/
GenericMetadataSupportTest.java
334 lines (265 loc) · 16.2 KB
/
GenericMetadataSupportTest.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
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/*
* Copyright (c) 2007 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
package org.mockito.internal.util.reflection;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.fail;
import static org.mockito.internal.util.reflection.GenericMetadataSupport.inferFrom;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Test;
public class GenericMetadataSupportTest {
interface GenericsSelfReference<T extends GenericsSelfReference<T>> {
T self();
}
interface UpperBoundedTypeWithClass<E extends Number & Comparable<E>> {
E get();
}
interface UpperBoundedTypeWithInterfaces<E extends Comparable<E> & Cloneable> {
E get();
}
interface ListOfNumbers extends List<Number> {
}
interface AnotherListOfNumbers extends ListOfNumbers {
}
abstract class ListOfNumbersImpl implements ListOfNumbers {
}
abstract class AnotherListOfNumbersImpl extends ListOfNumbersImpl {
}
interface ListOfAnyNumbers<N extends Number & Cloneable> extends List<N> {
}
interface GenericsNest<K extends Comparable<K> & Cloneable> extends Map<K, Set<Number>> {
Set<Number> remove(Object key); // override with fixed ParameterizedType
List<? super Integer> returning_wildcard_with_class_lower_bound();
List<? super K> returning_wildcard_with_typeVar_lower_bound();
List<? extends K> returning_wildcard_with_typeVar_upper_bound();
K returningK();
<O extends K> List<O> paramType_with_type_params();
<S, T extends S> T two_type_params();
<O extends K> O typeVar_with_type_params();
}
static class StringList extends ArrayList<String> {
}
public interface TopInterface<T> {
T generic();
}
public interface MiddleInterface<T> extends TopInterface<T> {
}
public class OwningClassWithDeclaredUpperBounds<T extends List<String> & Comparable<String> & Cloneable> {
public abstract class AbstractInner implements MiddleInterface<T> {
}
}
public class OwningClassWithNoDeclaredUpperBounds<T> {
public abstract class AbstractInner implements MiddleInterface<T> {
}
}
@Test
public void typeVariable_of_self_type() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsSelfReference.class).resolveGenericReturnType(firstNamedMethod("self", GenericsSelfReference.class));
assertThat(genericMetadata.rawType()).isEqualTo(GenericsSelfReference.class);
}
@Test
public void can_get_raw_type_from_Class() {
assertThat(inferFrom(ListOfAnyNumbers.class).rawType()).isEqualTo(ListOfAnyNumbers.class);
assertThat(inferFrom(ListOfNumbers.class).rawType()).isEqualTo(ListOfNumbers.class);
assertThat(inferFrom(GenericsNest.class).rawType()).isEqualTo(GenericsNest.class);
assertThat(inferFrom(StringList.class).rawType()).isEqualTo(StringList.class);
}
@Test
public void can_get_raw_type_from_ParameterizedType() {
assertThat(inferFrom(ListOfAnyNumbers.class.getGenericInterfaces()[0]).rawType()).isEqualTo(List.class);
assertThat(inferFrom(ListOfNumbers.class.getGenericInterfaces()[0]).rawType()).isEqualTo(List.class);
assertThat(inferFrom(GenericsNest.class.getGenericInterfaces()[0]).rawType()).isEqualTo(Map.class);
assertThat(inferFrom(StringList.class.getGenericSuperclass()).rawType()).isEqualTo(ArrayList.class);
}
@Test
public void can_get_type_variables_from_Class() {
assertThat(inferFrom(GenericsNest.class).actualTypeArguments().keySet()).hasSize(1).extracting("name").contains("K");
assertThat(inferFrom(ListOfNumbers.class).actualTypeArguments().keySet()).isEmpty();
assertThat(inferFrom(ListOfAnyNumbers.class).actualTypeArguments().keySet()).hasSize(1).extracting("name").contains("N");
assertThat(inferFrom(Map.class).actualTypeArguments().keySet()).hasSize(2).extracting("name").contains("K", "V");
assertThat(inferFrom(Serializable.class).actualTypeArguments().keySet()).isEmpty();
assertThat(inferFrom(StringList.class).actualTypeArguments().keySet()).isEmpty();
}
@Test
public void can_resolve_type_variables_from_ancestors() throws Exception {
Method listGet = List.class.getMethod("get", int.class);
assertThat(inferFrom(AnotherListOfNumbers.class).resolveGenericReturnType(listGet).rawType()).isEqualTo(Number.class);
assertThat(inferFrom(AnotherListOfNumbersImpl.class).resolveGenericReturnType(listGet).rawType()).isEqualTo(Number.class);
}
@Test
public void can_get_type_variables_from_ParameterizedType() {
assertThat(inferFrom(GenericsNest.class.getGenericInterfaces()[0]).actualTypeArguments().keySet()).hasSize(2).extracting("name").contains("K", "V");
