1 /** 2 * Copyright (C) 2008 Google Inc. 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 18 package com.google.inject.util; 19 20 import static com.google.inject.Asserts.assertContains; 21 import static com.google.inject.Asserts.assertEqualWhenReserialized; 22 import static com.google.inject.Asserts.assertEqualsBothWays; 23 import static com.google.inject.util.Types.subtypeOf; 24 import static com.google.inject.util.Types.supertypeOf; 25 26 import com.google.inject.TypeLiteral; 27 import com.google.inject.internal.MoreTypes; 28 29 import junit.framework.Assert; 30 import junit.framework.TestCase; 31 32 import java.io.IOException; 33 import java.lang.reflect.GenericArrayType; 34 import java.lang.reflect.ParameterizedType; 35 import java.lang.reflect.Type; 36 import java.lang.reflect.WildcardType; 37 import java.util.List; 38 import java.util.Map; 39 import java.util.Set; 40 41 /** 42 * @author jessewilson (at) google.com (Jesse Wilson) 43 */ 44 public class TypesTest extends TestCase { 45 46 // generic types for comparison 47 Map<String, Integer> a; 48 Inner<Float, Double> b; 49 List<Set<String>[][]> c; 50 List<String> d; 51 Set<String> e; 52 Outer<String>.Inner f; 53 54 private ParameterizedType mapStringInteger; 55 private ParameterizedType innerFloatDouble; 56 private ParameterizedType listSetStringArray; 57 private ParameterizedType listString; 58 private ParameterizedType setString; 59 private ParameterizedType outerInner; 60 private GenericArrayType setStringArray; 61 62 @Override 63 protected void setUp() throws Exception { 64 super.setUp(); 65 mapStringInteger = (ParameterizedType) getClass().getDeclaredField("a").getGenericType(); 66 innerFloatDouble = (ParameterizedType) getClass().getDeclaredField("b").getGenericType(); 67 listSetStringArray = (ParameterizedType) getClass().getDeclaredField("c").getGenericType(); 68 listString = (ParameterizedType) getClass().getDeclaredField("d").getGenericType(); 69 setString = (ParameterizedType) getClass().getDeclaredField("e").getGenericType(); 70 outerInner = (ParameterizedType) getClass().getDeclaredField("f").getGenericType(); 71 setStringArray = (GenericArrayType) listSetStringArray.getActualTypeArguments()[0]; 72 } 73 74 public void testListSetMap() { 75 assertEqualsBothWays(mapStringInteger, Types.mapOf(String.class, Integer.class)); 76 assertEqualsBothWays(listString, Types.listOf(String.class)); 77 assertEqualsBothWays(setString, Types.setOf(String.class)); 78 } 79 80 public void testDefensiveCopies() { 81 Type[] arguments = new Type[] { String.class, Integer.class }; 82 ParameterizedType parameterizedType = Types.newParameterizedType(Map.class, arguments); 83 arguments[0] = null; 84 assertEquals(String.class, parameterizedType.getActualTypeArguments()[0]); 85 parameterizedType.getActualTypeArguments()[1] = null; 86 assertEquals(Integer.class, parameterizedType.getActualTypeArguments()[1]); 87 } 88 89 public void testTypeWithOwnerType() { 90 ParameterizedType actual = Types.newParameterizedTypeWithOwner( 91 TypesTest.class, Inner.class, Float.class, Double.class); 92 assertEquals(TypesTest.class, actual.getOwnerType()); 93 assertEqualsBothWays(innerFloatDouble, actual); 94 // The JDK prints this out as: 95 // com.google.inject.util.TypesTest.com.google.inject.util.TypesTest$Inner<java.lang.Float, java.lang.Double> 96 // and we think that's wrong, so the assertEquals comparison is worthless. :-( 97 // assertEquals(innerFloatDouble.toString(), actual.toString()); 98 99 // We think the correct comparison is: 100 assertEquals("com.google.inject.util.TypesTest$Inner<java.lang.Float, java.lang.Double>", actual.toString()); 101 } 102 103 public void testTypeParametersMustNotBePrimitives() { 104 try { 105 Types.newParameterizedType(Map.class, String.class, int.class); 106 fail(); 107 } catch (IllegalArgumentException expected) { 108 assertContains(expected.getMessage(), 109 "Primitive types are not allowed in type parameters: int"); 110 } 111 } 112 113 public List<? extends CharSequence> wildcardExtends; 114 public List<? super CharSequence> wildcardSuper; 115 public List<?