-
Notifications
You must be signed in to change notification settings - Fork 4.3k
/
TypeTokenTest.java
268 lines (231 loc) · 10.3 KB
/
TypeTokenTest.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/*
* Copyright (C) 2010 Google Inc.
*
* 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 com.google.gson.reflect;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.RandomAccess;
import java.util.Set;
import junit.framework.TestCase;
/**
* @author Jesse Wilson
*/
public final class TypeTokenTest extends TestCase {
// These fields are accessed using reflection by the tests below
List<Integer> listOfInteger = null;
List<Number> listOfNumber = null;
List<String> listOfString = null;
List<?> listOfUnknown = null;
List<Set<String>> listOfSetOfString = null;
List<Set<?>> listOfSetOfUnknown = null;
@SuppressWarnings({"deprecation"})
public void testIsAssignableFromRawTypes() {
assertTrue(TypeToken.get(Object.class).isAssignableFrom(String.class));
assertFalse(TypeToken.get(String.class).isAssignableFrom(Object.class));
assertTrue(TypeToken.get(RandomAccess.class).isAssignableFrom(ArrayList.class));
assertFalse(TypeToken.get(ArrayList.class).isAssignableFrom(RandomAccess.class));
}
@SuppressWarnings({"deprecation"})
public void testIsAssignableFromWithTypeParameters() throws Exception {
Type a = getClass().getDeclaredField("listOfInteger").getGenericType();
Type b = getClass().getDeclaredField("listOfNumber").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfInteger = listOfNumber; // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
// listOfNumber = listOfInteger; // doesn't compile; must be false
assertFalse(TypeToken.get(b).isAssignableFrom(a));
}
@SuppressWarnings({"deprecation"})
public void testIsAssignableFromWithBasicWildcards() throws Exception {
Type a = getClass().getDeclaredField("listOfString").getGenericType();
Type b = getClass().getDeclaredField("listOfUnknown").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfString = listOfUnknown // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
listOfUnknown = listOfString; // compiles; must be true
// The following assertion is too difficult to support reliably, so disabling
// assertTrue(TypeToken.get(b).isAssignableFrom(a));
}
@SuppressWarnings({"deprecation"})
public void testIsAssignableFromWithNestedWildcards() throws Exception {
Type a = getClass().getDeclaredField("listOfSetOfString").getGenericType();
Type b = getClass().getDeclaredField("listOfSetOfUnknown").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfSetOfString = listOfSetOfUnknown; // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
// listOfSetOfUnknown = listOfSetOfString; // doesn't compile; must be false
assertFalse(TypeToken.get(b).isAssignableFrom(a));
}
public void testArrayFactory() {
TypeToken<?> expectedStringArray = new TypeToken<String[]>() {};
assertEquals(expectedStringArray, TypeToken.getArray(String.class));
TypeToken<?> expectedListOfStringArray = new TypeToken<List<String>[]>() {};
Type listOfString = new TypeToken<List<String>>() {}.getType();
assertEquals(expectedListOfStringArray, TypeToken.getArray(listOfString));
try {
TypeToken.getArray(null);
fail();
} catch (NullPointerException e) {
}
}
public void testParameterizedFactory() {
TypeToken<?> expectedListOfString = new TypeToken<List<String>>() {};
assertEquals(expectedListOfString, TypeToken.getParameterized(List.class, String.class));
TypeToken<?> expectedMapOfStringToString = new TypeToken<Map<String, String>>() {};
assertEquals(expectedMapOfStringToString, TypeToken.getParameterized(Map.class, String.class, String.class));
TypeToken<?> expectedListOfListOfListOfString = new TypeToken<List<List<List<String>>>>() {};
Type listOfString = TypeToken.getParameterized(List.class, String.class).getType();
Type listOfListOfString = TypeToken.getParameterized(List.class, listOfString).getType();
assertEquals(expectedListOfListOfListOfString, TypeToken.getParameterized(List.class, listOfListOfString));
TypeToken<?> expectedWithExactArg = new TypeToken<GenericWithBound<Number>>() {};
assertEquals(expectedWithExactArg, TypeToken.getParameterized(GenericWithBound.class, Number.class));
TypeToken<?> expectedWithSubclassArg = new TypeToken<GenericWithBound<Integer>>() {};
