Package de.dlr.proseo.ui.gui.service

Klasse MapComparator

java.lang.Object

de.dlr.proseo.ui.gui.service.MapComparator

Alle implementierten Schnittstellen:

Comparator<Object>

public class MapComparator
extends Object
implements Comparator<Object>

A class for comparing HashMap objects based on one or two specified keys

Autor:

Ernst Melchinger

Feldübersicht

Felder

Modifizierer und Typ	Feld	Beschreibung
(Package privat) String	key	the first key to compare
(Package privat) String	key2	the second key to compare
(Package privat) Boolean	up	the sorting order

Konstruktorübersicht

Konstruktoren

Konstruktor	Beschreibung
MapComparator(String key, Boolean up)	Constructor that takes a key and a boolean argument for the sorting order
MapComparator(String key, String key2, Boolean up)	Constructor that takes two keys and a boolean argument for the sorting order

Methodenübersicht

Modifizierer und Typ	Methode	Beschreibung
int	compare(Object object1, Object object2)	Compares two objects, checks whether they are instances of HashMap and then extracts the values associated with the specified keys from each HashMap.

Von Klasse geerbte Methoden java.lang.Object

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

Von Schnittstelle geerbte Methoden java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Felddetails

key

String key

the first key to compare

key2

String key2

the second key to compare

up

Boolean up

the sorting order

Konstruktordetails

MapComparator

public MapComparator(String key,
 Boolean up)

Constructor that takes a key and a boolean argument for the sorting order

Parameter:

key - the key to look for in compared hash maps

up - true, if the comparison is to be made in ascending order, false otherwise

MapComparator

public MapComparator(String key,
 String key2,
 Boolean up)

Constructor that takes two keys and a boolean argument for the sorting order

Parameter:

key - the key to look for in compared hash maps

key2 - the second key to look for

up - true, if the comparison is to be made in ascending order, false otherwise

Methodendetails

compare

public int compare(Object object1,
 Object object2)

Compares two objects, checks whether they are instances of HashMap and then extracts the values associated with the specified keys from each HashMap.

Angegeben von:

compare in Schnittstelle Comparator<Object>

Parameter:

object1 - the first object (HashMap) to compare

object2 - the second object (HashMap) to compare

Gibt zurück:

a negative value if the first object should be placed before the second object, a positive value if the first object should be placed after the second object, or zero if the objects are either not HashMaps, or null, or their keys neither integer nor string, or considered equal in terms of sorting