> wildcardObject; 116 117 public void testWildcardTypes() throws NoSuchFieldException, IOException { 118 assertEqualsBothWays(getWildcard("wildcardSuper"), supertypeOf(CharSequence.class)); 119 assertEqualsBothWays(getWildcard("wildcardExtends"), subtypeOf(CharSequence.class)); 120 assertEqualsBothWays(getWildcard("wildcardObject"), subtypeOf(Object.class)); 121 122 assertEquals("? super java.lang.CharSequence", supertypeOf(CharSequence.class).toString()); 123 assertEquals("? extends java.lang.CharSequence", subtypeOf(CharSequence.class).toString()); 124 assertEquals("?", subtypeOf(Object.class).toString()); 125 126 assertEqualWhenReserialized(supertypeOf(CharSequence.class)); 127 assertEqualWhenReserialized(subtypeOf(CharSequence.class)); 128 } 129 130 public void testWildcardBoundsMustNotBePrimitives() { 131 try { 132 supertypeOf(int.class); 133 fail(); 134 } catch (IllegalArgumentException expected) { 135 assertContains(expected.getMessage(), 136 "Primitive types are not allowed in wildcard bounds: int"); 137 } 138 139 try { 140 subtypeOf(int.class); 141 fail(); 142 } catch (IllegalArgumentException expected) { 143 assertContains(expected.getMessage(), 144 "Primitive types are not allowed in wildcard bounds: int"); 145 } 146 } 147 148 private WildcardType getWildcard(String fieldName) throws NoSuchFieldException { 149 ParameterizedType type = (ParameterizedType) getClass().getField(fieldName).getGenericType(); 150 return (WildcardType) type.getActualTypeArguments()[0]; 151 } 152 153 public void testEqualsAndHashcode() { 154 ParameterizedType parameterizedType 155 = Types.newParameterizedType(Map.class, String.class, Integer.class); 156 assertEqualsBothWays(mapStringInteger, parameterizedType); 157 assertEquals(mapStringInteger.toString(), parameterizedType.toString()); 158 159 GenericArrayType genericArrayType = Types.arrayOf(Types.arrayOf( 160 Types.newParameterizedType(Set.class, String.class))); 161 assertEqualsBothWays(setStringArray, genericArrayType); 162 assertEquals(setStringArray.toString(), genericArrayType.toString()); 163 } 164 165 public void testToString() { 166 Assert.assertEquals("java.lang.String", MoreTypes.typeToString(String.class)); 167 assertEquals("java.util.Set<java.lang.String>[][]", MoreTypes.typeToString(setStringArray)); 168 assertEquals("java.util.Map<java.lang.String, java.lang.Integer>", 169 MoreTypes.typeToString(mapStringInteger)); 170 assertEquals("java.util.List<java.util.Set<java.lang.String>[][]>", 171 MoreTypes.typeToString(listSetStringArray)); 172 assertEquals(innerFloatDouble.toString(), 173 MoreTypes.typeToString(innerFloatDouble)); 174 } 175 176 static class Owning<A> {} 177 178 /** 179 * Ensure that owning types are required when necessary, and forbidden 180 * otherwise. 181 */ 182 public void testCanonicalizeRequiresOwnerTypes() { 183 try { 184 Types.newParameterizedType(Owning.class, String.class); 185 fail(); 186 } catch (IllegalArgumentException expected) { 187 assertContains(expected.getMessage(), 188 "No owner type for enclosed " + Owning.class); 189 } 190 191 try { 192 Types.newParameterizedTypeWithOwner(Object.class, Set.class, String.class); 193 } catch (IllegalArgumentException expected) { 194 assertContains(expected.getMessage(), 195 "Owner type for unenclosed " + Set.class); 196 } 197 } 198 199 @SuppressWarnings("UnusedDeclaration") 200 class Inner<T1, T2> {} 201 202 public void testInnerParameterizedEvenWithZeroArgs() { 203 TypeLiteral<Outer<String>.Inner> type = new TypeLiteral<Outer<String>.Inner>() {}; 204 assertEqualsBothWays(outerInner, type.getType()); 205 206 ParameterizedType parameterizedType = (ParameterizedType) type.getType(); 207 assertEquals(0, parameterizedType.getActualTypeArguments().length); 208 assertEquals(new TypeLiteral<Outer<String>>() {}.getType(), parameterizedType.getOwnerType()); 209 assertEquals(Outer.Inner.class, parameterizedType.getRawType()); 210 } 211 212 static class Outer<T> { 213 class Inner {} 214 } 215 } 216
