Object
- AbstractMetadata
- - ModifiableMetadata
  - - ISOMetadata
    - - DefaultIdentifier

All Implemented Interfaces:

Serializable, Emptiable, LenientComparable, IdentifiedObject, Identifier
```
@TitleProperty(name="code")
public class DefaultIdentifier
extends ISOMetadata
implements Identifier
```
Value uniquely identifying an object within a namespace. The following property is mandatory in a well-formed metadata according ISO 19115:
MD_Identifier └─code…………… Alphanumeric value identifying an instance in the namespace.
One or more Identifier instances can be associated to some metadata objects like operation, platform, instrument, event, processing, source, image description, geographic description and more.
Referencing objects like coordinate system axis, geodetic datum, geographic CRS and more rather use the ImmutableIdentifier implementation, which is a class unrelated to the usual org.apache.metadata hierarchy because of the immutable nature of referencing objects.

Text, URN and XML representations
The XML representation of DefaultIdentifier is as the following example:
```
<mcc:MD_Identifier
  <mcc:code>
    <gco:CharacterString>4326</gco:CharacterString>
  </mcc:code>
  <mcc:authority>
    <cit:CI_Citation>
      <cit:title>
        <gco:CharacterString>EPSG</gco:CharacterString>
      </cit:title>
    </cit:CI_Citation>
  </mcc:authority>
</mcc:MD_Identifier>
```
Limitations
- Instances of this class are not synchronized for multi-threading. Synchronization, if needed, is caller's responsibility.
- Serialized objects of this class are not guaranteed to be compatible with future Apache SIS releases. Serialization support is appropriate for short term storage or RMI between applications running the same version of Apache SIS. For long term storage, use XML instead.
Since:

0.3

See Also:

ImmutableIdentifier, IdentifiedObjects.toURN(Class, Identifier), Serialized Form

Defined in the sis-metadata module

Nested Class Summary
- Nested classes/interfaces inherited from class ModifiableMetadata
  ModifiableMetadata.State

Field Summary
- Fields inherited from class ISOMetadata
  identifiers
- Fields inherited from interface Identifier
  AUTHORITY_KEY, CODE_KEY

Constructor Summary

Constructors
Constructor	Description
`DefaultIdentifier()`	Construct an initially empty identifier.
`DefaultIdentifier(String code)`	Creates an identifier initialized to the given code.
`DefaultIdentifier(String codeSpace, String code, String version)`	Creates a new identifier initialized to the given code, code space and version number.
`DefaultIdentifier(Citation authority, String code)`	Creates an identifier initialized to the given authority and code.
`DefaultIdentifier(Identifier object)`	Constructs a new instance initialized with the values from the specified metadata object.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static DefaultIdentifier`	`castOrCopy(Identifier object)`	Returns a SIS metadata implementation with the values of the given arbitrary implementation.
`Citation`	`getAuthority()`	Returns the person or party responsible for maintenance of the namespace.
`String`	`getCode()`	Returns the alphanumeric value identifying an instance in the namespace.
`String`	`getCodeSpace()`	Returns the identifier or namespace in which the code is valid.
`InternationalString`	`getDescription()`	Returns the natural language description of the meaning of the code value.
`String`	`getVersion()`	Returns the version identifier for the namespace, as specified by the code authority.
`void`	`setAuthority(Citation newValue)`	Sets the person or party responsible for maintenance of the namespace.
`void`	`setCode(String newValue)`	Sets the alphanumeric value identifying an instance in the namespace.
`void`	`setCodeSpace(String newValue)`	Sets the identifier or namespace in which the code is valid.
`void`	`setDescription(InternationalString newValue)`	Sets the natural language description of the meaning of the code value.
`void`	`setVersion(String newValue)`	Sets the version identifier for the namespace.

Methods inherited from class ISOMetadata
getIdentifier, getIdentifierMap, getIdentifiers, getStandard, setIdentifier, transitionTo

Methods inherited from class ModifiableMetadata
checkWritePermission, checkWritePermission, collectionType, copyCollection, copyList, copyMap, copySet, freeze, isModifiable, nonNullCollection, nonNullList, nonNullMap, nonNullSet, singleton, state, unmodifiable, writeCollection, writeList, writeMap, writeSet

Methods inherited from class AbstractMetadata
asMap, asTreeTable, equals, equals, getInterface, hashCode, isEmpty, prune, toString

Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DefaultIdentifier
```
public DefaultIdentifier()
```
    Construct an initially empty identifier.
  - DefaultIdentifier
```
public DefaultIdentifier(String code)
```
    Creates an identifier initialized to the given code.
    
    Parameters:
    
    code - the alphanumeric value identifying an instance in the namespace, or null if none.
  - DefaultIdentifier
```
public DefaultIdentifier(String codeSpace,
                         String code,
                         String version)
```
    Creates a new identifier initialized to the given code, code space and version number.
    
    Parameters:
    
    codeSpace - identifier or namespace in which the code is valid, or null if not available.
    
    code - alphanumeric value identifying an instance in the namespace, or null if none.
    
    version - the version identifier for the namespace as specified by the code authority, or null if none.
    
