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package com.fasterxml.jackson.databind.type;
import java.util.*;
import java.lang.reflect.*;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.util.ArrayBuilders;
import com.fasterxml.jackson.databind.util.LRUMap;
/**
* Class used for creating concrete {@link JavaType} instances,
* given various inputs.
*
* Instances of this class are accessible using {@link com.fasterxml.jackson.databind.ObjectMapper}
* as well as many objects it constructs (like
* {@link com.fasterxml.jackson.databind.DeserializationConfig} and
* {@link com.fasterxml.jackson.databind.SerializationConfig})),
* but usually those objects also
* expose convenience methods (constructType).
* So, you can do for example:
*
* JavaType stringType = mapper.constructType(String.class);
*
* However, more advanced methods are only exposed by factory so that you
* may need to use:
*
* JavaType stringCollection = mapper.getTypeFactory().constructCollectionType(List.class, String.class);
*
*/
@SuppressWarnings({"rawtypes", "unchecked"})
public final class TypeFactory
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
private final static JavaType[] NO_TYPES = new JavaType[0];
/**
* Globally shared singleton. Not accessed directly; non-core
* code should use per-ObjectMapper instance (via configuration objects).
* Core Jackson code uses {@link #defaultInstance} for accessing it.
*/
protected final static TypeFactory instance = new TypeFactory();
/*
/**********************************************************
/* Caching
/**********************************************************
*/
// // // Let's assume that a small set of core primitive/basic types
// // // will not be modified, and can be freely shared to streamline
// // // parts of processing
protected final static SimpleType CORE_TYPE_STRING = new SimpleType(String.class);
protected final static SimpleType CORE_TYPE_BOOL = new SimpleType(Boolean.TYPE);
protected final static SimpleType CORE_TYPE_INT = new SimpleType(Integer.TYPE);
protected final static SimpleType CORE_TYPE_LONG = new SimpleType(Long.TYPE);
/**
* Since type resolution can be expensive (specifically when resolving
* actual generic types), we will use small cache to avoid repetitive
* resolution of core types
*/
protected final LRUMap _typeCache = new LRUMap(16, 100);
/*
* Looks like construction of {@link JavaType} instances can be
* a bottleneck, esp. for root-level Maps, so we better do bit
* of low-level component caching here...
*/
/**
* Lazily constructed copy of type hierarchy from {@link java.util.HashMap}
* to its supertypes.
*/
protected transient HierarchicType _cachedHashMapType;
/**
* Lazily constructed copy of type hierarchy from {@link java.util.ArrayList}
* to its supertypes.
*/
protected transient HierarchicType _cachedArrayListType;
/*
/**********************************************************
/* Configuration
/**********************************************************
*/
/**
* Registered {@link TypeModifier}s: objects that can change details
* of {@link JavaType} instances factory constructs.
*/
protected final TypeModifier[] _modifiers;
protected final TypeParser _parser;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
private TypeFactory() {
_parser = new TypeParser(this);
_modifiers = null;
}
protected TypeFactory(TypeParser p, TypeModifier[] mods) {
_parser = p;
_modifiers = mods;
}
public TypeFactory withModifier(TypeModifier mod)
{
if (mod == null) { // mostly for unit tests
return new TypeFactory(_parser, _modifiers);
}
if (_modifiers == null) {
return new TypeFactory(_parser, new TypeModifier[] { mod });
}
return new TypeFactory(_parser, ArrayBuilders.insertInListNoDup(_modifiers, mod));
}
/**
* Method used to access the globally shared instance, which has
* no custom configuration. Used by ObjectMapper to
* get the default factory when constructed.
*/
public static TypeFactory defaultInstance() { return instance; }
/**
* Method that will clear up any cached type definitions that may
* be cached by this {@link TypeFactory} instance.
* This method should not be commonly used, that is, only use it
* if you know there is a problem with retention of type definitions;
* the most likely (and currently only known) problem is retention
* of {@link Class} instances via {@link JavaType} reference.
*
* @since 2.4.1
*/
public void clearCache() {
_typeCache.clear();
}
/*
/**********************************************************
/* Static methods for non-instance-specific functionality
/**********************************************************
*/
/**
* Method for constructing a marker type that indicates missing generic
* type information, which is handled same as simple type for
* java.lang.Object.
