1 /* 2 * Copyright (C) 2009 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 17 package libcore.java.lang.reflect; 18 19 import java.lang.reflect.Constructor; 20 import java.lang.reflect.Parameter; 21 22 import junit.framework.TestCase; 23 24 public final class ConstructorTest extends TestCase { 25 public void test_getExceptionTypes() throws Exception { 26 Constructor<?> constructor = ConstructorTestHelper.class.getConstructor(new Class[0]); 27 Class[] exceptions = constructor.getExceptionTypes(); 28 assertEquals(1, exceptions.length); 29 assertEquals(IndexOutOfBoundsException.class, exceptions[0]); 30 // Check that corrupting our array doesn't affect other callers. 31 exceptions[0] = NullPointerException.class; 32 exceptions = constructor.getExceptionTypes(); 33 assertEquals(1, exceptions.length); 34 assertEquals(IndexOutOfBoundsException.class, exceptions[0]); 35 } 36 37 public void test_getParameterTypes() throws Exception { 38 Class[] expectedParameters = new Class[0]; 39 Constructor<?> constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 40 assertEquals(0, constructor.getParameterTypes().length); 41 42 expectedParameters = new Class[] { Object.class }; 43 constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 44 Class[] parameters = constructor.getParameterTypes(); 45 assertEquals(1, parameters.length); 46 assertEquals(expectedParameters[0], parameters[0]); 47 // Check that corrupting our array doesn't affect other callers. 48 parameters[0] = String.class; 49 parameters = constructor.getParameterTypes(); 50 assertEquals(1, parameters.length); 51 assertEquals(expectedParameters[0], parameters[0]); 52 } 53 54 public void test_getParameterCount() throws Exception { 55 Class[] expectedParameters = new Class[0]; 56 Constructor<?> constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 57 assertEquals(0, constructor.getParameterCount()); 58 59 expectedParameters = new Class[] { Object.class }; 60 constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 61 int count = constructor.getParameterCount(); 62 assertEquals(1, count); 63 } 64 65 public void test_getParameters() throws Exception { 66 Class[] expectedParameters = new Class[0]; 67 Constructor<?> constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 68 assertEquals(0, constructor.getParameters().length); 69 70 expectedParameters = new Class[] { Object.class }; 71 constructor = ConstructorTestHelper.class.getConstructor(expectedParameters); 72 73 // Test the information available via other Constructor methods. See ParameterTest and 74 // annotations.ParameterTest for more in-depth Parameter testing. 75 Parameter[] parameters = constructor.getParameters(); 76 assertEquals(1, parameters.length); 77 assertEquals(Object.class, parameters[0].getType()); 78 79 // Check that corrupting our array doesn't affect other callers. 80 parameters[0] = null; 81 parameters = constructor.getParameters(); 82 assertEquals(1, parameters.length); 83 assertEquals(Object.class, parameters[0].getType()); 84 } 85 86 public void testGetConstructorWithNullArgumentsArray() throws Exception { 87 Constructor<?> constructor = ConstructorTestHelper.class.getConstructor((Class[]) null); 88 assertEquals(0, constructor.getParameterTypes().length); 89 } 90 91 public void testGetConstructorWithNullArgument() throws Exception { 92 try { 93 ConstructorTestHelper.class.getConstructor(new Class[] { null }); 94 fail(); 95 } catch (NoSuchMethodException expected) { 96 } 97 } 98 99 public void testGetConstructorReturnsDoesNotReturnPrivateConstructor() throws Exception { 100 try { 101 ConstructorTestHelper.class.getConstructor(Object.class, Object.class); 102 fail(); 103 } catch (NoSuchMethodException expected) { 104 } 105 } 106 107 public void testGetDeclaredConstructorReturnsPrivateConstructor() throws Exception { 108 Constructor<?> constructor = ConstructorTestHelper.class.getDeclaredConstructor( 109 Object.class, Object.class); 110 assertEquals(2, constructor.getParameterTypes().length); 111 } 112 113 public void testEqualConstructorEqualsAndHashCode() throws Exception { 114 Constructor<?