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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.maven.packaging.generics;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
/**
* Utility classes for generic type operations.
*/
public final class GenericsUtil {
/*
* Private constructor
*/
private GenericsUtil() {
}
/**
* 5.2.3 and 5.2.4
*/
public static boolean isAssignableFrom(boolean isDelegateOrEvent, boolean isProducer, Type requiredType, Type beanType) {
if (requiredType instanceof Class) {
return isAssignableFrom(isDelegateOrEvent, (Class) requiredType, beanType);
} else if (requiredType instanceof ParameterizedType) {
return isAssignableFrom(isDelegateOrEvent, isProducer, (ParameterizedType) requiredType, beanType);
} else if (requiredType instanceof TypeVariable) {
return isAssignableFrom(isDelegateOrEvent, (TypeVariable) requiredType, beanType);
} else if (requiredType instanceof GenericArrayType) {
return Class.class.isInstance(beanType) && Class.class.cast(beanType).isArray()
&& isAssignableFrom(isDelegateOrEvent, (GenericArrayType) requiredType, beanType);
} else if (requiredType instanceof WildcardType) {
return isAssignableFrom(isDelegateOrEvent, (WildcardType) requiredType, beanType);
} else {
throw new IllegalArgumentException("Unsupported type " + requiredType.getClass());
}
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, Class injectionPointType, Type beanType) {
if (beanType instanceof Class) {
return isAssignableFrom(injectionPointType, (Class) beanType);
} else if (beanType instanceof TypeVariable) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (TypeVariable) beanType);
} else if (beanType instanceof ParameterizedType) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (ParameterizedType) beanType);
} else if (beanType instanceof GenericArrayType) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (GenericArrayType) beanType);
} else if (beanType instanceof WildcardType) {
return isAssignableFrom(isDelegateOrEvent, (Type) injectionPointType, (WildcardType) beanType);
} else {
throw new IllegalArgumentException("Unsupported type " + injectionPointType);
}
}
private static boolean isAssignableFrom(Class injectionPointType, Class beanType) {
return ClassUtil.isClassAssignableFrom(injectionPointType, beanType);
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, Class injectionPointType, TypeVariable beanType) {
for (Type bounds : beanType.getBounds()) {
if (isAssignableFrom(isDelegateOrEvent, injectionPointType, bounds)) {
return true;
}
}
return false;
}
/**
* CDI Spec. 5.2.4: "A parameterized bean type is considered assignable to a raw required type if the raw generics
* are identical and all type parameters of the bean type are either unbounded type variables or java.lang.Object."
*/
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, Class injectionPointType, ParameterizedType beanType) {
if (beanType.getRawType() != injectionPointType) {
return false; // raw generics don't match
}
if (isDelegateOrEvent) {
// for delegate and events we match 'in reverse' kind off
// @Observes ProcessInjectionPoint does also match
// Instance
return isAssignableFrom(true, injectionPointType, beanType.getRawType());
}
for (Type typeArgument : beanType.getActualTypeArguments()) {
if (typeArgument == Object.class) {
continue;
}
if (!(typeArgument instanceof TypeVariable)) {
return false; // neither object nor type variable
}
TypeVariable typeVariable = (TypeVariable) typeArgument;
for (Type bounds : typeVariable.getBounds()) {
if (bounds != Object.class) {
return false; // bound type variable
}
}
}
return true;
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, Class injectionPointType, GenericArrayType beanType) {
return injectionPointType.isArray() && isAssignableFrom(isDelegateOrEvent, injectionPointType.getComponentType(),
beanType.getGenericComponentType());
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, Type injectionPointType, WildcardType beanType) {
for (Type bounds : beanType.getLowerBounds()) {
if (!isAssignableFrom(isDelegateOrEvent, false, bounds, injectionPointType)) {
return false;
}
}
for (Type bounds : beanType.getUpperBounds()) {
if (isAssignableFrom(isDelegateOrEvent, false, injectionPointType, bounds)) {
return true;
}
}
return false;
}
