我有以下方法:
public static Category getImpl(Class<Category> category) throws IllegalAccessException, InstantiationException
{
Reflections reflections = new Reflections("com.dpd.modules");
Set<Class<? extends Category>> classes = reflections.getSubTypesOf(category);
Category queryGetter = null;
if (DDLTool.isOracle())
{
for (Class s : classes)
{
if (Oracle.class.isAssignableFrom(s))
{
queryGetter = s.newInstance();
}
}
}
else if (DDLTool.isMSSQL())
{
for (Class s : classes)
{
if (MsSql.class.isAssignableFrom(s))
{
queryGetter = s.newInstance();
}
}
}
else if (DDLTool.isPostgres())
{
for (Class s : classes)
{
if (PosgtreSql.class.isAssignableFrom(s))
{
queryGetter = s.newInstance();
}
}
}
return queryGetter;
}
但是,我无法真正将queryGetter强制转换为所需的类别
继承树如下:
Category (Interface) -> PortalCorp extends Category (Interface) | Portal365 extends Category (Interface)
Oracle | MsSql | PosgtreSql (all Interfaces)
然后是具体的类(仅适用于PortalCorp,适用于Portal365):
MsSqlQueryGetterPortalCorp implements PortalCorp, MsSql
OracleQueryGetterPortalCorp implements PortalCorp, Oracle
PostgresQueryGetterPortalCorp implements PortalCorp, PosgtreSql
但是我在行上看到“不兼容类型”错误:
queryGetter = s.newInstance();
如果执行,我该如何实现所需的行为
getImpl(PortalCorp.class);
和DDLTool.isOracle()
返回true
我最终将获得com.dpd.modules.OracleQueryGetterPortalCorp
的实例吗?
预先感谢
答案 0 :(得分:0)
循环变量未使用泛型。如果您尝试怎么办:
for (Class<? extends Category> s : classes)
如果编译器也不喜欢,在分配新实例之前如何进行铸造:
queryGetter = (Category) s.newInstance();