org.openmdx.uses.java.lang
Class Enum

java.lang.Object
  org.openmdx.uses.java.lang.Enum

All Implemented Interfaces:

Serializable, Comparable

Direct Known Subclasses:

State, State.Interrogation, TimeUnit, TransactionAttribute

public abstract class Enum
extends Object
implements Comparable, Serializable

This is the common base class of all Java language enumeration types.

Since:

1.5

Version:

1.12, 06/08/04

Author:

Josh Bloch, Neal Gafter

See Also:

Serialized Form

Constructor Summary

protected	Enum()
protected	Enum(String name, int ordinal) Programmers cannot invoke this constructor.

Method Summary

protected Object	clone() Throws CloneNotSupportedException.
int	compareTo(Object o) Compares this enum with the specified object for order.
boolean	equals(Object other) Returns true if the specified object is equal to this enum constant.
Class	getDeclaringClass() Returns the Class object corresponding to this enum constant's enum type.
static Enum[]	getEnumConstants(Class enumType)
int	hashCode() Returns a hash code for this enum constant.
String	name() Returns the name of this enum constant, exactly as declared in its enum declaration.
int	ordinal() Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).
protected Object	readResolve()
String	toString() Returns the name of this enum constant, as contained in the declaration.
protected static Enum	valueOf(Class enumType, String name) Returns the enum constant of the specified enum type with the specified name.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Enum

protected Enum(String name,
               int ordinal)

Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations.

Parameters:

name - - The name of this enum constant, which is the identifier used to declare it.

ordinal - - The ordinal of this enumeration constant (its position in the enum declaration, where the initial constant is assigned an ordinal of zero).

Enum

protected Enum()

Method Detail

name

public final String name()

Returns the name of this enum constant, exactly as declared in its enum declaration. Most programmers should use the toString() method in preference to this one, as the toString method may return a more user-friendly name. This method is designed primarily for use in specialized situations where correctness depends on getting the exact name, which will not vary from release to release.

Returns:

the name of this enum constant

ordinal

public final int ordinal()

Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero). Most programmers will have no use for this method. It is designed for use by sophisticated enum-based data structures, such as EnumSet and EnumMap.

Returns:

the ordinal of this enumeration constant

toString

public String toString()

Returns the name of this enum constant, as contained in the declaration. This method may be overridden, though it typically isn't necessary or desirable. An enum type should override this method when a more "programmer-friendly" string form exists.

Overrides:

toString in class Object

Returns:

the name of this enum constant

equals

public final boolean equals(Object other)

Returns true if the specified object is equal to this enum constant.

Overrides:

equals in class Object

Parameters:

other - the object to be compared for equality with this object.

Returns:

true if the specified object is equal to this enum constant.

hashCode

public final int hashCode()

Returns a hash code for this enum constant.

Overrides:

hashCode in class Object

Returns:

a hash code for this enum constant.

clone

protected final Object clone()
                      throws CloneNotSupportedException

Throws CloneNotSupportedException. This guarantees that enums are never cloned, which is necessary to preserve their "singleton" status.

Overrides:

clone in class Object

Returns:

(never returns)

Throws:

CloneNotSupportedException

compareTo

public final int compareTo(Object o)

Compares this enum 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. Enum constants are only comparable to other enum constants of the same enum type. The natural order implemented by this method is the order in which the constants are declared.

Specified by:

compareTo in interface Comparable

getDeclaringClass

public final Class getDeclaringClass()

Returns the Class object corresponding to this enum constant's enum type. Two enum constants e1 and e2 are of the same enum type if and only if e1.getDeclaringClass() == e2.getDeclaringClass(). (The value returned by this method may differ from the one returned by the Object.getClass() method for enum constants with constant-specific class bodies.)

Returns:

the Class object corresponding to this enum constant's enum type

valueOf

protected static Enum valueOf(Class enumType,
                              String name)

Returns the enum constant of the specified enum type with the specified name. The name must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

enumType - the Class object of the enum type from which to return a constant

name - the name of the constant to return

Returns:

the enum constant of the specified enum type with the specified name

Throws:

IllegalArgumentException - if the specified enum type has no constant with the specified name, or the specified class object does not represent an enum type

NullPointerException - if enumType or name is null

ClassCastException - if enumType is not a subclass of Enum.

getEnumConstants

public static Enum[] getEnumConstants(Class enumType)

readResolve

protected Object readResolve()
                      throws ObjectStreamException

Throws:

ObjectStreamException