assertThat(inferFrom(ListOfAnyNumbers.class.getGenericInterfaces()[0]).actualTypeArguments().keySet()).hasSize(1).extracting("name").contains("E");
assertThat(inferFrom(Integer.class.getGenericInterfaces()[0]).actualTypeArguments().keySet()).hasSize(1).extracting("name").contains("T");
assertThat(inferFrom(StringBuilder.class.getGenericInterfaces()[0]).actualTypeArguments().keySet()).isEmpty();
assertThat(inferFrom(StringList.class).actualTypeArguments().keySet()).isEmpty();
}
@Test
public void typeVariable_return_type_of____iterator____resolved_to_Iterator_and_type_argument_to_String() {
GenericMetadataSupport genericMetadata = inferFrom(StringList.class).resolveGenericReturnType(firstNamedMethod("iterator", StringList.class));
assertThat(genericMetadata.rawType()).isEqualTo(Iterator.class);
assertThat(genericMetadata.actualTypeArguments().values()).contains(String.class);
}
@Test
public void typeVariable_return_type_of____get____resolved_to_Set_and_type_argument_to_Number() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("get", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(Set.class);
assertThat(genericMetadata.actualTypeArguments().values()).contains(Number.class);
}
@Test
public void bounded_typeVariable_return_type_of____returningK____resolved_to_Comparable_and_with_BoundedType() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("returningK", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(Comparable.class);
GenericMetadataSupport extraInterface_0 = inferFrom(genericMetadata.extraInterfaces().get(0));
assertThat(extraInterface_0.rawType()).isEqualTo(Cloneable.class);
}
@Test
public void fixed_ParamType_return_type_of____remove____resolved_to_Set_and_type_argument_to_Number() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("remove", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(Set.class);
assertThat(genericMetadata.actualTypeArguments().values()).contains(Number.class);
}
@Test
public void paramType_return_type_of____values____resolved_to_Collection_and_type_argument_to_Parameterized_Set() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("values", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(Collection.class);
GenericMetadataSupport fromTypeVariableE = inferFrom(typeVariableValue(genericMetadata.actualTypeArguments(), "E"));
assertThat(fromTypeVariableE.rawType()).isEqualTo(Set.class);
assertThat(fromTypeVariableE.actualTypeArguments().values()).contains(Number.class);
}
@Test
public void paramType_with_type_parameters_return_type_of____paramType_with_type_params____resolved_to_Collection_and_type_argument_to_Parameterized_Set() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("paramType_with_type_params", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(List.class);
Type firstBoundOfE = ((GenericMetadataSupport.TypeVarBoundedType) typeVariableValue(genericMetadata.actualTypeArguments(), "E")).firstBound();
assertThat(inferFrom(firstBoundOfE).rawType()).isEqualTo(Comparable.class);
}
@Test
public void typeVariable_with_type_parameters_return_type_of____typeVar_with_type_params____resolved_K_hence_to_Comparable_and_with_BoundedType() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("typeVar_with_type_params", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(Comparable.class);
GenericMetadataSupport extraInterface_0 = inferFrom(genericMetadata.extraInterfaces().get(0));
assertThat(extraInterface_0.rawType()).isEqualTo(Cloneable.class);
}
@Test
public void class_return_type_of____append____resolved_to_StringBuilder_and_type_arguments() {
GenericMetadataSupport genericMetadata = inferFrom(StringBuilder.class).resolveGenericReturnType(firstNamedMethod("append", StringBuilder.class));
assertThat(genericMetadata.rawType()).isEqualTo(StringBuilder.class);
assertThat(genericMetadata.actualTypeArguments()).isEmpty();
}
@Test
public void paramType_with_wildcard_return_type_of____returning_wildcard_with_class_lower_bound____resolved_to_List_and_type_argument_to_Integer() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("returning_wildcard_with_class_lower_bound", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(List.class);
GenericMetadataSupport.BoundedType boundedType = (GenericMetadataSupport.BoundedType) typeVariableValue(genericMetadata.actualTypeArguments(), "E");
assertThat(boundedType.firstBound()).isEqualTo(Integer.class);
assertThat(boundedType.interfaceBounds()).isEmpty();
}
@Test