*/
public static JavaType unknownType() {
return defaultInstance()._unknownType();
}
/**
* Static helper method that can be called to figure out type-erased
* call for given JDK type. It can be called statically since type resolution
* process can never change actual type-erased class; thereby static
* default instance is used for determination.
*/
public static Class rawClass(Type t) {
if (t instanceof Class) {
return (Class) t;
}
// Shouldbe able to optimize bit more in future...
return defaultInstance().constructType(t).getRawClass();
}
/*
/**********************************************************
/* Type conversion, parameterization resolution methods
/**********************************************************
*/
/**
* Factory method for creating a subtype of given base type, as defined
* by specified subclass; but retaining generic type information if any.
* Can be used, for example, to get equivalent of "HashMap<String,Integer>"
* from "Map<String,Integer>" by giving HashMap.class
* as subclass.
*/
public JavaType constructSpecializedType(JavaType baseType, Class subclass)
{
// simple optimization to avoid costly introspection if type-erased type does NOT differ
if (baseType.getRawClass() == subclass) {
return baseType;
}
// Currently only SimpleType instances can become something else
if (baseType instanceof SimpleType) {
// and only if subclass is an array, Collection or Map
if (subclass.isArray()
|| Map.class.isAssignableFrom(subclass)
|| Collection.class.isAssignableFrom(subclass)) {
// need to assert type compatibility...
if (!baseType.getRawClass().isAssignableFrom(subclass)) {
throw new IllegalArgumentException("Class "+subclass.getClass().getName()+" not subtype of "+baseType);
}
// this _should_ work, right?
JavaType subtype = _fromClass(subclass, new TypeBindings(this, baseType.getRawClass()));
// one more thing: handlers to copy?
Object h = baseType.getValueHandler();
if (h != null) {
subtype = subtype.withValueHandler(h);
}
h = baseType.getTypeHandler();
if (h != null) {
subtype = subtype.withTypeHandler(h);
}
return subtype;
}
}
// otherwise regular narrowing should work just fine
return baseType.narrowBy(subclass);
}
/**
* Factory method for constructing a {@link JavaType} out of its canonical
* representation (see {@link JavaType#toCanonical()}).
*
* @param canonical Canonical string representation of a type
*
* @throws IllegalArgumentException If canonical representation is malformed,
* or class that type represents (including its generic parameters) is
* not found
*/
public JavaType constructFromCanonical(String canonical) throws IllegalArgumentException
{
return _parser.parse(canonical);
}
/**
* Method that is to figure out actual type parameters that given
* class binds to generic types defined by given (generic)
* interface or class.
* This could mean, for example, trying to figure out
* key and value types for Map implementations.
*
* @param type Sub-type (leaf type) that implements expType
*/
public JavaType[] findTypeParameters(JavaType type, Class expType)
{
/* Tricky part here is that some JavaType instances have been constructed
* from generic type (usually via TypeReference); and in those case
* types have been resolved. Alternative is that the leaf type is type-erased
* class, in which case this has not been done.
* For now simplest way to handle this is to split processing in two: latter
* case actually fully works; and former mostly works. In future may need to
* rewrite former part, which requires changes to JavaType as well.
*/
if (expType == type.getParameterSource()) {
// Direct type info; good since we can return it as is
int count = type.containedTypeCount();
if (count == 0) return null;
JavaType[] result = new JavaType[count];
for (int i = 0; i < count; ++i) {
result[i] = type.containedType(i);
}
return result;
}
/* Otherwise need to go through type-erased class. This may miss cases where
* we get generic type; ideally JavaType/SimpleType would retain information
* about generic declaration at main level... but let's worry about that
* if/when there are problems; current handling is an improvement over earlier
* code.
