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## org.apache.commons.cli
Class Parser

    java.lang.Object
      org.apache.commons.cli.Parser

All Implemented Interfaces:
  CommandLineParser

Direct Known Subclasses:
  BasicParser, GnuParser, PosixParser

    public abstract class Parser

extends Object
implements CommandLineParser

`Parser` creates `CommandLine`s.

Version:
  $Revision: 680644 $, $Date: 2008-07-29 01:13:48 -0700 (Tue, 29 Jul 2008) $
Author:
  John Keyes (john at integralsource.com)

Field Summary
`protected CommandLine` | `cmd` commandline instance

Constructor Summary
`Parser()`

Method Summary
`protected void` | `checkRequiredOptions()` Throws a `MissingOptionException` if all of the required options are not present.
`protected abstract String[]` | `flatten(Options opts, String[] arguments, boolean stopAtNonOption)` Subclasses must implement this method to reduce the `arguments` that have been passed to the parse method.
`protected Options` | `getOptions()`
`protected List` | `getRequiredOptions()`
`CommandLine` | `parse(Options options, String[] arguments)` Parses the specified `arguments` based on the specifed `Options`.
`CommandLine` | `parse(Options options, String[] arguments, boolean stopAtNonOption)` Parses the specified `arguments` based on the specifed `Options`.
`CommandLine` | `parse(Options options, String[] arguments, Properties properties)` Parse the arguments according to the specified options and properties.
`CommandLine` | `parse(Options options, String[] arguments, Properties properties, boolean stopAtNonOption)` Parse the arguments according to the specified options and properties.
`void` | `processArgs(Option opt, ListIterator iter)` Process the argument values for the specified Option `opt` using the values retrieved from the specified iterator `iter`.
`protected void` | `processOption(String arg, ListIterator iter)` Process the Option specified by `arg` using the values retrieved from the specfied iterator `iter`.
`protected void` | `processProperties(Properties properties)` Sets the values of Options using the values in `properties`.
`protected void` | `setOptions(Options options)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### cmd

    protected CommandLine cmd

  commandline instance

Constructor Detail

### Parser

    public Parser()

Method Detail

### setOptions

    protected void setOptions(Options options)

### getOptions

    protected Options getOptions()

### getRequiredOptions

    protected List getRequiredOptions()

### flatten

    protected abstract String[] flatten(Options opts,
                                        String[] arguments,
                                        boolean stopAtNonOption)

  Subclasses must implement this method to reduce the `arguments` that have been passed to the parse method.

  Parameters:
    `opts` - The Options to parse the arguments by.
    `arguments` - The arguments that have to be flattened.
    `stopAtNonOption` - specifies whether to stop flattening when a non option has been encountered
  Returns:
    a String array of the flattened arguments

### parse

    public CommandLine parse(Options options,
                             String[] arguments)
                      throws ParseException

  Parses the specified `arguments` based on the specifed `Options`.

  Specified by:
    `parse` in interface `CommandLineParser`
  Parameters:
    `options` - the `Options`
    `arguments` - the `arguments`
  Returns:
    the `CommandLine`
  Throws:
    `ParseException` - if an error occurs when parsing the arguments.

### parse

    public CommandLine parse(Options options,
                             String[] arguments,
                             Properties properties)
                      throws ParseException

  Parse the arguments according to the specified options and properties.

  Parameters:
    `options` - the specified Options
    `arguments` - the command line arguments
    `properties` - command line option name-value pairs
  Returns:
    the list of atomic option and value tokens
  Throws:
    `ParseException` - if there are any problems encountered while parsing the command line tokens.
  Since:
    1.1

### parse

    public CommandLine parse(Options options,
                             String[] arguments,
                             boolean stopAtNonOption)
                      throws ParseException

  Parses the specified `arguments` based on the specifed `Options`.

  Specified by:
    `parse` in interface `CommandLineParser`
  Parameters:
    `options` - the `Options`
    `arguments` - the `arguments`
    `stopAtNonOption` - specifies whether to stop interpreting the arguments when a non option has been encountered and to add them to the CommandLines args list.
  Returns:
    the `CommandLine`
  Throws:
    `ParseException` - if an error occurs when parsing the arguments.

### parse

    public CommandLine parse(Options options,
                             String[] arguments,
                             Properties properties,
                             boolean stopAtNonOption)
                      throws ParseException

  Parse the arguments according to the specified options and properties.

  Parameters:
    `options` - the specified Options
    `arguments` - the command line arguments
    `properties` - command line option name-value pairs
    `stopAtNonOption` - stop parsing the arguments when the first non option is encountered.
  Returns:
    the list of atomic option and value tokens
  Throws:
    `ParseException` - if there are any problems encountered while parsing the command line tokens.
  Since:
    1.1

### processProperties

    protected void processProperties(Properties properties)

  Sets the values of Options using the values in `properties`.

  Parameters:
    `properties` - The value properties to be processed.

### checkRequiredOptions

    protected void checkRequiredOptions()
                                 throws MissingOptionException

  Throws a `MissingOptionException` if all of the required options are not present.

  Throws:
    `MissingOptionException` - if any of the required Options are not present.

### processArgs

    public void processArgs(Option opt,
                            ListIterator iter)
                     throws ParseException

  Process the argument values for the specified Option `opt` using the values retrieved from the specified iterator `iter`.

  Parameters:
    `opt` - The current Option
    `iter` - The iterator over the flattened command line Options.
  Throws:
    `ParseException` - if an argument value is required and it is has not been found.

### processOption

    protected void processOption(String arg,
                                 ListIterator iter)
                          throws ParseException

  Process the Option specified by `arg` using the values retrieved from the specfied iterator `iter`.

  Parameters:
    `arg` - The String value representing an Option
    `iter` - The iterator over the flattened command line arguments.
  Throws:
    `ParseException` - if `arg` does not represent an Option

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