SimpleNotification.java

package com.amazon.aws.demo.sns;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.amazon.aws.demo.AWSDemo;
import com.amazonaws.services.sns.*;
import com.amazonaws.services.sns.model.CreateTopicRequest;
import com.amazonaws.services.sns.model.CreateTopicResult;
import com.amazonaws.services.sns.model.DeleteTopicRequest;
import com.amazonaws.services.sns.model.ListSubscriptionsByTopicRequest;
import com.amazonaws.services.sns.model.ListTopicsRequest;
import com.amazonaws.services.sns.model.PublishRequest;
import com.amazonaws.services.sns.model.PublishResult;
import com.amazonaws.services.sns.model.SubscribeRequest;
import com.amazonaws.services.sns.model.SubscribeResult;
import com.amazonaws.services.sns.model.Subscription;
import com.amazonaws.services.sns.model.Topic;

public class SimpleNotification {

	private static AmazonSNSClient sns = null;
	public static final String TOPIC_ARN = "_Topic_Arn";

	
	public static AmazonSNSClient getInstance(){
		if(sns == null){
			sns = new AmazonSNSClient( AWSDemo.credentials );
		}
		return sns;
	}
	
	public static List<String> getTopicNames(){
		List topics = getInstance().listTopics().getTopics();
		Iterator tIter = topics.iterator();
		List<String> topicNames = new ArrayList<String>( topics.size() );
		while(tIter.hasNext()){
			topicNames.add(((Topic) tIter.next()).getTopicArn());
		}
		return topicNames;
	}
	
	public static List<String> getSubscriptionNamesByTopic(String topicARN){
		List subscriptions;
		if(topicARN != null) {
			ListSubscriptionsByTopicRequest req = new ListSubscriptionsByTopicRequest(topicARN);
			subscriptions = getInstance().listSubscriptionsByTopic(req).getSubscriptions();
		} else {
			subscriptions = getInstance().listSubscriptions().getSubscriptions();
		}
		Iterator sIter = subscriptions.iterator();
		List<String> subscriptionNames = new ArrayList<String>(subscriptions.size());
		while(sIter.hasNext()){
			subscriptionNames.add( ((Subscription) sIter.next()).getEndpoint());
		}
		return subscriptionNames;
	}
	
	public static List<String> getSubscriptionNames(){
		return getSubscriptionNamesByTopic(null);
	}
	
	public static CreateTopicResult createTopic(String name){
		CreateTopicRequest req = new CreateTopicRequest(name);
		return getInstance().createTopic(req);
	}
	
	public static void deleteTopic(String name){
		DeleteTopicRequest req = new DeleteTopicRequest(name);
		getInstance().deleteTopic(req);	
	}
	
	public static PublishResult publish(String topicARN, String msg){
		PublishRequest req = new PublishRequest(topicARN, msg);
		return getInstance().publish(req);
	}
	
	public static SubscribeResult subscribe(String topicArn, String protocol, String endpoint) {
			SubscribeRequest req= new SubscribeRequest(topicArn, protocol, endpoint);
			return getInstance().subscribe(req);
	}
	
	public static String getArnFromTopic(String topicName){
		List<String> listOfTopicARN = getTopicNames();
		Iterator<String> aIter = listOfTopicARN.iterator();
		while(aIter.hasNext()) {
			String temp = aIter.next();
			if(temp.endsWith(topicName))
				return temp;
		}
		return null;
	}
		
}