Examples of org.apache.qpid.util.CommandLineParser

org.apache.qpid.util.CommandLineParser

CommandLineParser provides a utility for specifying the format of a command line and parsing command lines to ensure that they fit their specified format. A command line is made up of flags and options, both may be refered to as options. A flag is an option that does not take an argument (specifying it means it has the value 'true' and not specifying it means it has the value 'false'). Options must take arguments but they can be set up with defaults so that they take a default value when not set. Options may be mandatory in wich case it is an error not to specify them on the command line. Flags are never mandatory because they are implicitly set to false when not specified.

Some example command lines are:

This one has two options that expect arguments:

 cruisecontrol -configfile cruisecontrol.xml -port 9000

This has one no-arg flag and two 'free' arguments:
```
 zip -r project.zip project/ 
```

This one concatenates multiple flags into a single block with only one '-':

 jar -tvf mytar.tar

The parsing rules are:

Flags may be combined after a single '-' because they never take arguments. Normally such flags are single letter flags but this is only a convention and not enforced. Flags of more than one letter are usually specified on their own.
Options expecting arguments must always be on their own.
The argument to an option may be seperated from it by whitespace or appended directly onto the option.
The argument to an option may never begin with a '-' character.
All other arguments not beginning with a '-' character are free arguments that do not belong to any option.
The second or later of a set of duplicate or repeated flags are ignored.
Options are matched up to the shortest matching option. This is because of the possibility of having no space between an option and its argument. This rules out the possibility of using two options where one is an opening substring of the other. For example, the options "foo" and "foobar" cannot be used on the same command line because it is not possible to distinguish the argument "-foobar" from being the "foobar" option or the "foo" option with the "bar" argument.

By default, unknown options are simply ignored if specified on the command line. This behaviour may be changed so that the parser reports all unknowns as errors by using the {@link #setErrorsOnUnknowns} method.

CRC Card
Responsibilities	Collaborations
Accept a command line specification.
Parse a command line into properties, validating it against its specification.
Report all errors between a command line and its specification.
Provide a formatted usage string for a command line.
Provide a formatted options in force string for a command line.
Allow errors on unknowns behaviour to be turned on or off.

     */
    public static void main(String[] args)
    {
        // Process the command line using standard handling (errors and usage followed by System.exit when it is wrong).
        Properties options =
            CommandLineParser.processCommandLine(args, new CommandLineParser(COMMAND_LINE_SPEC), System.getProperties());


        // Extract the from and to directory locations and perform a backup between them.
        try
        {
            String fromDir = options.getProperty("fromdir");

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     */
    public static void main(String[] args)
    {
        // Process the command line using standard handling (errors and usage followed by System.exit when it is wrong).
        Properties options =
            CommandLineParser.processCommandLine(args, new CommandLineParser(COMMAND_LINE_SPEC), System.getProperties());


        // Extract the from and to directory locations and perform a backup between them.
        try
        {
            String fromDir = options.getProperty("fromdir");

View Full Code Here

     */
    public static void main(String[] args)
    {
        // Process the command line using standard handling (errors and usage followed by System.exit when it is wrong).
        Properties options =
            CommandLineParser.processCommandLine(args, new CommandLineParser(COMMAND_LINE_SPEC), System.getProperties());


        // Extract the from and to directory locations and perform a backup between them.
        try
        {
            String fromDir = options.getProperty("fromdir");

View Full Code Here

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