ostore.introspect
Interface Distance

All Superinterfaces:

Comparable, QuickSerializable

All Known Implementing Classes:

Distance.InfiniteDistance, SimpleRealTime.Distance

public interface Distance

extends Comparable, QuickSerializable

Semantic distance between two objects. Distances must be comparable. Subclasses must handle INFINITY distance correctly.

Version:

$Id: Distance.java,v 1.4 2003/04/03 01:10:22 jeffpang Exp $

Author:

Jeff Pang

Nested Class Summary

static class

Distance.InfiniteDistance Special distance value representing infinity.

Field Summary

static Distance

INFINITY Distance representing infinite distance.

Method Summary

Distance	difference(Distance other)
boolean	equals(Object other)
Distance	pow(int power)
Distance	scale(double factor)
Distance	sum(Distance other)

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from interface ostore.util.QuickSerializable

serialize

Field Detail

INFINITY

public static final Distance INFINITY

Distance representing infinite distance.

Method Detail

equals

public boolean equals(Object other)

Overrides:

equals in class Object

Returns:

this == other

sum

public Distance sum(Distance other)

Returns:

this + other

difference

public Distance difference(Distance other)

Returns:

this - other

pow

public Distance pow(int power)

Returns:

this^pow

scale

public Distance scale(double factor)

Returns:

factor * this