org.apache.sis.console

## Class Command

- Object
- - Command

-     public final class Command
      extends Object

  Command line interface for Apache SIS. The `main(String[])` method accepts the following actions:

  > `help` | Show a help overview.
  > `about` | Show information about Apache SIS and system configuration.
  > `mime-type` | Show MIME type for the given file.
  > `metadata` | Show metadata information for the given file.
  > `crs` | Show Coordinate Reference System information for the given file or code.
  > `identifier` | Show identifiers for metadata and referencing systems in the given file.
  > `transform` | Convert or transform coordinates from given source CRS to target CRS.

  Each command can accepts some of the following options:

  > `--sourceCRS` | The Coordinate Reference System of input data.
  > `--targetCRS` | The Coordinate Reference System of output data.
  > `--format` | The output format: `xml`, `wkt`, `wkt1` or `text`.
  > `--locale` | The locale to use for the command output.
  > `--timezone` | The timezone for the dates to be formatted.
  > `--encoding` | The encoding to use for the command outputs and some inputs.
  > `--colors` | Whether colorized output shall be enabled.
  > `--brief` | Whether the output should contains only brief information.
  > `--verbose` | Whether the output should contains more detailed information.
  > `--debug` | Prints full stack trace in case of failure.
  > `--help` | Lists the options available for a specific command.

  The `--locale`, `--timezone` and `--encoding` options apply to the command output sent to the standard output stream, but usually do not apply to the error messages sent to the standard error stream. The reason is that command output may be targeted to a client, while the error messages are usually for the operator.
  SIS installation on remote machines
  Some sub-commands can operate on SIS installation on remote machines, provided that remote access has been enabled at the Java Virtual Machine startup time. See package javadoc for more information.
  Since:
    0.3

  Defined in the `sis-console` module

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `INVALID_ARGUMENT_EXIT_CODE` The code given to `System​.exit(int)` when the program failed because of an illegal user argument.
    `static int` | `INVALID_COMMAND_EXIT_CODE` The code given to `System​.exit(int)` when the program failed because of a unknown sub-command.
    `static int` | `INVALID_OPTION_EXIT_CODE` The code given to `System​.exit(int)` when the program failed because of a unknown option.
    `static int` | `IO_EXCEPTION_EXIT_CODE` The code given to `System​.exit(int)` when the program failed because of an `IOException`.
    `static int` | `OTHER_ERROR_EXIT_CODE` The code given to `System​.exit(int)` when the program failed for a reason other than the ones enumerated in the above constants.
    `static int` | `SQL_EXCEPTION_EXIT_CODE` The code given to `System​.exit(int)` when the program failed because of an `SQLException`.
    `static int` | `UNKNOWN_STORAGE_EXIT_CODE` The code given to `System​.exit(int)` when a file given in argument uses an unknown file format.

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `Command(String[] args)` Creates a new command for the given arguments.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static int` | `exitCodeFor(Throwable cause)` Returns the exit code for the given exception, or 0 if unknown.
    `static void` | `main(String[] args)` Prints the information to the standard output stream.
    `int` | `run()` Runs the command.

    - ### Methods inherited from class Object

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

- - ### Field Detail

    - #### INVALID_COMMAND_EXIT_CODE

          public static final int INVALID_COMMAND_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed because of a unknown sub-command.
      See Also:
        Constant Field Values

    - #### INVALID_OPTION_EXIT_CODE

          public static final int INVALID_OPTION_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed because of a unknown option. The set of valid options depend on the sub-command to execute.
      See Also:
        Constant Field Values

    - #### INVALID_ARGUMENT_EXIT_CODE

          public static final int INVALID_ARGUMENT_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed because of an illegal user argument. The user arguments are everything which is not a command name or an option. They are typically file names, but can occasionally be other types like URL.
      See Also:
        Constant Field Values

    - #### UNKNOWN_STORAGE_EXIT_CODE

          public static final int UNKNOWN_STORAGE_EXIT_CODE

      The code given to `System​.exit(int)` when a file given in argument uses an unknown file format.
      See Also:
        Constant Field Values

    - #### IO_EXCEPTION_EXIT_CODE

          public static final int IO_EXCEPTION_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed because of an `IOException`.
      See Also:
        Constant Field Values

    - #### SQL_EXCEPTION_EXIT_CODE

          public static final int SQL_EXCEPTION_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed because of an `SQLException`.
      See Also:
        Constant Field Values

    - #### OTHER_ERROR_EXIT_CODE

          public static final int OTHER_ERROR_EXIT_CODE

      The code given to `System​.exit(int)` when the program failed for a reason other than the ones enumerated in the above constants.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### Command

          protected Command(String[] args)
                     throws InvalidCommandException,
                            InvalidOptionException

      Creates a new command for the given arguments. The first value in the given array which is not an option is taken as the command name. All other values are options or filenames.
      Parameters:
        `args` - the command-line arguments.
      Throws:
        `InvalidCommandException` - if an invalid command has been given.
        `InvalidOptionException` - if the given arguments contain an invalid option.

  - ### Method Detail

    - #### run

          public int run()
                  throws Exception

      Runs the command. If an exception occurs, then the exception message is sent to the error output stream before to be thrown. Callers can map the exception to a system exit code by the `exitCodeFor(Throwable)` method.
      Returns:
        0 on success, or an exit code if the command failed for a reason other than a Java exception.
      Throws:
        `Exception` - if an error occurred during the command execution. This is typically, but not limited, to `IOException`, `SQLException`, `DataStoreException` or `TransformException`.

    - #### exitCodeFor

          public static int exitCodeFor(Throwable cause)

      Returns the exit code for the given exception, or 0 if unknown. This method iterates through the causes until an exception matching a `*_EXIT_CODE` constant is found.
      Parameters:
        `cause` - the exception for which to get the exit code.
      Returns:
        the exit code as one of the `*_EXIT_CODE` constant, or `OTHER_ERROR_EXIT_CODE` if unknown.

    - #### main

          public static void main(String[] args)

      Prints the information to the standard output stream.
      Parameters:
        `args` - command-line options.

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