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, boolean isProducer, ParameterizedType injectionPointType, Type beanType) {
if (beanType instanceof Class) {
return isAssignableFrom(isDelegateOrEvent, isProducer, injectionPointType, (Class) beanType);
} else if (beanType instanceof TypeVariable) {
return isAssignableFrom(isDelegateOrEvent, isProducer, injectionPointType, (TypeVariable) beanType);
} else if (beanType instanceof ParameterizedType) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (ParameterizedType) beanType);
} else if (beanType instanceof WildcardType) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (WildcardType) beanType);
} else if (beanType instanceof GenericArrayType) {
return false;
} else {
throw new IllegalArgumentException("Unsupported type " + beanType.getClass());
}
}
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, boolean isProducer, ParameterizedType injectionPointType, Class beanType) {
Class rawInjectionPointType = getRawType(injectionPointType);
if (rawInjectionPointType.equals(beanType)) {
if (isProducer) {
for (final Type t : injectionPointType.getActualTypeArguments()) {
if (!TypeVariable.class.isInstance(t) || !isNotBound(TypeVariable.class.cast(t).getBounds())) {
if (!Class.class.isInstance(t) || Object.class != t) {
return false;
}
}
}
}
return true;
}
if (!rawInjectionPointType.isAssignableFrom(beanType)) {
return false;
}
if (beanType.getSuperclass() != null
&& isAssignableFrom(isDelegateOrEvent, isProducer, injectionPointType, beanType.getGenericSuperclass())) {
return true;
}
for (Type genericInterface : beanType.getGenericInterfaces()) {
if (isAssignableFrom(isDelegateOrEvent, isProducer, injectionPointType, genericInterface)) {
return true;
}
}
return false;
}
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, boolean isProducer, ParameterizedType injectionPointType, TypeVariable beanType) {
final Type[] types = beanType.getBounds();
if (isNotBound(types)) {
return true;
}
for (final Type bounds : types) {
if (isAssignableFrom(isDelegateOrEvent, isProducer, injectionPointType, bounds)) {
return true;
}
}
return false;
}
/**
* CDI Spec. 5.2.4
*/
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, ParameterizedType injectionPointType, ParameterizedType beanType) {
if (injectionPointType.getRawType() != beanType.getRawType()) {
return false;
}
boolean swapParams = !isDelegateOrEvent;
Type[] injectionPointTypeArguments = injectionPointType.getActualTypeArguments();
Type[] beanTypeArguments = beanType.getActualTypeArguments();
for (int i = 0; i < injectionPointTypeArguments.length; i++) {
Type injectionPointTypeArgument = injectionPointTypeArguments[i];
Type beanTypeArgument = beanTypeArguments[i];
// for this special case it's actually an 'assignable to', thus we
// swap the params, see CDI-389
// but this special rule does not apply to Delegate injection
// points...
if (swapParams
&& (injectionPointTypeArgument instanceof Class || injectionPointTypeArgument instanceof TypeVariable)
&& beanTypeArgument instanceof TypeVariable) {
final Type[] bounds = ((TypeVariable) beanTypeArgument).getBounds();
final boolean isNotBound = isNotBound(bounds);
if (!isNotBound) {
for (final Type upperBound : bounds) {
if (!isAssignableFrom(true, false, upperBound, injectionPointTypeArgument)) {
return false;
}
}
}
} else if (swapParams && injectionPointTypeArgument instanceof TypeVariable) {
return false;
} else if (isDelegateOrEvent && injectionPointTypeArgument instanceof Class && beanTypeArgument instanceof Class) {
// if no wildcard type was given then we require a real exact
// match.
return injectionPointTypeArgument.equals(beanTypeArgument);
} else if (!isAssignableFrom(isDelegateOrEvent, false, injectionPointTypeArgument, beanTypeArgument)) {
return false;
}
}
return true;
}
private static boolean isNotBound(final Type... bounds) {
return bounds == null || bounds.length == 0 || bounds.length == 1 && Object.class == bounds[0];
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, TypeVariable injectionPointType, Type beanType) {
for (Type bounds : injectionPointType.getBounds()) {
if (!isAssignableFrom(isDelegateOrEvent, false, bounds, beanType)) {
return false;
}
}
return true;
}
// rules are a bit different when in an array so we handle ParameterizedType
// manually (not reusing isAssignableFrom)