assertEquals(expectedWithSubclassArg, TypeToken.getParameterized(GenericWithBound.class, Integer.class));
TypeToken<?> expectedSatisfyingTwoBounds = new TypeToken<GenericWithMultiBound<ClassSatisfyingBounds>>() {};
assertEquals(expectedSatisfyingTwoBounds, TypeToken.getParameterized(GenericWithMultiBound.class, ClassSatisfyingBounds.class));
}
public void testParameterizedFactory_Invalid() {
try {
TypeToken.getParameterized(null, new Type[0]);
fail();
} catch (NullPointerException e) {
}
GenericArrayType arrayType = (GenericArrayType) TypeToken.getArray(String.class).getType();
try {
TypeToken.getParameterized(arrayType, new Type[0]);
fail();
} catch (IllegalArgumentException e) {
assertEquals("rawType must be of type Class, but was java.lang.String[]", e.getMessage());
}
try {
TypeToken.getParameterized(String.class, String.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("java.lang.String requires 0 type arguments, but got 1", e.getMessage());
}
try {
TypeToken.getParameterized(List.class, new Type[0]);
fail();
} catch (IllegalArgumentException e) {
assertEquals("java.util.List requires 1 type arguments, but got 0", e.getMessage());
}
try {
TypeToken.getParameterized(List.class, String.class, String.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("java.util.List requires 1 type arguments, but got 2", e.getMessage());
}
try {
TypeToken.getParameterized(GenericWithBound.class, String.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("Type argument class java.lang.String does not satisfy bounds "
+ "for type variable T declared by " + GenericWithBound.class,
e.getMessage());
}
try {
TypeToken.getParameterized(GenericWithBound.class, Object.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("Type argument class java.lang.Object does not satisfy bounds "
+ "for type variable T declared by " + GenericWithBound.class,
e.getMessage());
}
try {
TypeToken.getParameterized(GenericWithMultiBound.class, Number.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("Type argument class java.lang.Number does not satisfy bounds "
+ "for type variable T declared by " + GenericWithMultiBound.class,
e.getMessage());
}
try {
TypeToken.getParameterized(GenericWithMultiBound.class, CharSequence.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("Type argument interface java.lang.CharSequence does not satisfy bounds "
+ "for type variable T declared by " + GenericWithMultiBound.class,
e.getMessage());
}
try {
TypeToken.getParameterized(GenericWithMultiBound.class, Object.class);
fail();
} catch (IllegalArgumentException e) {
assertEquals("Type argument class java.lang.Object does not satisfy bounds "
+ "for type variable T declared by " + GenericWithMultiBound.class,
e.getMessage());
}
}
private static class CustomTypeToken extends TypeToken<String> {
}
public void testTypeTokenNonAnonymousSubclass() {
TypeToken<?> typeToken = new CustomTypeToken();
assertEquals(String.class, typeToken.getRawType());
assertEquals(String.class, typeToken.getType());
}
/**
* User must only create direct subclasses of TypeToken, but not subclasses
* of subclasses (...) of TypeToken.
*/
public void testTypeTokenSubSubClass() {
class SubTypeToken<T> extends TypeToken<String> {}
class SubSubTypeToken1<T> extends SubTypeToken<T> {}
class SubSubTypeToken2 extends SubTypeToken<Integer> {}
try {
new SubTypeToken<Integer>() {};
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
try {
new SubSubTypeToken1<Integer>();
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
try {
new SubSubTypeToken2();
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
}
@SuppressWarnings("rawtypes")
public void testTypeTokenRaw() {
try {
new TypeToken() {};
fail();
} catch (IllegalStateException expected) {
assertEquals("TypeToken must be created with a type argument: new TypeToken<...>() {}; "
+ "When using code shrinkers (ProGuard, R8, ...) make sure that generic signatures are preserved.",
expected.getMessage());
}
}
}
// Have to declare these classes here as top-level classes because otherwise tests for
// TypeToken.getParameterized fail due to owner type mismatch
class GenericWithBound<T extends Number> {
}
class GenericWithMultiBound<T extends Number & CharSequence> {
}
@SuppressWarnings("serial")
abstract class ClassSatisfyingBounds extends Number implements CharSequence {
}