*/
Class raw = type.getRawClass();
return findTypeParameters(raw, expType, new TypeBindings(this, type));
}
public JavaType[] findTypeParameters(Class clz, Class expType) {
return findTypeParameters(clz, expType, new TypeBindings(this, clz));
}
public JavaType[] findTypeParameters(Class clz, Class expType, TypeBindings bindings)
{
// First: find full inheritance chain
HierarchicType subType = _findSuperTypeChain(clz, expType);
// Caller is supposed to ensure this never happens, so:
if (subType == null) {
throw new IllegalArgumentException("Class "+clz.getName()+" is not a subtype of "+expType.getName());
}
// Ok and then go to the ultimate super-type:
HierarchicType superType = subType;
while (superType.getSuperType() != null) {
superType = superType.getSuperType();
Class raw = superType.getRawClass();
TypeBindings newBindings = new TypeBindings(this, raw);
if (superType.isGeneric()) { // got bindings, need to resolve
ParameterizedType pt = superType.asGeneric();
Type[] actualTypes = pt.getActualTypeArguments();
TypeVariable[] vars = raw.getTypeParameters();
int len = actualTypes.length;
for (int i = 0; i < len; ++i) {
String name = vars[i].getName();
JavaType type = _constructType(actualTypes[i], bindings);
newBindings.addBinding(name, type);
}
}
bindings = newBindings;
}
// which ought to be generic (if not, it's raw type)
if (!superType.isGeneric()) {
return null;
}
return bindings.typesAsArray();
}
/**
* Method that can be called to figure out more specific of two
* types (if they are related; that is, one implements or extends the
* other); or if not related, return the primary type.
*
* @param type1 Primary type to consider
* @param type2 Secondary type to consider
*
* @since 2.2
*/
public JavaType moreSpecificType(JavaType type1, JavaType type2)
{
if (type1 == null) {
return type2;
}
if (type2 == null) {
return type1;
}
Class raw1 = type1.getRawClass();
Class raw2 = type2.getRawClass();
if (raw1 == raw2) {
return type1;
}
// TODO: maybe try sub-classing, to retain generic types?
if (raw1.isAssignableFrom(raw2)) {
return type2;
}
return type1;
}
/*
/**********************************************************
/* Public factory methods
/**********************************************************
*/
public JavaType constructType(Type type) {
return _constructType(type, null);
}
public JavaType constructType(Type type, TypeBindings bindings) {
return _constructType(type, bindings);
}
public JavaType constructType(TypeReference typeRef) {
return _constructType(typeRef.getType(), null);
}
public JavaType constructType(Type type, Class context) {
TypeBindings b = (context == null) ? null : new TypeBindings(this, context);
return _constructType(type, b);
}
public JavaType constructType(Type type, JavaType context) {
TypeBindings b = (context == null) ? null : new TypeBindings(this, context);
return _constructType(type, b);
}
/**
* Factory method that can be used if type information is passed
* as Java typing returned from getGenericXxx methods
* (usually for a return or argument type).
*/
protected JavaType _constructType(Type type, TypeBindings context)
{
JavaType resultType;
// simple class?
if (type instanceof Class) {
resultType = _fromClass((Class) type, context);
}
// But if not, need to start resolving.
else if (type instanceof ParameterizedType) {
resultType = _fromParamType((ParameterizedType) type, context);
}
else if (type instanceof JavaType) { // [Issue#116]
return (JavaType) type;
}
else if (type instanceof GenericArrayType) {
resultType = _fromArrayType((GenericArrayType) type, context);
}
else if (type instanceof TypeVariable) {
resultType = _fromVariable((TypeVariable) type, context);
}
else if (type instanceof WildcardType) {
resultType = _fromWildcard((WildcardType) type, context);
} else {
// sanity check
throw new IllegalArgumentException("Unrecognized Type: "+((type == null) ? "[null]" : type.toString()));
}
/* [JACKSON-521]: Need to allow TypeModifiers to alter actual type; however,
* for now only call for simple types (i.e. not for arrays, map or collections).
* Can be changed in future it necessary
*/
if (_modifiers != null && !resultType.isContainerType()) {
for (TypeModifier mod : _modifiers) {
resultType = mod.modifyType(resultType, type, context, this);
}
}
return resultType;
}
/*
/**********************************************************
/* Direct factory methods
/**********************************************************
*/
/**
* Method for constructing an {@link ArrayType}.
*
* NOTE: type modifiers are NOT called on array type itself; but are called
* for element type (and other contained types)
*/
public ArrayType constructArrayType(Class elementType) {
return ArrayType.construct(_constructType(elementType, null), null, null);
}
/**
* Method for constructing an {@link ArrayType}.
*
* NOTE: type modifiers are NOT called on array type itself; but are called
* for contained types.