private static boolean isAssignableFrom(boolean isDelegateOrEvent, GenericArrayType injectionPointType, Type beanType) {
final Type genericComponentType = injectionPointType.getGenericComponentType();
final Class componentType = Class.class.cast(beanType).getComponentType();
if (Class.class.isInstance(genericComponentType)) {
return Class.class.cast(genericComponentType).isAssignableFrom(componentType);
}
if (ParameterizedType.class.isInstance(genericComponentType)) {
return isAssignableFrom(isDelegateOrEvent, false, ParameterizedType.class.cast(genericComponentType).getRawType(),
componentType);
}
return isAssignableFrom(isDelegateOrEvent, false, genericComponentType, componentType);
}
private static boolean isAssignableFrom(boolean isDelegateOrEvent, WildcardType injectionPointType, Type beanType) {
if (beanType instanceof TypeVariable) {
return isAssignableFrom(isDelegateOrEvent, injectionPointType, (TypeVariable) beanType);
}
for (Type bounds : injectionPointType.getLowerBounds()) {
if (!isAssignableFrom(isDelegateOrEvent, false, beanType, bounds)) {
return false;
}
}
for (Type bounds : injectionPointType.getUpperBounds()) {
Set beanTypeClosure = getTypeClosure(beanType);
boolean isAssignable = false;
for (Type beanSupertype : beanTypeClosure) {
if (isAssignableFrom(isDelegateOrEvent, false, bounds, beanSupertype)
|| Class.class.isInstance(bounds) && ParameterizedType.class.isInstance(beanSupertype)
&& bounds == ParameterizedType.class.cast(beanSupertype).getRawType()) {
isAssignable = true;
break;
}
}
if (!isAssignable) {
return false;
}
}
return true;
}
/**
* CDI 1.1 Spec. 5.2.4, third bullet point
*/
private static boolean isAssignableFrom(
boolean isDelegateOrEvent, WildcardType injectionPointType, TypeVariable beanType) {
for (Type upperBound : injectionPointType.getUpperBounds()) {
for (Type bound : beanType.getBounds()) {
if (!isAssignableFrom(isDelegateOrEvent, false, upperBound, bound)
&& !isAssignableFrom(isDelegateOrEvent, false, bound, upperBound)) {
return false;
}
}
}
for (Type lowerBound : injectionPointType.getLowerBounds()) {
for (Type bound : beanType.getBounds()) {
if (!isAssignableFrom(isDelegateOrEvent, false, bound, lowerBound)) {
return false;
}
}
}
return true;
}
/**
* @return true, if the specified type declaration contains an unresolved type variable.
*/
public static boolean containsTypeVariable(Type type) {
if (type instanceof Class) {
return false;
} else if (type instanceof TypeVariable) {
return true;
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
return containTypeVariable(parameterizedType.getActualTypeArguments());
} else if (type instanceof WildcardType) {
WildcardType wildcardType = (WildcardType) type;
return containTypeVariable(wildcardType.getUpperBounds()) || containTypeVariable(wildcardType.getLowerBounds());
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
return containsTypeVariable(arrayType.getGenericComponentType());
} else {
throw new IllegalArgumentException("Unsupported type " + type.getClass().getName());
}
}
public static boolean containTypeVariable(Type[] types) {
for (Type type : types) {
if (containsTypeVariable(type)) {
return true;
}
}
return false;
}
/**
* Resolves the actual type of the specified field for the type hierarchy specified by the given subclass
*/
public static Type resolveType(Class subclass, Field field) {
return resolveType(field.getGenericType(), subclass, newSeenList());
}
/**
* Resolves the actual type of the specified field for the type hierarchy specified by the given subclass
*/
public static Type resolveSetterType(Class subclass, Method method) {
return resolveType(method.getParameterTypes()[0], subclass, newSeenList());
}
/**
* Resolves the actual parameter generics of the specified method for the type hierarchy specified by the given
* subclass
*/
public static Type[] resolveParameterTypes(Class subclass, Method method) {
return resolveTypes(method.getGenericParameterTypes(), subclass);
}
public static Type resolveType(Type type, Type actualType, Collection> seen) {
if (type instanceof Class) {
return type;
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
Type[] resolvedTypeArguments;
if (Enum.class.equals(parameterizedType.getRawType())) {
// Enums derive from themselves, which would create an infinite
// loop
// we directly escape the loop if we detect this.
