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.Method;
20import java.lang.reflect.TypeVariable;
21
22import junit.framework.TestCase;
23
24public class GenericReflectionTestsBase extends TestCase{
25
26    /**
27     * Returns the type parameter of the declaring method.
28     *
29     * @param method
30     *            the declaring method
31     * @return the type parameter of the method
32     */
33    public TypeVariable<Method> getTypeParameter(Method method) {
34        TypeVariable<Method>[] typeParameters = method.getTypeParameters();
35        assertLenghtOne(typeParameters);
36        TypeVariable<Method> typeParameter = typeParameters[0];
37        return typeParameter;
38    }
39
40    /**
41     * Returns the type parameter of the declaring class.
42     *
43     * @param method
44     *            the declaring method.
45     * @return the type parameter of the method.
46     */
47    @SuppressWarnings("unchecked")
48    public TypeVariable<Class> getTypeParameter(Class<?> clazz) {
49        TypeVariable[] typeParameters = clazz.getTypeParameters();
50        assertLenghtOne(typeParameters);
51        TypeVariable<Class> typeVariable = typeParameters[0];
52        assertEquals(clazz, typeVariable.getGenericDeclaration());
53        assertEquals("T", typeVariable.getName());
54        return typeVariable;
55    }
56
57    public static void assertLenghtOne(Object[] array) {
58        TestCase.assertEquals("Array does NOT contain exactly one element.", 1, array.length);
59    }
60
61    public static void assertLenghtZero(Object[] array) {
62        TestCase.assertEquals("Array has more than zero elements.", 0, array.length);
63    }
64
65    public static void assertInstanceOf(Class<?> expectedClass, Object actual) {
66        TestCase.assertTrue(actual.getClass().getName() + " is not instance of :" + expectedClass.getName(), expectedClass
67                .isInstance(actual));
68    }
69
70    public static void assertNotEquals(Object expected, Object actual) {
71        TestCase.assertFalse(actual.toString() + " has not to be equal to " + expected.toString(), expected.equals(actual));
72    }
73
74}
75