Event


1   /*
2    * Created on 6-sep-2005
3    * This software is OSI Certified Open Source Software.
4    * OSI Certified is a certification mark of the Open Source Initiative. The
5    * license (Mozilla version 1.0) can be read at the MMBase site. See
6    * http://www.MMBase.org/license
7    */
8   package org.mmbase.core.event;
9   
10  import java.io.Serializable  ;
11  
12  import org.mmbase.module.core.MMBase;
13  
14  /**
15   * This class is the base class for all mmbase events
16   * 
17   * @author  Ernst Bunders
18   * @since   MMBase-1.8
19   * @version $Id: Event.java,v 1.8 2006/07/06 09:52:30 michiel Exp $
20   */
21  public abstract class Event implements Serializable  , org.mmbase.util.PublicCloneable {
22  
23  
24      public static final int TYPE_UNSPECIFIED = -1;
25      public static final int TYPE_NEW      = 0;
26      public static final int TYPE_CHANGE   = 1;
27      public static final int TYPE_DELETE   = 2;
28  
29      protected int    eventType = TYPE_UNSPECIFIED;
30      protected String   machine;
31  
32      /**
33       * Every event originates from a certain machine, which is identified by a String.
34       * If this equals {@link MMBase#getMachineName()} then this is a local event.
35       */
36      public String   getMachine() {
37          return machine;
38      }
39      public boolean isLocal() {
40          return MMBase.getMMBase().getMachineName().equals(machine);
41      }
42  
43  
44      /**
45       * Most events will come in certain 'types', default contants which are provided are {@link
46       * #TYPE_NEW}, {@link #TYPE_CHANGE} and {@link #TYPE_DELETE}.
47       */
48      public int getType() {
49          return eventType;
50      }
51  
52      /**
53       * @param machine The machine name. If <code>null</code> the local machine name is extracted from MMBase, using
54       *                {@link MMBase#getMachineName()}
55       */
56      public Event(String   machine, int type) {
57          this.machine =  machine == null ?
58              MMBase.getMMBase().getMachineName() :
59              machine;
60          this.eventType    = type;
61      }
62  
63      public Event(String   machine) {
64          this(machine, TYPE_UNSPECIFIED);
65      }
66  
67      public Object   clone(){
68          Object   clone = null;
69          try {
70              clone = super.clone();
71          } catch (CloneNotSupportedException   e) {}
72          return clone;
73      }
74  
75  }
76
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