resolvedTypeArguments = new Type[] { new OwbWildcardTypeImpl(new Type[] { Enum.class }, ClassUtil.NO_TYPES) };
} else {
resolvedTypeArguments = resolveTypes(parameterizedType.getActualTypeArguments(), actualType, seen);
}
return new OwbParametrizedTypeImpl(
parameterizedType.getOwnerType(), parameterizedType.getRawType(), resolvedTypeArguments);
} else if (type instanceof TypeVariable) {
TypeVariable variable = (TypeVariable) type;
return resolveTypeVariable(variable, actualType, seen);
} else if (type instanceof WildcardType) {
WildcardType wildcardType = (WildcardType) type;
Type[] upperBounds = resolveTypes(wildcardType.getUpperBounds(), actualType, seen);
Type[] lowerBounds = resolveTypes(wildcardType.getLowerBounds(), actualType, seen);
return new OwbWildcardTypeImpl(upperBounds, lowerBounds);
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
return createArrayType(resolveType(arrayType.getGenericComponentType(), actualType, seen));
} else {
throw new IllegalArgumentException("Unsupported type " + type.getClass().getName());
}
}
public static Type[] resolveTypes(Type[] types, Type actualType, Collection> seen) {
Type[] resolvedTypeArguments = new Type[types.length];
for (int i = 0; i < types.length; i++) {
final Type type = resolveType(types[i], actualType, seen);
if (type != null) { // means a stackoverflow was avoided, just keep
// what we have
resolvedTypeArguments[i] = type;
}
}
return resolvedTypeArguments;
}
public static Type[] resolveTypes(Type[] types, Type actualType) {
Type[] resolvedTypeArguments = new Type[types.length];
for (int i = 0; i < types.length; i++) {
resolvedTypeArguments[i] = resolveType(types[i], actualType, newSeenList());
}
return resolvedTypeArguments;
}
public static Set getTypeClosure(Type actualType) {
return getTypeClosure(actualType, actualType);
}
/**
* Returns the type closure for the specified parameters.
* Example 1:
*
* Take the following classes:
*
*
* public class Foo {
* private T t;
* }
* public class Bar extends Foo {
* }
*
*
* To get the type closure of T in the context of Bar (which is {Number.class, Object.class}), you have to call this
* method like
*
*
* GenericUtil.getTypeClosure(Foo.class.getDeclaredField("t").getType(), Bar.class, Foo.class);
*
* Example 2:
*
* Take the following classes:
*
*
* public class Foo {
* private T t;
* }
* public class Bar extends Foo {
* }
*
*
* To get the type closure of Bar in the context of Foo (which are besides Object.class the
* ParameterizedTypes Bar and Foo), you have to call this method like
*
*
* GenericUtil.getTypeClosure(Foo.class, new TypeLiteral>() {}.getType(), Bar.class);
*
*
* @param type the type to get the closure for
* @param actualType the context to bind type variables
* @return the type closure
*/
public static Set getTypeClosure(Type type, Type actualType) {
Class rawType = getRawType(type);
Class actualRawType = getRawType(actualType);
if (rawType.isAssignableFrom(actualRawType) && rawType != actualRawType) {
return getTypeClosure(actualType, type);
}
if (hasTypeParameters(type)) {
type = getParameterizedType(type);
}
return getDirectTypeClosure(type, actualType);
}
public static Set getDirectTypeClosure(final Type type, final Type actualType) {
Set typeClosure = new HashSet<>();
typeClosure.add(Object.class);
fillTypeHierarchy(typeClosure, type, actualType);
return typeClosure;
}
private static void fillTypeHierarchy(Set set, Type type, Type actualType) {
if (type == null) {
return;
}
Type resolvedType = GenericsUtil.resolveType(type, actualType, newSeenList());
set.add(resolvedType);
Class resolvedClass = GenericsUtil.getRawType(resolvedType, actualType);
if (resolvedClass.getSuperclass() != null) {
fillTypeHierarchy(set, resolvedClass.getGenericSuperclass(), resolvedType);
}
for (Type interfaceType : resolvedClass.getGenericInterfaces()) {
fillTypeHierarchy(set, interfaceType, resolvedType);
}
}
private static Collection> newSeenList() {
return new ArrayList<>();
}
public static boolean hasTypeParameters(Type type) {
if (type instanceof Class) {
Class classType = (Class) type;
return classType.getTypeParameters().length > 0;
}
return false;
}
public static ParameterizedType getParameterizedType(Type type) {
if (type instanceof ParameterizedType) {
return (ParameterizedType) type;
} else if (type instanceof Class) {
Class classType = (Class) type;
return new OwbParametrizedTypeImpl(classType.getDeclaringClass(), classType, classType.getTypeParameters());
} else {
