package FileSystem;

/**
 * You should use this class to generate the strings you need to print as error
 * messages. Do not modify anything in this class.
 * 
 */
public class ErrorMessage {

    public static enum Errors {
	UNRECOGNIZED_COMMAND, // the first word on the command line isn't one of
			      // the commands to be interpreted. (Note: a blank
			      // command line isn't an error; it should be
			      // ignored.)
	WRONG_NUMBER_ARGUMENTS, // Wrong number [of] arguments
	ILLEGAL_FILE_NAME, // an attempt is being made to create a file
	// using create, mkdir, cp, or mvÑwhose name contains other than
	// alphanumeric characters.
	FILE_NOT_FOUND, // an argument, in any command other than create, mkdir,
			// or pwd, names a file that doesn't exist. (In a path
			// name argument, the nonexistent file could be one of
			// the directories on the path.)
	FILE_NOT_A_DIRECTORY, // an argument to cd, lstree, or rmdir is a text
			      // file rather than a directory, or a component of
			      // a relative or absolute path name argument to
			      // any command but pwd is a text file when it
			      // should be a directory.
	FILE_NOT_A_TEXT_FILE, // an argument to cat or rm is a directory rather
			      // than a text file.
	FILE_EXISTS, // an attempt is being made in a create, mkdir, cp, or mv
		     // command to create a file that already exists.
	NONEMPTY_DIRECTORY, // an attempt is being made to remove a nonempty
			    // directory with rmdir.
	CURRENT_DIRECTORY, // an attempt to remove the current working directory
	IDENTICAL_FILES, // the arguments to cp or mv refer to the same file.
	DESTINATION_WITHIN_SOURCE
    }; // an attempt is being made to move (mv) or copy (cp) a directory into
       // one of its subdirectories.

    public static String message(Errors e, String s) {
	switch (e) {
	case UNRECOGNIZED_COMMAND:
	    // s is the unrecognized command, the first word on the command
	    // line.
	    return "Unrecognized command: " + s;
	case WRONG_NUMBER_ARGUMENTS:
	    // s is the command, the first word on the command line.
	    return "Wrong number of arguments: " + s;
	case ILLEGAL_FILE_NAME:
	    // s is the part of the argument that contains the illegal file
	    // name,
	    // that is, the word that in a legal file name would consist solely
	    // of alphanumeric characters.
	    return "Illegal file name: " + s;
	case FILE_NOT_FOUND:
	    // s is the command-line argument that names the unlocatable file.
	    return "File not found: " + s;
	case FILE_NOT_A_DIRECTORY:
	    // s is the command-line argument that names the text file.
	    return "File not a directory: " + s;
	case FILE_NOT_A_TEXT_FILE:
	    // s is the command-line argument that names the directory.
	    return "File not a text file: " + s;
	case FILE_EXISTS:
	    // s is the command-line argument that names the incorrectly
	    // existing file.
	    return "File exists: " + s;
	case CURRENT_DIRECTORY:
	    // s is the command-line argument that names the directory to
	    // remove,
	    // namely the working directory.
	    return "Can't remove current directory: " + s;
	case NONEMPTY_DIRECTORY:
	    // s is the command-line argument that names the nonempty directory.
	    return "Nonempty directory: " + s;
	}
	return "";
    }

    public static String message(Errors e, String s1, String s2) {
	switch (e) {
	case IDENTICAL_FILES:
	    // s1 and s2 are the command-line arguments that name the same file.
	    return "Identical files: " + s1 + " " + s2;
	case DESTINATION_WITHIN_SOURCE:
	    // s1 is the command-line argument that names the source directory;
	    // s2 is the argument that names the destination that's somewhere
	    // within the source.
	    return "Source contains destination: " + s1 + " " + s2;
	}
	return "";
    }
}