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VariableTypeInheritanceSearch.java
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VariableTypeInheritanceSearch.java
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/*
* Copyright (c) 2015, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
package org.eclipse.yasson.internal;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayDeque;
import java.util.Deque;
import jakarta.json.bind.JsonbException;
import org.eclipse.yasson.internal.properties.MessageKeys;
import org.eclipse.yasson.internal.properties.Messages;
/**
* Search for type variable in inheritance hierarchy and resolve if possible.
*/
public class VariableTypeInheritanceSearch {
private final Deque<ParameterizedType> parameterizedSubclasses = new ArrayDeque<>();
/**
* Searches the hierarchy of classes to resolve a type variable. If typevar resolved value is another typevar redirection
* (propagated from wrapping class),
* this typevar is returned.
*
* <pre>
*
* Example 1: typevar is resolved
*
*
* class GenericClass <T> {
* private T genericField;
* }
* class ConcreteClass extends GenericClass<MyPojo> {
* //...
* }
*
* In above case when ConcreteClass type is passed as runtime type and <T> as type variable, T is resolved to MyPojo.
* </pre>
*
*
* <pre>
* Example 2: typevar is resolved to another propagated typevar
*
*
* class WrapperGenericClass<X> {
* private GenericClass<X> propagatedGenericField
* }
*
* class AnotherClass extends WrapperGenericClass<MyPojo> {
* }
*
*
* In second case when GenericClass {@link ParameterizedType} is passed as runtime type and <T> as type variable,
* T is resolved to propagated <X> by WrapperGenericClass.
*
* Resolution on <X> must be performed thereafter with AnotherClass runtime type.
* </pre>
*
* @param typeToSearch runtime type to search for typevar in, not null
* @param typeVar type variable to resolve, not null
* @return resolved runtime type, or type variable
*/
public Type searchParametrizedType(Type typeToSearch, TypeVariable<?> typeVar) {
ParameterizedType parameterizedType = findParameterizedSuperclass(typeToSearch);
if (parameterizedType == null) {
return null;
}
Type matchedGenericType = searchRuntimeTypeArgument(parameterizedType, typeVar);
if (matchedGenericType != null) {
return matchedGenericType;
}
parameterizedSubclasses.push(parameterizedType);
return searchParametrizedType(((Class) parameterizedType.getRawType()).getGenericSuperclass(), typeVar);
}
private Type checkSubclassRuntimeInfo(TypeVariable typeVar) {
if (parameterizedSubclasses.size() == 0) {
return typeVar;
}
ParameterizedType parametrizedSubclass = parameterizedSubclasses.pop();
return searchRuntimeTypeArgument(parametrizedSubclass, typeVar);
}
private Type searchRuntimeTypeArgument(ParameterizedType runtimeType, TypeVariable<?> typeVar) {
if (ReflectionUtils.getRawType(runtimeType) != typeVar.getGenericDeclaration()) {
return null;
}
TypeVariable[] bounds = typeVar.getGenericDeclaration().getTypeParameters();
for (int i = 0; i < bounds.length; i++) {
if (bounds[i].equals(typeVar)) {
Type matchedGenericType = runtimeType.getActualTypeArguments()[i];
//Propagated generic types to another generic classes
if (matchedGenericType instanceof TypeVariable<?>) {
return checkSubclassRuntimeInfo((TypeVariable) matchedGenericType);
}
//found runtime matchedGenericType
return matchedGenericType;
}
}
return null;
}
private static ParameterizedType findParameterizedSuperclass(Type type) {
if (type == null || type instanceof ParameterizedType) {
return (ParameterizedType) type;
}
if (!(type instanceof Class)) {
throw new JsonbException(Messages.getMessage(MessageKeys.RESOLVE_PARAMETRIZED_TYPE, type));
}
return findParameterizedSuperclass(((Class) type).getGenericSuperclass());
}
}