared
* base type. This is called for values other than those of bean property
* types.
*/
@Override
public TypeSerializer createTypeSerializer(JavaType baseType, SerializationConfig config)
{
BasicBeanDescription bean = config.introspectClassAnnotations(baseType.getRawClass());
AnnotatedClass ac = bean.getClassInfo();
AnnotationIntrospector ai = config.getAnnotationIntrospector();
TypeResolverBuilder<?> b = ai.findTypeResolver(ac, baseType);
/* Ok: if there is no explicit type info handler, we may want to
* use a default. If so, config object knows what to use.
*/
Collection<NamedType> subtypes = null;
if (b == null) {
b = config.getDefaultTyper(baseType);
} else {
subtypes = config.getSubtypeResolver().collectAndResolveSubtypes(ac, config, ai);
}
return (b == null) ? null : b.buildTypeSerializer(baseType, subtypes);
}
/*
/**********************************************************
/* Additional API for other core classes
/**********************************************************
*/
public final JsonSerializer<?> getNullSerializer() {
return NullSerializer.instance;
}
/*
/**********************************************************
/* Overridable secondary serializer accessor methods
/**********************************************************
*/
/**
* Fast lookup-based accessor method, which will only check for
* type itself, but not consider super-classes or implemented
* interfaces.
*/
public final JsonSerializer<?> findSerializerByLookup(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
String clsName = type.getRawClass().getName();
JsonSerializer<?> ser = _concrete.get(clsName);
if (ser == null) {
Class<? extends JsonSerializer<?>> serClass = _concreteLazy.get(clsName);
if (serClass != null) {
try {
ser = serClass.newInstance();
} catch (Exception e) {
throw new IllegalStateException("Failed to instantiate standard serializer (of type "+serClass.getName()+"): "
+e.getMessage(), e);
}
}
}
/* 08-Nov-2009, tatus: Some standard types may need customization;
* for now that just means Maps, but in future probably other
* collections as well. For strictly standard types this is
* currently only needed due to mix-in annotations.
*/
if (ser != null ) {
if (ser == MapSerializer.instance) {
return buildMapSerializer(type, config, beanDesc);
}
if (ser == ArraySerializers.ObjectArraySerializer.instance) {
return buildObjectArraySerializer(type, config, beanDesc);
}
if (ser == ContainerSerializers.IndexedListSerializer.instance) {
return buildIndexedListSerializer(type, config, beanDesc);
}
if (ser == ContainerSerializers.CollectionSerializer.instance) {
return buildCollectionSerializer(type, config, beanDesc);
}
}
return ser;
}
/**
* Reflection-based serialized find method, which checks if
* given class is a sub-type of one of well-known classes, or implements
* a "primary" interface. Primary here is defined as the main function
* of the Object; as opposed to "add-on" functionality.
*/
@SuppressWarnings("deprecation")
public final JsonSerializer<?> findSerializerByPrimaryType(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
Class<?> cls = type.getRawClass();
/* Some types are final, and hence not checked here (will
* have been handled by fast method above):
*
* - Boolean
* - String (StringBuffer, StringBuilder)
* - Arrays for primitive types
*
* But we do need to check for
*
* - "primary" interfaces: Enum, Number, JsonSerializable
* - Most collection types
* - java.lang.Number (but is that integral or not?)
