/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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.springframework.core;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Test;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;
import static org.springframework.core.GenericTypeResolver.*;
import static org.springframework.util.ReflectionUtils.*;
/**
* @author Juergen Hoeller
* @author Sam Brannen
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public class GenericTypeResolverTests {
@Test
public void simpleInterfaceType() {
assertEquals(String.class, resolveTypeArgument(MySimpleInterfaceType.class, MyInterfaceType.class));
}
@Test
public void simpleCollectionInterfaceType() {
assertEquals(Collection.class, resolveTypeArgument(MyCollectionInterfaceType.class, MyInterfaceType.class));
}
@Test
public void simpleSuperclassType() {
assertEquals(String.class, resolveTypeArgument(MySimpleSuperclassType.class, MySuperclassType.class));
}
@Test
public void simpleCollectionSuperclassType() {
assertEquals(Collection.class, resolveTypeArgument(MyCollectionSuperclassType.class, MySuperclassType.class));
}
@Test
public void nullIfNotResolvable() {
GenericClass<String> obj = new GenericClass<>();
assertNull(resolveTypeArgument(obj.getClass(), GenericClass.class));
}
@Test
public void methodReturnTypes() {
assertEquals(Integer.class,
resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "integer"), MyInterfaceType.class));
assertEquals(String.class,
resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "string"), MyInterfaceType.class));
assertEquals(null, resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "raw"), MyInterfaceType.class));
assertEquals(null,
resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "object"), MyInterfaceType.class));
}
@Test
public void testResolveType() {
Method intMessageMethod = findMethod(MyTypeWithMethods.class, "readIntegerInputMessage", MyInterfaceType.class);
MethodParameter intMessageMethodParam = new MethodParameter(intMessageMethod, 0);
assertEquals(MyInterfaceType.class,
resolveType(intMessageMethodParam.getGenericParameterType(), new HashMap<>()));
Method intArrMessageMethod = findMethod(MyTypeWithMethods.class, "readIntegerArrayInputMessage",
MyInterfaceType[].class);
MethodParameter intArrMessageMethodParam = new MethodParameter(intArrMessageMethod, 0);
assertEquals(MyInterfaceType[].class,
resolveType(intArrMessageMethodParam.getGenericParameterType(), new HashMap<>()));
Method genericArrMessageMethod = findMethod(MySimpleTypeWithMethods.class, "readGenericArrayInputMessage",
Object[].class);
MethodParameter genericArrMessageMethodParam = new MethodParameter(genericArrMessageMethod, 0);
Map<TypeVariable, Type> varMap = getTypeVariableMap(MySimpleTypeWithMethods.class);
assertEquals(Integer[].class, resolveType(genericArrMessageMethodParam.getGenericParameterType(), varMap));
}
@Test
public void testBoundParameterizedType() {
assertEquals(B.class, resolveTypeArgument(TestImpl.class, TestIfc.class));
}
@Test
public void testGetTypeVariableMap() throws Exception {
Map<TypeVariable, Type> map;
map = GenericTypeResolver.getTypeVariableMap(MySimpleInterfaceType.class);
assertThat(map.toString(), equalTo("{T=class java.lang.String}"));
map = GenericTypeResolver.getTypeVariableMap(MyCollectionInterfaceType.class);
assertThat(map.toString(), equalTo("{T=java.util.Collection<java.lang.String>}"));
map = GenericTypeResolver.getTypeVariableMap(MyCollectionSuperclassType.class);
assertThat(map.toString(), equalTo("{T=java.util.Collection<java.lang.String>}"));
map = GenericTypeResolver.getTypeVariableMap(MySimpleTypeWithMethods.class);
assertThat(map.toString(), equalTo("{T=class java.lang.Integer}"));
map = GenericTypeResolver.getTypeVariableMap(TopLevelClass.class);
assertThat(map.toString(), equalTo("{}"));
map = GenericTypeResolver.getTypeVariableMap(TypedTopLevelClass.class);
assertThat(map.toString(), equalTo("{T=class java.lang.Integer}"));
map = GenericTypeResolver.getTypeVariableMap(TypedTopLevelClass.TypedNested.class);
assertThat(map.size(), equalTo(2));
Type t = null;
Type x = null;
for (Map.Entry<TypeVariable, Type> entry : map.entrySet()) {
if (entry.getKey().toString().equals("T")) {
t = entry.getValue();
}
else {
x = entry.getValue();
}
}
assertThat(t, equalTo((Type) Integer.class));
assertThat(x, equalTo((Type) Long.class));
}