    Since:
    
    1.0
  - DefaultIdentifier
```
public DefaultIdentifier(Citation authority,
                         String code)
```
    Creates an identifier initialized to the given authority and code. This constructor automatically initializes the code space to a value inferred from the given authority, if a suitable value can be found. This constructor proceeds by searching for the first suitable property in the following list:
    
    The value of IdentifierSpace.getName().
    
    A citation identifier which is a valid unicode identifier.
    
    Only if the citation has no identifier, a citation title or alternate title which is a valid unicode identifier.
    Parameters:
    
    authority - the the person or party responsible for maintenance of the namespace, or null if none.
    
    code - the alphanumeric value identifying an instance in the namespace, or null if none.
    
    See Also:
    
    Citations.toCodeSpace(Citation)
  - DefaultIdentifier
```
public DefaultIdentifier(Identifier object)
```
    Constructs a new instance initialized with the values from the specified metadata object. This is a shallow copy constructor, since the other metadata contained in the given object are not recursively copied.
    
    Parameters:
    
    object - the metadata to copy values from, or null if none.
    
    See Also:
    
    castOrCopy(Identifier)
- Method Detail
  - castOrCopy
```
public static DefaultIdentifier castOrCopy(Identifier object)
```
    Returns a SIS metadata 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 DefaultIdentifier, then it is returned unchanged.
    
    Otherwise a new DefaultIdentifier instance is created using the copy constructor and returned. Note that this is a shallow copy operation, since 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.
  - getAuthority
```
public Citation getAuthority()
```
    Returns the person or party responsible for maintenance of the namespace. The organization's abbreviation is often the same than this identifier code space, but not necessarily.
    
    Specified by:
    
    getAuthority in interface Identifier
    
    Returns:
    
    person or party responsible for maintenance of the namespace, or null if not available.
  - setAuthority
```
public void setAuthority(Citation newValue)
```
    Sets the person or party responsible for maintenance of the namespace.
    
    Parameters:
    
    newValue - the new authority.
  - getCode
```
public String getCode()
```
    Returns the alphanumeric value identifying an instance in the namespace. The code is optionally from a controlled list or pattern.
    Example: "4326".
    The code is mandatory according ISO specification, but this DefaultIdentifier implementation does not enforce this restriction.
    
    Specified by:
    
    getCode in interface Identifier
    
    Returns:
    
    value identifying an instance in the namespace.
  - setCode
```
public void setCode(String newValue)
```
    Sets the alphanumeric value identifying an instance in the namespace. Should avoid characters that are not legal in URLs.
    
    Parameters:
    
    newValue - the new code, or null.
  - getCodeSpace
```
@UML(identifier="codeSpace",
     obligation=OPTIONAL,
     specification=ISO_19115)
public String getCodeSpace()
```
    Returns the identifier or namespace in which the code is valid. This is often the authority's abbreviation, but not necessarily.
    Example: "EPSG".
    
    Returns:
    
    the identifier or namespace in which the code is valid, or null if none.
    
    Since:
    
    0.5
  - setCodeSpace
```
public void setCodeSpace(String newValue)
```
    Sets the identifier or namespace in which the code is valid.
    
    Parameters:
    
    newValue - the new code space, or null if none.
    
    Since:
    
    0.5
  - getVersion
```
@UML(identifier="version",
     obligation=OPTIONAL,
     specification=ISO_19115)
public String getVersion()
```
    Returns the version identifier for the namespace, as specified by the code authority. This version is included only when the code uses versions. When appropriate, the edition is identified by the effective date, coded using ISO 8601 date format.
    Example: the version of the underlying EPSG database.
    
    Returns:
    
    the version identifier for the namespace, or null if none.
  - setVersion
```
public void setVersion(String newValue)
```
    Sets the version identifier for the namespace.
    
    Parameters:
    
    newValue - the new version, or null if none.
  - getDescription
```
@UML(identifier="description",
     obligation=OPTIONAL,
     specification=ISO_19115)
public InternationalString getDescription()
```
    Returns the natural language description of the meaning of the code value.
    Example: "World Geodetic System 1984".
    
    Returns:
    
    the natural language description, or null if none.
    
    Since:
    
    0.5
  - setDescription
```
public void setDescription(InternationalString newValue)
```
    Sets the natural language description of the meaning of the code value.
    
    Parameters:
    
    newValue - the new natural language description, or null if none.
    
    Since:
    
    0.5

Class DefaultIdentifier

Nested Class Summary

Nested classes/interfaces inherited from class ModifiableMetadata

Field Summary

Fields inherited from class ISOMetadata

Fields inherited from interface Identifier

Constructor Summary

Method Summary

Methods inherited from class ISOMetadata

Methods inherited from class ModifiableMetadata

Methods inherited from class AbstractMetadata

Methods inherited from class Object

Constructor Detail

DefaultIdentifier

DefaultIdentifier

DefaultIdentifier

DefaultIdentifier

DefaultIdentifier

Method Detail

castOrCopy

getAuthority

setAuthority

getCode

setCode

getCodeSpace

setCodeSpace

getVersion

setVersion

getDescription

setDescription