# Enum Class About

Object
Enum<About>
About

All Implemented Interfaces:
  `Serializable`, `Comparable<About>`, `Constable`

public enum About extends Enum<About>
Provides information about the Apache SIS running environment. This class collects information from various places like `Version​.SIS`, `System​.getProperties()`, `Locale​.getDefault()` or `TimeZone​.getDefault()`. This class does not collect every possible information. Instead, it tries to focus on the most important information for SIS, as determined by experience in troubleshooting. Some of those information are:

- Version numbers (SIS, Java, Operation system).
- Default locale, timezone and character encoding.
- Current directory, user home and Java home.
- Libraries on the module path.

Since:
  0.3

- ## Nested Class Summary

  ### Nested classes/interfaces inherited from class Enum

  `Enum​.EnumDesc<E extends Enum<E>>`

- ## Enum Constant Summary

  Enum Constants
  Enum Constant
  Description
  `LIBRARIES`
  Information about the libraries.
  `LOCALIZATION`
  Information about default locale, timezone and character encoding.
  `LOGGING`
  Information about logging.
  `PATHS`
  Information about user home directory, java installation directory or other kind of data.
  `PLUGINS`
  Information about available plugins.
  `VERSIONS`
  Information about software version numbers.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static TreeTable`
  `configuration()`
  Returns all known information about the current Apache SIS running environment.
  `static TreeTable`
  `configuration(Set<About> sections, Locale locale, TimeZone timezone)`
  Returns a subset of the information about the current Apache SIS running environment.
  `static About`
  `valueOf(String name)`
  Returns the enum constant of this class with the specified name.
  `static About[]`
  `values()`
  Returns an array containing the constants of this enum class, in the order they are declared.

  ### Methods inherited from class Enum

  `clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

  ### Methods inherited from class Object

  `getClass, notify, notifyAll, wait, wait, wait`

- ## Enum Constant Details

  - ### VERSIONS

    public static final About VERSIONS
    Information about software version numbers. This section includes:
    - Apache SIS version
    - Java runtime version and vendor
    - Operation system name and version
    - EPSG geodetic dataset in use

  - ### LOCALIZATION

    public static final About LOCALIZATION
    Information about default locale, timezone and character encoding. This section includes:
    - Default locale, completed by ISO 3-letter codes
    - Default timezone, completed by timezone offset
    - Current date and time in the default timezone
    - Default character encoding

  - ### PLUGINS

    public static final About PLUGINS
    Information about available plugins. This section includes:
    - List of data store implementations
    Since:
      0.8

  - ### LOGGING

    public static final About LOGGING
    Information about logging.

  - ### PATHS

    public static final About PATHS
    Information about user home directory, java installation directory or other kind of data. This section includes:
    - User directory
    - Default directory
    - SIS data directory
    - Temporary directory
    - Java home directory

  - ### LIBRARIES

    public static final About LIBRARIES
    Information about the libraries. This section includes:
    - JAR files in the extension directories
    - JAR files and directories in the application module path

- ## Method Details

  - ### values

    public static About[] values()
    Returns an array containing the constants of this enum class, in the order they are declared.
    Returns:
      an array containing the constants of this enum class, in the order they are declared

  - ### valueOf

    public static About valueOf(String name)
    Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
    Parameters:
      `name` - the name of the enum constant to be returned.
    Returns:
      the enum constant with the specified name
    Throws:
      `IllegalArgumentException` - if this enum class has no constant with the specified name
      `NullPointerException` - if the argument is null

  - ### configuration

    public static TreeTable configuration()
    Returns all known information about the current Apache SIS running environment. The information are formatted using the system default locale and timezone.

    This convenience method is equivalent to the following code:

        return configuration(EnumSet.allOf(About.class), null, null);

    Returns:
      configuration information, as a tree for grouping some configuration by sections.

  - ### configuration

    public static TreeTable configuration(Set<About> sections, Locale locale, TimeZone timezone)
    Returns a subset of the information about the current Apache SIS running environment.
    Parameters:
      `sections` - the section for which information are desired.
      `locale` - the locale to use for formatting the texts in the tree, or `null` for the default.
      `timezone` - the timezone to use for formatting the dates, or `null` for the default.
    Returns:
      configuration information, as a tree for grouping some configuration by sections.