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16 package org.apache.ibatis.reflection;
17
18 import static org.junit.jupiter.api.Assertions.assertEquals;
19 import static org.junit.jupiter.api.Assertions.assertTrue;
20
21 import java.lang.reflect.Field;
22 import java.lang.reflect.GenericArrayType;
23 import java.lang.reflect.Method;
24 import java.lang.reflect.ParameterizedType;
25 import java.lang.reflect.Type;
26 import java.lang.reflect.WildcardType;
27 import java.util.Date;
28 import java.util.List;
29 import java.util.Map;
30 import java.util.concurrent.ExecutorService;
31 import java.util.concurrent.Executors;
32 import java.util.concurrent.Future;
33
34 import org.apache.ibatis.reflection.typeparam.Calculator;
35 import org.apache.ibatis.reflection.typeparam.Calculator.SubCalculator;
36 import org.apache.ibatis.reflection.typeparam.Level0Mapper;
37 import org.apache.ibatis.reflection.typeparam.Level0Mapper.Level0InnerMapper;
38 import org.apache.ibatis.reflection.typeparam.Level1Mapper;
39 import org.apache.ibatis.reflection.typeparam.Level2Mapper;
40 import org.junit.jupiter.api.Test;
41
42 class TypeParameterResolverTest {
43 @Test
44 void testReturn_Lv0SimpleClass() throws Exception {
45 Class<?> clazz = Level0Mapper.class;
46 Method method = clazz.getMethod("simpleSelect");
47 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
48 assertEquals(Double.class, result);
49 }
50
51 @Test
52 void testReturn_SimpleVoid() throws Exception {
53 Class<?> clazz = Level1Mapper.class;
54 Method method = clazz.getMethod("simpleSelectVoid", Integer.class);
55 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
56 assertEquals(void.class, result);
57 }
58
59 @Test
60 void testReturn_SimplePrimitive() throws Exception {
61 Class<?> clazz = Level1Mapper.class;
62 Method method = clazz.getMethod("simpleSelectPrimitive", int.class);
63 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
64 assertEquals(double.class, result);
65 }
66
67 @Test
68 void testReturn_SimpleClass() throws Exception {
69 Class<?> clazz = Level1Mapper.class;
70 Method method = clazz.getMethod("simpleSelect");
71 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
72 assertEquals(Double.class, result);
73 }
74
75 @Test
76 void testReturn_SimpleList() throws Exception {
77 Class<?> clazz = Level1Mapper.class;
78 Method method = clazz.getMethod("simpleSelectList");
79 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
80 assertTrue(result instanceof ParameterizedType);
81 ParameterizedType paramType = (ParameterizedType) result;
82 assertEquals(List.class, paramType.getRawType());
83 assertEquals(1, paramType.getActualTypeArguments().length);
84 assertEquals(Double.class, paramType.getActualTypeArguments()[0]);
85 }
86
87 @Test
88 void testReturn_SimpleMap() throws Exception {
89 Class<?> clazz = Level1Mapper.class;
90 Method method = clazz.getMethod("simpleSelectMap");
91 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
92 assertTrue(result instanceof ParameterizedType);
93 ParameterizedType paramType = (ParameterizedType) result;
94 assertEquals(Map.class, paramType.getRawType());
95 assertEquals(2, paramType.getActualTypeArguments().length);
96 assertEquals(Integer.class, paramType.getActualTypeArguments()[0]);
97 assertEquals(Double.class, paramType.getActualTypeArguments()[1]);
98 }
99
100 @Test
101 void testReturn_SimpleWildcard() throws Exception {
102 Class<?> clazz = Level1Mapper.class;
103 Method method = clazz.getMethod("simpleSelectWildcard");
104 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
105 assertTrue(result instanceof ParameterizedType);
106 ParameterizedType paramType = (ParameterizedType) result;
107 assertEquals(List.class, paramType.getRawType());
108 assertEquals(1, paramType.getActualTypeArguments().length);
109 assertTrue(paramType.getActualTypeArguments()[0] instanceof WildcardType);
110 WildcardType wildcard = (WildcardType) paramType.getActualTypeArguments()[0];
111 assertEquals(String.class, wildcard.getUpperBounds()[0]);
112 }
113
114 @Test
115 void testReturn_SimpleArray() throws Exception {
116 Class<?> clazz = Level1Mapper.class;
117 Method method = clazz.getMethod("simpleSelectArray");
118 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
119 assertTrue(result instanceof Class);
120 Class<?> resultClass = (Class<?>) result;
121 assertTrue(resultClass.isArray());
122 assertEquals(String.class, resultClass.getComponentType());
123 }
124
125 @Test
