# Class NamedIdentifier

Object
FormattableObject
ImmutableIdentifier
NamedIdentifier

All Implemented Interfaces:
  `Serializable`, `Comparable<GenericName>`, `Printable`, `Identifier`, `ReferenceIdentifier`, `GenericName`

public class NamedIdentifier extends ImmutableIdentifier implements GenericName
An identification of a CRS object which is both a `Identifier` and a `GenericName`. This class implements both interfaces in order to allow usage of the same instance either as an object name or alias. This flexibility make easier to uses object's names in two different models:

- In the ISO 19111 model, objects have a single name of type `RS_Identifier` and an arbitrary amount of aliases of type `GenericName`.
- In the GML model, objects have an arbitrary number of names of type `gml:CodeType`, but do not have any alias.

By using this `NamedIdentifier` class, users can declare supplemental object's names as aliases and have those names used in contexts where `Identifier` instances are required, like GML marshalling time.

## Name ↔ Identifier mapping

The `GenericName` attributes will be inferred from `Identifier` attributes as below:

- Tip: derived from the identifier code.
- Head: derived from the identifier code space if non-null. If there is no code space, then the scope is derived from the shortest authority's alternate titles, or the main title if there are no alternate titles. This policy exploits the ISO 19115 comment saying that citation alternate titles often contain abbreviation (for example "DCW" as an alternative title for Digital Chart of the World).

### Example

If the identifier attributes are `authority` = `new DefaultCitation("IOGP")`, `codeSpace` = `"EPSG"` and `code` = `"4326"`, then the name attributes will be `head` = `"EPSG"`, `tip` = `"4326"` and `toString()` = `"EPSG:4326"`. Note that the scope does not appear in the string representation of names.

## Immutability and thread safety

This class is immutable and thus inherently thread-safe if the `Citation` and `InternationalString` arguments given to the constructor are also immutable. It is caller's responsibility to ensure that those conditions hold, for example by invoking `DefaultCitation​.transitionTo(DefaultCitation​.State​.FINAL)` before passing the arguments to the constructor. Subclasses shall make sure that any overridden methods remain safe to call from multiple threads and do not change any public `NamedIdentifier` state.

Since:
  0.4
See Also:
  - `DefaultIdentifier`
  - `AbstractName`
  - `AbstractIdentifiedObject​.getName()`
  - Serialized Form

- ## Field Summary

  ### Fields inherited from class ImmutableIdentifier

  `DESCRIPTION_KEY`

  ### Fields inherited from interface Identifier

  `AUTHORITY_KEY, CODE_KEY`

  ### Fields inherited from interface ReferenceIdentifier

  `CODESPACE_KEY, VERSION_KEY`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `NamedIdentifier(Map<String,?> properties)`
  Constructs an identifier from the given properties.
  `NamedIdentifier(Citation authority, CharSequence code)`
  Constructs an identifier from an authority and code.
  `NamedIdentifier(Citation authority, String codeSpace, CharSequence code, String version, InternationalString description)`
  Constructs an identifier from an authority and localizable code, with an optional version number and description.
  `NamedIdentifier(ReferenceIdentifier identifier)`
  Creates a new identifier from the specified one.
  `NamedIdentifier(GenericName name)`
  Creates a new identifier from the specified name.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static NamedIdentifier`
  `castOrCopy(ReferenceIdentifier object)`
  Returns a SIS identifier implementation with the values of the given arbitrary implementation.
  `static NamedIdentifier`
  `castOrCopy(GenericName object)`
  Returns a SIS name implementation with the values of the given arbitrary implementation.
  `int`
  `compareTo(GenericName object)`
  Compares this name with the specified object for order.
  `int`
  `depth()`
  Returns the depth of this name within the namespace hierarchy.
  `boolean`
  `equals(Object object)`
  Compares this identifier with the specified object for equality.
  `List<? extends LocalName>`
  `getParsedNames()`
  Returns the sequence of local names making this generic name.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `LocalName`
  `head()`
  Returns the first element in the sequence of parsed names.
  `ScopedName`
  `push(GenericName scope)`
  Returns this name expanded with the specified scope.
  `NameSpace`
  `scope()`
  Returns the scope (name space) in which this name is local.
  `LocalName`
  `tip()`
  The last element in the sequence of parsed names.
  `GenericName`
  `toFullyQualifiedName()`
  Returns a view of this name as a fully-qualified name.
  `InternationalString`
  `toInternationalString()`
  Returns a local-dependent string representation of this generic name.
  `String`
  `toString()`
  Returns a string representation of this generic name.