*/
if (JsonSerializable.class.isAssignableFrom(cls)) {
if (JsonSerializableWithType.class.isAssignableFrom(cls)) {
return StdSerializers.SerializableWithTypeSerializer.instance;
}
return StdSerializers.SerializableSerializer.instance;
}
if (Map.class.isAssignableFrom(cls)) {
if (EnumMap.class.isAssignableFrom(cls)) {
return buildEnumMapSerializer(type, config, beanDesc);
}
return buildMapSerializer(type, config, beanDesc);
}
if (Object[].class.isAssignableFrom(cls)) {
return buildObjectArraySerializer(type, config, beanDesc);
}
if (List.class.isAssignableFrom(cls)) {
if (cls == List.class || cls == AbstractList.class || RandomAccess.class.isAssignableFrom(cls)) {
return buildIndexedListSerializer(type, config, beanDesc);
}
return buildCollectionSerializer(type, config, beanDesc);
}
// [JACKSON-193]: consider @JsonValue for enum types (and basically any type), so:
AnnotatedMethod valueMethod = beanDesc.findJsonValueMethod();
if (valueMethod != null) {
JsonSerializer<Object> ser = findSerializerFromAnnotation(config, valueMethod);
return new JsonValueSerializer(valueMethod.getAnnotated(), ser);
}
if (Number.class.isAssignableFrom(cls)) {
return StdSerializers.NumberSerializer.instance;
}
if (Enum.class.isAssignableFrom(cls)) {
@SuppressWarnings("unchecked")
Class<Enum<?>> enumClass = (Class<Enum<?>>) cls;
return EnumSerializer.construct(enumClass, config, beanDesc);
}
if (Calendar.class.isAssignableFrom(cls)) {
return StdSerializers.CalendarSerializer.instance;
}
if (java.util.Date.class.isAssignableFrom(cls)) {
return StdSerializers.UtilDateSerializer.instance;
}
for (int i = 0, len = _abstractSerializers.size(); i < len; ++i) {
SerializerMapping map = _abstractSerializers.get(i);
if (map.matches(cls)) {
return map.getSerializer();
}
}
if (Collection.class.isAssignableFrom(cls)) {
if (EnumSet.class.isAssignableFrom(cls)) {
return buildEnumSetSerializer(type, config, beanDesc);
}
return buildCollectionSerializer(type, config, beanDesc);
}
return null;
}
/**
* Reflection-based serialized find method, which checks if
* given class implements one of recognized "add-on" interfaces.
* Add-on here means a role that is usually or can be a secondary
* trait: for example,
* bean classes may implement {@link Iterable}, but their main
* function is usually something else. The reason for
*/
public final JsonSerializer<?> findSerializerByAddonType(JavaType javaType, SerializationConfig config,
BasicBeanDescription beanDesc)
{
Class<?> type = javaType.getRawClass();
// These need to be in decreasing order of specificity...
if (Iterator.class.isAssignableFrom(type)) {
return buildIteratorSerializer(javaType, config, beanDesc);
}
if (Iterable.class.isAssignableFrom(type)) {
return buildIterableSerializer(javaType, config, beanDesc);
}
if (CharSequence.class.isAssignableFrom(type)) {
return ToStringSerializer.instance;
}
return null;
}
/**
* Helper method called to check if a class or method
* has an annotation
* (@link org.codehaus.jackson.map.ser.JsonSerialize#using)
* that tells the class to use for serialization.
* Returns null if no such annotation found.
*/
@SuppressWarnings("unchecked")
protected JsonSerializer<Object> findSerializerFromAnnotation(SerializationConfig config, Annotated a)
{
Object serDef = config.getAnnotationIntrospector().findSerializer(a);
if (serDef != null) {
if (serDef instanceof JsonSerializer) {
return (JsonSerializer<Object>) serDef;
}
/* 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)) {
throw new IllegalStateException("AnnotationIntrospector returned value of type "+serDef.getClass().getName()+"; expected type JsonSerializer or Class<JsonSerializer> instead");
}
Class<?> cls = (Class<?>) serDef;
if (!JsonSerializer.class.isAssignableFrom(cls)) {
throw new IllegalStateException("AnnotationIntrospector returned Class "+cls.getName()+"; expected Class<JsonSerializer>");
}
return (JsonSerializer<Object>) ClassUtil.createInstance(cls, config.isEnabled(SerializationConfig.Feature.CAN_OVERRIDE_ACCESS_MODIFIERS));
}
return null;
}
/**
* Helper method that handles configuration details when constructing serializers for
* {@link java.util.Map} types.
*/
protected JsonSerializer<?> buildMapSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
AnnotationIntrospector intr = config.getAnnotationIntrospector();
JavaType valueType = type.getContentType();
TypeSerializer vts = createTypeSerializer(valueType, config);
boolean staticTyping = usesStaticTyping(config, beanDesc, vts);
return MapSerializer.construct(intr.findPropertiesToIgnore(beanDesc.getClassInfo()),
type, staticTyping, vts);
}
protected JsonSerializer<?> buildEnumMapSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
JavaType keyType = type.getKeyType();
JavaType valueType = type.getContentType();
// Need to find key enum values...