> c1 = ConstructorTestHelper.class.getConstructor(); 115 Constructor<?> c2 = ConstructorTestHelper.class.getConstructor(); 116 assertEquals(c1, c2); 117 assertEquals(c1.hashCode(), c2.hashCode()); 118 } 119 120 public void testHashCodeSpec() throws Exception { 121 Constructor<?> c1 = ConstructorTestHelper.class.getConstructor(); 122 assertEquals(ConstructorTestHelper.class.getName().hashCode(), c1.hashCode()); 123 } 124 125 public void testDifferentConstructorEqualsAndHashCode() throws Exception { 126 Constructor<?> c1 = ConstructorTestHelper.class.getConstructor(); 127 Constructor<?> c2 = ConstructorTestHelper.class.getConstructor(Object.class); 128 assertFalse(c1.equals(c2)); 129 } 130 131 public void testToString() throws Exception { 132 checkToString( 133 "public libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper() throws java.lang.IndexOutOfBoundsException", 134 ConstructorTestHelper.class); 135 checkToString( 136 "public libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper(java.lang.Object)", 137 ConstructorTestHelper.class, Object.class); 138 checkToString( 139 "private libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper(java.lang.Object,java.lang.Object)", 140 ConstructorTestHelper.class, Object.class, Object.class); 141 checkToString( 142 "public libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper() throws java.lang.Exception", 143 GenericConstructorTestHelper.class); 144 checkToString( 145 "public libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper(java.lang.String)", 146 GenericConstructorTestHelper.class, String.class); 147 checkToString( 148 "public libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper(java.lang.String,java.lang.Integer)", 149 GenericConstructorTestHelper.class, String.class, Integer.class); 150 } 151 152 private static void checkToString(String expected, Class<?> clazz, Class... constructorArgTypes) 153 throws Exception { 154 Constructor c = clazz.getDeclaredConstructor(constructorArgTypes); 155 assertEquals(expected, c.toString()); 156 } 157 158 public void testToGenericString() throws Exception { 159 checkToGenericString( 160 "public libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper() throws java.lang.IndexOutOfBoundsException", 161 ConstructorTestHelper.class); 162 checkToGenericString( 163 "public libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper(java.lang.Object)", 164 ConstructorTestHelper.class, Object.class); 165 checkToGenericString( 166 "private libcore.java.lang.reflect.ConstructorTest$ConstructorTestHelper(java.lang.Object,java.lang.Object)", 167 ConstructorTestHelper.class, Object.class, Object.class); 168 checkToGenericString( 169 "public libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper() throws E", 170 GenericConstructorTestHelper.class); 171 checkToGenericString( 172 "public libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper(A)", 173 GenericConstructorTestHelper.class, String.class); 174 checkToGenericString( 175 "public <B> libcore.java.lang.reflect.ConstructorTest$GenericConstructorTestHelper(A,B)", 176 GenericConstructorTestHelper.class, String.class, Integer.class); 177 } 178 179 private static void checkToGenericString(String expected, Class<?> clazz, 180 Class... constructorArgTypes) throws Exception { 181 Constructor c = clazz.getDeclaredConstructor(constructorArgTypes); 182 assertEquals(expected, c.toGenericString()); 183 } 184 185 static class ConstructorTestHelper { 186 public ConstructorTestHelper() throws IndexOutOfBoundsException { } 187 public ConstructorTestHelper(Object o) { } 188 private ConstructorTestHelper(Object a, Object b) { } 189 } 190 191 static class GenericConstructorTestHelper<A extends String, E extends Exception> { 192 public GenericConstructorTestHelper() throws E { } 193 public GenericConstructorTestHelper(A a) { } 194 public <B extends Integer> GenericConstructorTestHelper(A a, B b) { } 195 } 196 } 197