*/
public ArrayType constructArrayType(JavaType elementType) {
return ArrayType.construct(elementType, null, null);
}
/**
* Method for constructing a {@link CollectionType}.
*
* NOTE: type modifiers are NOT called on Collection type itself; but are called
* for contained types.
*/
public CollectionType constructCollectionType(Class collectionClass, Class elementClass) {
return CollectionType.construct(collectionClass, constructType(elementClass));
}
/**
* Method for constructing a {@link CollectionType}.
*
* NOTE: type modifiers are NOT called on Collection type itself; but are called
* for contained types.
*/
public CollectionType constructCollectionType(Class collectionClass, JavaType elementType) {
return CollectionType.construct(collectionClass, elementType);
}
/**
* Method for constructing a {@link CollectionLikeType}.
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public CollectionLikeType constructCollectionLikeType(Class collectionClass, Class elementClass) {
return CollectionLikeType.construct(collectionClass, constructType(elementClass));
}
/**
* Method for constructing a {@link CollectionLikeType}.
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public CollectionLikeType constructCollectionLikeType(Class collectionClass, JavaType elementType) {
return CollectionLikeType.construct(collectionClass, elementType);
}
/**
* Method for constructing a {@link MapType} instance
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public MapType constructMapType(Class mapClass, JavaType keyType, JavaType valueType) {
return MapType.construct(mapClass, keyType, valueType);
}
/**
* Method for constructing a {@link MapType} instance
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public MapType constructMapType(Class mapClass, Class keyClass, Class valueClass) {
return MapType.construct(mapClass, constructType(keyClass), constructType(valueClass));
}
/**
* Method for constructing a {@link MapLikeType} instance
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public MapLikeType constructMapLikeType(Class mapClass, JavaType keyType, JavaType valueType) {
return MapLikeType.construct(mapClass, keyType, valueType);
}
/**
* Method for constructing a {@link MapLikeType} instance
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*/
public MapLikeType constructMapLikeType(Class mapClass, Class keyClass, Class valueClass) {
return MapType.construct(mapClass, constructType(keyClass), constructType(valueClass));
}
/**
* Method for constructing a type instance with specified parameterization.
*
* @deprecated Since 2.5, use variant that takes one more argument
*/
@Deprecated
public JavaType constructSimpleType(Class rawType, JavaType[] parameterTypes) {
return constructSimpleType(rawType, rawType, parameterTypes);
}
public JavaType constructSimpleType(Class rawType, Class parameterTarget,
JavaType[] parameterTypes)
{
// Quick sanity check: must match numbers of types with expected...
TypeVariable[] typeVars = parameterTarget.getTypeParameters();
if (typeVars.length != parameterTypes.length) {
throw new IllegalArgumentException("Parameter type mismatch for "+rawType.getName()
+" (and target "+parameterTarget.getName()+"): expected "+typeVars.length
+" parameters, was given "+parameterTypes.length);
}
String[] names = new String[typeVars.length];
for (int i = 0, len = typeVars.length; i < len; ++i) {
names[i] = typeVars[i].getName();
}
return new SimpleType(rawType, names, parameterTypes, null, null, false, parameterTarget);
}
/**
* Method that will force construction of a simple type, without trying to
* check for more specialized types.
*
* NOTE: no type modifiers are called on type either, so calling this method
* should only be used if caller really knows what it's doing...
*/
public JavaType uncheckedSimpleType(Class cls) {
return new SimpleType(cls);
}
/**
* Factory method for constructing {@link JavaType} that
* represents a parameterized type. For example, to represent
* type List<Set<Integer>>, you could
* call
*
* TypeFactory.parametricType(List.class, Integer.class);
*
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*
* @param parametrized Type-erased type of instance being constructed
* @param parametersFor class or interface for which type parameters are applied; either
* parametrized or one of its supertypes
* @param parameterClasses Type parameters to apply
*
* @since 2.5
*/
public JavaType constructParametrizedType(Class parametrized, Class parametersFor,
Class... parameterClasses)
{
int len = parameterClasses.length;
JavaType[] pt = new JavaType[len];
for (int i = 0; i < len; ++i) {
pt[i] = _fromClass(parameterClasses[i], null);
}
return constructParametrizedType(parametrized, parametersFor, pt);
}
/**
* @deprecated Since 2.5, use {@link #constructParametrizedType} instead.
