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16 package org.apache.ibatis.reflection;
17
18 import static org.junit.jupiter.api.Assertions.*;
19
20 import java.lang.reflect.Field;
21 import java.lang.reflect.GenericArrayType;
22 import java.lang.reflect.Method;
23 import java.lang.reflect.ParameterizedType;
24 import java.lang.reflect.Type;
25 import java.lang.reflect.WildcardType;
26 import java.util.Date;
27 import java.util.List;
28 import java.util.Map;
29 import java.util.concurrent.ExecutorService;
30 import java.util.concurrent.Executors;
31 import java.util.concurrent.Future;
32
33 import org.apache.ibatis.reflection.typeparam.Calculator;
34 import org.apache.ibatis.reflection.typeparam.Calculator.SubCalculator;
35 import org.apache.ibatis.reflection.typeparam.Level0Mapper;
36 import org.apache.ibatis.reflection.typeparam.Level0Mapper.Level0InnerMapper;
37 import org.apache.ibatis.reflection.typeparam.Level1Mapper;
38 import org.apache.ibatis.reflection.typeparam.Level2Mapper;
39 import org.junit.jupiter.api.Test;
40
41 class TypeParameterResolverTest {
42 @Test
43 void testReturn_Lv0SimpleClass() throws Exception {
44 Class<?> clazz = Level0Mapper.class;
45 Method method = clazz.getMethod("simpleSelect");
46 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
47 assertEquals(Double.class, result);
48 }
49
50 @Test
51 void testReturn_SimpleVoid() throws Exception {
52 Class<?> clazz = Level1Mapper.class;
53 Method method = clazz.getMethod("simpleSelectVoid", Integer.class);
54 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
55 assertEquals(void.class, result);
56 }
57
58 @Test
59 void testReturn_SimplePrimitive() throws Exception {
60 Class<?> clazz = Level1Mapper.class;
61 Method method = clazz.getMethod("simpleSelectPrimitive", int.class);
62 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
63 assertEquals(double.class, result);
64 }
65
66 @Test
67 void testReturn_SimpleClass() throws Exception {
68 Class<?> clazz = Level1Mapper.class;
69 Method method = clazz.getMethod("simpleSelect");
70 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
71 assertEquals(Double.class, result);
72 }
73
74 @Test
75 void testReturn_SimpleList() throws Exception {
76 Class<?> clazz = Level1Mapper.class;
77 Method method = clazz.getMethod("simpleSelectList");
78 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
79 assertTrue(result instanceof ParameterizedType);
80 ParameterizedType paramType = (ParameterizedType) result;
81 assertEquals(List.class, paramType.getRawType());
82 assertEquals(1, paramType.getActualTypeArguments().length);
83 assertEquals(Double.class, paramType.getActualTypeArguments()[0]);
84 }
85
86 @Test
87 void testReturn_SimpleMap() throws Exception {
88 Class<?> clazz = Level1Mapper.class;
89 Method method = clazz.getMethod("simpleSelectMap");
90 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
91 assertTrue(result instanceof ParameterizedType);
92 ParameterizedType paramType = (ParameterizedType) result;
93 assertEquals(Map.class, paramType.getRawType());
94 assertEquals(2, paramType.getActualTypeArguments().length);
95 assertEquals(Integer.class, paramType.getActualTypeArguments()[0]);
96 assertEquals(Double.class, paramType.getActualTypeArguments()[1]);
97 }
98
99 @Test
100 void testReturn_SimpleWildcard() throws Exception {
101 Class<?> clazz = Level1Mapper.class;
102 Method method = clazz.getMethod("simpleSelectWildcard");
103 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
104 assertTrue(result instanceof ParameterizedType);
105 ParameterizedType paramType = (ParameterizedType) result;
106 assertEquals(List.class, paramType.getRawType());
107 assertEquals(1, paramType.getActualTypeArguments().length);
108 assertTrue(paramType.getActualTypeArguments()[0] instanceof WildcardType);
109 WildcardType wildcard = (WildcardType) paramType.getActualTypeArguments()[0];
110 assertEquals(String.class, wildcard.getUpperBounds()[0]);
111 }
112
113 @Test
114 void testReturn_SimpleArray() throws Exception {
115 Class<?> clazz = Level1Mapper.class;
116 Method method = clazz.getMethod("simpleSelectArray");
117 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
118 assertTrue(result instanceof Class);
119 Class<?> resultClass = (Class<?>) result;
120 assertTrue(resultClass.isArray());
121 assertEquals(String.class, resultClass.getComponentType());
122 }
123
124 @Test
125 void testReturn_SimpleArrayOfArray() throws Exception {
