package common;

import java.io.*;
import java.net.*;
import java.util.*;

public class Common {
	
	@SuppressWarnings("rawtypes")
	public static String getClassLocation(Class cls) {
		URL url = cls.getProtectionDomain().getCodeSource().getLocation();
		String filePath = null;
		try {
			filePath = URLDecoder.decode(url.getPath(), "UTF-8");
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		if (filePath.endsWith(".jar")) {
			filePath = filePath.substring(0, filePath.lastIndexOf("/") + 1);
		}
		return new File(filePath).getAbsolutePath();
	}
	
	@SuppressWarnings("rawtypes")
	public static String getWorkDir(Class cls) {
		String bin = "bin";
		String workDir = getClassLocation(cls);
		if (workDir.endsWith(bin)) {
			workDir = workDir.substring(0, workDir.length() - bin.length());
			workDir = new File(workDir).getAbsolutePath();
		}
		return workDir;
	}
	
	public static String getLineSeparator() {
		return System.getProperty("line.separator");
	}
	
	public static String getCurDir() {
		return System.getProperty("user.dir");
	}
	
	public static Properties loadProperties(String filename) {
		Properties properties = new OrderedProperties();
		try {
			FileInputStream input = new FileInputStream(filename);
			properties.load(input);
			input.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return properties;
	}
	
	public static void saveProperties(Properties properties, String filename, String comments) throws IOException {	
		try {
			File file = new File(filename);
			file.createNewFile();
			FileOutputStream output = new FileOutputStream(file);
			properties.store(output, comments);
			output.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		System.out.println(getWorkDir(Common.class));
	}
}