org.apache.felix.cm.impl
Class RankingComparator

java.lang.Object
  org.apache.felix.cm.impl.RankingComparator

All Implemented Interfaces:

java.util.Comparator

public abstract class RankingComparator
extends java.lang.Object
implements java.util.Comparator

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 elementis the one to use last.

Field Summary

static java.util.Comparator	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 java.util.Comparator	SRV_RANKING Implements a comparator to sort arrays and sets according to the specification of the service.ranking property.

Constructor Summary

RankingComparator()

Method Summary

protected long

getLong(org.osgi.framework.ServiceReference sr, java.lang.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

Field Detail

SRV_RANKING

public static java.util.Comparator 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 java.util.Comparator 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. 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 Detail

RankingComparator

public RankingComparator()

Method Detail

getLong

protected long getLong(org.osgi.framework.ServiceReference sr,
                       java.lang.String property)