126 void testReturn_SimpleArrayOfArray() throws Exception {
127 Class<?> clazz = Level1Mapper.class;
128 Method method = clazz.getMethod("simpleSelectArrayOfArray");
129 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
130 assertTrue(result instanceof Class);
131 Class<?> resultClass = (Class<?>) result;
132 assertTrue(resultClass.isArray());
133 assertTrue(resultClass.getComponentType().isArray());
134 assertEquals(String.class, resultClass.getComponentType().getComponentType());
135 }
136
137 @Test
138 void testReturn_SimpleTypeVar() throws Exception {
139 Class<?> clazz = Level1Mapper.class;
140 Method method = clazz.getMethod("simpleSelectTypeVar");
141 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
142 assertTrue(result instanceof ParameterizedType);
143 ParameterizedType paramType = (ParameterizedType) result;
144 assertEquals(Calculator.class, paramType.getRawType());
145 assertEquals(1, paramType.getActualTypeArguments().length);
146 assertTrue(paramType.getActualTypeArguments()[0] instanceof WildcardType);
147 }
148
149 @Test
150 void testReturn_Lv1Class() throws Exception {
151 Class<?> clazz = Level1Mapper.class;
152 Method method = clazz.getMethod("select", Object.class);
153 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
154 assertEquals(String.class, result);
155 }
156
157 @Test
158 void testReturn_Lv2CustomClass() throws Exception {
159 Class<?> clazz = Level2Mapper.class;
160 Method method = clazz.getMethod("selectCalculator", Calculator.class);
161 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
162 assertTrue(result instanceof ParameterizedType);
163 ParameterizedType paramType = (ParameterizedType) result;
164 assertEquals(Calculator.class, paramType.getRawType());
165 assertEquals(1, paramType.getActualTypeArguments().length);
166 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
167 }
168
169 @Test
170 void testReturn_Lv2CustomClassList() throws Exception {
171 Class<?> clazz = Level2Mapper.class;
172 Method method = clazz.getMethod("selectCalculatorList");
173 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
174 assertTrue(result instanceof ParameterizedType);
175 ParameterizedType paramTypeOuter = (ParameterizedType) result;
176 assertEquals(List.class, paramTypeOuter.getRawType());
177 assertEquals(1, paramTypeOuter.getActualTypeArguments().length);
178 ParameterizedType paramTypeInner = (ParameterizedType) paramTypeOuter.getActualTypeArguments()[0];
179 assertEquals(Calculator.class, paramTypeInner.getRawType());
180 assertEquals(Date.class, paramTypeInner.getActualTypeArguments()[0]);
181 }
182
183 @Test
184 void testReturn_Lv0InnerClass() throws Exception {
185 Class<?> clazz = Level0InnerMapper.class;
186 Method method = clazz.getMethod("select", Object.class);
187 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
188 assertEquals(Float.class, result);
189 }
190
191 @Test
192 void testReturn_Lv2Class() throws Exception {
193 Class<?> clazz = Level2Mapper.class;
194 Method method = clazz.getMethod("select", Object.class);
195 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
196 assertEquals(String.class, result);
197 }
198
199 @Test
200 void testReturn_Lv1List() throws Exception {
201 Class<?> clazz = Level1Mapper.class;
202 Method method = clazz.getMethod("selectList", Object.class, Object.class);
203 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
204 assertTrue(result instanceof ParameterizedType);
205 ParameterizedType type = (ParameterizedType) result;
206 assertEquals(List.class, type.getRawType());
207 assertEquals(1, type.getActualTypeArguments().length);
208 assertEquals(String.class, type.getActualTypeArguments()[0]);
209 }
210
211 @Test
212 void testReturn_Lv1Array() throws Exception {
213 Class<?> clazz = Level1Mapper.class;
214 Method method = clazz.getMethod("selectArray", List[].class);
215 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
216 assertTrue(result instanceof Class);
217 Class<?> resultClass = (Class<?>) result;
218 assertTrue(resultClass.isArray());
219 assertEquals(String.class, resultClass.getComponentType());
220 }
221
222 @Test
223 void testReturn_Lv2ArrayOfArray() throws Exception {
224 Class<?> clazz = Level2Mapper.class;
225 Method method = clazz.getMethod("selectArrayOfArray");
226 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
227 assertTrue(result instanceof Class);
228 Class<?> resultClass = (Class<?>) result;
229 assertTrue(result instanceof Class);
230 assertTrue(resultClass.isArray());