  ### Methods inherited from class ImmutableIdentifier

  `formatTo, getAuthority, getCode, getCodeSpace, getDescription, getVersion`

  ### Methods inherited from class FormattableObject

  `print, toString, toWKT`

  ### Methods inherited from class Object

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

- ## Constructor Details

  - ### NamedIdentifier

    public NamedIdentifier(ReferenceIdentifier identifier)
    Creates a new identifier from the specified one. This is a copy constructor which get the code, codespace, authority, version and the description (if available) from the given identifier.

    If the given identifier implements the `GenericName` interface, then calls to `tip()`, `head()`, `scope()` and similar methods will delegate to that name.

    Parameters:
      `identifier` - the identifier to copy.
    See Also:
      - `castOrCopy(ReferenceIdentifier)`

  - ### NamedIdentifier

    public NamedIdentifier(GenericName name)
    Creates a new identifier from the specified name. This constructor infers the identifier attributes (code, codespace and authority) from the given name. Calls to name-related methods like `tip()`, `head()` and `scope()` will delegate to the given name.
    Parameters:
      `name` - the name to wrap.
    See Also:
      - `castOrCopy(GenericName)`

  - ### NamedIdentifier

    public NamedIdentifier(Map<String,?> properties) throws IllegalArgumentException
    Constructs an identifier from the given properties. The content of the properties map is used as described in the super-class constructor, with the addition of an optional `"name"` property.

    Recognized properties
    Property name | Value type | Returned by
    --- | --- | ---
    `"name"` | `GenericName` | (many)
    Defined in parent class (reminder)
    "code" | `String` | `ImmutableIdentifier.getCode()`
    "codespace" | `String` | `ImmutableIdentifier.getCodeSpace()`
    "authority" | `String` or `Citation` | `ImmutableIdentifier.getAuthority()`
    "version" | `String` | `ImmutableIdentifier.getVersion()`
    "description" | `String` or `InternationalString` | `ImmutableIdentifier.getDescription()`
    "locale" | `Locale` | (none)

    The "code" property is mandatory and all other properties are optional. If a `"name"` property is provided, then calls to name-related methods like `tip()`, `head()` and `scope()` will delegate to the given name.
    Parameters:
      `properties` - the properties to be given to this identifier.
    Throws:
      `InvalidParameterValueException` - if a property has an invalid value.
      `IllegalArgumentException` - if a property is invalid for some other reason.

  - ### NamedIdentifier

    public NamedIdentifier(Citation authority, CharSequence code)
    Constructs an identifier from an authority and code. This is a convenience constructor for commonly-used parameters.

    If the given code is an `InternationalString`, then the `code​.toString(Locale​.ROOT)` return value will be used for the `code` property, and the complete international string will be used for the `name` property.

    Parameters:
      `authority` - organization or party responsible for definition and maintenance of the code space or code, or `null` if not available.
      `code` - identifier code or name, optionally from a controlled list or pattern defined by the authority. The code cannot be null.

  - ### NamedIdentifier

    public NamedIdentifier(Citation authority, String codeSpace, CharSequence code, String version, InternationalString description)
    Constructs an identifier from an authority and localizable code, with an optional version number and description.

    If the given code is an `InternationalString`, then the `code​.toString(Locale​.ROOT)` return value will be used for the `code` property, and the complete international string will be used for the `name` property.

    Parameters:
      `authority` - organization or party responsible for definition and maintenance of the code space or code, or `null` if not available.
      `codeSpace` - name or identifier of the person or organization responsible for namespace, or `null` if not available. This is often an abbreviation of the authority name.
      `code` - identifier code or name, optionally from a controlled list or pattern defined by a code space. The code cannot be null.
      `version` - the version of the associated code space or code as specified by the code authority, or `null` if none.
      `description` - natural language description of the meaning of the code value, or `null` if none.

- ## Method Details

  - ### castOrCopy

    public static NamedIdentifier castOrCopy(ReferenceIdentifier object)
    Returns a SIS identifier implementation with the values of the given arbitrary implementation. This method performs the first applicable action in the following choices:
    - If the given object is `null`, then this method returns `null`.
    - Otherwise if the given object is already an instance of `NamedIdentifier`, then it is returned unchanged.
    - Otherwise a new `NamedIdentifier` instance is created using the copy constructor and returned. Note that this is a shallow copy operation, because the other metadata contained in the given object are not recursively copied.
    Parameters:
      `object` - the object to get as a SIS implementation, or `null` if none.
    Returns:
      a SIS implementation containing the values of the given object (may be the given object itself), or `null` if the argument was null.
    Since:
      1.0

