org.apache.xalan.xsltc.cmdline.getopt

Class GetOpt

java.lang.Object

org.apache.xalan.xsltc.cmdline.getopt.GetOpt

public class GetOpt
extends Object

GetOpt is a Java equivalent to the C getopt() library function discussed in man page getopt(3C). It provides command line parsing for Java applications. It supports the most rules of the command line standard (see man page intro(1)) including stacked options such as '-sxm' (which is equivalent to -s -x -m); it handles special '--' option that signifies the end of options. Additionally this implementation of getopt will check for mandatory arguments to options such as in the case of '-d ' it will throw a MissingOptArgException if the option argument '' is not included on the commandline. getopt(3C) does not check for this.

Author:

G Todd Miller

Constructor Summary

Constructors

Constructor and Description
GetOpt(String[] args, String optString)

Method Summary

Methods

Modifier and Type	Method and Description
String[]	getCmdArgs() gets list of the commandline arguments.
int	getNextOption() gets the next option found in the commandline.
String	getOptionArg() gets the argument for the current parsed option.
void	printOptions() debugging routine to print out all options collected

Methods inherited from class java.lang.Object

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

Constructor Detail

GetOpt

public GetOpt(String[] args,
      String optString)

Method Detail

printOptions

public void printOptions()

debugging routine to print out all options collected

getNextOption

public int getNextOption()
                  throws org.apache.xalan.xsltc.cmdline.getopt.IllegalArgumentException,
                         org.apache.xalan.xsltc.cmdline.getopt.MissingOptArgException

gets the next option found in the commandline. Distinguishes between two bad cases, one case is when an illegal option is found, and then other case is when an option takes an argument but no argument was found for that option. If the option found was not declared in the optString, then an IllegalArgumentException will be thrown (case 1). If the next option found has been declared to take an argument, and no such argument exists, then a MissingOptArgException is thrown (case 2).

Returns:

int - the next option found.

Throws:

IllegalArgumentException, - MissingOptArgException.

org.apache.xalan.xsltc.cmdline.getopt.IllegalArgumentException

org.apache.xalan.xsltc.cmdline.getopt.MissingOptArgException

getOptionArg

public String getOptionArg()

gets the argument for the current parsed option. For example, in case of '-d ', if current option parsed is 'd' then getOptionArg() would return ''.

Returns:

String - argument for current parsed option.

getCmdArgs

public String[] getCmdArgs()

gets list of the commandline arguments. For example, in command such as 'cmd -s -d file file2 file3 file4' with the usage 'cmd [-s] [-d ] ...', getCmdArgs() would return the list {file2, file3, file4}.

Returns:

String[] - list of command arguments that may appear after options and option arguments.