@Test // SPR-11030
public void getGenericsCannotBeResolved() throws Exception {
Class<?>[] resolved = GenericTypeResolver.resolveTypeArguments(List.class, Iterable.class);
assertNull(resolved);
}
@Test // SPR-11052
public void getRawMapTypeCannotBeResolved() throws Exception {
Class<?>[] resolved = GenericTypeResolver.resolveTypeArguments(Map.class, Map.class);
assertNull(resolved);
}
@Test // SPR-11044
public void getGenericsOnArrayFromParamCannotBeResolved() throws Exception {
MethodParameter methodParameter = MethodParameter.forExecutable(
WithArrayBase.class.getDeclaredMethod("array", Object[].class), 0);
Class<?> resolved = GenericTypeResolver.resolveParameterType(methodParameter, WithArray.class);
assertThat(resolved, equalTo((Class<?>) Object[].class));
}
@Test // SPR-11044
public void getGenericsOnArrayFromReturnCannotBeResolved() throws Exception {
Class<?> resolved = GenericTypeResolver.resolveReturnType(
WithArrayBase.class.getDeclaredMethod("array", Object[].class), WithArray.class);
assertThat(resolved, equalTo((Class<?>) Object[].class));
}
@Test // SPR-11763
public void resolveIncompleteTypeVariables() {
Class<?>[] resolved = GenericTypeResolver.resolveTypeArguments(IdFixingRepository.class, Repository.class);
assertNotNull(resolved);
assertEquals(2, resolved.length);
assertEquals(Object.class, resolved[0]);
assertEquals(Long.class, resolved[1]);
}
public interface MyInterfaceType<T> {
}
public class MySimpleInterfaceType implements MyInterfaceType<String> {
}
public class MyCollectionInterfaceType implements MyInterfaceType<Collection<String>> {
}
public abstract class MySuperclassType<T> {
}
public class MySimpleSuperclassType extends MySuperclassType<String> {
}
public class MyCollectionSuperclassType extends MySuperclassType<Collection<String>> {
}
public static class MyTypeWithMethods<T> {
public MyInterfaceType<Integer> integer() {
return null;
}
public MySimpleInterfaceType string() {
return null;
}
public Object object() {
return null;
}
public MyInterfaceType raw() {
return null;
}
public String notParameterized() {
return null;
}
public String notParameterizedWithArguments(Integer x, Boolean b) {
return null;
}
/**
* Simulates a factory method that wraps the supplied object in a proxy of the
* same type.
*/
public static <T> T createProxy(T object) {
return null;
}
/**
* Similar to {@link #createProxy(Object)} but adds an additional argument before
* the argument of type {@code T}. Note that they may potentially be of the same
* time when invoked!
*/
public static <T> T createNamedProxy(String name, T object) {
return null;
}
/**
* Simulates factory methods found in libraries such as Mockito and EasyMock.
*/
public static <MOCK> MOCK createMock(Class<MOCK> toMock) {
return null;
}
/**
* Similar to {@link #createMock(Class)} but adds an additional method argument
* before the parameterized argument.
*/
public static <T> T createNamedMock(String name, Class<T> toMock) {
return null;
}
/**
* Similar to {@link #createNamedMock(String, Class)} but adds an additional
* parameterized type.
*/
public static <V extends Object, T> T createVMock(V name, Class<T> toMock) {
return null;
}
/**
* Extract some value of the type supported by the interface (i.e., by a concrete,
* non-generic implementation of the interface).
*/
public static <T> T extractValueFrom(MyInterfaceType<T> myInterfaceType) {
return null;
}
/**
* Extract some magic value from the supplied map.
*/
public static <K, V> V extractMagicValue(Map<K, V> map) {
return null;
}
public void readIntegerInputMessage(MyInterfaceType<Integer> message) {
}
public void readIntegerArrayInputMessage(MyInterfaceType<Integer>[] message) {
}
public void readGenericArrayInputMessage(T[] message) {
}
}
public static class MySimpleTypeWithMethods extends MyTypeWithMethods<Integer> {
}
static class GenericClass<T> {
}
class A{}
class B<T>{}
class TestIfc<T>{}
class TestImpl<I extends A, T extends B<I>> extends TestIfc<T>{
}
static class TopLevelClass<T> {
class Nested<X> {
}
}
static class TypedTopLevelClass extends TopLevelClass<Integer> {
class TypedNested extends Nested<Long> {
}
}
static abstract class WithArrayBase<T> {
public abstract T[] array(T... args);
}
static abstract class WithArray<T> extends WithArrayBase<T> {
}
interface Repository<T, ID extends Serializable> {
}
interface IdFixingRepository<T> extends Repository<T, Long> {
}
}