| /* |
| * Copyright (C) 2010 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 libcore.java.lang.reflect; |
| |
| import java.lang.reflect.Method; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| import junit.framework.TestCase; |
| |
| public class MethodOverridesTest extends TestCase { |
| |
| public void testName() throws NoSuchMethodException { |
| Method method = StringBuilder.class.getMethod("append", char.class); |
| assertEquals("append", method.getName()); |
| } |
| |
| public void testParameterTypes() throws NoSuchMethodException { |
| Method method = StringBuilder.class.getMethod("append", char.class); |
| assertEquals(Arrays.<Class<?>>asList(char.class), |
| Arrays.asList(method.getParameterTypes())); |
| } |
| |
| public void testDeclaringClass() throws NoSuchMethodException { |
| Method method = StringBuilder.class.getMethod("append", char.class); |
| assertEquals(StringBuilder.class, method.getDeclaringClass()); |
| } |
| |
| public void testReturnType() throws NoSuchMethodException { |
| Method method = StringBuilder.class.getMethod("append", char.class); |
| assertEquals(StringBuilder.class, method.getReturnType()); |
| } |
| |
| public void testThrownExceptions() throws NoSuchMethodException { |
| Method method = StringBuilder.class.getMethod("append", char.class); |
| assertEquals(Collections.<Class<?>>emptyList(), Arrays.asList(method.getExceptionTypes())); |
| } |
| |
| public void testGetMethodsIncludesInheritedMethods() { |
| Set<String> signatures = signatures(Sub.class.getMethods()); |
| assertContains(signatures, "void notOverridden[] throws []"); |
| } |
| |
| public void testGetDeclaredMethodsDoesNotIncludeInheritedMethods() { |
| Set<String> signatures = signatures(Sub.class.getDeclaredMethods()); |
| assertFalse(signatures.contains("void notOverridden[] throws []")); |
| } |
| |
| public void testGetDeclaringClassReturnsOverridingClass() throws NoSuchMethodException { |
| assertEquals(Sub.class, Sub.class.getMethod("unchanged").getDeclaringClass()); |
| assertEquals(Sub.class, Sub.class.getDeclaredMethod("unchanged").getDeclaringClass()); |
| } |
| |
| public void testGetMethodsDoesNotIncludeExceptionChanges() throws NoSuchMethodException { |
| Set<String> signatures = signatures(Sub.class.getMethods()); |
| assertContains(signatures, "void thrower[] throws []"); |
| assertFalse(signatures.contains("void thrower[] throws [java.lang.Exception]")); |
| assertEquals(Sub.class, Sub.class.getMethod("thrower").getDeclaringClass()); |
| } |
| |
| public void testGetMethodsIncludesSyntheticMethods() throws NoSuchMethodException { |
| Set<String> signatures = signatures(Sub.class.getMethods()); |
| assertContains(signatures, "java.lang.String returner[] throws []"); |
| assertContains(signatures, "java.lang.Object returner[] throws []"); |
| |
| Method method = Sub.class.getMethod("returner"); |
| assertEquals(Sub.class, method.getDeclaringClass()); |
| assertFalse(method.isSynthetic()); |
| } |
| |
| public void testGetDeclaredMethodsIncludesSyntheticMethods() throws NoSuchMethodException { |
| Set<String> signatures = signatures(Sub.class.getDeclaredMethods()); |
| assertContains(signatures, "java.lang.String returner[] throws []"); |
| assertContains(signatures, "java.lang.Object returner[] throws []"); |
| |
| Method method = Sub.class.getMethod("returner"); |
| assertEquals(Sub.class, method.getDeclaringClass()); |
| assertFalse(method.isSynthetic()); |
| } |
| |
| public void testSubclassChangesVisibility() throws NoSuchMethodException { |
| Method[] methods = Sub.class.getMethods(); |
| int count = 0; |
| for (Method method : methods) { |
| if (signature(method).equals("void visibility[] throws []")) { |
| assertEquals(Sub.class, method.getDeclaringClass()); |
| assertFalse(method.isSynthetic()); |
| count++; |
| } |
| } |
| assertEquals(1, count); |
| |
| Method method = Sub.class.getMethod("visibility"); |
| assertEquals(Sub.class, method.getDeclaringClass()); |
| assertFalse(method.isSynthetic()); |
| } |
| |
| public void testMoreVisibleSubclassChangesVisibility() throws NoSuchMethodException { |
| Method[] methods = PublicSub.class.getMethods(); |
| int count = 0; |
| for (Method method : methods) { |
| if (signature(method).equals("void unchanged[] throws []")) { |
| assertEquals(PublicSub.class, method.getDeclaringClass()); |
| assertTrue(method.isSynthetic()); |
| count++; |
| } |
| } |
| assertEquals(1, count); |
| |
| Method method = PublicSub.class.getMethod("unchanged"); |
| assertEquals(PublicSub.class, method.getDeclaringClass()); |
| assertTrue(method.isSynthetic()); |
| } |
| |
| public static class Super { |
| public void notOverridden() {} |
| public void unchanged() {} |
| public void thrower() throws Exception {} |
| public Object returner() { |
| return null; |
| } |
| protected void visibility() {} |
| } |
| |
| public static class Sub extends Super { |
| @Override public void unchanged() {} |
| @Override public void thrower() {} |
| @Override public String returner() { |
| return null; |
| } |
| @Override public void visibility() {} |
| } |
| |
| static class PackageSuper { |
| public void unchanged() {} |
| } |
| |
| public static class PublicSub extends PackageSuper {} |
| |
| /** |
| * Returns a method signature of this form: |
| * {@code java.lang.String concat[class java.lang.String] throws []}. |
| */ |
| private String signature(Method method) { |
| return method.getReturnType().getName() + " " + method.getName() |
| + Arrays.toString(method.getParameterTypes()) |
| + " throws " + Arrays.toString(method.getExceptionTypes()); |
| } |
| |
| private Set<String> signatures(Method[] methods) { |
| Set<String> signatures = new HashSet<String>(); |
| for (Method method : methods) { |
| signatures.add(signature(method)); |
| } |
| return signatures; |
| } |
| |
| private <T> void assertContains(Collection<T> elements, T value) { |
| assertTrue("Expected " + value + " in " + elements, elements.contains(value)); |
| } |
| } |