Mutation


1   /*-
2    * See the file LICENSE for redistribution information.
3    *
4    * Copyright (c) 2002,2006 Oracle.  All rights reserved.
5    *
6    * $Id: Mutation.java,v 1.7 2006/10/30 21:14:31 bostic Exp $
7    */
8   
9   package com.sleepycat.persist.evolve;
10  
11  import java.io.Serializable  ;
12  
13  /**
14   * The base class for all mutations.
15   *
16   * @see com.sleepycat.persist.evolve Class Evolution
17   * @author Mark Hayes
18   */
19  public abstract class Mutation implements Serializable   {
20  
21      private static final long serialVersionUID = -8094431582953129268L;
22  
23      private String   className;
24      private int classVersion;
25      private String   fieldName;
26  
27      Mutation(String   className, int classVersion, String   fieldName) {
28          this.className = className;
29          this.classVersion = classVersion;
30          this.fieldName = fieldName;
31      }
32  
33      /**
34       * Returns the class to which this mutation applies.
35       */
36      public String   getClassName() {
37          return className;
38      }
39  
40      /**
41       * Returns the class version to which this mutation applies.
42       */
43      public int getClassVersion() {
44          return classVersion;
45      }
46  
47      /**
48       * Returns the field name to which this mutation applies, or null if this
49       * mutation applies to the class itself.
50       */
51      public String   getFieldName() {
52          return fieldName;
53      }
54  
55      /**
56       * Returns true if the class name, class version and field name are equal
57       * in this object and given object.
58       */
59      @Override  
60      public boolean equals(Object   other) {
61          if (other instanceof Mutation) {
62              Mutation o = (Mutation) other;
63              return className.equals(o.className) &&
64                     classVersion == o.classVersion &&
65                     ((fieldName != null) ? fieldName.equals(o.fieldName)
66                                          : (o.fieldName == null));
67          } else {
68              return false;
69          }
70      }
71  
72      @Override  
73      public int hashCode() {
74          return className.hashCode() +
75                 classVersion +
76                 ((fieldName != null) ? fieldName.hashCode() : 0);
77      }
78  
79      @Override  
80      public String   toString() {
81          return "Class: " + className + " Version: " + classVersion +
82                 ((fieldName != null) ? (" Field: " + fieldName) : "");
83      }
84  }
85
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