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