126 Class<?> clazz = Level1Mapper.class;
127 Method method = clazz.getMethod("simpleSelectArrayOfArray");
128 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
129 assertTrue(result instanceof Class);
130 Class<?> resultClass = (Class<?>) result;
131 assertTrue(resultClass.isArray());
132 assertTrue(resultClass.getComponentType().isArray());
133 assertEquals(String.class, resultClass.getComponentType().getComponentType());
134 }
135
136 @Test
137 void testReturn_SimpleTypeVar() throws Exception {
138 Class<?> clazz = Level1Mapper.class;
139 Method method = clazz.getMethod("simpleSelectTypeVar");
140 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
141 assertTrue(result instanceof ParameterizedType);
142 ParameterizedType paramType = (ParameterizedType) result;
143 assertEquals(Calculator.class, paramType.getRawType());
144 assertEquals(1, paramType.getActualTypeArguments().length);
145 assertTrue(paramType.getActualTypeArguments()[0] instanceof WildcardType);
146 }
147
148 @Test
149 void testReturn_Lv1Class() throws Exception {
150 Class<?> clazz = Level1Mapper.class;
151 Method method = clazz.getMethod("select", Object.class);
152 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
153 assertEquals(String.class, result);
154 }
155
156 @Test
157 void testReturn_Lv2CustomClass() throws Exception {
158 Class<?> clazz = Level2Mapper.class;
159 Method method = clazz.getMethod("selectCalculator", Calculator.class);
160 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
161 assertTrue(result instanceof ParameterizedType);
162 ParameterizedType paramType = (ParameterizedType) result;
163 assertEquals(Calculator.class, paramType.getRawType());
164 assertEquals(1, paramType.getActualTypeArguments().length);
165 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
166 }
167
168 @Test
169 void testReturn_Lv2CustomClassList() throws Exception {
170 Class<?> clazz = Level2Mapper.class;
171 Method method = clazz.getMethod("selectCalculatorList");
172 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
173 assertTrue(result instanceof ParameterizedType);
174 ParameterizedType paramTypeOuter = (ParameterizedType) result;
175 assertEquals(List.class, paramTypeOuter.getRawType());
176 assertEquals(1, paramTypeOuter.getActualTypeArguments().length);
177 ParameterizedType paramTypeInner = (ParameterizedType) paramTypeOuter.getActualTypeArguments()[0];
178 assertEquals(Calculator.class, paramTypeInner.getRawType());
179 assertEquals(Date.class, paramTypeInner.getActualTypeArguments()[0]);
180 }
181
182 @Test
183 void testReturn_Lv0InnerClass() throws Exception {
184 Class<?> clazz = Level0InnerMapper.class;
185 Method method = clazz.getMethod("select", Object.class);
186 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
187 assertEquals(Float.class, result);
188 }
189
190 @Test
191 void testReturn_Lv2Class() throws Exception {
192 Class<?> clazz = Level2Mapper.class;
193 Method method = clazz.getMethod("select", Object.class);
194 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
195 assertEquals(String.class, result);
196 }
197
198 @Test
199 void testReturn_Lv1List() throws Exception {
200 Class<?> clazz = Level1Mapper.class;
201 Method method = clazz.getMethod("selectList", Object.class, Object.class);
202 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
203 assertTrue(result instanceof ParameterizedType);
204 ParameterizedType type = (ParameterizedType) result;
205 assertEquals(List.class, type.getRawType());
206 assertEquals(1, type.getActualTypeArguments().length);
207 assertEquals(String.class, type.getActualTypeArguments()[0]);
208 }
209
210 @Test
211 void testReturn_Lv1Array() throws Exception {
212 Class<?> clazz = Level1Mapper.class;
213 Method method = clazz.getMethod("selectArray", List[].class);
214 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
215 assertTrue(result instanceof Class);
216 Class<?> resultClass = (Class<?>) result;
217 assertTrue(resultClass.isArray());
218 assertEquals(String.class, resultClass.getComponentType());
219 }
220
221 @Test
222 void testReturn_Lv2ArrayOfArray() throws Exception {
223 Class<?> clazz = Level2Mapper.class;
224 Method method = clazz.getMethod("selectArrayOfArray");
225 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
226 assertTrue(result instanceof Class);
227 Class<?> resultClass = (Class<?>) result;
228 assertTrue(result instanceof Class);
229 assertTrue(resultClass.isArray());
