/**
 *
 */
package de.intevation.gnv.propertiesreader;

import java.util.Map;

import javax.servlet.ServletConfig;

import org.apache.log4j.Logger;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 *
 */
public class PropertiesReaderFactory {


    
    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(PropertiesReaderFactory.class);

    
    /**
     * The singleton Instance of this Factory.
     */
    private static PropertiesReaderFactory instance = null;

    /**
     * The ConnectionPool providing the Connections to the DatabaseBackends
     */
    private PropertiesReader propertiesReader = null;
    /**
     * Constructor
     */
    private PropertiesReaderFactory() {
        super();
    }

    /**
     * This Method provides an singleton Instance of this Class.
     * @return an singleton Instance of this Class
     */
    public static PropertiesReaderFactory getInstance(){
        if (instance == null){
            instance = new PropertiesReaderFactory();
        }
        return instance;
    }
    
    
    /**
     * Getting the ConnectionPool
     * @return the ConnectionPool
     */
    public PropertiesReader getPropertiesReader(){
        return this.propertiesReader;
    }
    
    /**
     * Getting the ConnectionPool
     * @param config The Config that should be read
     */
    public void initPropertiesReader(Object config){
        if (config instanceof ServletConfig){
            this.propertiesReader = new ServletPropertiesReader((ServletConfig)config);
        }else if (config instanceof Map){
            this.propertiesReader = new MapPropertiesReader((Map<String, String>)config);
        }else{
            log.error("No PropertiesReader for Instance "+ config.getClass().getName());
        }
        
    }

}