Union2 (Base Utilities API)

java.lang.Object
- org.openide.util.Union2<First,Second>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable
```
public abstract class Union2<First,Second>
extends java.lang.Object
implements java.lang.Cloneable, java.io.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

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	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 java.lang.IllegalArgumentException
```
    Retrieve the union member of the first type.
    
    Returns:
    
    the object of the first type
    
    Throws:
    
    java.lang.IllegalArgumentException - if the union really contains the second type
  - second
```
public abstract Second second()
                       throws java.lang.IllegalArgumentException
```
    Retrieve the union member of the second type.
    
    Returns:
    
    the object of the second type
    
    Throws:
    
    java.lang.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 java.lang.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

Class Union2<First,Second>

Method Summary

Methods inherited from class java.lang.Object

Method Detail

first

second

hasFirst

hasSecond

clone

createFirst

createSecond