Package org.apache.felix.cm.impl

Class RankingComparator

java.lang.Object

org.apache.felix.cm.impl.RankingComparator

All Implemented Interfaces:

Comparator<org.osgi.framework.ServiceReference<?>>

public abstract class RankingComparator
extends Object
implements Comparator<org.osgi.framework.ServiceReference<?>>

The RankingComparator may be used to maintain sorted sets or to sort arrays such that the first element in the set or array is the one to use first and the last elements the one to use last.

Field Summary

Fields

Modifier and Type	Field	Description
static Comparator<org.osgi.framework.ServiceReference<?>>	CM_RANKING	Implements a comparator to sort arrays and sets according to the specification of the service.cmRanking property in the Configuration Admin specification.
static Comparator<org.osgi.framework.ServiceReference<?>>	SRV_RANKING	Implements a comparator to sort arrays and sets according to the specification of the service.ranking property.

Constructor Summary

Constructors

Constructor	Description
RankingComparator()

Method Summary

Modifier and Type	Method	Description
protected int	getInteger(org.osgi.framework.ServiceReference<?> sr, String property)
protected long	getLong(org.osgi.framework.ServiceReference<?> sr, String property)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

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

Field Details

SRV_RANKING

public static Comparator<org.osgi.framework.ServiceReference<?>> SRV_RANKING

Implements a comparator to sort arrays and sets according to the specification of the service.ranking property. This results in collections whose first element has the highest ranking and the last element has the lowest ranking. Thus the results of this comparator are as follows:

• < 0 if obj1 has higher ranking than obj2
• == 0 if obj1 and obj2 reference the same service
• > 0 if obj1 has lower ranking than obj2

CM_RANKING

public static Comparator<org.osgi.framework.ServiceReference<?>> CM_RANKING

Implements a comparator to sort arrays and sets according to the specification of the service.cmRanking property in the Configuration Admin specification. This results in collections where the first element has the lowest ranking value and the last element has the highest ranking value. Order amongst elements with the same ranking value is left undefined, however we order it by service id, lowest last. Thus the results of this comparator are as follows:

• < 0 if obj1 has lower ranking than obj2
• == 0 if obj1 and obj2 have the same ranking
• > 0 if obj1 has higher ranking than obj2

Constructor Details

RankingComparator

public RankingComparator()

Method Details

getInteger

protected int getInteger(org.osgi.framework.ServiceReference<?> sr,
 String property)

getLong

protected long getLong(org.osgi.framework.ServiceReference<?> sr,
 String property)