| /* |
| * 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.lang.reflect.Method; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.TypeVariable; |
| |
| |
| /** |
| * Tests unbounded type parameters declared on methods. |
| */ |
| public class GenericMethodsTests extends GenericReflectionTestsBase{ |
| |
| static class GenericMethods { |
| |
| public <T> void noParamNoReturn() {} |
| |
| public <T> void paramNoReturn(T param) {} |
| |
| @SuppressWarnings("unchecked") |
| public <T> T noParamReturn() { return (T) new Object(); } |
| |
| public <T> T paramReturn(T param) {return param;} |
| } |
| |
| private static Class<? extends GenericMethods> clazz = GenericMethodsTests.GenericMethods.class; |
| |
| /** |
| * Tests that there are no Type Parameters on the Class itself. |
| */ |
| public void testGenericMethods() { |
| assertLenghtZero(clazz.getTypeParameters()); |
| } |
| |
| /** |
| * Tests whether the specified method declares a type parameter T. |
| * @param method the method |
| */ |
| private void checkTypeParameter(Method method) { |
| TypeVariable<Method> typeParameter = getTypeParameter(method); |
| assertEquals("T", typeParameter.getName()); |
| assertEquals(method, typeParameter.getGenericDeclaration()); |
| } |
| |
| /** |
| * Tests whether the specified method declares a parameter with the |
| * type of the type parameter. |
| * @param method the method |
| */ |
| private void checkParameterType(Method method) { |
| TypeVariable<Method> typeParameter = getTypeParameter(method); |
| assertLenghtOne(method.getGenericParameterTypes()); |
| Type genericParameterType = method.getGenericParameterTypes()[0]; |
| assertEquals(typeParameter, genericParameterType); |
| assertInstanceOf(TypeVariable.class, genericParameterType); |
| assertEquals(method, ((TypeVariable<?>) genericParameterType).getGenericDeclaration()); |
| } |
| |
| /** |
| * Tests whether the type of the return type is the declared type parameter. |
| * @param method the declaring method |
| */ |
| private void checkReturnType(Method method) { |
| TypeVariable<Method> typeParameter = getTypeParameter(method); |
| Type genericReturnType = method.getGenericReturnType(); |
| assertEquals(typeParameter, genericReturnType); |
| assertInstanceOf(TypeVariable.class, genericReturnType); |
| assertEquals(method, ((TypeVariable<?>) genericReturnType).getGenericDeclaration()); |
| } |
| public void testNoParamNoReturn() throws Exception { |
| Method method = clazz.getMethod("noParamNoReturn"); |
| checkTypeParameter(method); |
| } |
| |
| public void testParamNoReturn() throws Exception { |
| Method method = clazz.getMethod("paramNoReturn", Object.class); |
| checkTypeParameter(method); |
| checkParameterType(method); |
| } |
| |
| public void testNoParamReturn() throws Exception { |
| Method method = clazz.getMethod("noParamReturn"); |
| checkTypeParameter(method); |
| assertLenghtZero(method.getGenericParameterTypes()); |
| checkReturnType(method); |
| } |
| public void testParamReturn() throws Exception { |
| Method method = clazz.getMethod("paramReturn", Object.class); |
| checkTypeParameter(method); |
| checkParameterType(method); |
| checkReturnType(method); |
| } |
| public void testIndependencyOfMethodTypeParameters() throws Exception { |
| Method method0 = clazz.getMethod("paramNoReturn", Object.class); |
| TypeVariable<Method> typeParameter0 = method0.getTypeParameters()[0]; |
| |
| Method method1 = clazz.getMethod("noParamNoReturn"); |
| TypeVariable<Method> typeParameter1 = method1.getTypeParameters()[0]; |
| |
| //Generic method type parameters NAMES are equal |
| assertEquals(typeParameter0.getName(), typeParameter1.getName()); |
| //Generic method type PARAMETERS are not equal |
| assertNotEquals(typeParameter0, typeParameter1); |
| } |
| } |