net.terryyiu.emailservice.providers.AbstractEmailServiceProvider.java Source code

Introduction

Here is the source code for net.terryyiu.emailservice.providers.AbstractEmailServiceProvider.java

Source

/*
 * EmailService - RESTful service that sends emails
 * Copyright (C) 2014  Terry Yiu
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.terryyiu.emailservice.providers;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

import net.terryyiu.emailservice.core.Email;

import com.fasterxml.jackson.databind.ObjectMapper;

public abstract class AbstractEmailServiceProvider implements EmailServiceProvider {

    @Override
    public boolean send(Email email) throws IOException {
        HttpURLConnection connection = createConnection();

        // Create a Map from an email object, which can be translated to JSON which
        // the specific email service provider understands.
        Map<String, Object> map = getRequestPostData(email);

        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(map);

        DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
        dos.writeBytes(json);
        dos.flush();
        dos.close();

        int responseCode = connection.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + getServiceUrl());
        System.out.println("JSON: " + json);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        connection.disconnect();
        return false;
    }

    private HttpURLConnection createConnection() throws IOException {
        URL url = new URL(getServiceUrl());
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/json");
        connection.setUseCaches(false);

        modifyConnection(connection);

        return connection;
    }

    protected void modifyConnection(HttpURLConnection connection) {
        // Subclasses can override this method to define custom connection configuration.
    }

    protected abstract Map<String, Object> getRequestPostData(Email email);

    protected abstract String getServiceUrl();

}