1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  import org.apache.bcel.Constants;
57  import org.apache.bcel.Repository;
58  import org.apache.bcel.classfile.JavaClass;
59  
60  /*** 
61   * Denotes reference such as java.lang.String.
62   *
63   * @version $Id: ObjectType.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $
64   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
65   */
66  public final class ObjectType extends ReferenceType {
67    private String class_name; // Class name of type
68  
69    /***
70     * @param class_name fully qualified class name, e.g. java.lang.String
71     */ 
72    public ObjectType(String class_name) {
73      super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";");
74      this.class_name = class_name.replace('/', '.');
75    }
76  
77    /*** @return name of referenced class
78     */
79    public String getClassName() { return class_name; }
80  
81    /*** @return a hash code value for the object.
82     */
83    public int hashCode()  { return class_name.hashCode(); }
84  
85    /*** @return true if both type objects refer to the same class.
86     */
87    public boolean equals(Object type) {
88      return (type instanceof ObjectType)?
89        ((ObjectType)type).class_name.equals(class_name) : false;
90    }
91  
92    /***
93     * If "this" doesn't reference a class, it references an interface
94     * or a non-existant entity.
95     */
96    public boolean referencesClass(){
97      JavaClass jc = Repository.lookupClass(class_name);
98      if (jc == null)
99        return false;
100     else
101       return jc.isClass();
102   }
103   
104   /***
105    * If "this" doesn't reference an interface, it references a class
106    * or a non-existant entity.
107    */
108   public boolean referencesInterface(){
109     JavaClass jc = Repository.lookupClass(class_name);
110     if (jc == null)
111       return false;
112     else
113       return !jc.isClass();
114   }
115 
116   public boolean subclassOf(ObjectType superclass){
117     if (this.referencesInterface() || superclass.referencesInterface())
118       return false;
119 
120     return Repository.instanceOf(this.class_name, superclass.class_name);
121   }
122 
123   /***
124    * Java Virtual Machine Specification edition 2, § 5.4.4 Access Control
125    */
126   public boolean accessibleTo(ObjectType accessor) {
127     JavaClass jc = Repository.lookupClass(class_name);
128 
129     if(jc.isPublic()) {
130       return true;
131     } else {
132       JavaClass acc = Repository.lookupClass(accessor.class_name);
133       return acc.getPackageName().equals(jc.getPackageName());
134     }
135   }
136 }
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