EnumValues enums = null;
if (keyType.isEnumType()) { // non-enum if we got it as type erased class (from instance)
@SuppressWarnings("unchecked")
Class<Enum<?>> enumClass = (Class<Enum<?>>) keyType.getRawClass();
enums = EnumValues.construct(enumClass, config.getAnnotationIntrospector());
}
TypeSerializer vts = createTypeSerializer(valueType, config);
return new EnumMapSerializer(valueType, usesStaticTyping(config, beanDesc, vts),
enums, vts);
}
/**
* Helper method that handles configuration details when constructing serializers for
* <code>Object[]</code> (and subtypes).
*/
protected JsonSerializer<?> buildObjectArraySerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
JavaType valueType = type.getContentType();
TypeSerializer vts = createTypeSerializer(valueType, config);
return ArraySerializers.objectArraySerializer(valueType,
usesStaticTyping(config, beanDesc, vts), vts);
}
protected JsonSerializer<?> buildIndexedListSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
JavaType valueType = type.getContentType();
TypeSerializer vts = createTypeSerializer(valueType, config);
return ContainerSerializers.indexedListSerializer(valueType,
usesStaticTyping(config, beanDesc, vts), vts);
}
protected JsonSerializer<?> buildCollectionSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
JavaType valueType = type.getContentType();
TypeSerializer vts = createTypeSerializer(valueType, config);
return ContainerSerializers.collectionSerializer(valueType,
usesStaticTyping(config, beanDesc, vts), vts);
}
protected JsonSerializer<?> buildIteratorSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
// if there's generic type, it'll be the first contained type
JavaType valueType = type.containedType(0);
if (valueType == null) {
valueType = TypeFactory.type(Object.class);
}
TypeSerializer vts = createTypeSerializer(valueType, config);
return ContainerSerializers.iteratorSerializer(valueType,
usesStaticTyping(config, beanDesc, vts), vts);
}
protected JsonSerializer<?> buildIterableSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
// if there's generic type, it'll be the first contained type
JavaType valueType = type.containedType(0);
if (valueType == null) {
valueType = TypeFactory.type(Object.class);
}
TypeSerializer vts = createTypeSerializer(valueType, config);
return ContainerSerializers.iterableSerializer(valueType,
usesStaticTyping(config, beanDesc, vts), vts);
}
protected JsonSerializer<?> buildEnumSetSerializer(JavaType type, SerializationConfig config,
BasicBeanDescription beanDesc)
{
// this may or may not be available (Class doesn't; type of field/method does)
JavaType enumType = type.getContentType();
// and even if nominally there is something, only use if it really is enum
if (!enumType.isEnumType()) {
enumType = null;
}
return ContainerSerializers.enumSetSerializer(enumType);
}
/**
* Helper method to check whether global settings and/or class
* annotations for the bean class indicate that static typing
* (declared types) should be used for properties.
* (instead of dynamic runtime types).
*/
protected boolean usesStaticTyping(SerializationConfig config,
BasicBeanDescription beanDesc,
TypeSerializer typeSer)
{
/* 16-Aug-2010, tatu: If there is a (value) type serializer, we can not force
* static typing; that would make it impossible to handle expected subtypes
*
*/
if (typeSer != null) {
return false;
}
JsonSerialize.Typing t = config.getAnnotationIntrospector().findSerializationTyping(beanDesc.getClassInfo());
if (t != null) {
return (t == JsonSerialize.Typing.STATIC);
}
return config.isEnabled(SerializationConfig.Feature.USE_STATIC_TYPING);
}
/*
/**********************************************************
/* Helper classes
/**********************************************************
*/
private final static class SerializerMapping
{
final Class<?> _class;
final JsonSerializer<?> _serializer;
public SerializerMapping(Class<?> c, JsonSerializer<?> ser) {
_class = c;
_serializer = ser;
}
public boolean matches(Class<?> c) {
return _class.isAssignableFrom(c);
}
public JsonSerializer<?> getSerializer() { return _serializer; }
}
}