231 assertTrue(resultClass.getComponentType().isArray());
232 assertEquals(String.class, resultClass.getComponentType().getComponentType());
233 }
234
235 @Test
236 void testReturn_Lv2ArrayOfList() throws Exception {
237 Class<?> clazz = Level2Mapper.class;
238 Method method = clazz.getMethod("selectArrayOfList");
239 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
240 assertTrue(result instanceof GenericArrayType);
241 GenericArrayType genericArrayType = (GenericArrayType) result;
242 assertTrue(genericArrayType.getGenericComponentType() instanceof ParameterizedType);
243 ParameterizedType paramType = (ParameterizedType) genericArrayType.getGenericComponentType();
244 assertEquals(List.class, paramType.getRawType());
245 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
246 }
247
248 @Test
249 void testReturn_Lv2WildcardList() throws Exception {
250 Class<?> clazz = Level2Mapper.class;
251 Method method = clazz.getMethod("selectWildcardList");
252 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
253 assertTrue(result instanceof ParameterizedType);
254 ParameterizedType type = (ParameterizedType) result;
255 assertEquals(List.class, type.getRawType());
256 assertEquals(1, type.getActualTypeArguments().length);
257 assertTrue(type.getActualTypeArguments()[0] instanceof WildcardType);
258 WildcardType wildcard = (WildcardType) type.getActualTypeArguments()[0];
259 assertEquals(0, wildcard.getLowerBounds().length);
260 assertEquals(1, wildcard.getUpperBounds().length);
261 assertEquals(String.class, wildcard.getUpperBounds()[0]);
262 }
263
264 @Test
265 void testReturn_LV2Map() throws Exception {
266 Class<?> clazz = Level2Mapper.class;
267 Method method = clazz.getMethod("selectMap");
268 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
269 assertTrue(result instanceof ParameterizedType);
270 ParameterizedType paramType = (ParameterizedType) result;
271 assertEquals(Map.class, paramType.getRawType());
272 assertEquals(2, paramType.getActualTypeArguments().length);
273 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
274 assertEquals(Integer.class, paramType.getActualTypeArguments()[1]);
275 }
276
277 @Test
278 void testReturn_Subclass() throws Exception {
279 Class<?> clazz = SubCalculator.class;
280 Method method = clazz.getMethod("getId");
281 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
282 assertEquals(String.class, result);
283 }
284
285 @Test
286 void testParam_Primitive() throws Exception {
287 Class<?> clazz = Level2Mapper.class;
288 Method method = clazz.getMethod("simpleSelectPrimitive", int.class);
289 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
290 assertEquals(1, result.length);
291 assertEquals(int.class, result[0]);
292 }
293
294 @Test
295 void testParam_Simple() throws Exception {
296 Class<?> clazz = Level1Mapper.class;
297 Method method = clazz.getMethod("simpleSelectVoid", Integer.class);
298 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
299 assertEquals(1, result.length);
300 assertEquals(Integer.class, result[0]);
301 }
302
303 @Test
304 void testParam_Lv1Single() throws Exception {
305 Class<?> clazz = Level1Mapper.class;
306 Method method = clazz.getMethod("select", Object.class);
307 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
308 assertEquals(1, result.length);
309 assertEquals(String.class, result[0]);
310 }
311
312 @Test
313 void testParam_Lv2Single() throws Exception {
314 Class<?> clazz = Level2Mapper.class;
315 Method method = clazz.getMethod("select", Object.class);
316 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
317 assertEquals(1, result.length);
318 assertEquals(String.class, result[0]);
319 }
320
321 @Test
322 void testParam_Lv2Multiple() throws Exception {
323 Class<?> clazz = Level2Mapper.class;
324 Method method = clazz.getMethod("selectList", Object.class, Object.class);
325 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
326 assertEquals(2, result.length);
327 assertEquals(Integer.class, result[0]);
328 assertEquals(String.class, result[1]);
329 }
330
331 @Test
332 void testParam_Lv2CustomClass() throws Exception {
333 Class<?> clazz = Level2Mapper.class;
334 Method method = clazz.getMethod("selectCalculator", Calculator.class);
335 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
336 assertEquals(1, result.length);
337 assertTrue(result[0] instanceof ParameterizedType);
338 ParameterizedType paramType = (ParameterizedType) result[0];
339 assertEquals(Calculator.class, paramType.getRawType());
