Java : répertoire de l’application

/**
	 * {@link java.lang.System#getProperty(String)
	 * System.getProperty("user.dir")} does not return class directory each
	 * time. If we start a java application from a command prompt by giving the
	 * path (not using ‹code›cd‹/code› command to set the active directory),
	 * ‹code›user.dir‹/code› contains the active directory and not the
	 * application directory.
	 * 
	 * @param startingClass
	 *            class witch we need to know directory
	 * @param cached
	 *            ‹ul›
	 *            ‹li›‹code›true‹/code› to avoid doing the parsing each time.
	 *            The result is stored as cache after the first call.‹/li›
	 *            ‹li›‹code›false‹/code› to ignore cached result (this does not
	 *            affect the cached result).
	 * 
	 * @return path of the class arg
	 * 
	 * @since 0.1.12-SNAPSHOT (Feb 12 2009)
	 */
	public static String getApplicationPath(Class‹?› startingClass,
			boolean cached) {
 
		if (!cached || applicationPath == null) {
 
			String classDirectory = "/"
					+ startingClass.getName().replace(’.’, ’/’) + ".class";
			// classDirectory = /be/gaudry/model/file/FileHelper.class
			System.out.println("FileHelper.getApplicationPath() 1 "+classDirectory);
 
			URL url = FileHelper.class.getResource(classDirectory);
 
			try {
 
				classDirectory = URLDecoder.decode(url.toString(), "UTF-8");
				System.out.println("FileHelper.getApplicationPath() 2 "+classDirectory);
 
				// This class is run from a jar file
				if (classDirectory.startsWith("jar:file:")) {
					// classDirectory =
					// jar:file:/media/DATA/steph/dev/java/projets/dist/EducaBrol-Full-jar-with-dependencies.jar!/be/gaudry/model/file/FileHelper.class
					System.out.println("FileHelper.getApplicationPath() 4 "+classDirectory);
 
					// remove "jar:file:" string and classpath string from URL
					int index = classDirectory.indexOf("!");
					classDirectory = classDirectory.substring(9, index);
					// classDirectory =
					// /media/DATA/steph/dev/java/projets/dist/EducaBrol-Full-jar-with-dependencies.jar
					System.out.println("FileHelper.getApplicationPath() 5 "+classDirectory);
 
					// remove jar name from URL
					index = classDirectory.lastIndexOf("/");
					classDirectory = classDirectory.substring(0, index);
					// classDirectory = /media/DATA/steph/dev/java/projets/dist
					System.out.println("FileHelper.getApplicationPath() 6 "+classDirectory);
 
				} else {
					// This class is not in a jar file
 
					// classDirectory =
					// file:/media/DATA/steph/dev/java/projets/broldev/core/broldev.core.model/target/classes/be/gaudry/model/file/FileHelper.class
					System.out.println("FileHelper.getApplicationPath() 7 "+classDirectory);
 
					// remove file name and extension from URL
					int index = classDirectory.lastIndexOf("/");
					classDirectory = classDirectory.substring(0, index);
					// classDirectory =
					// file:/media/DATA/steph/dev/java/projets/broldev/core/broldev.core.model/target/classes/be/gaudry/model/file
					System.out.println("FileHelper.getApplicationPath() 8 "+classDirectory);
 
					// remove file: prefix from URL
					classDirectory = classDirectory.substring(5, classDirectory
							.length());
					// classDirectory =
					// /media/DATA/steph/dev/java/projets/broldev/core/broldev.core.model/target/classes/be/gaudry/model/file
					System.out.println("FileHelper.getApplicationPath() 9 "+classDirectory);
 
					Package pack = startingClass.getPackage();
					if (null != pack) {
						String packPath = pack.toString().replace(’.’, ’/’);
						// packPath = package be/gaudry/model/file
 
						// remove package from URL
						if (classDirectory.endsWith(packPath.substring(8))) {
							classDirectory = classDirectory.substring(0,
									(classDirectory.length() - packPath
											.length()));
							// classDirectory =
							// /media/DATA/steph/dev/java/projets/broldev/core/broldev.core.model/target/
							System.out.println("FileHelper.getApplicationPath() 10 "+classDirectory);
						}
 
						// remove maven structure from URL
						String maven = "target/";
						if (classDirectory.endsWith(maven)) {
							classDirectory = classDirectory.substring(0,
									(classDirectory.length() - maven.length()));
							// classDirectory =
							// /media/DATA/steph/dev/java/projets/broldev/core/broldev.core.model/
							System.out.println("FileHelper.getApplicationPath() 11 "+classDirectory);
						}
					}
				}
 
				// Windows path may not start with "/" before drive letter
				if (File.separator.equals("\\\\")) {
					classDirectory = classDirectory.substring(1);
					System.out.println("FileHelper.getApplicationPath() 3 "+classDirectory);
				}
 
			} catch (Exception e) {
				e.printStackTrace();
			}
 
			if (!cached) {
				return classDirectory;
			}
			applicationPath = classDirectory;
		}
		return applicationPath;
	}