1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package tests.api.java.lang.reflect;
18
19import java.lang.reflect.Field;
20import java.lang.reflect.GenericArrayType;
21import java.lang.reflect.ParameterizedType;
22import java.lang.reflect.Type;
23import java.lang.reflect.TypeVariable;
24
25/**
26 * Tests generic reflection on arrays with generic or parameterized component types.
27 */
28public class GenericArrayTypeTest extends GenericReflectionTestsBase {
29
30    static class A<T> {
31        T[] array;
32    }
33    public void testGetGenericComponentType() throws Exception {
34        @SuppressWarnings("unchecked")
35        Class<? extends A> clazz = GenericArrayTypeTest.A.class;
36        Field field = clazz.getDeclaredField("array");
37        Type genericType = field.getGenericType();
38        assertInstanceOf(GenericArrayType.class, genericType);
39        Type componentType = ((GenericArrayType) genericType).getGenericComponentType();
40        assertEquals(getTypeParameter(clazz), componentType);
41        assertInstanceOf(TypeVariable.class, componentType);
42        TypeVariable<?> componentTypeVariable = (TypeVariable<?>) componentType;
43        assertEquals("T", componentTypeVariable.getName());
44        assertEquals(clazz, componentTypeVariable.getGenericDeclaration());
45    }
46
47    static class B<T> {
48        B<T>[] array;
49    }
50    public void testParameterizedComponentType() throws Exception {
51        @SuppressWarnings("unchecked")
52        Class<? extends B> clazz = GenericArrayTypeTest.B.class;
53        Field field = clazz.getDeclaredField("array");
54        Type genericType = field.getGenericType();
55
56        assertInstanceOf(GenericArrayType.class, genericType);
57        GenericArrayType arrayType = (GenericArrayType) genericType;
58        Type componentType = arrayType.getGenericComponentType();
59        assertInstanceOf(ParameterizedType.class, componentType);
60        ParameterizedType parameteriezdType = (ParameterizedType) componentType;
61        assertEquals(clazz, parameteriezdType.getRawType());
62        assertEquals(clazz.getTypeParameters()[0], parameteriezdType.getActualTypeArguments()[0]);
63    }
64}
65