public void paramType_with_wildcard_return_type_of____returning_wildcard_with_typeVar_lower_bound____resolved_to_List_and_type_argument_to_Integer() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("returning_wildcard_with_typeVar_lower_bound", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(List.class);
GenericMetadataSupport.BoundedType boundedType = (GenericMetadataSupport.BoundedType) typeVariableValue(genericMetadata.actualTypeArguments(), "E");
assertThat(inferFrom(boundedType.firstBound()).rawType()).isEqualTo(Comparable.class);
assertThat(boundedType.interfaceBounds()).contains(Cloneable.class);
}
@Test
public void paramType_with_wildcard_return_type_of____returning_wildcard_with_typeVar_upper_bound____resolved_to_List_and_type_argument_to_Integer() {
GenericMetadataSupport genericMetadata = inferFrom(GenericsNest.class).resolveGenericReturnType(firstNamedMethod("returning_wildcard_with_typeVar_upper_bound", GenericsNest.class));
assertThat(genericMetadata.rawType()).isEqualTo(List.class);
GenericMetadataSupport.BoundedType boundedType = (GenericMetadataSupport.BoundedType) typeVariableValue(genericMetadata.actualTypeArguments(), "E");
assertThat(inferFrom(boundedType.firstBound()).rawType()).isEqualTo(Comparable.class);
assertThat(boundedType.interfaceBounds()).contains(Cloneable.class);
}
@Test
public void can_extract_raw_type_from_bounds_on_terminal_typeVariable() {
assertThat(inferFrom(OwningClassWithDeclaredUpperBounds.AbstractInner.class)
.resolveGenericReturnType(firstNamedMethod("generic", OwningClassWithDeclaredUpperBounds.AbstractInner.class))
.rawType()
).isEqualTo(List.class);
assertThat(inferFrom(OwningClassWithNoDeclaredUpperBounds.AbstractInner.class)
.resolveGenericReturnType(firstNamedMethod("generic", OwningClassWithNoDeclaredUpperBounds.AbstractInner.class))
.rawType()
).isEqualTo(Object.class);
}
@Test
public void can_extract_interface_type_from_bounds_on_terminal_typeVariable() {
assertThat(inferFrom(OwningClassWithDeclaredUpperBounds.AbstractInner.class)
.resolveGenericReturnType(firstNamedMethod("generic", OwningClassWithDeclaredUpperBounds.AbstractInner.class))
.rawExtraInterfaces()
).containsExactly(Comparable.class, Cloneable.class);
assertThat(inferFrom(OwningClassWithDeclaredUpperBounds.AbstractInner.class)
.resolveGenericReturnType(firstNamedMethod("generic", OwningClassWithDeclaredUpperBounds.AbstractInner.class))
.extraInterfaces()
).containsExactly(parameterizedTypeOf(Comparable.class, null, String.class),
Cloneable.class);
assertThat(inferFrom(OwningClassWithNoDeclaredUpperBounds.AbstractInner.class)
.resolveGenericReturnType(firstNamedMethod("generic", OwningClassWithNoDeclaredUpperBounds.AbstractInner.class))
.extraInterfaces()
).isEmpty();
}
@SuppressWarnings("EqualsHashCode")
private ParameterizedType parameterizedTypeOf(final Class<?> rawType, final Class<?> ownerType, final Type... actualTypeArguments) {
return new ParameterizedType() {
@Override
public Type[] getActualTypeArguments() {
return actualTypeArguments;
}
@Override
public Type getRawType() {
return rawType;
}
@Override
public Type getOwnerType() {
return ownerType;
}
public boolean equals(Object other) {
if (other instanceof ParameterizedType) {
ParameterizedType otherParamType = (ParameterizedType) other;
if (this == otherParamType) {
return true;
} else {
return equals(ownerType, otherParamType.getOwnerType())
&& equals(rawType, otherParamType.getRawType())
&& Arrays.equals(actualTypeArguments, otherParamType.getActualTypeArguments());
}
} else {
return false;
}
}
private boolean equals(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}
};
}
private Type typeVariableValue(Map<TypeVariable<?>, Type> typeVariables, String typeVariableName) {
for (Map.Entry<TypeVariable<?>, Type> typeVariableTypeEntry : typeVariables.entrySet()) {
if (typeVariableTypeEntry.getKey().getName().equals(typeVariableName)) {
return typeVariableTypeEntry.getValue();
}
}
fail("'" + typeVariableName + "' was not found in " + typeVariables);
return null; // unreachable
}
private Method firstNamedMethod(String methodName, Class<?> clazz) {
for (Method method : clazz.getMethods()) {
boolean protect_against_different_jdk_ordering_avoiding_bridge_methods = !method.isBridge();
if (method.getName().contains(methodName) && protect_against_different_jdk_ordering_avoiding_bridge_methods) {
return method;
}
}
throw new IllegalStateException("The method : '" + methodName + "' do not exist in '" + clazz.getSimpleName() + "'");
}
}