Message alert notifications generation code.

MessageAlerts.java

package com.twilio.demo;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;

import com.twilio.sdk.TwilioRestClient;
import com.twilio.sdk.TwilioRestException;
import com.twilio.sdk.resource.instance.Account;
import com.twilio.sdk.resource.instance.IncomingPhoneNumber;
import com.twilio.sdk.resource.instance.Message;
import com.twilio.sdk.resource.list.IncomingPhoneNumberList;
import com.twilio.sdk.resource.factory.MessageFactory;
 
public class MessageAlerts {
 
	/* Find your sid and token at twilio.com/user/account */
	public static final String ACCOUNT_SID = System.getenv("ACCOUNT_SID"); 
	public static final String AUTH_TOKEN = System.getenv("AUTH_TOKEN"); 
 
	// callerIdList: Obtained from the REST API 
	public static List<IncomingPhoneNumber> callerIdList;
	// toPhoneNumberList: Alert Recipient phone number resource
	public static List<String> toPhoneNumberList = Arrays.asList(new String[] {""});
	// Message Body
	public static String messageBody = "Your appointment reminder";
	
	public static void main(String[] args) throws TwilioRestException {
 
		TwilioRestClient client = new TwilioRestClient(ACCOUNT_SID, AUTH_TOKEN);
        	Account account = client.getAccount();
        
        	// List of CallerId's for this account 
		callerIdList = getCallerIds(client);
				
		// Iterate through the Alert Recipient phone numbers
		Iterator<String> toPhoneNumberItr = toPhoneNumberList.iterator();
		while (toPhoneNumberItr.hasNext()) {
			
			// Randomly selected phone number from callerIdList
			String fromNumber = getFromNumber();
			// Alert Recipient phone number
			String toNumber = toPhoneNumberItr.next();
			// Send out alert message
			sendMessage(fromNumber, toNumber, account);
		}
	}
	
	/**
	 * Creates and sends an outgoing message
	 * 
	 * @param fromNumber
	 * @param toNumber
	 * @param account
	 */
	
	public static void sendMessage(String fromNumber, String toNumber, Account account) {
		
        MessageFactory messageFactory =  (MessageFactory) account.getMessageFactory();
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("To", toNumber)); 
        params.add(new BasicNameValuePair("From", fromNumber)); 
        params.add(new BasicNameValuePair("Body", messageBody));
        
		try {
			Message sms = messageFactory.create(params);	
			System.out.println(sms.getSid());
		} catch (TwilioRestException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * Iterates over the IncomingPhoneNumberList
	 * Returns a List of IncomingPhoneNumber objects
	 * 
	 * @param client
	 * @return List<IncomingPhoneNumber>
	 */
	
	public static List<IncomingPhoneNumber> getCallerIds(TwilioRestClient client) {
		
		IncomingPhoneNumberList callerIds = client.getAccount().getIncomingPhoneNumbers(); 
		List<IncomingPhoneNumber> callerIdList = new ArrayList<IncomingPhoneNumber>();

		Iterator<IncomingPhoneNumber> callerIdItr = callerIds.iterator();
		while(callerIdItr.hasNext()) {
			callerIdList.add(callerIdItr.next());
		}
		return callerIdList;
	}
	
	/**
	 * Randomly returns a phone number
	 * from the phone number list
	 * 
	 * @return phone number
	 */
	
	public static String getFromNumber() {

		Random randomGenarator = new Random();
		return callerIdList.get(randomGenarator.nextInt(callerIdList.size())).getPhoneNumber();
	}
}