This is how I ended up solving the problem:
public CalculatorModule {
@BindingAnnotation @Target({ FIELD, PARAMETER, METHOD }) @Retention
(RUNTIME)
public @interface TypeA {}
@BindingAnnotation @Target({ FIELD, PARAMETER, METHOD }) @Retention
(RUNTIME)
public @interface TypeB {}
@BindingAnnotation @Target({ FIELD, PARAMETER, METHOD }) @Retention
(RUNTIME)
public @interface TypeC {}
@Override
protected void configure() {
bind(ICalculator.class).annotatedWith(TypeA.class).to
(ACalculator.class);
bind(ICalculator.class).annotatedWith(TypeB.class).to
(BCalculator.class);
bind(ICalculator.class).annotatedWith(TypeC.class).to
(CCalculator.class);
}
}
@Singleton
public class CalculatorFactory {
private final Provider<ICalculator> a;
private final Provider<ICalculator> b;
private final Provider<ICalculator> c;
@Inject
public CalculatorFactory(@CalculatorModule.TypeA
Provider<ICalculator> AProvider,
@CalculatorModule.TypeB
Provider<ICalculator> BProvider,
@CalculatorModule.TypeC
Provider<ICalculator> CProvider) {
a = AProvider;
b = BProvider;
c = CProvider;
}
public ICalculator create(UserGroup group) {
if (group.getType.equals(Types.A) {
return a.get();
} else if (group.getType.equals(Types.B) {
return b.get();
} else if (group.getType.equals(Types.C) {
return c.get();
}
}
}
and in my code.........at the top level
Guice.createInjector(new CalculatorModule());
and my class that uses the calculator factory looks like this....
public class MyClass {
private final CalculatorFactory calcFactory;
@Inject
public MyClass(CalculatorFactory factory) {
calcFactory = calcFactory;
}
public doSomething(User user) {
....
ICalculator calc = calcFactory.create(user.getGroup());
calc.doStuff();
}
}
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