  - ### castOrCopy

    public static NamedIdentifier castOrCopy(GenericName object)
    Returns a SIS name implementation with the values of the given arbitrary implementation. This method performs the first applicable action in the following choices:
    - If the given object is `null`, then this method returns `null`.
    - Otherwise if the given object is already an instance of `NamedIdentifier`, then it is returned unchanged.
    - Otherwise a new `NamedIdentifier` instance is created using the copy constructor and returned. Note that this is a shallow copy operation, because the other metadata contained in the given object are not recursively copied.
    Parameters:
      `object` - the object to get as a SIS implementation, or `null` if none.
    Returns:
      a SIS implementation containing the values of the given object (may be the given object itself), or `null` if the argument was null.
    Since:
      1.0

  - ### tip

    public LocalName tip()
    The last element in the sequence of parsed names. By default, this is the same value as the code provided as a local name.
    Specified by:
      `tip` in interface `GenericName`
    Returns:
      the last element in the list of parsed names.
    See Also:
      - `ImmutableIdentifier​.getCode()`

  - ### head

    public LocalName head()
    Returns the first element in the sequence of parsed names. By default, this is the same value as the code space provided as a local name.
    Specified by:
      `head` in interface `GenericName`
    Returns:
      the first element in the list of parsed names.
    See Also:
      - `scope()`
      - `ImmutableIdentifier​.getCodeSpace()`

  - ### scope

    public NameSpace scope()
    Returns the scope (name space) in which this name is local. By default, this is the same value as the `authority` provided as a name space.
    Specified by:
      `scope` in interface `GenericName`
    Returns:
      the scope of this name.
    See Also:
      - `head()`
      - `ImmutableIdentifier​.getAuthority()`

  - ### depth

    public int depth()
    Returns the depth of this name within the namespace hierarchy.
    Specified by:
      `depth` in interface `GenericName`
    Returns:
      the depth of this name.

  - ### getParsedNames

    public List<? extends LocalName> getParsedNames()
    Returns the sequence of local names making this generic name. The length of this sequence is the depth. It does not include the scope.
    Specified by:
      `getParsedNames` in interface `GenericName`
    Returns:
      the local names making this generic name, without the scope. Shall never be `null` neither empty.

  - ### push

    public ScopedName push(GenericName scope)
    Returns this name expanded with the specified scope. One may represent this operation as a concatenation of the specified `name` with `this`.
    Specified by:
      `push` in interface `GenericName`
    Parameters:
      `scope` - The name to use as prefix.
    Returns:
      a concatenation of the given scope with this name.

  - ### toFullyQualifiedName

    public GenericName toFullyQualifiedName()
    Returns a view of this name as a fully-qualified name.
    Specified by:
      `toFullyQualifiedName` in interface `GenericName`
    Returns:
      the fully-qualified name (never `null`).

  - ### toInternationalString

    public InternationalString toInternationalString()
    Returns a local-dependent string representation of this generic name. This string is similar to the one returned by `toString()` except that each element has been localized in the specified locale. If no international string is available, then this method returns an implementation mapping to `toString()` for all locales.
    Specified by:
      `toInternationalString` in interface `GenericName`
    Returns:
      a localizable string representation of this name.

  - ### toString

    public String toString()
    Returns a string representation of this generic name. This string representation is local-independent. It contains all elements listed by `getParsedNames()` separated by a namespace-dependent character (usually `:` or `/`).
    Specified by:
      `toString` in interface `GenericName`
    Overrides:
      `toString` in class `FormattableObject`
    Returns:
      a local-independent string representation of this generic name.
    See Also:
      - `IdentifiedObjects​.toString(Identifier)`

  - ### compareTo

    public int compareTo(GenericName object)
    Compares this name with the specified object for order. Returns a negative integer, zero, or a positive integer as this name lexicographically precedes, is equal to, or follows the specified object.
    Specified by:
      `compareTo` in interface `Comparable<GenericName>`
    Parameters:
      `object` - the object to compare with.
    Returns:
      -1 if this identifier precedes the given object, +1 if it follows it.

  - ### equals

    public boolean equals(Object object)
    Compares this identifier with the specified object for equality.
    Overrides:
      `equals` in class `ImmutableIdentifier`
    Parameters:
      `object` - the object to compare with this name.
    Returns:
      `true` if the given object is equal to this name.

  - ### hashCode

    public int hashCode()
    Returns a hash code value for this object.
    Overrides:
      `hashCode` in class `ImmutableIdentifier`