230 assertTrue(resultClass.getComponentType().isArray());
231 assertEquals(String.class, resultClass.getComponentType().getComponentType());
232 }
233
234 @Test
235 void testReturn_Lv2ArrayOfList() throws Exception {
236 Class<?> clazz = Level2Mapper.class;
237 Method method = clazz.getMethod("selectArrayOfList");
238 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
239 assertTrue(result instanceof GenericArrayType);
240 GenericArrayType genericArrayType = (GenericArrayType) result;
241 assertTrue(genericArrayType.getGenericComponentType() instanceof ParameterizedType);
242 ParameterizedType paramType = (ParameterizedType) genericArrayType.getGenericComponentType();
243 assertEquals(List.class, paramType.getRawType());
244 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
245 }
246
247 @Test
248 void testReturn_Lv2WildcardList() throws Exception {
249 Class<?> clazz = Level2Mapper.class;
250 Method method = clazz.getMethod("selectWildcardList");
251 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
252 assertTrue(result instanceof ParameterizedType);
253 ParameterizedType type = (ParameterizedType) result;
254 assertEquals(List.class, type.getRawType());
255 assertEquals(1, type.getActualTypeArguments().length);
256 assertTrue(type.getActualTypeArguments()[0] instanceof WildcardType);
257 WildcardType wildcard = (WildcardType) type.getActualTypeArguments()[0];
258 assertEquals(0, wildcard.getLowerBounds().length);
259 assertEquals(1, wildcard.getUpperBounds().length);
260 assertEquals(String.class, wildcard.getUpperBounds()[0]);
261 }
262
263 @Test
264 void testReturn_LV2Map() throws Exception {
265 Class<?> clazz = Level2Mapper.class;
266 Method method = clazz.getMethod("selectMap");
267 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
268 assertTrue(result instanceof ParameterizedType);
269 ParameterizedType paramType = (ParameterizedType) result;
270 assertEquals(Map.class, paramType.getRawType());
271 assertEquals(2, paramType.getActualTypeArguments().length);
272 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
273 assertEquals(Integer.class, paramType.getActualTypeArguments()[1]);
274 }
275
276 @Test
277 void testReturn_Subclass() throws Exception {
278 Class<?> clazz = SubCalculator.class;
279 Method method = clazz.getMethod("getId");
280 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
281 assertEquals(String.class, result);
282 }
283
284 @Test
285 void testParam_Primitive() throws Exception {
286 Class<?> clazz = Level2Mapper.class;
287 Method method = clazz.getMethod("simpleSelectPrimitive", int.class);
288 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
289 assertEquals(1, result.length);
290 assertEquals(int.class, result[0]);
291 }
292
293 @Test
294 void testParam_Simple() throws Exception {
295 Class<?> clazz = Level1Mapper.class;
296 Method method = clazz.getMethod("simpleSelectVoid", Integer.class);
297 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
298 assertEquals(1, result.length);
299 assertEquals(Integer.class, result[0]);
300 }
301
302 @Test
303 void testParam_Lv1Single() throws Exception {
304 Class<?> clazz = Level1Mapper.class;
305 Method method = clazz.getMethod("select", Object.class);
306 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
307 assertEquals(1, result.length);
308 assertEquals(String.class, result[0]);
309 }
310
311 @Test
312 void testParam_Lv2Single() throws Exception {
313 Class<?> clazz = Level2Mapper.class;
314 Method method = clazz.getMethod("select", Object.class);
315 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
316 assertEquals(1, result.length);
317 assertEquals(String.class, result[0]);
318 }
319
320 @Test
321 void testParam_Lv2Multiple() throws Exception {
322 Class<?> clazz = Level2Mapper.class;
323 Method method = clazz.getMethod("selectList", Object.class, Object.class);
324 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
325 assertEquals(2, result.length);
326 assertEquals(Integer.class, result[0]);
327 assertEquals(String.class, result[1]);
328 }
329
330 @Test
331 void testParam_Lv2CustomClass() throws Exception {
332 Class<?> clazz = Level2Mapper.class;
333 Method method = clazz.getMethod("selectCalculator", Calculator.class);
334 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
335 assertEquals(1, result.length);
336 assertTrue(result[0] instanceof ParameterizedType);
337 ParameterizedType paramType = (ParameterizedType) result[0];