340 assertEquals(1, paramType.getActualTypeArguments().length);
341 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
342 }
343
344 @Test
345 void testParam_Lv1Array() throws Exception {
346 Class<?> clazz = Level1Mapper.class;
347 Method method = clazz.getMethod("selectArray", List[].class);
348 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
349 assertTrue(result[0] instanceof GenericArrayType);
350 GenericArrayType genericArrayType = (GenericArrayType) result[0];
351 assertTrue(genericArrayType.getGenericComponentType() instanceof ParameterizedType);
352 ParameterizedType paramType = (ParameterizedType) genericArrayType.getGenericComponentType();
353 assertEquals(List.class, paramType.getRawType());
354 assertEquals(String.class, paramType.getActualTypeArguments()[0]);
355 }
356
357 @Test
358 void testParam_Subclass() throws Exception {
359 Class<?> clazz = SubCalculator.class;
360 Method method = clazz.getMethod("setId", Object.class);
361 Type[] result = TypeParameterResolver.resolveParamTypes(method, clazz);
362 assertEquals(String.class, result[0]);
363 }
364
365 @Test
366 void testReturn_Anonymous() throws Exception {
367 Calculator<?> instance = new Calculator<Integer>();
368 Class<?> clazz = instance.getClass();
369 Method method = clazz.getMethod("getId");
370 Type result = TypeParameterResolver.resolveReturnType(method, clazz);
371 assertEquals(Object.class, result);
372 }
373
374 @Test
375 void testField_GenericField() throws Exception {
376 Class<?> clazz = SubCalculator.class;
377 Class<?> declaredClass = Calculator.class;
378 Field field = declaredClass.getDeclaredField("fld");
379 Type result = TypeParameterResolver.resolveFieldType(field, clazz);
380 assertEquals(String.class, result);
381 }
382
383 @Test
384 void testReturnParam_WildcardWithUpperBounds() throws Exception {
385 class Key {
386 }
387 @SuppressWarnings("unused")
388 class KeyBean<S extends Key & Cloneable, T extends Key> {
389 private S key1;
390 private T key2;
391
392 public S getKey1() {
393 return key1;
394 }
395
396 public void setKey1(S key1) {
397 this.key1 = key1;
398 }
399
400 public T getKey2() {
401 return key2;
402 }
403
404 public void setKey2(T key2) {
405 this.key2 = key2;
406 }
407 }
408 Class<?> clazz = KeyBean.class;
409 Method getter1 = clazz.getMethod("getKey1");
410 assertEquals(Key.class, TypeParameterResolver.resolveReturnType(getter1, clazz));
411 Method setter1 = clazz.getMethod("setKey1", Key.class);
412 assertEquals(Key.class, TypeParameterResolver.resolveParamTypes(setter1, clazz)[0]);
413 Method getter2 = clazz.getMethod("getKey2");
414 assertEquals(Key.class, TypeParameterResolver.resolveReturnType(getter2, clazz));
415 Method setter2 = clazz.getMethod("setKey2", Key.class);
416 assertEquals(Key.class, TypeParameterResolver.resolveParamTypes(setter2, clazz)[0]);
417 }
418
419 @Test
420 void testDeepHierarchy() throws Exception {
421 @SuppressWarnings("unused")
422 abstract class A<S> {
423 protected S id;
424
425 public S getId() {
426 return this.id;
427 }
428
429 public void setId(S id) {
430 this.id = id;
431 }
432 }
433 abstract class B<T> extends A<T> {
434 }
435 abstract class C<U> extends B<U> {
436 }
437 class D extends C<Integer> {
438 }
439 Class<?> clazz = D.class;
440 Method method = clazz.getMethod("getId");
441 assertEquals(Integer.class, TypeParameterResolver.resolveReturnType(method, clazz));
442 Field field = A.class.getDeclaredField("id");
443 assertEquals(Integer.class, TypeParameterResolver.resolveFieldType(field, clazz));
444 }
445
446 @Test
447 void shouldTypeVariablesBeComparedWithEquals() throws Exception {
448
449 ExecutorService executor = Executors.newFixedThreadPool(2);
450 Future<Type> futureA = executor.submit(() -> {
451 Type retType = TypeParameterResolver.resolveReturnType(IfaceA.class.getMethods()[0], IfaceA.class);
452 return ((ParameterizedType) retType).getActualTypeArguments()[0];
453 });
454 Future<Type> futureB = executor.submit(() -> {
455 Type retType = TypeParameterResolver.resolveReturnType(IfaceB.class.getMethods()[0], IfaceB.class);
456 return ((ParameterizedType) retType).getActualTypeArguments()[0];
457 });
458 assertEquals(AA.class, futureA.get());
459 assertEquals(BB.class, futureB.get());
460 executor.shutdown();
461 }
462
463
464 class AA {}
465 class BB {}
466 interface IfaceA extends ParentIface<AA> {}
467 interface IfaceB extends ParentIface<BB> {}
468 interface ParentIface<T> {List<T> m();}
469
470 }