throw new IllegalArgumentException(type.getClass().getSimpleName() + " is not supported");
}
}
public static Class getRawType(Type type) {
return getRawType(type, null);
}
static Class getRawType(Type type, Type actualType) {
if (type instanceof Class) {
return (Class) type;
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
return getRawType(parameterizedType.getRawType(), actualType);
} else if (type instanceof TypeVariable) {
TypeVariable typeVariable = (TypeVariable) type;
Type mostSpecificType
= getMostSpecificType(getRawTypes(typeVariable.getBounds(), actualType), typeVariable.getBounds());
return getRawType(mostSpecificType, actualType);
} else if (type instanceof WildcardType) {
WildcardType wildcardType = (WildcardType) type;
Type mostSpecificType = getMostSpecificType(getRawTypes(wildcardType.getUpperBounds(), actualType),
wildcardType.getUpperBounds());
return getRawType(mostSpecificType, actualType);
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
return getRawType(createArrayType(getRawType(arrayType.getGenericComponentType(), actualType)), actualType);
} else {
throw new IllegalArgumentException("Unsupported type " + type.getClass().getName());
}
}
private static Class[] getRawTypes(Type[] types) {
return getRawTypes(types, null);
}
private static Class[] getRawTypes(Type[] types, Type actualType) {
Class[] rawTypes = new Class[types.length];
for (int i = 0; i < types.length; i++) {
rawTypes[i] = getRawType(types[i], actualType);
}
return rawTypes;
}
private static Type getMostSpecificType(Class[] types, Type[] genericTypes) {
Class mostSpecificType = types[0];
int mostSpecificIndex = 0;
for (int i = 0; i < types.length; i++) {
if (mostSpecificType.isAssignableFrom(types[i])) {
mostSpecificType = types[i];
mostSpecificIndex = i;
}
}
return genericTypes[mostSpecificIndex];
}
private static Type resolveTypeVariable(TypeVariable variable, Type actualType, Collection> seen) {
if (actualType == null) {
return variable;
}
Class declaringClass = getDeclaringClass(variable.getGenericDeclaration());
Class actualClass = getRawType(actualType);
if (actualClass == declaringClass) {
return resolveTypeVariable(variable, variable.getGenericDeclaration(), getParameterizedType(actualType), seen);
} else if (actualClass.isAssignableFrom(declaringClass)) {
Class directSubclass = getDirectSubclass(declaringClass, actualClass);
Type[] typeArguments = resolveTypeArguments(directSubclass, actualType);
Type directSubtype = new OwbParametrizedTypeImpl(directSubclass.getDeclaringClass(), directSubclass, typeArguments);
return resolveTypeVariable(variable, directSubtype, seen);
} else {
Type genericSuperclass = getGenericSuperclass(actualClass, declaringClass);
if (genericSuperclass == null) {
return variable;
} else if (genericSuperclass instanceof Class) {
// special handling for type erasure
Class superclass = (Class) genericSuperclass;
genericSuperclass = new OwbParametrizedTypeImpl(
superclass.getDeclaringClass(), superclass, getRawTypes(superclass.getTypeParameters()));
} else {
ParameterizedType genericSupertype = getParameterizedType(genericSuperclass);
Type[] typeArguments = resolveTypeArguments(getParameterizedType(actualType), genericSupertype);
genericSuperclass = new OwbParametrizedTypeImpl(
genericSupertype.getOwnerType(), genericSupertype.getRawType(), typeArguments);
}
Type resolvedType = resolveTypeVariable(variable, genericSuperclass, seen);
if (resolvedType instanceof TypeVariable) {
TypeVariable resolvedTypeVariable = (TypeVariable) resolvedType;
TypeVariable[] typeParameters = actualClass.getTypeParameters();
for (int i = 0; i < typeParameters.length; i++) {
if (typeParameters[i].getName().equals(resolvedTypeVariable.getName())) {
resolvedType = getParameterizedType(actualType).getActualTypeArguments()[i];
break;
}
}
}
return resolvedType;
}
}
private static Class getDeclaringClass(GenericDeclaration declaration) {
if (declaration instanceof Class) {
return (Class) declaration;
} else if (declaration instanceof Member) {
return ((Member) declaration).getDeclaringClass();
} else {
throw new IllegalArgumentException("Unsupported type " + declaration.getClass());
}
}
private static Type resolveTypeVariable(
TypeVariable variable, GenericDeclaration declaration, ParameterizedType type,
Collection> seen) {
int index = getIndex(declaration, variable);
if (declaration instanceof Class) {
if (index >= 0) {
return type.getActualTypeArguments()[index];
} else {
index = getIndex(type, variable);
if (index >= 0) {
return declaration.getTypeParameters()[index];
