ke.co.tawi.babblesms.server.servlet.util.PropertiesConfig.java Source code

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Here is the source code for ke.co.tawi.babblesms.server.servlet.util.PropertiesConfig.java

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/**
 * Copyright 2015 Tawi Commercial Services Ltd
 * 
 * Licensed under the Open Software License, Version 3.0 (the License?); you may
 * not use this file except in compliance with the License. You may obtain a copy
 * of the License at:
 * http://opensource.org/licenses/OSL-3.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an AS IS? BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied.
 * 
 * See the License for the specific language governing permissions and limitations
 * under the License.
 */
package ke.co.tawi.babblesms.server.servlet.util;

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.lang3.exception.ExceptionUtils;

import org.apache.log4j.Logger;

/**
 * Used to read in the values within the configuration file.
 * <p>
 *  
 * @author <a href="mailto:michael@tawi.mobi">Michael Wakahe</a>
 */
public class PropertiesConfig extends HttpServlet {

    private final Logger logger = Logger.getLogger(this.getClass());

    private static String configFile = "";

    // Values in config file to be retained in a HashMap
    private static final HashMap<String, String> configHash = new HashMap<>();

    /**
     * @param config
     * @throws ServletException
     * @see javax.servlet.Servlet#init(ServletConfig)
     */
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);

        configFile = getServletContext().getRealPath("/") + getInitParameter("config-file");
        initConfigHash();

    }

    /**
       * @param request 
       * @param response 
       * @throws ServletException 
       * @throws IOException 
       * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.sendRedirect("index.jsp");
    }

    /**  
     * @param configAttribute
     * @return       the String value of the attribute we seek
     */
    public static String getConfigValue(String configAttribute) {
        return configHash.get(configAttribute);
    }

    /**
     * Populate the internal HashMap which will hold configuration keys and values
     */
    private void initConfigHash() {
        PropertiesConfiguration config;
        String key;

        try {
            config = new PropertiesConfiguration();
            config.setListDelimiter('|'); // our array delimiter
            config.setFileName(configFile);
            config.load();

            Iterator<String> keys = config.getKeys();

            while (keys.hasNext()) {
                key = keys.next();
                configHash.put(key, (String) config.getProperty(key));
            }

        } catch (ConfigurationException e) {
            logger.error("ConfigurationException when trying to initialize configuration HashMap");
            logger.error(ExceptionUtils.getStackTrace(e));
        }
    }
}