org.globus.util
Class Util

java.lang.Object
  org.globus.util.Util

public class Util
extends java.lang.Object

Constructor Summary

Util()

Method Summary

static java.io.File	createFile(java.lang.String filename) Attempts to create a new file in an atomic way.
static java.lang.String	decode(java.lang.String s) The function decodes URL-encoded strings into a regular string.
static boolean	destroy(java.io.File file) Overwrites the contents of the file with a random string and then deletes the file.
static boolean	destroy(java.lang.String file) Overwrites the contents of the file with a random string and then deletes the file.
static java.lang.String	formatTimeSec(long time) Generates string representation of given time specified as long.
static java.lang.String	getInput(java.lang.String prompt) Displays a prompt and then reads in the input from System.in.
static java.lang.String	getLocalHostAddress() Returns the ip address of the local machine.
static java.lang.String	getPrivateInput(java.lang.String prompt) Displays a prompt and then reads in private input from System.in.
static java.lang.String	quote(java.lang.String str) Quotifies a specified string.
static boolean	setFilePermissions(java.lang.String file, int mode) Sets permissions on a given file.
static boolean	setOwnerAccessOnly(java.lang.String file) Sets permissions on a given file to be only accessible by the current user.
static java.lang.String	unquote(java.lang.String str) Dequotifies a specified string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Util

public Util()

Method Detail

createFile

public static java.io.File createFile(java.lang.String filename)
                               throws java.lang.SecurityException,
                                      java.io.IOException

Attempts to create a new file in an atomic way. If the file already exists, it if first deleted.

Parameters:

filename - the name of file to create.

Returns:

the created file.

Throws:

java.lang.SecurityException - if the existing file cannot be deleted.

java.io.IOException - if an I/O error occurred.

setOwnerAccessOnly

public static boolean setOwnerAccessOnly(java.lang.String file)

Sets permissions on a given file to be only accessible by the current user.

See Also:

setFilePermissions(String, int)

setFilePermissions

public static boolean setFilePermissions(java.lang.String file,
                                         int mode)

Sets permissions on a given file. The permissions are set using the chmod command and will only work on Linux/Unix machines. Chmod command must be in the path.

Note: This function executes an external program; thus, its behavior is influenced by environment variables such as the caller's PATH and the environment variables that control dynamic loading. Care should be used if calling this function from a program that will be run as a Unix setuid program, or in any other manner in which the owner of the Unix process does not completely control its runtime environment.

Parameters:

file - the file to set the permissions of.

mode - the Unix style permissions.

Returns:

true, if change was successful, otherwise false. It can return false, in many instances, e.g. when file does not exits, when chmod is not found, or other error occurs.

destroy

public static boolean destroy(java.lang.String file)

Overwrites the contents of the file with a random string and then deletes the file.

Parameters:

file - file to remove

destroy

public static boolean destroy(java.io.File file)

Overwrites the contents of the file with a random string and then deletes the file.

Parameters:

file - file to remove

getInput

public static java.lang.String getInput(java.lang.String prompt)

Displays a prompt and then reads in the input from System.in.

Parameters:

prompt - the prompt to be displayed

Returns:

String the input read in (entered after the prompt)

getPrivateInput

public static java.lang.String getPrivateInput(java.lang.String prompt)

Displays a prompt and then reads in private input from System.in. Characters typed by the user are replaced with a space on the screen.

Parameters:

prompt - the prompt to be displayed

Returns:

String the input read in (entered after the prompt)

quote

public static java.lang.String quote(java.lang.String str)

Quotifies a specified string. The entire string is encompassed by double quotes and each " is replaced with \", \ is replaced with \\.

Parameters:

str - the string to quotify

Returns:

quotified and escaped string

unquote

public static java.lang.String unquote(java.lang.String str)
                                throws java.lang.Exception

Dequotifies a specified string. The quotes are removed and each \" is replaced with " and each \\ is replaced with \.

Parameters:

str - the string to dequotify.

Returns:

unquotified string.

Throws:

java.lang.Exception

decode

public static java.lang.String decode(java.lang.String s)

The function decodes URL-encoded strings into a regular string. This function is mostly copied from the Java source code. To convert to a String, each character is examined in turn:

• The remaining characters are represented by 3-character strings which begin with the percent sign, "%xy", where xy is the two-digit hexadecimal representation of the lower 8-bits of the character.

formatTimeSec

public static java.lang.String formatTimeSec(long time)

Generates string representation of given time specified as long. The format is: [days][,][h][,][min][,][sec]

getLocalHostAddress

public static java.lang.String getLocalHostAddress()

Returns the ip address of the local machine. If the 'ip' system property is defined it is returned, otherwise, the local ip address is lookup using the InetAddress class. In case the lookup fails, the address 127.0.0.1 is returned.

Returns:

local ip address