View Javadoc

1   /*
2    * Copyright 2005 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at 
7    * 
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software 
11   * distributed under the License is distributed on an "AS IS" BASIS, 
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
13   * See the License for the specific language governing permissions and 
14   * limitations under the License.
15   */
16  
17  
18  package org.apache.jdo.impl.enhancer.classfile;
19  import java.util.Stack;
20  
21  /***
22   * ClassMember is a common base class for ClassMethod and ClassField
23   */
24  abstract public class ClassMember implements VMConstants {
25  
26      /* public accessors */
27  
28      /***
29       * Is the member static?
30       */
31      final public boolean isStatic() {
32          return (access() & ACCStatic) != 0;
33      }
34  
35      /***
36       * Is the member final?
37       */
38      final public boolean isFinal() {
39          return (access() & ACCFinal) != 0;
40      }
41  
42      /***
43       * Turn on or off the final qualifier for the member.
44       */
45      public void setIsFinal(boolean newFinal) {
46          if (newFinal)
47              setAccess(access() | ACCFinal);
48          else
49              setAccess(access() & ~ACCFinal);
50      }
51  
52      /***
53       * Is the member private?
54       */
55      final public boolean isPrivate() {
56          return (access() & ACCPrivate) != 0;
57      }
58  
59      /***
60       * Is the member protected?
61       */
62      final public boolean isProtected() {
63          return (access() & ACCProtected) != 0;
64      }
65  
66      /***
67       * Is the member public?
68       */
69      final public boolean isPublic() {
70          return (access() & ACCPublic) != 0;
71      }
72  
73      /* These are expected to be implemented by subtypes */
74  
75      /***
76       * Return the access flags for the method - see VMConstants
77       */
78      abstract public int access();
79  
80      /***
81       * Set the access flags for the method - see VMConstants
82       */
83      abstract public void setAccess(int newAccess);
84  
85      /***
86       * Return the name of the member
87       */
88      abstract public ConstUtf8 name();
89  
90      /***
91       * Return the type signature of the method
92       */
93      abstract public ConstUtf8 signature();
94  
95      /***
96       * Return the attributes associated with the member
97       */
98      abstract public AttributeVector attributes();
99  
100     /***
101      * Compares this instance with another for structural equality.
102      */
103     //@olsen: added method
104     public boolean isEqual(Stack msg, Object obj) {
105         if (!(obj instanceof ClassMember)) {
106             msg.push("obj/obj.getClass() = "
107                      + (obj == null ? null : obj.getClass()));
108             msg.push("this.getClass() = "
109                      + this.getClass());
110             return false;
111         }
112         ClassMember other = (ClassMember)obj;
113 
114         return true;
115     }
116 }