org.deegree.commons.utils
Class Pair<T,U>

java.lang.Object
  org.deegree.commons.utils.Pair<T,U>

Type Parameters:

T - the first Object of the pair

U - the second Object of the pair

Direct Known Subclasses:

ComparablePair, DoublePair, JTSGeometryPair, StringPair

public class Pair<T,U>
extends java.lang.Object

Pair is a convenience class, which pairs two objects. For a pair of Strings see StringPair.

Version:

$Revision: 27230 $, $Date: 2010-10-13 12:39:51 +0200 (Mi, 13. Okt 2010) $

Author:

Rutger Bezema, last edited by: $Author: lbuesching $

Field Summary

T	first first value of the pair.
U	second second value of the pair.

Constructor Summary

Pair()
Create a pair with null objects.

Pair(T first, U second)

Method Summary

boolean	equals(java.lang.Object other)
T	getFirst()
U	getSecond()
int	hashCode() Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast.
boolean	hasNull()
boolean	isNull()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

first

public T first

first value of the pair.

second

public U second

second value of the pair.

Constructor Detail

Pair

public Pair(T first,
            U second)

Parameters:

first - value of the pair.

second - value of the pair.

Pair

public Pair()

Create a pair with null objects.

Method Detail

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast. It is created from field f as follows:

• boolean -- code = (f ? 0 : 1)
• byte, char, short, int -- code = (int)f
• long -- code = (int)(f ^ (f >>>32))
• float -- code = Float.floatToIntBits(f);
• double -- long l = Double.doubleToLongBits(f); code = (int)(l ^ (l >>> 32))
• all Objects, (where equals( ) calls equals( ) for this field) -- code = f.hashCode( )
• Array -- Apply above rules to each element

Combining the hash code(s) computed above: result = 37 * result + code;

Overrides:

hashCode in class java.lang.Object

Returns:

(int) ( result >>> 32 ) ^ (int) result;

See Also:

Object.hashCode()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hasNull

public boolean hasNull()

Returns:

true if either the first or the second value is null

isNull

public boolean isNull()

Returns:

true if the first and the second value are null

getFirst

public T getFirst()

getSecond

public U getSecond()