scheduler4e-javalibs/lib-db/src/main/java/com/fourelementscapital/db/Config.java

/******************************************************************************
*
* Copyright: Intellectual Property of Four Elements Capital Pte Ltd, Singapore.
* All rights reserved.
*
******************************************************************************/

package com.fourelementscapital.db;

import java.io.File;
import java.io.FileInputStream;
import java.util.MissingResourceException;
import java.util.Properties;
import java.util.ResourceBundle;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;


/**
 * This class populates the configuration value from property file 
 */
class Config {
	
	/**
	 * Configuration file
	 */
	private static final String BUNDLE_NAME = "config_db"; //$NON-NLS-1$	
	
	/**
	 * windows peer configuration 
	 */
	private static final String PROPERTY_FILE_WIN = "peer_db_windows.properties"; //$NON-NLS-1$
	
	/**
	 * unix peer/server configuration file
	 */
	private static final String PROPERTY_FILE_UNIX = "peer_db_unix.properties"; //$NON-NLS-1$	
	
	public static String CONFIG_PROPERTY_LOCATION=null;
	
	private static Properties confpro=null;
	
	/**
	 * Private constructor
	 */	
	private Config() {
	}

	
	/**
	 * Get property value of specified key. Return '!key!' if not found.
	 * @param key key
	 * @return property value
	 */
	protected static String getString(String key) {
		if(CONFIG_PROPERTY_LOCATION==null){
			try {
				//return RESOURCE_BUNDLE.getString(key);
				return getResourceBuddle().getString(key);
			} catch (MissingResourceException e) {
				return '!' + key + '!';
			}
		}else{
			try {
				String ky= getPeerProperty(key);				
				if(ky==null) throw new Exception();
				else return ky;
			} catch (Exception e) {
				return '!' + key + '!';
			}
		}
	}

	
	private static ResourceBundle resourceBundle=null;
	
	
	/**
	 * Get resources bundle
	 * @return resources bundle
	 */	
	private synchronized static  ResourceBundle getResourceBuddle(){
		
		if(resourceBundle==null){
			resourceBundle=ResourceBundle.getBundle(BUNDLE_NAME);
			LogManager.getLogger(Config.class.getName()).info("resourceBundle:"+resourceBundle);
		} 
		
		return resourceBundle;		 
	}
	
	
	/**
	 * Get property value of specified key. Return null if not found.
	 * @param key key
	 * @return property value
	 */
	protected static String getValue(String key) {
		if(CONFIG_PROPERTY_LOCATION==null){
			try {
				 
				return getResourceBuddle().getString(key);
			} catch (MissingResourceException e) {
				return null;
			}
		}else{
			try {
				return getPeerProperty(key);
			} catch (Exception e) {
				return null;
			}
		}
	}	
	

	/**
	 * Get peer property by key
	 * @param key key
	 * @return peer property
	 */	
	private static String getPeerProperty(String key) throws Exception {
		try{
			if(confpro==null){
				String propertyfilename=PROPERTY_FILE_WIN;
				if(System.getProperty("os.name").toLowerCase().equals("freebsd"))
					propertyfilename=PROPERTY_FILE_UNIX;
				
				if(System.getProperty("os.name").toLowerCase().contains("linux"))
					propertyfilename=PROPERTY_FILE_UNIX;				
				
				String folder=CONFIG_PROPERTY_LOCATION;
				folder=folder.endsWith(File.separator)?folder:folder+File.separator;
				confpro=new Properties();
				String filename=folder+"conf"+File.separator+propertyfilename;
				confpro.load(new FileInputStream(filename));
			}	
			return confpro.getProperty(key);
		}catch(Exception e){
			e.printStackTrace();
			throw e;
		}
	}	

}