package auxtestlib;
   
   import java.io.File;
   import java.io.IOException;
   
   /**
    * Class that provides utility methods to work with jars.
    */
   public final class JarUtils {
  	/**
  	 * Utility class: no constructor
  	 */
  	private JarUtils() {
  		/*
  		 * Nothing to do.
  		 */
  	}
  
  	/**
  	 * Creates a jar from a directory. If the file already exists, this method
  	 * will throw an exception.
  	 * 
  	 * @param directory the jar's base directory
  	 * @param jarFile the file to create. If it is <code>null</code> the jar's
  	 * name will be the directory name followed by <code>.jar</code> (the file
  	 * is created in the same parent directory as the base directory)
  	 * 
  	 * @return o the file with the jar
  	 * 
  	 * @throws IOException the file already exists
  	 */
  	public static File makeJar(File directory, File jarFile) throws IOException {
  		if (directory == null) {
  			throw new IllegalArgumentException("directory == null");
  		}
  
  		if (!directory.exists()) {
  			throw new IllegalArgumentException("Directory '"
  					+ directory.getAbsolutePath() + "' doesnt't exist.");
  		}
  
  		if (!directory.isDirectory()) {
  			throw new IllegalArgumentException("File '"
  					+ directory.getAbsolutePath() + "' is not a directory.");
  		}
  
  		File parent = directory.getParentFile();
  		if (parent == null) {
  			throw new IllegalArgumentException("Directory '"
  					+ directory.getAbsolutePath() + "' does not name a parent.");
  		}
  
  		File jfile = jarFile;
  
  		if (jfile == null) {
  			jfile = new File(parent, directory.getName() + ".jar");
  		}
  
  		if (jfile.exists()) {
  			throw new IllegalArgumentException("Jar file '"
  					+ jfile.getAbsolutePath() + "' already exists.");
  		}
  
  		String args[] = new String[] { "jar", "cf", jfile.getAbsolutePath(),
  				directory.getName() };
  
  		CommandRunner cr = new CommandRunner();
  
  		// TODO: We must find some way to handle the timeout.
  		cr.run_command(args, parent, 60);
  		return jfile;
  	}
  
  	/**
  	 * Creates a jar from a directory contents (not the directory itself). If
  	 * teh file already exists, the method will throw an exception.
  	 * 
  	 * @param directory the jar's base directory
  	 * @param jarFile jar file to create. If <code>null</code> the jar is
  	 * created with the same parent as the directory and it's name is the
  	 * directory name followed by <code>.jar</code>
  	 * 
  	 * @return the created jar file
  	 * 
  	 * @throws IOException file already exists
  	 */
  	public static File makeFullJar(File directory, File jarFile)
  			throws IOException {
  		if (directory == null) {
  			throw new IllegalArgumentException("directory == null");
  		}
  
  		if (jarFile == null) {
  			throw new IllegalArgumentException("jarFile == null");
  		}
  
  		if (!directory.exists()) {
  			throw new IllegalArgumentException("Directory '"
  					+ directory.getAbsolutePath() + "' doesnt't exist.");
 		}
 
 		if (!directory.isDirectory()) {
 			throw new IllegalArgumentException("File '"
 					+ directory.getAbsolutePath() + "' is not a directory.");
 		}
 
 		if (jarFile.exists()) {
 			throw new IllegalArgumentException("Jar file '"
 					+ jarFile.getAbsolutePath() + "' already exists.");
 		}
 
 		File files[] = directory.listFiles();
 		String args[] = new String[3 + files.length];
 		args[0] = "jar";
 		args[1] = "cf";
 		args[2] = jarFile.getAbsolutePath();
 		for (int i = 0; i < files.length; i++) {
 			args[3 + i] = files[i].getName();
 		}
 
 		CommandRunner cr = new CommandRunner();
 
 		// TODO: We must handle the timeout
 		cr.run_command(args, directory, 60);
 		return jarFile;
 	}
 }