org.springframework.core.env

## Class SimpleCommandLinePropertySource

- java.lang.Object
- - org.springframework.core.env.PropertySource<T>
  - - org.springframework.core.env.EnumerablePropertySource<T>
    - - org.springframework.core.env.CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>
      - - org.springframework.core.env.SimpleCommandLinePropertySource

-     public class SimpleCommandLinePropertySource
      extends CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>

  `CommandLinePropertySource` implementation backed by a simple String array.

  ### Purpose

  This `CommandLinePropertySource` implementation aims to provide the simplest possible approach to parsing command line arguments. As with all `CommandLinePropertySource` implementations, command line arguments are broken into two distinct groups: option arguments and non-option arguments, as described below (some sections copied from Javadoc for `SimpleCommandLineArgsParser`):

  ### Working with option arguments

  Option arguments must adhere to the exact syntax:

      --optName[=optValue]

  That is, options must be prefixed with "`--`" and may or may not specify a value. If a value is specified, the name and value must be separated without spaces by an equals sign ("="). The value may optionally be an empty string.

  #### Valid examples of option arguments

       --foo
       --foo=
       --foo=""
       --foo=bar
       --foo="bar then baz"
       --foo=bar,baz,biz

  #### Invalid examples of option arguments

       -foo
       --foo bar
       --foo = bar
       --foo=bar --foo=baz --foo=biz

  ### Working with non-option arguments

  Any and all arguments specified at the command line without the "`--`" option prefix will be considered as "non-option arguments" and made available through the `CommandLineArgs.getNonOptionArgs()` method.

  ### Typical usage

       public static void main(String[] args) {
           PropertySource<?> ps = new SimpleCommandLinePropertySource(args);
           // ...
       }

  See `CommandLinePropertySource` for complete general usage examples.

  ### Beyond the basics

  When more fully-featured command line parsing is necessary, consider using the provided `JOptCommandLinePropertySource`, or implement your own `CommandLinePropertySource` against the command line parsing library of your choice.

  Since:
    3.1
  Author:
    Chris Beams
  See Also:
    `CommandLinePropertySource`, `JOptCommandLinePropertySource`

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.springframework.core.env.PropertySource

      `PropertySource.StubPropertySource`

  - ### Field Summary

    - ### Fields inherited from class org.springframework.core.env.CommandLinePropertySource

      `COMMAND_LINE_PROPERTY_SOURCE_NAME, DEFAULT_NON_OPTION_ARGS_PROPERTY_NAME`

    - ### Fields inherited from class org.springframework.core.env.PropertySource

      `logger, name, source`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SimpleCommandLinePropertySource(String... args)` Create a new `SimpleCommandLinePropertySource` having the default name and backed by the given `String[]` of command line arguments.
    `SimpleCommandLinePropertySource(String name, String[] args)` Create a new `SimpleCommandLinePropertySource` having the given name and backed by the given `String[]` of command line arguments.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected boolean` | `containsOption(String name)` Return whether the set of option arguments parsed from the command line contains an option with the given name.
    `protected List<String>` | `getNonOptionArgs()` Return the collection of non-option arguments parsed from the command line.
    `protected List<String>` | `getOptionValues(String name)` Return the collection of values associated with the command line option having the given name.
    `String[]` | `getPropertyNames()` Get the property names for the option arguments.

    - ### Methods inherited from class org.springframework.core.env.CommandLinePropertySource

      `containsProperty, getProperty, setNonOptionArgsPropertyName`

    - ### Methods inherited from class org.springframework.core.env.PropertySource

      `equals, getName, getSource, hashCode, named, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### SimpleCommandLinePropertySource

          public SimpleCommandLinePropertySource(String... args)

      Create a new `SimpleCommandLinePropertySource` having the default name and backed by the given `String[]` of command line arguments.
      See Also:
        `CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME`, `CommandLinePropertySource(Object)`

    - #### SimpleCommandLinePropertySource

          public SimpleCommandLinePropertySource(String name,
                                                 String[] args)

      Create a new `SimpleCommandLinePropertySource` having the given name and backed by the given `String[]` of command line arguments.

  - ### Method Detail

    - #### getPropertyNames

          public String[] getPropertyNames()

      Get the property names for the option arguments.
      Specified by:
        `getPropertyNames` in class `EnumerablePropertySource<org.springframework.core.env.CommandLineArgs>`

    - #### containsOption

          protected boolean containsOption(String name)

      Description copied from class: `CommandLinePropertySource`
      Return whether the set of option arguments parsed from the command line contains an option with the given name.
      Specified by:
        `containsOption` in class `CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>`

    - #### getOptionValues

          @Nullable
          protected List<String> getOptionValues(String name)

      Description copied from class: `CommandLinePropertySource`
      Return the collection of values associated with the command line option having the given name.
      - if the option is present and has no argument (e.g.: "--foo"), return an empty collection (`[]`)
      - if the option is present and has a single value (e.g. "--foo=bar"), return a collection having one element (`["bar"]`)
      - if the option is present and the underlying command line parsing library supports multiple arguments (e.g. "--foo=bar --foo=baz"), return a collection having elements for each value (`["bar", "baz"]`)
      - if the option is not present, return `null`
      Specified by:
        `getOptionValues` in class `CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>`

    - #### getNonOptionArgs

          protected List<String> getNonOptionArgs()

      Description copied from class: `CommandLinePropertySource`
      Return the collection of non-option arguments parsed from the command line. Never `null`.
      Specified by:
        `getNonOptionArgs` in class `CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>`