source: java/AEInstaller2-Updater/src/net/oni2/aeinstaller/updater/backend/Paths.java

package net.oni2.aeinstaller.updater.backend;

import java.io.File;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

/**
 * @author Christian Illy
 */
public class Paths {

        /**
         * Use the wd instead of the jar path
         */
        public static boolean useWorkingDirectory = false;

        /**
         * Get the Jar path
         * 
         * @return Path
         */
        public static File getInstallerPath() {
                String jarPath = Paths.class.getProtectionDomain().getCodeSource()
                                .getLocation().getPath();
                jarPath = jarPath.replaceAll("\\+", "%2B");
                String decodedPath = null;
                try {
                        decodedPath = URLDecoder.decode(jarPath, "UTF-8");
                } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                }
                return new File(decodedPath).getParentFile();
        }

        /**
         * @return Proxy settings filename of AEI
         */
        public static File getProxySettingsFilename() {
                return new File(getPrefsPath(), "AEI-ProxySettings.xml");
        }

        /**
         * Get the preferences path
         * 
         * @return Path
         */
        public static File getPrefsPath() {
                if (useWorkingDirectory) {
                        String wd = System.getProperty("user.dir");
                        return new File(wd);
                } else
                        return getInstallerPath();
        }

        /**
         * Get the path to store downloaded files
         * 
         * @return Download path
         */
        public static File getDownloadPath() {
                return new File(getTempPath(), "downloads");
        }

        /**
         * Get the systems temp-path
         * 
         * @return Path
         */
        public static File getTempPath() {
                return new File(System.getProperty("java.io.tmpdir"), "oni_aei");
        }

}