org.openide.util

Class Union2<First,Second>

java.lang.Object

org.openide.util.Union2<First,Second>

All Implemented Interfaces:

Serializable, Cloneable

public abstract class Union2<First,Second>
extends Object
implements Cloneable, Serializable

A union type which can contain one of two kinds of objects. Object.equals(java.lang.Object) and Object.hashCode() treat this as a container, not identical to the contained object, but the identity is based on the contained object. The union is serialiable if its contained object is. Object.toString() delegates to the contained object.

Since:

org.openide.util 7.1

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
abstract Union2<First,Second>	clone()
static <First,Second> Union2<First,Second>	createFirst(First first) Construct a union based on the first type.
static <First,Second> Union2<First,Second>	createSecond(Second second) Construct a union based on the second type.
abstract First	first() Retrieve the union member of the first type.
abstract boolean	hasFirst() Check if the union contains the first type.
abstract boolean	hasSecond() Check if the union contains the second type.
abstract Second	second() Retrieve the union member of the second type.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

first

public abstract First first()
                     throws IllegalArgumentException

Retrieve the union member of the first type.

Returns:

the object of the first type

Throws:

IllegalArgumentException - if the union really contains the second type

second

public abstract Second second()
                       throws IllegalArgumentException

Retrieve the union member of the second type.

Returns:

the object of the second type

Throws:

IllegalArgumentException - if the union really contains the first type

hasFirst

public abstract boolean hasFirst()

Check if the union contains the first type.

Returns:

true if it contains the first type, false if it contains the second type

hasSecond

public abstract boolean hasSecond()

Check if the union contains the second type.

Returns:

true if it contains the second type, false if it contains the first type

clone

public abstract Union2<First,Second> clone()

Overrides:

clone in class Object

createFirst

public static <First,Second> Union2<First,Second> createFirst(First first)

Construct a union based on the first type.

Parameters:

first - an object of the first type

Returns:

a union containing that object

createSecond

public static <First,Second> Union2<First,Second> createSecond(Second second)

Construct a union based on the second type.

Parameters:

second - an object of the second type

Returns:

a union containing that object