}
}
} else {
if (seen.contains(variable)) {
return null;
}
seen.add(variable);
Type[] resolvedBounds = resolveTypes(declaration.getTypeParameters()[index].getBounds(), type, seen);
return OwbTypeVariableImpl.createTypeVariable(variable, resolvedBounds);
}
return variable;
}
private static int getIndex(GenericDeclaration declaration, TypeVariable variable) {
Type[] typeParameters = declaration.getTypeParameters();
for (int i = 0; i < typeParameters.length; i++) {
if (typeParameters[i] instanceof TypeVariable) {
TypeVariable variableArgument = (TypeVariable) typeParameters[i];
if (variableArgument.getName().equals(variable.getName())) {
return i;
}
}
}
return -1;
}
private static int getIndex(ParameterizedType type, TypeVariable variable) {
Type[] actualTypeArguments = type.getActualTypeArguments();
for (int i = 0; i < actualTypeArguments.length; i++) {
if (actualTypeArguments[i] instanceof TypeVariable) {
TypeVariable variableArgument = (TypeVariable) actualTypeArguments[i];
if (variableArgument.getName().equals(variable.getName())) {
return i;
}
}
}
return -1;
}
private static Class getDirectSubclass(Class declaringClass, Class actualClass) {
if (actualClass.isInterface()) {
Class subclass = declaringClass;
for (Class iface : declaringClass.getInterfaces()) {
if (iface == actualClass) {
return subclass;
}
if (actualClass.isAssignableFrom(iface)) {
subclass = iface;
} else {
subclass = declaringClass.getSuperclass();
}
}
return getDirectSubclass(subclass, actualClass);
} else {
Class directSubclass = declaringClass;
while (directSubclass.getSuperclass() != actualClass) {
directSubclass = directSubclass.getSuperclass();
}
return directSubclass;
}
}
private static Type getGenericSuperclass(Class subclass, Class superclass) {
if (!superclass.isInterface()) {
return subclass.getGenericSuperclass();
} else {
for (Type genericInterface : subclass.getGenericInterfaces()) {
if (getRawType(genericInterface) == superclass) {
return genericInterface;
}
}
}
return superclass;
}
private static Type[] resolveTypeArguments(Class subclass, Type supertype) {
if (supertype instanceof ParameterizedType) {
ParameterizedType parameterizedSupertype = (ParameterizedType) supertype;
return resolveTypeArguments(subclass, parameterizedSupertype);
} else {
return subclass.getTypeParameters();
}
}
private static Type[] resolveTypeArguments(Class subclass, ParameterizedType parameterizedSupertype) {
Type genericSuperclass = getGenericSuperclass(subclass, getRawType(parameterizedSupertype));
if (!(genericSuperclass instanceof ParameterizedType)) {
return subclass.getTypeParameters();
}
ParameterizedType parameterizedSuperclass = (ParameterizedType) genericSuperclass;
Type[] typeParameters = subclass.getTypeParameters();
Type[] actualTypeArguments = parameterizedSupertype.getActualTypeArguments();
return resolveTypeArguments(parameterizedSuperclass, typeParameters, actualTypeArguments);
}
private static Type[] resolveTypeArguments(ParameterizedType subtype, ParameterizedType parameterizedSupertype) {
return resolveTypeArguments(getParameterizedType(getRawType(subtype)), parameterizedSupertype.getActualTypeArguments(),
subtype.getActualTypeArguments());
}
private static Type[] resolveTypeArguments(
ParameterizedType parameterizedType, Type[] typeParameters, Type[] actualTypeArguments) {
Type[] resolvedTypeArguments = new Type[typeParameters.length];
for (int i = 0; i < typeParameters.length; i++) {
resolvedTypeArguments[i] = resolveTypeArgument(parameterizedType, typeParameters[i], actualTypeArguments);
}
return resolvedTypeArguments;
}
private static Type resolveTypeArgument(
ParameterizedType parameterizedType, Type typeParameter, Type[] actualTypeArguments) {
if (typeParameter instanceof TypeVariable) {
TypeVariable variable = (TypeVariable) typeParameter;
int index = getIndex(parameterizedType, variable);
if (index == -1) {
return typeParameter;
} else {
return actualTypeArguments[index];
}
} else if (typeParameter instanceof GenericArrayType) {
GenericArrayType array = (GenericArrayType) typeParameter;
return createArrayType(
resolveTypeArgument(parameterizedType, array.getGenericComponentType(), actualTypeArguments));
} else {
return typeParameter;
}
}
private static Type createArrayType(Type componentType) {
if (componentType instanceof Class) {
return Array.newInstance((Class) componentType, 0).getClass();
} else {
return new OwbGenericArrayTypeImpl(componentType);
}
}
}
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