node.java

Rakiura JFern是一个非常轻型的带有模拟器的Petri网络框架

// This is copyrighted source file, part of Rakiura JFern package. 
// See the file LICENSE for copyright information and the terms and conditions
// for copying, distributing and modifications of Rakiura JFern package.
// Copyright (C) 1999-2002 by Mariusz Nowostawski and others  [http://www.rakiura.org]

package org.rakiura.cpn;

/**
 * Basic abstract implementation of the NetElement. This is the most
 * primitive abstract building block of the Net. 
 * 
 *<br><br>
 * Node.java<br>
 * Created: Mon Sep 25 11:02:54 2000<br>
 *
 *@author  <a href="[e-mail]">Mariusz Nowostawski</a>
 *@version 2.1.0 $Revision: 1.6 $
 *@since 1.0
 */
public abstract class Node implements NetElement {
  
  /**/
  private static long newID;
  /**/
  private String id;
  /**/
  private String name;


  
  /**
   * Creates new node.
   */
  public Node() {
    this.id = newUniqueID();
    this.name = "_" + id;
  }

  /**
   * Creates new node.
   *@param aName this node name.
   */
  public Node(final String aName) {
    this.id = newUniqueID();
    this.name = aName;
  }

  /**
   * Returns ID for this node.
   *@return ID for this node.
   */
  public String getID(){ 
    return this.id; 
  }

  /**
   * Sets the name of this node.
   *@return previous name of this node. */
  public String setName(String name){
    final String old = this.name;
    this.name = name;
    return old;
  }

  /** 
   * Returns the name of this node.
   *@return the name of this node. */
  public String getName(){
    return this.name;
  }

  /**
   * Generates a new unique identifier for this node.
   *@return new unique ID.
   */
  public static String newUniqueID() {
    final long id = newID;
    newID++; 
    checkMax();
    return "id"+id;
  }

  private static void checkMax() {
    if(newID == Long.MAX_VALUE) throw 
        new RuntimeException("Problem with the Unique Identifier. You have reached Long.MAX_VALUE limit. Congratulations!\n" +
                             "Send your application description to: [e-mail] and we will help.");
  }
    
} // Node
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