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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.dubbo.common.utils;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;
import static java.util.Collections.unmodifiableList;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toSet;
import static java.util.stream.StreamSupport.stream;
import static org.apache.dubbo.common.function.Predicates.and;
import static org.apache.dubbo.common.function.Streams.filterAll;
import static org.apache.dubbo.common.function.Streams.filterList;
import static org.apache.dubbo.common.utils.ClassUtils.getAllInterfaces;
import static org.apache.dubbo.common.utils.ClassUtils.getAllSuperClasses;
import static org.apache.dubbo.common.utils.ClassUtils.isAssignableFrom;
/**
* The utilities class for {@link Type}
*
* @since 2.7.6
*/
public interface TypeUtils {
Predicate> NON_OBJECT_TYPE_FILTER = t -> !Objects.equals(Object.class, t);
static boolean isParameterizedType(Type type) {
return type instanceof ParameterizedType;
}
static Type getRawType(Type type) {
if (isParameterizedType(type)) {
return ((ParameterizedType) type).getRawType();
} else {
return type;
}
}
static Class getRawClass(Type type) {
Type rawType = getRawType(type);
if (isClass(rawType)) {
return (Class) rawType;
}
return null;
}
static boolean isClass(Type type) {
return type instanceof Class;
}
static Class findActualTypeArgument(Type type, Class interfaceClass, int index) {
return (Class) findActualTypeArguments(type, interfaceClass).get(index);
}
static List> findActualTypeArguments(Type type, Class interfaceClass) {
List> actualTypeArguments = new ArrayList<>();
getAllGenericTypes(type, t -> isAssignableFrom(interfaceClass, getRawClass(t)))
.forEach(parameterizedType -> {
Class rawClass = getRawClass(parameterizedType);
Type[] typeArguments = parameterizedType.getActualTypeArguments();
for (int i = 0; i < typeArguments.length; i++) {
Type typeArgument = typeArguments[i];
if (typeArgument instanceof Class) {
actualTypeArguments.add(i, (Class) typeArgument);
}
}
Class superClass = rawClass.getSuperclass();
if (superClass != null) {
actualTypeArguments.addAll(findActualTypeArguments(superClass, interfaceClass));
}
});
return unmodifiableList(actualTypeArguments);
}
/**
* Get the specified types' generic types(including super classes and interfaces) that are assignable from {@link ParameterizedType} interface
*
* @param type the specified type
* @param typeFilters one or more {@link Predicate}s to filter the {@link ParameterizedType} instance
* @return non-null read-only {@link List}
*/
static List getGenericTypes(Type type, Predicate... typeFilters) {
Class rawClass = getRawClass(type);
if (rawClass == null) {
return emptyList();
}
List genericTypes = new LinkedList<>();
genericTypes.add(rawClass.getGenericSuperclass());
genericTypes.addAll(asList(rawClass.getGenericInterfaces()));
return unmodifiableList(
filterList(genericTypes, TypeUtils::isParameterizedType)
.stream()
.map(ParameterizedType.class::cast)
.filter(and(typeFilters))
.collect(toList())
);
}
/**
* Get all generic types(including super classes and interfaces) that are assignable from {@link ParameterizedType} interface
*
* @param type the specified type
* @param typeFilters one or more {@link Predicate}s to filter the {@link ParameterizedType} instance
* @return non-null read-only {@link List}
*/
static List getAllGenericTypes(Type type, Predicate... typeFilters) {
List allGenericTypes = new LinkedList<>();
// Add generic super classes
allGenericTypes.addAll(getAllGenericSuperClasses(type, typeFilters));
// Add generic super interfaces
allGenericTypes.addAll(getAllGenericInterfaces(type, typeFilters));
// wrap unmodifiable object
return unmodifiableList(allGenericTypes);
}
/**
* Get all generic super classes that are assignable from {@link ParameterizedType} interface
*
* @param type the specified type
* @param typeFilters one or more {@link Predicate}s to filter the {@link ParameterizedType} instance
* @return non-null read-only {@link List}
*/
static List getAllGenericSuperClasses(Type type, Predicate... typeFilters) {
Class rawClass = getRawClass(type);
if (rawClass == null || rawClass.isInterface()) {
return emptyList();
}
List> allTypes = new LinkedList<>();
// Add current class
allTypes.add(rawClass);
// Add all super classes
allTypes.addAll(getAllSuperClasses(rawClass, NON_OBJECT_TYPE_FILTER));
List allGenericSuperClasses = allTypes
.stream()
.map(Class::getGenericSuperclass)
.filter(TypeUtils::isParameterizedType)
.map(ParameterizedType.class::cast)
.collect(Collectors.toList());
return unmodifiableList(filterAll(allGenericSuperClasses, typeFilters));
}
/**
* Get all generic interfaces that are assignable from {@link ParameterizedType} interface
*
* @param type the specified type
* @param typeFilters one or more {@link Predicate}s to filter the {@link ParameterizedType} instance
* @return non-null read-only {@link List}
*/
static List getAllGenericInterfaces(Type type, Predicate... typeFilters) {
Class rawClass = getRawClass(type);
if (rawClass == null) {
return emptyList();
}
List> allTypes = new LinkedList<>();
// Add current class
allTypes.add(rawClass);
// Add all super classes
allTypes.addAll(getAllSuperClasses(rawClass, NON_OBJECT_TYPE_FILTER));
// Add all super interfaces
allTypes.addAll(getAllInterfaces(rawClass));
List allGenericInterfaces = allTypes
.stream()
.map(Class::getGenericInterfaces)
.map(Arrays::asList)
.flatMap(Collection::stream)
.filter(TypeUtils::isParameterizedType)
.map(ParameterizedType.class::cast)
.collect(toList());
return unmodifiableList(filterAll(allGenericInterfaces, typeFilters));
}
static String getClassName(Type type) {
return getRawType(type).getTypeName();
}
static Set getClassNames(Iterable types) {
return stream(types.spliterator(), false)
.map(TypeUtils::getClassName)
.collect(toSet());
}
}