*/
@Deprecated
public JavaType constructParametricType(Class parametrized, Class... parameterClasses) {
return constructParametrizedType(parametrized, parametrized, parameterClasses);
}
/**
* Factory method for constructing {@link JavaType} that
* represents a parameterized type. For example, to represent
* type List<Set<Integer>>, you could
* call
*
* JavaType inner = TypeFactory.parametricType(Set.class, Integer.class);
* TypeFactory.parametricType(List.class, inner);
*
*
* NOTE: type modifiers are NOT called on constructed type itself; but are called
* for contained types.
*
*
* @param parametrized Actual full type
* @param parametersFor class or interface for which type parameters are applied; either
* parametrized or one of its supertypes
* @param parameterTypes Type parameters to apply
*
* @since 2.5
*/
public JavaType constructParametrizedType(Class parametrized, Class parametersFor,
JavaType... parameterTypes)
{
JavaType resultType;
// Need to check kind of class we are dealing with...
if (parametrized.isArray()) {
// 19-Jan-2010, tatus: should we support multi-dimensional arrays directly?
if (parameterTypes.length != 1) {
throw new IllegalArgumentException("Need exactly 1 parameter type for arrays ("+parametrized.getName()+")");
}
resultType = constructArrayType(parameterTypes[0]);
}
else if (Map.class.isAssignableFrom(parametrized)) {
if (parameterTypes.length != 2) {
throw new IllegalArgumentException("Need exactly 2 parameter types for Map types ("+parametrized.getName()+")");
}
resultType = constructMapType((Class>)parametrized, parameterTypes[0], parameterTypes[1]);
}
else if (Collection.class.isAssignableFrom(parametrized)) {
if (parameterTypes.length != 1) {
throw new IllegalArgumentException("Need exactly 1 parameter type for Collection types ("+parametrized.getName()+")");
}
resultType = constructCollectionType((Class>)parametrized, parameterTypes[0]);
} else {
resultType = constructSimpleType(parametrized, parametersFor, parameterTypes);
}
return resultType;
}
/**
* @deprecated Since 2.5, use {@link #constructParametrizedType} instead.
*/
@Deprecated
public JavaType constructParametricType(Class parametrized, JavaType... parameterTypes) {
return constructParametrizedType(parametrized, parametrized, parameterTypes);
}
/*
/**********************************************************
/* Direct factory methods for "raw" variants, used when
/* parameterization is unknown
/**********************************************************
*/
/**
* Method that can be used to construct "raw" Collection type; meaning that its
* parameterization is unknown.
* This is similar to using Object.class parameterization,
* and is equivalent to calling:
*
* typeFactory.constructCollectionType(collectionClass, typeFactory.unknownType());
*
*
* This method should only be used if parameterization is completely unavailable.
*/
public CollectionType constructRawCollectionType(Class collectionClass) {
return CollectionType.construct(collectionClass, unknownType());
}
/**
* Method that can be used to construct "raw" Collection-like type; meaning that its
* parameterization is unknown.
* This is similar to using Object.class parameterization,
* and is equivalent to calling:
*
* typeFactory.constructCollectionLikeType(collectionClass, typeFactory.unknownType());
*
*
* This method should only be used if parameterization is completely unavailable.
*/
public CollectionLikeType constructRawCollectionLikeType(Class collectionClass) {
return CollectionLikeType.construct(collectionClass, unknownType());
}
/**
* Method that can be used to construct "raw" Map type; meaning that its
* parameterization is unknown.
* This is similar to using Object.class parameterization,
* and is equivalent to calling:
*
* typeFactory.constructMapType(collectionClass, typeFactory.unknownType(), typeFactory.unknownType());
*
*
* This method should only be used if parameterization is completely unavailable.
*/
public MapType constructRawMapType(Class mapClass) {
return MapType.construct(mapClass, unknownType(), unknownType());
}
/**
* Method that can be used to construct "raw" Map-like type; meaning that its
* parameterization is unknown.
* This is similar to using Object.class parameterization,
* and is equivalent to calling:
*
* typeFactory.constructMapLikeType(collectionClass, typeFactory.unknownType(), typeFactory.unknownType());
*
*
* This method should only be used if parameterization is completely unavailable.
