CfgSettings.java

/*******************************************************************************
 * Copyright (c) 2005-2011, G. Weirich and Elexis
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    G. Weirich - initial implementation
 *    
 *******************************************************************************/

package ch.rgw.io;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Iterator;

import ch.rgw.tools.ExHandler;
import ch.rgw.tools.StringTool;

/**
 * Settings-Implementation, die auf einem flat file basiert. Alle Schlüssel sind in der Form
 * <code>key=value</code> in je einer eigenen Zeile abgelegt. Hierarchische Schlüssel
 * (Branches/Zweige) sind einfach als <code>branch/key=value</code> abgespeichert-
 * 
 * @author Gerry Weirich
 */
public class CfgSettings extends Settings {
	/**
	 * 
	 */
	private static final long serialVersionUID = 0xaaa34e1L;
	
	public static final String Version(){
		return "1.0.2";
	}
	
	private transient String filename;
	private transient String message = "CfgSettings v" + Version();
	
	public CfgSettings(String n, String msg){
		filename = n;
		message = msg;
		undo();
	}
	
	/**
	 * �ffnet Settings oder legt sie neu an, w�hlt automatisch den user.home-Pfad und den
	 * vorgegebenen Dateinamen.
	 * 
	 * @param name
	 *            Filename f�r das settings-file
	 * @param msg
	 *            Einzeilige Nachricht, die als Kommentar in die erste Zeile kommt
	 */
	static public Settings open(String name, String msg){
		try {
			if (exists(name)) {
				return new CfgSettings(name, msg);
			}
			String h = System.getProperty("user.home", "");
			if (!h.equals("")) {
				h += java.io.File.separator;
			}
			if (exists(h + name)) {
				return new CfgSettings(h + name, msg);
			}
			if (exists(name + ".cfg")) {
				return new CfgSettings(name + ".cfg", msg);
			}
			if (exists(h + name + ".cfg")) {
				return new CfgSettings(h + name + ".cfg", msg);
			}
			if (name.matches(".*" + File.pathSeparator + ".*")) {
				return new CfgSettings(name, msg);
			}
			return new CfgSettings(h + name, msg);
		} catch (Exception ex) {
			ExHandler.handle(ex);
			return null;
		}
		
	}
	
	/**
	 * Fragt, ob ein Settings-file existiert (Pr�ft nicht auf Syntax)
	 * 
	 * @param name
	 *            Dateiname
	 * @return true wenn die Datei existiert
	 */
	
	static public boolean exists(String name){
		File fi = new File(name);
		return fi.exists();
	}
	
	/**
	 * @see ch.rgw.IO.Settings#flush()
	 */
	protected void flush_absolute(){
		if (filename == null) {
			return;
		}
		try {
			BufferedWriter fo = new BufferedWriter(new FileWriter(filename));
			fo.write("#" + message);
			ArrayList<String> all = getAll();
			Iterator<String> it = all.iterator();
			while (it.hasNext()) {
				String el = (String) it.next();
				String v = get(el, null);
				fo.write(el + "=" + v);
				fo.newLine();
			}
			fo.close();
		} catch (Exception e1) {
			ExHandler.handle(e1);
		}
	}
	
	/**
	 * @see ch.rgw.IO.Settings#undo()
	 */
	public void undo(){
		if (filename == null) {
			return;
		}
		clear();
		try {
			File fl = new File(filename);
			if (fl.exists() && fl.canRead()) {
				BufferedReader fi = new BufferedReader(new FileReader(fl));
				String line;
				while ((line = fi.readLine()) != null) {
					line = line.replaceAll("#.*", "").trim();
					if (StringTool.isNothing(line)) {
						continue;
					}
					String[] pair = line.split("=");
					if (pair.length != 2) {
						log.error("Format Error in config file " + filename);
						continue;
					}
					set(pair[0].trim(), pair[1].trim());
				}
				fi.close();
				cleaned();
			}
		} catch (Exception ex) {
			ExHandler.handle(ex);
		}
	}
	
	public void kill(){
		if (filename == null) {
			return;
		}
		File f = new File(filename);
		f.delete();
	}
}