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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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 tests.api.java.lang.reflect;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
/**
* Tests type variables and their properties.
*/
public class TypeVariableTest extends GenericReflectionTestsBase {
static class A<T>{}
public void testSimpleTypeVariableOnClass(){
Class<? extends A> clazz = A.class;
TypeVariable[] typeParameters = clazz.getTypeParameters();
assertLenghtOne(typeParameters);
TypeVariable<Class> typeVariable = typeParameters[0];
assertEquals(clazz, typeVariable.getGenericDeclaration());
assertEquals("T", typeVariable.getName());
Type[] bounds = typeVariable.getBounds();
assertLenghtOne(bounds);
assertEquals(Object.class, bounds[0]);
}
static class B{
<T> void b(){};
}
public void testSimpleTypeVariableOnMethod() throws Exception{
Class<? extends B> clazz = B.class;
Method method = clazz.getDeclaredMethod("b");
TypeVariable<Method>[] typeParameters = method.getTypeParameters();
assertLenghtOne(typeParameters);
TypeVariable<Method> typeVariable = typeParameters[0];
assertEquals(method, typeVariable.getGenericDeclaration());
assertEquals("T", typeVariable.getName());
Type[] bounds = typeVariable.getBounds();
assertLenghtOne(bounds);
assertEquals(Object.class, bounds[0]);
}
static class C {
<T>C(){}
}
public void testSimpleTypeVariableOnConstructor() throws Exception{
Class<? extends C> clazz = C.class;
Constructor<?> constructor = clazz.getDeclaredConstructor();
TypeVariable<?>[] typeParameters = constructor.getTypeParameters();
assertLenghtOne(typeParameters);
TypeVariable<?> typeVariable = typeParameters[0];
assertEquals(constructor, typeVariable.getGenericDeclaration());
assertEquals("T", typeVariable.getName());
Type[] bounds = typeVariable.getBounds();
assertLenghtOne(bounds);
assertEquals(Object.class, bounds[0]);
}
static class D<Q,R,S>{}
public void testMultipleTypeVariablesOnClass() throws Exception {
Class<? extends D> clazz = D.class;
TypeVariable<?>[] typeParameters = clazz.getTypeParameters();
assertEquals(3, typeParameters.length);
assertEquals("Q", typeParameters[0].getName());
assertEquals(clazz, typeParameters[0].getGenericDeclaration());
assertEquals("R", typeParameters[1].getName());
assertEquals(clazz, typeParameters[1].getGenericDeclaration());
assertEquals("S", typeParameters[2].getName());
assertEquals(clazz, typeParameters[2].getGenericDeclaration());
}
static class E {
<Q,R,S> void e(){}
}
public void testMultipleTypeVariablesOnMethod() throws Exception {
Class<? extends E> clazz = E.class;
Method method = clazz.getDeclaredMethod("e");
TypeVariable<?>[] typeParameters = method.getTypeParameters();
assertEquals(3, typeParameters.length);
assertEquals("Q", typeParameters[0].getName());
assertEquals(method, typeParameters[0].getGenericDeclaration());
assertEquals("R", typeParameters[1].getName());
assertEquals(method, typeParameters[1].getGenericDeclaration());
assertEquals("S", typeParameters[2].getName());
assertEquals(method, typeParameters[2].getGenericDeclaration());
}
static class F {
<Q,R,S> F(){}
}
public void testMultipleTypeVariablesOnConstructor() throws Exception {
Class<? extends F> clazz = F.class;
Constructor<?> constructor = clazz.getDeclaredConstructor();
TypeVariable<?>[] typeParameters = constructor.getTypeParameters();
assertEquals(3, typeParameters.length);
assertEquals("Q", typeParameters[0].getName());
assertEquals(constructor, typeParameters[0].getGenericDeclaration());
assertEquals("R", typeParameters[1].getName());
assertEquals(constructor, typeParameters[1].getGenericDeclaration());
assertEquals("S", typeParameters[2].getName());
assertEquals(constructor, typeParameters[2].getGenericDeclaration());
}
static class G <T extends Number>{}
public void testSingleBound() throws Exception {
Class<? extends G> clazz = G.class;
TypeVariable[] typeParameters = clazz.getTypeParameters();
TypeVariable<Class> typeVariable = typeParameters[0];
Type[] bounds = typeVariable.getBounds();
assertLenghtOne(bounds);
assertEquals(Number.class, bounds[0]);
}
static class H <T extends Number & Serializable >{}
public void testMultipleBound() throws Exception {
Class<? extends H> clazz = H.class;
TypeVariable[] typeParameters = clazz.getTypeParameters();
TypeVariable<Class> typeVariable = typeParameters[0];
Type[] bounds = typeVariable.getBounds();
assertEquals(2, bounds.length);
assertEquals(Number.class, bounds[0]);
assertEquals(Serializable.class, bounds[1]);
}
}
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