*/
public MapLikeType constructRawMapLikeType(Class mapClass) {
return MapLikeType.construct(mapClass, unknownType(), unknownType());
}
/*
/**********************************************************
/* Actual factory methods
/**********************************************************
*/
/**
* @param context Mapping of formal parameter declarations (for generic
* types) into actual types
*/
protected JavaType _fromClass(Class clz, TypeBindings context)
{
// Very first thing: small set of core types we know well:
if (clz == String.class) return CORE_TYPE_STRING;
if (clz == Boolean.TYPE) return CORE_TYPE_BOOL;
if (clz == Integer.TYPE) return CORE_TYPE_INT;
if (clz == Long.TYPE) return CORE_TYPE_LONG;
// Barring that, we may have recently constructed an instance:
ClassKey key = new ClassKey(clz);
JavaType result = _typeCache.get(key); // ok, cache object is synced
if (result != null) {
return result;
}
// If context was needed, weed do:
/*
if (context == null) {
context = new TypeBindings(this, cls);
}
*/
// First: do we have an array type?
if (clz.isArray()) {
result = ArrayType.construct(_constructType(clz.getComponentType(), null), null, null);
/* Also: although enums can also be fully resolved, there's little
* point in doing so (T extends Enum) etc.
*/
} else if (clz.isEnum()) {
result = new SimpleType(clz);
/* Maps and Collections aren't quite as hot; problem is, due
* to type erasure we often do not know typing and can only assume
* base Object.
*/
} else if (Map.class.isAssignableFrom(clz)) {
result = _mapType(clz);
} else if (Collection.class.isAssignableFrom(clz)) {
result = _collectionType(clz);
} else {
// 29-Sep-2014, tatu: We may want to pre-resolve well-known generic types
if (Map.Entry.class.isAssignableFrom(clz)) {
JavaType[] pts = this.findTypeParameters(clz, Map.Entry.class);
JavaType kt, vt;
if (pts == null || pts.length != 2) {
kt = vt = unknownType();
} else {
kt = pts[0];
vt = pts[1];
}
result = constructSimpleType(clz, Map.Entry.class, new JavaType[] { kt, vt });
} else {
result = new SimpleType(clz);
}
}
_typeCache.put(key, result); // cache object syncs
return result;
}
/**
* Method used by {@link TypeParser} when generics-aware version
* is constructed.
*/
protected JavaType _fromParameterizedClass(Class clz, List paramTypes)
{
if (clz.isArray()) { // ignore generics (should never have any)
return ArrayType.construct(_constructType(clz.getComponentType(), null), null, null);
}
if (clz.isEnum()) { // ditto for enums
return new SimpleType(clz);
}
if (Map.class.isAssignableFrom(clz)) {
// First: if we do have param types, use them
JavaType keyType, contentType;
if (paramTypes.size() > 0) {
keyType = paramTypes.get(0);
contentType = (paramTypes.size() >= 2) ?
paramTypes.get(1) : _unknownType();
return MapType.construct(clz, keyType, contentType);
}
return _mapType(clz);
}
if (Collection.class.isAssignableFrom(clz)) {
if (paramTypes.size() >= 1) {
return CollectionType.construct(clz, paramTypes.get(0));
}
return _collectionType(clz);
}
if (paramTypes.size() == 0) {
return new SimpleType(clz);
}
// Hmmh. Does this actually occur?
JavaType[] pt = paramTypes.toArray(new JavaType[paramTypes.size()]);
return constructSimpleType(clz, clz, pt);
}
/**
* This method deals with parameterized types, that is,
* first class generic classes.
*/
protected JavaType _fromParamType(ParameterizedType type, TypeBindings context)
{
/* First: what is the actual base type? One odd thing
* is that 'getRawType' returns Type, not Class as
* one might expect. But let's assume it is always of
* type Class: if not, need to add more code to resolve
* it to Class.
