jvanzyl
2a14dba733
better. PR: Obtained from: Submitted by: Reviewed by: git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/sandbox/graph/trunk@144579 13f79535-47bb-0310-9956-ffa450edef68
131 lines
4.2 KiB
Java
131 lines
4.2 KiB
Java
package org.apache.commons.graph;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import org.apache.commons.graph.visitor.Visitor;
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/**
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* Describes an edge between two vertices of a graph, i.e. a relation between
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* two arbitrary vertices.
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*
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* @version $Id: Edge.java,v 1.2 2001/11/29 14:17:33 jvanzyl Exp $
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* @author <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
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*/
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public class Edge implements Cloneable, Constants, java.io.Serializable {
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private int ident; // unique number, i.e. identifier
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private static int counter; // produce default numbers
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/**
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* Create edge.
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*/
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public Edge() {
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ident = counter++;
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}
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/**
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* @return ident, i.e. identifier of this node
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*/
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public final int getIdent() { return ident; }
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/**
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* @return number of created edges
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*/
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public static final int getCounter() { return counter; }
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/**
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* @return String representation.
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*/
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public String toString() {
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return toString(PLAIN);
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}
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/**
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* @param verbose toggle output format
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* @return String representation.
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*/
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public String toString(int verbose) {
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if((verbose == TALKATIVE) || (verbose == V_TALKATIVE))
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return "Edge(" + ident + ")";
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return "";
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}
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/**
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* Access for visitor patterns
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*/
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public void accept(Visitor v) { v.discoverEdge(this); }
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/**
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* @return deep copy
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*/
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public Edge copy() {
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try {
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return (Edge)clone();
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} catch(CloneNotSupportedException e) {}
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return null;
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}
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/** Check for equality.
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*/
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public boolean equals(Object o) {
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if(!(o instanceof Edge))
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return false;
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Edge e = (Edge)o;
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return e.ident == ident;
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}
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}
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