Welcome to Software Development on Codidact!
Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.
Comments on Convert Shaded Java class to its original
Parent
Convert Shaded Java class to its original
How do I cast or convert a shadow/shaded class (a package relocated class which is generally generated via tools like gradle/maven) to its original class in Java?
The assumption is that both the shaded version and the original version are simultaneously available on the classpath
Post
Casting the shaded class to its original is not possible, even though they are exactly similar. One will hit classCastExceptions while doing so
The simplest and easiest way is to serialize the shaded class is, using a serializer that doesn't encode the original class information in the serialized version and the deserialize it back. The default Java serializer cannot be used for this. However, gson is a good option.
import shade.prefix.com.company.Employee;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public class ShadedEmployeeToVanillaEmployeeConverter {
private static final Gson gson = createGson();
private static final String packagePrefix = "shade.prefix.";
public <U extends com.company.Employee> U convert(Employee shadedType) {
String json = gson.toJson(shadedType);
try {
Class<?> clazz = Class.forName(shadedType.getClass().getTypeName().replaceAll(packagePrefix, ""));
Object o = gson.fromJson(json, clazz);
return (U) o;
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
private static Gson createGson() {
GsonBuilder builder = new GsonBuilder();
return builder.create();
}
}
Limitations: (Pointed out by @derek elkins)
This approach will only work for "value" objects, and even then it will have caveats, e.g. loss of numerical precision and the inability to handle objects with cyclic reference graphs. For example, this clearly won't work for a "service" object that holds, say, an open network connection.
1 comment thread