338 assertEquals(Calculator.class, paramType.getRawType());
339 assertEquals(1, paramType.getActualTypeArguments().length);
340 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
341 }
342
343 @Test
344 void testParam_Lv1Array() throws Exception {
345 Class<?> clazz = Level1Mapper.class;
346 Method method = clazz.getMethod("selectArray", List[].class);
347 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
348 assertTrue(result[0] instanceof GenericArrayType);
349 GenericArrayType genericArrayType = (GenericArrayType) result[0];
350 assertTrue(genericArrayType.getGenericComponentType() instanceof ParameterizedType);
351 ParameterizedType paramType = (ParameterizedType) genericArrayType.getGenericComponentType();
352 assertEquals(List.class, paramType.getRawType());
353 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
354 }
355
356 @Test
357 void testParam_Subclass() throws Exception {
358 Class<?> clazz = SubCalculator.class;
359 Method method = clazz.getMethod("setId", Object.class);
360 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
361 assertEquals(String.class, result[0]);
362 }
363
364 @Test
365 void testReturn_Anonymous() throws Exception {
366 Calculator<?> instance = new Calculator<Integer>();
367 Class<?> clazz = instance.getClass();
368 Method method = clazz.getMethod("getId");
369 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
370 assertEquals(Object.class, result);
371 }
372
373 @Test
374 void testField_GenericField() throws Exception {
375 Class<?> clazz = SubCalculator.class;
376 Class<?> declaredClass = Calculator.class;
377 Field field = declaredClass.getDeclaredField("fld");
378 Type result = TypeParameterResolver.resolveFieldType(field, clazz);
379 assertEquals(String.class, result);
380 }
381
382 @Test
383 void testReturnParam_WildcardWithUpperBounds() throws Exception {
384 class Key {
385 }
386 @SuppressWarnings("unused")
387 class KeyBean<S extends Key & Cloneable, T extends Key> {
388 private S key1;
389 private T key2;
390
391 public S getKey1() {
392 return key1;
393 }
394
395 public void setKey1(S key1) {
396 this.key1 = key1;
397 }
398
399 public T getKey2() {
400 return key2;
401 }
402
403 public void setKey2(T key2) {
404 this.key2 = key2;
405 }
406 }
407 Class<?> clazz = KeyBean.class;
408 Method getter1 = clazz.getMethod("getKey1");
409 assertEquals(Key.class, TypeParameterResolver.resolveReturnType(getter1, clazz));
410 Method setter1 = clazz.getMethod("setKey1", Key.class);
411 assertEquals(Key.class, TypeParameterResolver.resolveParamTypes(setter1, clazz)[0]);
412 Method getter2 = clazz.getMethod("getKey2");
413 assertEquals(Key.class, TypeParameterResolver.resolveReturnType(getter2, clazz));
414 Method setter2 = clazz.getMethod("setKey2", Key.class);
415 assertEquals(Key.class, TypeParameterResolver.resolveParamTypes(setter2, clazz)[0]);
416 }
417
418 @Test
419 void testDeepHierarchy() throws Exception {
420 @SuppressWarnings("unused")
421 abstract class A<S> {
422 protected S id;
423 public S getId() { return this.id;}
424 public void setId(S id) {this.id = id;}
425 }
426 abstract class B<T> extends A<T> {}
427 abstract class C<U> extends B<U> {}
428 class D extends C<Integer> {}
429 Class<?> clazz = D.class;
430 Method method = clazz.getMethod("getId");
431 assertEquals(Integer.class, TypeParameterResolver.resolveReturnType(method, clazz));
432 Field field = A.class.getDeclaredField("id");
433 assertEquals(Integer.class, TypeParameterResolver.resolveFieldType(field, clazz));
434 }
435
436 @Test
437 void shouldTypeVariablesBeComparedWithEquals() throws Exception {
438
439 ExecutorService executor = Executors.newFixedThreadPool(2);
440 Future<Type> futureA = executor.submit(() -> {
441 Type retType = TypeParameterResolver.resolveReturnType(IfaceA.class.getMethods()[0], IfaceA.class);
442 return ((ParameterizedType) retType).getActualTypeArguments()[0];
443 });
444 Future<Type> futureB = executor.submit(() -> {
445 Type retType = TypeParameterResolver.resolveReturnType(IfaceB.class.getMethods()[0], IfaceB.class);
446 return ((ParameterizedType) retType).getActualTypeArguments()[0];
447 });
448 assertEquals(AA.class, futureA.get());
449 assertEquals(BB.class, futureB.get());
450 executor.shutdown();
451 }
452
453
454 class AA {}
455 class BB {}
456 interface IfaceA extends ParentIface<AA> {}
457 interface IfaceB extends ParentIface<BB> {}
458 interface ParentIface<T> {List<T> m();}
459
460 }