Get instance from google Injector - Java Library

Java examples for Library:Guice

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Description

Get instance from google Injector

Demo Code

package com.athena.binding.named_annotation;

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.name.Named;
import com.google.inject.name.Names;

public class Main {
    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new BillingModule());
        BillingService billingService = injector
                .getInstance(BillingService.class);
        billingService.doIt();/*w  ww  .j  a va2 s.  co m*/
    }

    private static interface CreditCardProcessor {
        void doIt();
    }

    private static class BillingModule extends AbstractModule {
        @Override
        protected void configure() {
            bind(CreditCardProcessor.class).annotatedWith(
                    Names.named("paypal")).to(
                    PaypalCreditCardProcessor.class);
        }
    }

    private static class BillingService {

        private final CreditCardProcessor processor;

        @Inject
        public BillingService(@Named("paypal") CreditCardProcessor processor) {
            this.processor = processor;
        }

        public void doIt() {
            processor.doIt();
        }
    }

    private static class PaypalCreditCardProcessor implements
            CreditCardProcessor {
        public void doIt() {
            System.out.println("Paypal");
        }
    }

    private static class GoogleCheckoutCreditCardProcessor implements
            CreditCardProcessor {
        public void doIt() {
            System.out.println("GoogleCheckout");
        }
    }
}

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