org.apache.sis.referencing

## Class AbstractReferenceSystem

- Object
- - FormattableObject
  - - AbstractIdentifiedObject
    - - AbstractReferenceSystem

- All Implemented Interfaces:
    Serializable, Deprecable, LenientComparable, IdentifiedObject, ReferenceSystem
  Direct Known Subclasses:
    AbstractCRS, ReferencingByIdentifiers

      public class AbstractReferenceSystem
      extends AbstractIdentifiedObject
      implements ReferenceSystem

  Description of a spatial and temporal reference system used by a dataset. Reference systems do not necessarily use coordinates. For example a reference system could use postal codes. The specialized case of referencing by coordinates is handled by the `AbstractCRS` subclass.

  This class inherits the name, aliases, identifiers and remarks from the parent class, and adds the following information:

  - a domain of validity, the area for which the reference system is valid,
  - a scope, which describes the domain of usage or limitation of usage.
  Instantiation
  This class is conceptually abstract, even if it is technically possible to instantiate it. Typical applications should create instances of the most specific subclass prefixed by `Default` instead.
  Immutability and thread safety
  This base class is immutable and thus thread-safe if the property values (not necessarily the map itself) given to the constructor are also immutable. Most SIS subclasses and related classes are immutable under similar conditions. This means that unless otherwise noted in the javadoc, `ReferenceSystem` instances created using only SIS factories and static constants can be shared by many objects and passed between threads without synchronization.
  Since:
    0.4
  See Also:
    Serialized Form

  Defined in the `sis-referencing` module

- - ### Field Summary

    - ### Fields inherited from class AbstractIdentifiedObject

      `DEPRECATED_KEY, LOCALE_KEY`

    - ### Fields inherited from interface ReferenceSystem

      `DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY`

    - ### Fields inherited from interface IdentifiedObject

      `ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `` | `AbstractReferenceSystem(Map<String,?> properties)` Constructs a reference system from the given properties.
    `protected` | `AbstractReferenceSystem(ReferenceSystem object)` Constructs a new reference system with the same values than the specified one.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected long` | `computeHashCode()` Invoked by `hashCode()` for computing the hash code when first needed.
    `boolean` | `equals(Object object, ComparisonMode mode)` Compares this reference system with the specified object for equality.
    `Extent` | `getDomainOfValidity()` Returns the region or timeframe in which this reference system is valid, or `null` if unspecified.
    `Class<? extends ReferenceSystem>` | `getInterface()` Returns the GeoAPI interface implemented by this class.
    `InternationalString` | `getScope()` Returns the domain or limitations of usage, or `null` if unspecified.

    - ### Methods inherited from class AbstractIdentifiedObject

      `castOrCopy, equals, formatTo, getAlias, getDescription, getIdentifiers, getName, getRemarks, hashCode, isDeprecated, isHeuristicMatchForName`

    - ### Methods inherited from class FormattableObject

      `print, toString, toString, toWKT`

    - ### Methods inherited from class Object

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

    - ### Methods inherited from interface IdentifiedObject

      `getAlias, getIdentifiers, getName, getRemarks, toWKT`

- - ### Constructor Detail

    - #### AbstractReferenceSystem

          public AbstractReferenceSystem(Map<String,?> properties)

      Constructs a reference system from the given properties. The properties given in argument follow the same rules than for the super-class constructor. Additionally, the following properties are understood by this constructor:

      Recognized properties (non exhaustive list)
      Property name | Value type | Returned by
      --- | --- | ---
      "domainOfValidity" | `Extent` | `getDomainOfValidity()`
      "scope" | `String` or `InternationalString` | `getScope()`
      Defined in parent class (reminder)
      "name" | `ReferenceIdentifier` or `String` | `AbstractIdentifiedObject.getName()`
      "alias" | `GenericName` or `CharSequence` (optionally as array) | `AbstractIdentifiedObject.getAlias()`
      "identifiers" | `ReferenceIdentifier` (optionally as array) | `AbstractIdentifiedObject.getIdentifiers()`
      "remarks" | `InternationalString` or `String` | `AbstractIdentifiedObject.getRemarks()`

      Parameters:
        `properties` - the properties to be given to this object.

    - #### AbstractReferenceSystem

          protected AbstractReferenceSystem(ReferenceSystem object)

      Constructs a new reference system with the same values than the specified one. This copy constructor provides a way to convert an arbitrary implementation into a SIS one or a user-defined one (as a subclass), usually in order to leverage some implementation-specific API.

      This constructor performs a shallow copy, i.e. the properties are not cloned.

      Parameters:
        `object` - the reference system to copy.

  - ### Method Detail

    - #### getInterface

          public Class<? extends ReferenceSystem> getInterface()

      Returns the GeoAPI interface implemented by this class. The default implementation returns `ReferenceSystem​.class`. Subclasses implementing a more specific GeoAPI interface shall override this method.
      Overrides:
        `getInterface` in class `AbstractIdentifiedObject`
      Returns:
        the GeoAPI interface implemented by this class.

    - #### getDomainOfValidity

          @Workaround(library="JDK",
                      version="1.8")
          public Extent getDomainOfValidity()

      Returns the region or timeframe in which this reference system is valid, or `null` if unspecified.
      Specified by:
        `getDomainOfValidity` in interface `ReferenceSystem`
      Returns:
        area or region or timeframe in which this (coordinate) reference system is valid, or `null`.
      See Also:
        `DefaultExtent`

    - #### getScope

          public InternationalString getScope()

      Returns the domain or limitations of usage, or `null` if unspecified.
      Specified by:
        `getScope` in interface `ReferenceSystem`
      Returns:
        description of domain of usage, or limitations of usage, for which this (coordinate) reference system object is valid, or `null`.

    - #### equals

          public boolean equals(Object object,
                                ComparisonMode mode)

      Compares this reference system with the specified object for equality. If the `mode` argument value is `STRICT` or `BY_CONTRACT`, then all available properties are compared including the domain of validity and the scope.
      Specified by:
        `equals` in interface `LenientComparable`
      Overrides:
        `equals` in class `AbstractIdentifiedObject`
      Parameters:
        `object` - the object to compare to `this`.
        `mode` - `STRICT` for performing a strict comparison, or `IGNORE_METADATA` for comparing only properties relevant to coordinate transformations.
      Returns:
        `true` if both objects are equal.
      See Also:
        `AbstractIdentifiedObject​.computeHashCode()`, `Utilities​.deepEquals(Object, Object, ComparisonMode)`

    - #### computeHashCode

          protected long computeHashCode()

      Invoked by `hashCode()` for computing the hash code when first needed. See `AbstractIdentifiedObject​.computeHashCode()` for more information.
      Overrides:
        `computeHashCode` in class `AbstractIdentifiedObject`
      Returns:
        the hash code value. This value may change in any future Apache SIS version.

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