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FieldWrapper 获取Collection泛型类型时增加友好错误提示。

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rainy 2024-07-18 11:46:59 +08:00
parent ef3a5fd71c
commit 6a3dafd160
1 changed files with 9 additions and 3 deletions
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6
mybatis-flex-core/src/main/java/com/mybatisflex/core/util/FieldWrapper.java
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@ -94,10 +94,16 @@ public class FieldWrapper {
if (Collection.class.isAssignableFrom(fieldType)) { if (Collection.class.isAssignableFrom(fieldType)) {
Type genericType = field.getGenericType(); Type genericType = field.getGenericType();
try{
//使用Kotlin时，若Collection泛型类型为协变类型时（如 List<out E>），并且传入的具体泛型类型为open，genericType的具体类型为WildcardType（? extends ExampleClass），该类型不可转为Class（无具体类型），使用instanceOf会抛出转换异常。
//该错误目前只在以上情况中发现
if (genericType instanceof ParameterizedType) { if (genericType instanceof ParameterizedType) {
Type actualTypeArgument = ((ParameterizedType) genericType).getActualTypeArguments()[0]; Type actualTypeArgument = ((ParameterizedType) genericType).getActualTypeArguments()[0];
fieldWrapper.mappingType = (Class<?>) actualTypeArgument; fieldWrapper.mappingType = (Class<?>) actualTypeArgument;
} }
}catch (ClassCastException e){
throw new UnsupportedOperationException(String.format("不支持使用[%s]作为集合类型。请使用MutableList",fieldType.getName()));
}
} else if (Map.class.isAssignableFrom(fieldType)) { } else if (Map.class.isAssignableFrom(fieldType)) {
Type genericType = field.getGenericType(); Type genericType = field.getGenericType();
if (genericType instanceof ParameterizedType) { if (genericType instanceof ParameterizedType) {