org.opengis.util

Class CodeList<E extends CodeList<E>>

Object

CodeList<E>

Type Parameters:

E - The type of this code list.

All Implemented Interfaces:

Serializable, Comparable<E>

Direct Known Subclasses:

AssociationType, AxisDirection, BandDefinition, CellGeometry, CharacterSet, Classification, Context, CoverageContentType, Datatype, DateType, DimensionNameType, EvaluationMethodType, GeometricObjectType, GeometryType, ImagingCondition, InitiativeType, KeywordType, MaintenanceFrequency, MediumFormat, MediumName, ObjectiveType, Obligation, OnLineFunction, OperationType, PixelInCell, PixelOrientation, PolarizationOrientation, PresentationForm, Priority, Progress, RangeMeaning, Restriction, Role, ScopeCode, Sequence, SpatialRepresentationType, TopicCategory, TopologyLevel, TransferFunctionType, Trigger, VerticalDatumType

@UML(identifier="CodeList",
     specification=ISO_19103)
public abstract class CodeList<E extends CodeList<E>>
extends Object
implements Comparable<E>, Serializable

Base class for all code lists. Subclasses shall provides a values() method which returns all CodeList element in an array of the appropriate class.

Code lists are extensible, i.e. invoking the valueOf(String) method in any subclass will automatically add the newly created CodeList element in the array to be returned by values().

Since:

1.0

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	CodeList.Filter Used by valueOf(Class, Filter) to select codes matching an arbitrary criterion.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CodeList(String name, Collection<E> values) Creates a new code list element and add it to the given collection.

Method Summary

Modifier and Type	Method and Description
int	compareTo(E other) Compares this code with the specified object for order.
boolean	equals(Object object) Compares the specified object with this code list for equality.
abstract E[]	family() Returns the list of codes of the same kind than this code.
String	identifier() Returns the identifier declared in the UML annotation, or null if none.
String	name() Returns the programmatic name of this code list constant.
String[]	names() Returns all the names of this code.
int	ordinal() Returns the ordinal of this code constant.
protected Object	readResolve() Resolves the code list to an unique instance after deserialization.
String	toString() Returns a string representation of this code list.
static <T extends CodeList<T>> T	valueOf(Class<T> codeType, CodeList.Filter filter) Returns the code of the given type that matches the given criterion, or returns a new one if none match it.
static <T extends CodeList<T>> T	valueOf(Class<T> codeType, String name) Returns the code of the given type that matches the given name, or returns a new one if none match it.

Methods inherited from class Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CodeList

protected CodeList(String name,
                   Collection<E> values)

Creates a new code list element and add it to the given collection. Subclasses will typically give a static reference to an ArrayList for the values argument. This list is used for values() method implementations.

Parameters:

name - The code name.

values - The collection to add the element to.

Method Detail

valueOf

public static <T extends CodeList<T>> T valueOf(Class<T> codeType,
                                                String name)

Returns the code of the given type that matches the given name, or returns a new one if none match it. More specifically, this methods returns the first element of the given class where name().equals(name) returned true. If no such element is found, then a new instance is created using the constructor expecting a single String argument.

Implementation note: The codeType class needs to be initialized before to invoke this method. This is usually the case when the caller is a static method of the codeType class. However in other situations, callers may need to initialize explicitely the given class.

Type Parameters:

T - The compile-time type given as the codeType parameter.

Parameters:

codeType - The type of code list.

name - The name of the code to obtain, or null.

Returns:

A code matching the given name, or null if the name is null.

Departure from OGC/ISO specification:
Provided by analogy with the methods in the Java Enum class.

valueOf

public static <T extends CodeList<T>> T valueOf(Class<T> codeType,
                                                CodeList.Filter filter)

Returns the code of the given type that matches the given criterion, or returns a new one if none match it. More specifically, this methods returns the first element (in declaration order) of the given class where filter.accept(code) returns true. If no such element is found, then there is a choice:

• If CodeList.Filter.codename() returns null, then this method returns null.
• Otherwise a new instance is created using the constructor expecting a single String argument, which is given the value returned by codename().

Type Parameters:

T - The compile-time type given as the codeType parameter.

Parameters:

codeType - The type of code list.

filter - The criterion for the code to obtain.

Returns:

A code matching the given criterion, or null if their is no match and CodeList.Filter.codename() returns null.

Since:

2.3

Departure from OGC/ISO specification:
Provided by analogy with the methods in the Java Enum class.

family

public abstract E[] family()

Returns the list of codes of the same kind than this code. This is similar to the static values() method provided in CodeList subclasses, except that family() does not require the class to be known at compile-time - provided that at leat one instance of the family is available. The static values() method has the opposite constraints (does not require a code instance, but the class needs to be known at compile time unless reflection is used).

Returns:

The codes of the same kind than this code.

Departure from OGC/ISO specification:
Provided by analogy with Enum.family(), which was defined in a initial draft of Java 5 before the final release.

names

public String[] names()

Returns all the names of this code. The returned array contains the following elements, with duplicated values and null values removed:

• The programmatic name
• The UML identifier
• The charset name (CharacterSet code list only)

Those names are typically equal except for the case (programmatic names are upper case while UML names are lower case) and special characters like '-'.

Returns:

All names of this code constant. This array is never null and never empty.

Since:

2.3

Departure from OGC/ISO specification:
Defined because each CodeList has at least two names, the Java programmatic name and the UML identifier, while some subclasses have additional names.

name

public final String name()

Returns the programmatic name of this code list constant. This is the name of the public static field which declare the code.

Returns:

The name of this code constant.

Departure from OGC/ISO specification:
Provided by analogy with the methods in the Java Enum class.

identifier

public String identifier()

Returns the identifier declared in the UML annotation, or null if none. The UML identifier shall be the ISO or OGC name for this code constant.

Returns:

The ISO/OGC identifier for this code constant, or null if none.

Since:

2.2

Departure from OGC/ISO specification:
Defined because each CodeList has a UML identifier in addition of the Java programmatic name.

ordinal

public final int ordinal()

Returns the ordinal of this code constant. This is its position in its elements declaration, where the initial constant is assigned an ordinal of zero.

Returns:

The position of this code constants in elements declaration.

Departure from OGC/ISO specification:
Provided by analogy with the methods in the Java Enum class.

compareTo

public final int compareTo(E other)

Compares this code with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

Code list constants are only comparable to other code list constants of the same type. The natural order implemented by this method is the order in which the constants are declared.

Specified by:

compareTo in interface Comparable<E extends CodeList<E>>

Parameters:

other - The code constant to compare with this code.

Returns:

A negative value if the given code is less than this code, a positive value if greater or 0 if equal.

equals

public final boolean equals(Object object)

Compares the specified object with this code list for equality. This method compares only ordinal values for consistency with the compareTo(CodeList) method. Ordinal values are unique for each code list element of the same class.

Overrides:

equals in class Object

Parameters:

object - The object to compare with this code.

Returns:

true if the given object is equals to this code.

Since:

2.2

toString

public String toString()

Returns a string representation of this code list.

Overrides:

toString in class Object

readResolve

protected Object readResolve()
                      throws ObjectStreamException

Resolves the code list to an unique instance after deserialization. The instance is resolved using its name only (not its ordinal).

Returns:

This code list as an unique instance.

Throws:

ObjectStreamException - if the deserialization failed.