Using google inject - Java Library

Java examples for Library:Guice

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Description

Using google inject

Demo Code

package com.athena.binding.annotation;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import com.google.inject.AbstractModule;
import com.google.inject.BindingAnnotation;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;

public class Main {
    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new BillingModule());
        BillingService billingService = injector
                .getInstance(BillingService.class);
        billingService.doIt();//w w  w  . j ava2s .c  o  m
    }

    private static interface CreditCardProcessor {
        void doIt();
    }

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

    private static class BillingService {

        private final CreditCardProcessor processor;

        @Inject
        public BillingService(@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");
        }
    }

    @BindingAnnotation
    @Target({ FIELD, PARAMETER, METHOD })
    @Retention(RUNTIME)
    public @interface Paypal {
    }
}

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