*/
Class rawType = (Class) type.getRawType();
Type[] args = type.getActualTypeArguments();
int paramCount = (args == null) ? 0 : args.length;
JavaType[] pt;
if (paramCount == 0) {
pt = NO_TYPES;
} else {
pt = new JavaType[paramCount];
for (int i = 0; i < paramCount; ++i) {
pt[i] = _constructType(args[i], context);
}
}
// Ok: Map or Collection?
if (Map.class.isAssignableFrom(rawType)) {
JavaType subtype = constructSimpleType(rawType, rawType, pt);
JavaType[] mapParams = findTypeParameters(subtype, Map.class);
if (mapParams.length != 2) {
throw new IllegalArgumentException("Could not find 2 type parameters for Map class "+rawType.getName()+" (found "+mapParams.length+")");
}
return MapType.construct(rawType, mapParams[0], mapParams[1]);
}
if (Collection.class.isAssignableFrom(rawType)) {
JavaType subtype = constructSimpleType(rawType, rawType, pt);
JavaType[] collectionParams = findTypeParameters(subtype, Collection.class);
if (collectionParams.length != 1) {
throw new IllegalArgumentException("Could not find 1 type parameter for Collection class "+rawType.getName()+" (found "+collectionParams.length+")");
}
return CollectionType.construct(rawType, collectionParams[0]);
}
if (paramCount == 0) { // no generics
return new SimpleType(rawType);
}
return constructSimpleType(rawType, pt);
}
protected JavaType _fromArrayType(GenericArrayType type, TypeBindings context)
{
JavaType compType = _constructType(type.getGenericComponentType(), context);
return ArrayType.construct(compType, null, null);
}
protected JavaType _fromVariable(TypeVariable type, TypeBindings context)
{
final String name = type.getName();
// 19-Mar-2015: Without context, all we can check are bounds.
if (context == null) {
// And to prevent infinite loops, now need this:
context = new TypeBindings(this, (Class) null);
} else {
// Ok: here's where context might come in handy!
/* 19-Mar-2015, tatu: As per [databind#609], may need to allow
* unresolved type variables to handle some cases where bounds
* are enough. Let's hope it does not hide real fail cases.
*/
JavaType actualType = context.findType(name, false);
if (actualType != null) {
return actualType;
}
}
/* 29-Jan-2010, tatu: We used to throw exception here, if type was
* bound: but the problem is that this can occur for generic "base"
* method, overridden by sub-class. If so, we will want to ignore
* current type (for method) since it will be masked.
*/
Type[] bounds = type.getBounds();
// With type variables we must use bound information.
// Theoretically this gets tricky, as there may be multiple
// bounds ("... extends A & B"); and optimally we might
// want to choose the best match. Also, bounds are optional;
// but here we are lucky in that implicit "Object" is
// added as bounds if so.
// Either way let's just use the first bound, for now, and
// worry about better match later on if there is need.
/* 29-Jan-2010, tatu: One more problem are recursive types
* (T extends Comparable). Need to add "placeholder"
* for resolution to catch those.
*/
context._addPlaceholder(name);
return _constructType(bounds[0], context);
}
protected JavaType _fromWildcard(WildcardType type, TypeBindings context)
{
/* Similar to challenges with TypeVariable, we may have
* multiple upper bounds. But it is also possible that if
* upper bound defaults to Object, we might want to consider
* lower bounds instead.
*
* For now, we won't try anything more advanced; above is
* just for future reference.
*/
return _constructType(type.getUpperBounds()[0], context);
}
private JavaType _mapType(Class rawClass)
{
JavaType[] typeParams = findTypeParameters(rawClass, Map.class);
// ok to have no types ("raw")
if (typeParams == null) {
return MapType.construct(rawClass, _unknownType(), _unknownType());
}
// but exactly 2 types if any found
if (typeParams.length != 2) {
throw new IllegalArgumentException("Strange Map type "+rawClass.getName()+": can not determine type parameters");
}
return MapType.construct(rawClass, typeParams[0], typeParams[1]);
}
private JavaType _collectionType(Class rawClass)
{
JavaType[] typeParams = findTypeParameters(rawClass, Collection.class);
// ok to have no types ("raw")
if (typeParams == null) {
return CollectionType.construct(rawClass, _unknownType());
}
// but exactly 2 types if any found
if (typeParams.length != 1) {
throw new IllegalArgumentException("Strange Collection type "+rawClass.getName()+": can not determine type parameters");
}
return CollectionType.construct(rawClass, typeParams[0]);
}
protected JavaType _resolveVariableViaSubTypes(HierarchicType leafType, String variableName, TypeBindings bindings)
{
// can't resolve raw types; possible to have as-of-yet-unbound types too:
if (leafType != null && leafType.isGeneric()) {
TypeVariable[] typeVariables = leafType.getRawClass().getTypeParameters();
for (int i = 0, len = typeVariables.length; i < len; ++i) {
TypeVariable tv = typeVariables[i];
if (variableName.equals(tv.getName())) {
// further resolution needed?
