systemsettings.java

主要是航空预订系统

package com.air.util.settings;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.air.constants.AppConstants;

public final class SystemSettings
{
	private static Log log = LogFactory.getLog(SystemSettings.class);
	private Properties prop;
	/**
	 * private constructor of SystemSettings, prevent instantiation
	 */
	private SystemSettings()
	{
		InputStream in = SystemSettings.class.getClassLoader().getResourceAsStream(SystemSettingsConstants.CONFIGFILE);
		prop = new Properties();
		try
		{
			prop.load(in);
		}
		catch(IOException ioex)
		{
			log.error("init() -- caught IOException: ", ioex);
		}
	}
	private static class SystemSettingsHolder
	{
		static final SystemSettings sysSettings = new SystemSettings();
	}
	/**
	 * @return an instance of SystemSettings
	 */
	public static SystemSettings getInstance()
	{
		return SystemSettingsHolder.sysSettings;
	}
	/**
	 * Database Data Source settings.
	 */
	public String getDBDataSourceName()
	{
		return (prop.getProperty(SystemSettingsConstants.DRCNAME, AppConstants.EMPTY_STR)).trim();
	}
	public String getDBDataSourceClassName()
	{
		return (prop.getProperty(SystemSettingsConstants.DRCCLAZNAME, AppConstants.EMPTY_STR)).trim();
	}
	/**
	 * @return java.lang.String
	 */
	public String getDrcDriver()
	{
		return (prop.getProperty(SystemSettingsConstants.DRIVE, AppConstants.EMPTY_STR)).trim();
	}
	/**
	 * @return java.lang.String
	 */
	public String getDrcPWD()
	{
		return (prop.getProperty(SystemSettingsConstants.PWD, AppConstants.EMPTY_STR)).trim();
	}
	/**
	 * @return java.lang.String
	 */
	public String getDrcUID()
	{
		return (prop.getProperty(SystemSettingsConstants.UID, AppConstants.EMPTY_STR)).trim();
	}
	/**
	 * @return java.lang.String
	 */
	public String getDrcURL()
	{
		return (prop.getProperty(SystemSettingsConstants.URL, AppConstants.EMPTY_STR)).trim();
	}
	/**
	 * for unit testing purpose
	 * @param classname
	 */
	public void setDBDataSourceClassName( String classname )
	{
		prop.setProperty(SystemSettingsConstants.DRCCLAZNAME, classname);
	}

}