jas.util
Class GetOptions

java.lang.Object
  jas.util.GetOptions

public class GetOptions
extends Object

GetOptions is used to help parse command line arguments. It is loosely based on Paul Raines' GetOpt module with modifications to handle multiple classes wanting access to the same arguments. The main design difference is that instead of doing all the work in the constructor we do it with addOption() and parseArgs(). Furthermore, the Hashtables are different, etc.

Author:

Peter Armstrong

Nested Class Summary

static class

GetOptions.BadArguments Exception to throw when an invalid argument is encountered.

Field Summary

protected Hashtable	longToComment Maps a long option to its comment.
protected Hashtable	longToIsFlagMap Maps a long option to whether it is a flag (takes no parameters).
protected Hashtable	longToOptionsMap The storage of options.
protected String[]	params The list of arguments that followed the options.
protected Vector	pVector Vector used to dynamically build options.
protected Hashtable	shortToLongMap Maps a short option to its equivalent long one.

Constructor Summary

GetOptions()
Creates an empty GetOptions object.

Method Summary

void	addOption(char shortName, boolean flag) Adds an option to be recognized by parseArgs.
void	addOption(char shortName, boolean flag, String comment) Adds an option to be recognized by parseArgs.
void	addOption(String longName, boolean flag) Adds an option to be recognized by parseArgs.
void	addOption(String longName, boolean flag, String comment) Adds an option to be recognized by parseArgs.
void	addOption(String longName, char shortName, boolean flag) Adds an option to be recognized by parseArgs.
void	addOption(String longName, char shortName, boolean flag, String comment) Adds an option to be recognized by parseArgs.
void	addParam(String param) Add a parmeter
void	dumpOptions()
String	getComment(String longName) Returns the comment given for the option with the long name longName.
String	getOption(String longName) Returns the value given for the option with the long name longName.
String	getParam(int pNum) Returns a specific parameter
String[]	getParams() Returns list of parameters
boolean	hasOption(String longName) Returns true or false depending on if the option with the long name longName was given in either the short (if one exists) or the long form.
boolean	isLegalOption(String longName) Returns true or false depending on if the option with the long name longName is in fact a real option.
int	numParams() Returns number of parameters
void	parseArgs(String[] argv) Parses the command line arguments.

Methods inherited from class java.lang.Object

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

Field Detail

params

protected String[] params

The list of arguments that followed the options.

pVector

protected Vector pVector

Vector used to dynamically build options.

shortToLongMap

protected Hashtable shortToLongMap

Maps a short option to its equivalent long one.

longToIsFlagMap

protected Hashtable longToIsFlagMap

Maps a long option to whether it is a flag (takes no parameters).

longToComment

protected Hashtable longToComment

Maps a long option to its comment.

longToOptionsMap

protected Hashtable longToOptionsMap

The storage of options. An option can have either no value or a String value of colon-delimited arguments.

Constructor Detail

GetOptions

public GetOptions()

Creates an empty GetOptions object. Options are added to the object using the addOption method, unlike GetOpt which adds them in the constructor.

Method Detail

addOption

public void addOption(String longName,
                      boolean flag)

Adds an option to be recognized by parseArgs.

Parameters:

longName - the full name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

addOption

public void addOption(String longName,
                      boolean flag,
                      String comment)

Adds an option to be recognized by parseArgs.

Parameters:

longName - the full name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

comment - description of the arguments to the option

addOption

public void addOption(char shortName,
                      boolean flag)

Adds an option to be recognized by parseArgs.

Parameters:

shortName - the single character name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

addOption

public void addOption(char shortName,
                      boolean flag,
                      String comment)

Adds an option to be recognized by parseArgs.

Parameters:

shortName - the single character name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

comment - description of the arguments to the option

addOption

public void addOption(String longName,
                      char shortName,
                      boolean flag)

Adds an option to be recognized by parseArgs.

Parameters:

longName - the full name of the option

shortName - the single character name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

addOption

public void addOption(String longName,
                      char shortName,
                      boolean flag,
                      String comment)

Adds an option to be recognized by parseArgs.

Parameters:

longName - the full name of the option

shortName - the single character name of the option

flag - true if the option is a flag (takes 0 parameters), false otherwise

comment - description of the arguments to the option

isLegalOption

public boolean isLegalOption(String longName)

Returns true or false depending on if the option with the long name longName is in fact a real option.

Parameters:

longName - a string describing the option to query for.

Returns:

true or false.

hasOption

public boolean hasOption(String longName)

Returns true or false depending on if the option with the long name longName was given in either the short (if one exists) or the long form.

Parameters:

longName - a string describing the option to query for.

Returns:

true or false.

getOption

public String getOption(String longName)

Returns the value given for the option with the long name longName. Returns "FLAG" if the option was given but is a flag (takes no arguments).

Parameters:

longName - a string describing the option to query for.

Returns:

value of option, "FLAG" or null.

getComment

public String getComment(String longName)

Returns the comment given for the option with the long name longName.

Parameters:

longName - a string describing the option to query for.

Returns:

value of comment or null if no comment exists.

dumpOptions

public void dumpOptions()

parseArgs

public void parseArgs(String[] argv)
               throws GetOptions.BadArguments

Parses the command line arguments.

Parameters:

argv - the array of arguments (eg. args as given to main())

Throws:

GetOptions.BadArguments - an invalid arg or wrong # of args is encountered

getParams

public String[] getParams()

Returns list of parameters

getParam

public String getParam(int pNum)

Returns a specific parameter

numParams

public int numParams()

Returns number of parameters

addParam

public void addParam(String param)

Add a parmeter