Type type = leafType.asGeneric().getActualTypeArguments()[i];
if (type instanceof TypeVariable) {
return _resolveVariableViaSubTypes(leafType.getSubType(), ((TypeVariable) type).getName(), bindings);
}
// no we're good for the variable (but it may have parameterization of its own)
return _constructType(type, bindings);
}
}
}
return _unknownType();
}
protected JavaType _unknownType() {
return new SimpleType(Object.class);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
/**
* Helper method used to find inheritance (implements, extends) path
* between given types, if one exists (caller generally checks before
* calling this method). Returned type represents given subtype,
* with supertype linkage extending to supertype.
*/
protected HierarchicType _findSuperTypeChain(Class subtype, Class supertype)
{
// If super-type is a class (not interface), bit simpler
if (supertype.isInterface()) {
return _findSuperInterfaceChain(subtype, supertype);
}
return _findSuperClassChain(subtype, supertype);
}
protected HierarchicType _findSuperClassChain(Type currentType, Class target)
{
HierarchicType current = new HierarchicType(currentType);
Class raw = current.getRawClass();
if (raw == target) {
return current;
}
// Otherwise, keep on going down the rat hole...
Type parent = raw.getGenericSuperclass();
if (parent != null) {
HierarchicType sup = _findSuperClassChain(parent, target);
if (sup != null) {
sup.setSubType(current);
current.setSuperType(sup);
return current;
}
}
return null;
}
protected HierarchicType _findSuperInterfaceChain(Type currentType, Class target)
{
HierarchicType current = new HierarchicType(currentType);
Class raw = current.getRawClass();
if (raw == target) {
return new HierarchicType(currentType);
}
// Otherwise, keep on going down the rat hole; first implemented interfaces
/* 16-Aug-2011, tatu: Minor optimization based on profiled hot spot; let's
* try caching certain commonly needed cases
*/
if (raw == HashMap.class) {
if (target == Map.class) {
return _hashMapSuperInterfaceChain(current);
}
}
if (raw == ArrayList.class) {
if (target == List.class) {
return _arrayListSuperInterfaceChain(current);
}
}
return _doFindSuperInterfaceChain(current, target);
}
protected HierarchicType _doFindSuperInterfaceChain(HierarchicType current, Class target)
{
Class raw = current.getRawClass();
Type[] parents = raw.getGenericInterfaces();
// as long as there are superclasses
// and unless we have already seen the type (>)
if (parents != null) {
for (Type parent : parents) {
HierarchicType sup = _findSuperInterfaceChain(parent, target);
if (sup != null) {
sup.setSubType(current);
current.setSuperType(sup);
return current;
}
}
}
// and then super-class if any
Type parent = raw.getGenericSuperclass();
if (parent != null) {
HierarchicType sup = _findSuperInterfaceChain(parent, target);
if (sup != null) {
sup.setSubType(current);
current.setSuperType(sup);
return current;
}
}
return null;
}
protected synchronized HierarchicType _hashMapSuperInterfaceChain(HierarchicType current)
{
if (_cachedHashMapType == null) {
HierarchicType base = current.deepCloneWithoutSubtype();
_doFindSuperInterfaceChain(base, Map.class);
_cachedHashMapType = base.getSuperType();
}
HierarchicType t = _cachedHashMapType.deepCloneWithoutSubtype();
current.setSuperType(t);
t.setSubType(current);
return current;
}
protected synchronized HierarchicType _arrayListSuperInterfaceChain(HierarchicType current)
{
if (_cachedArrayListType == null) {
HierarchicType base = current.deepCloneWithoutSubtype();
_doFindSuperInterfaceChain(base, List.class);
_cachedArrayListType = base.getSuperType();
}
HierarchicType t = _cachedArrayListType.deepCloneWithoutSubtype();
current.setSuperType(t);
t.setSubType(current);
return current;
}
}