com.phoenixst.plexus.util
Class DefaultSimpleEdge

java.lang.Object
  com.phoenixst.plexus.util.DefaultEdge
      com.phoenixst.plexus.util.DefaultSimpleEdge

All Implemented Interfaces:

Graph.Edge, Serializable

public class DefaultSimpleEdge
extends DefaultEdge

A default Graph.Edge implementation for a simple graph in which the user-defined object must be null. This class should only be used by Graphs which create edges lazily on demand. Otherwise, use DefaultEdge or DefaultObjectEdge instead. Reference equality is not used by equals( Object ).

Since:

1.0

Version:

$Revision: 1.10 $

Author:

Ray A. Conner

See Also:

Serialized Form

Constructor Summary

DefaultSimpleEdge(Object tail, Object head, boolean directed)
Creates a new DefaultSimpleEdge.

Method Summary

boolean	equals(Object object) Returns whether or not some other object is equal to this one.
int	hashCode() Returns the hash code for this Graph.Edge.

Methods inherited from class com.phoenixst.plexus.util.DefaultEdge

getHead, getOtherEndpoint, getTail, getUserObject, isDirected, setUserObject, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultSimpleEdge

public DefaultSimpleEdge(Object tail,
                         Object head,
                         boolean directed)

Creates a new DefaultSimpleEdge.

Method Detail

equals

public boolean equals(Object object)

Description copied from interface: Graph.Edge

Returns whether or not some other object is equal to this one. It is vitally important that two Graph.Edges only be .equals() when they refer to the same actual edge in the graph. Which edge this is does not change when the contained user-defined object changes. In a multigraph, the endpoints and contained user-defined object are generally not sufficiently distinguishing characteristics. Accepting the default implementation from Object, which uses reference equality, should be preferred unless Graph.Edges are lazily created on demand.

Description copied from class: Object

Specified by:

equals in interface Graph.Edge

Overrides:

equals in class Object

hashCode

public int hashCode()

Description copied from interface: Graph.Edge

Returns the hash code for this Graph.Edge. Since it is mutable, the contained user-defined object should not be used when computing the hash code.

Description copied from class: Object

Specified by:

hashCode in interface Graph.Edge

Overrides:

hashCode in class Object