本文介绍了Guice注入泛型类型的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图用Guice注入泛型。我有知识库< T>,它位于Cursor类中。 public class Cursor< T> {
@Inject
受保护的信息库< T>库;
所以当我创建Cursor<用户>,我也希望Guice将我的资源库注入到Repository<用户>。有没有办法做到这一点?
解决方案
您必须使用: p>
import com.google.inject.AbstractModule;
import com.google.inject.TypeLiteral;
public class MyModule extends AbstractModule {
@Override
protected void configure(){
bind(new TypeLiteral< Repository< User>>( ){})。(UserRepository.class);
$ / code>
要得到一个的实例, Cursor< T>
,一个注射器
是必需的:
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
public class Main {
public static void main(String [] args){
Inject injector = Guice.createInjector(new MyModule());
光标<用户> instance =
injector.getInstance(Key.get(new TypeLiteral< Cursor< User>>(){}));
System.err.println(instance.repository);
更多详情。
I'am trying to Inject generic type with Guice. I have Repository< T > which is located in the Cursor class.
public class Cursor<T> {
@Inject
protected Repository<T> repository;
So when I create Cursor< User >, I also want the Guice to inject my repository to Repository< User >. Is there a way to do this?
解决方案
You have to use a TypeLiteral
:
import com.google.inject.AbstractModule;
import com.google.inject.TypeLiteral;
public class MyModule extends AbstractModule {
@Override
protected void configure() {
bind(new TypeLiteral<Repository<User>>() {}).to(UserRepository.class);
}
}
To get an instance of Cursor<T>
, an Injector
is required:
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
public class Main {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new MyModule());
Cursor<User> instance =
injector.getInstance(Key.get(new TypeLiteral<Cursor<User>>() {}));
System.err.println(instance.repository);
}
}
More details in the FAQ.
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