visad.util
Interface CmdlineConsumer

All Known Implementing Classes:

CmdlineGenericConsumer, Main, NuView, TestDownload, TestUtil, TriangleStripBuilderTest, UpdateJar

public interface CmdlineConsumer

Method Summary

int	checkKeyword(String mainName, int thisArg, String[] args) Handle subclass-specific command line options and their arguments.
int	checkOption(String mainName, char ch, String arg) Handle subclass-specific command line options and their arguments.
boolean	finalizeArgs(String mainName) Validate arguments after argument parsing has finished.
void	initializeArgs() Method used to initialize any instance variables which may be changed by a cmdline option.
String	keywordUsage() A short string included in the usage message to indicate valid keywords.
String	optionUsage() A short string included in the usage message to indicate valid options.

Method Detail

initializeArgs

void initializeArgs()

Method used to initialize any instance variables which may be changed by a cmdline option.

This is needed when arguments are processed inside the constructor. If the first line in the constructor in a class which extends this class is super(args), CmdlineParser will be run before any instance variables for the extending class are initialized.

To ensure all instance variables are properly initialized, place the initialization code in the initializeArgs() method.

checkOption

int checkOption(String mainName,
                char ch,
                String arg)

Handle subclass-specific command line options and their arguments.

If -abc -d efg -h -1 -i is specified, this method will be called a maximum of 5 times:

• checkOption(mainName, 'a', "bc");
• checkOption(mainName, 'd', "efg");
• checkOption(mainName, 'h', "-1");
• checkOption(mainName, '1', "-i");
• checkOption(mainName, 'i', null);

Note that either of the last two method calls may not happen if the preceeding method call claims to have used the following argument (by returning 2.

For example, if the third call (where ch is set to 'h') returns 0 or 1, the next call will contain '1' and "-i". If, however, the third call returns 2, the next call will contain 'i' and null.

Parameters:

mainName - The name of the main class (useful for error messages.)

ch - Option character. If -a is specified on the command line, 'a' would be passed to this method.)

arg - The argument associated with this option.

Returns:

less than 0 to indicate an error
0 to indicate that this option is not used by this class
1 to indicate that only the option was used
2 or greater to indicate that both the option and the argument were used

optionUsage

String optionUsage()

A short string included in the usage message to indicate valid options. An example might be "[-t type]".

Returns:

A very terse description string.

checkKeyword

int checkKeyword(String mainName,
                 int thisArg,
                 String[] args)

Handle subclass-specific command line options and their arguments.

Parameters:

mainName - The name of the main class (useful for error messages.)

thisArg - The index of the current keyword.

args - The full list of arguments.

Returns:

less than 0 to indicate an error
0 to indicate that this argument is not used by this class
1 or more to indicate the number of arguments used

keywordUsage

String keywordUsage()

A short string included in the usage message to indicate valid keywords.

An example might be "[username] [password]".

Returns:

A very terse description string.

finalizeArgs

boolean finalizeArgs(String mainName)

Validate arguments after argument parsing has finished.

This is useful for verifying that all required keywords and options have been specified, that options don't conflict with one another, etc.

Parameters:

mainName - The name of the main class (useful for error messages.)

Returns:

true if everything is correct, false if there is a problem.