/**
* Establishes the type bound:
*
* <ol>
* <li>{@code<? extends Number>}, returns Number
* <li>{@code<? super Number>}, returns Number
* <li>{@code<?>}, returns Object
* <li>{@code<T extends Number>, returns Number}
* </ol>
*
* @param typeMirror the type to return the bound for
* @return the bound for this parameter
*/
public TypeMirror getTypeBound(TypeMirror typeMirror) {
if (typeMirror.getKind() == TypeKind.WILDCARD) {
WildcardType wildCardType = (WildcardType) typeMirror;
if (wildCardType.getExtendsBound() != null) {
return wildCardType.getExtendsBound();
}
if (wildCardType.getSuperBound() != null) {
return wildCardType.getSuperBound();
}
String wildCardName = wildCardType.toString();
if ("?".equals(wildCardName)) {
return elementUtils.getTypeElement(Object.class.getCanonicalName()).asType();
}
} else if (typeMirror.getKind() == TypeKind.TYPEVAR) {
TypeVariable typeVariableType = (TypeVariable) typeMirror;
if (typeVariableType.getUpperBound() != null) {
return typeVariableType.getUpperBound();
}
// Lowerbounds intentionally left out: Type variables otherwise have a lower bound of
// NullType.
}
return typeMirror;
}
void caseType(TypeMirror type) {
if (ended) {
// to prevent additional recursive effects when using workaround
return;
}
switch (type.getKind()) {
case ERROR:
unresolvedTypeHasOccured = true;
// $FALL-THROUGH$
case DECLARED:
DeclaredType declaredType = (DeclaredType) type;
appendResolved(declaredType);
appendTypeArguments(type, declaredType);
break;
case ARRAY:
TypeMirror componentType = ((ArrayType) type).getComponentType();
int mark = buffer.length();
caseType(componentType);
cutTypeArgument(type, mark);
buffer.append('[').append(']');
break;
case WILDCARD:
WildcardType wildcard = (WildcardType) type;
@Nullable TypeMirror extendsBound = wildcard.getExtendsBound();
@Nullable TypeMirror superBound = wildcard.getSuperBound();
if (extendsBound != null) {
buffer.append("? extends ");
caseType(extendsBound);
} else if (superBound != null) {
buffer.append("? super ");
caseType(superBound);
} else {
buffer.append('?');
}
break;
case TYPEVAR:
// this workaround breaks this recursive flow, so we set up
// ended flag
if (tryToUseSourceAsAWorkaround()) {
ended = true;
break;
}
reporter.error(
"It is a compiler/annotation processing bug to receive type variables '%s' here."
+ " To avoid it — do not use not yet generated types in %s attribute",
type, element.getSimpleName());
// just append as toString whatever we have
buffer.append(type);
break;
default:
buffer.append(type);
}
}
public static TypeName get(javax.lang.model.type.WildcardType mirror) {
TypeMirror extendsBound = mirror.getExtendsBound();
if (extendsBound == null) {
TypeMirror superBound = mirror.getSuperBound();
if (superBound == null) {
return subtypeOf(Object.class);
} else {
return supertypeOf(TypeName.get(superBound));
}
} else {
return subtypeOf(TypeName.get(extendsBound));
}
}
static TypeName get(
javax.lang.model.type.WildcardType mirror,
Map<TypeParameterElement, TypeVariableName> typeVariables) {
TypeMirror extendsBound = mirror.getExtendsBound();
if (extendsBound == null) {
TypeMirror superBound = mirror.getSuperBound();
if (superBound == null) {
return subtypeOf(Object.class);
} else {
return supertypeOf(TypeName.get(superBound, typeVariables));
}
} else {
return subtypeOf(TypeName.get(extendsBound, typeVariables));
}
}
@Override
public JsonElement visitList(DeclaredType t, Element el) {
JsonElement jsonElement;
String converterClassName = getConverterClassName(el);
if (converterClassName != null) {
jsonElement = genJsonElement(t, el, Kind.CONVERTER);
} else {
List<? extends TypeMirror> generics = t.getTypeArguments();
if (generics.size() != 1) {
Log.e("expected single type generics.", el);
encountError = true;
return defaultAction(t, el);
}
TypeMirror tm = generics.get(0);
if (tm instanceof WildcardType) {
WildcardType wt = (WildcardType) tm;
TypeMirror extendsBound = wt.getExtendsBound();
if (extendsBound != null) {
tm = extendsBound;
}
TypeMirror superBound = wt.getSuperBound();
if (superBound != null) {
Log.e("super is not supported.", el);
encountError = true;
return defaultAction(t, el);
}
}
Element type = processingEnv.getTypeUtils().asElement(tm);
JsonModel hash = type.getAnnotation(JsonModel.class);
if (hash == null) {
Log.e("expect for use decorated class by JsonModel annotation.", el);
encountError = true;
return defaultAction(t, el);
}
jsonElement = new JsonElement();
jsonElement.setKey(getElementKeyString(el));
JsonKey key = el.getAnnotation(JsonKey.class);
String setter = getElementSetter(el);
if (key.in() && setter == null) {
Log.e("can't find setter method", el);
encountError = true;
return defaultAction(t, el);
}
String getter = getElementGetter(el);
if (key.out() && getter == null) {
Log.e("can't find getter method", el);
encountError = true;
return defaultAction(t, el);
}
jsonElement.setIn(key.in());
jsonElement.setSetter(setter);
jsonElement.setOut(key.out());
jsonElement.setGetter(getter);
jsonElement.setModelName(tm.toString());
jsonElement.setKind(Kind.LIST);
}
return jsonElement;
}
static WildcardName forTypeMirror(WildcardType mirror) {
return new WildcardName(
Optional.fromNullable(mirror.getExtendsBound()).transform(FOR_TYPE_MIRROR),
Optional.fromNullable(mirror.getSuperBound()).transform(FOR_TYPE_MIRROR));
}
@Override
public TypeElement visitWildcard(WildcardType t, Void p) {
return visit(t.getExtendsBound());
}