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Java > Open Source Codes > org > apache > bcel > generic > ObjectType


1 /*
2  * Copyright 2000-2004 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 package org.apache.bcel.generic;
18
19 import org.apache.bcel.Constants;
20 import org.apache.bcel.Repository;
21 import org.apache.bcel.classfile.JavaClass;
22
23 /**
24  * Denotes reference such as java.lang.String.
25  *
26  * @version $Id: ObjectType.java 386056 2006-03-15 11:31:56Z tcurdt $
27  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
28  */
29 public class ObjectType extends ReferenceType {
30
31     private String JavaDoc class_name; // Class name of type
32
33
34     /**
35      * @param class_name fully qualified class name, e.g. java.lang.String
36      */
37     public ObjectType(String JavaDoc class_name) {
38         super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";");
39         this.class_name = class_name.replace('/', '.');
40     }
41
42
43     /** @return name of referenced class
44      */
45     public String JavaDoc getClassName() {
46         return class_name;
47     }
48
49
50     /** @return a hash code value for the object.
51      */
52     public int hashCode() {
53         return class_name.hashCode();
54     }
55
56
57     /** @return true if both type objects refer to the same class.
58      */
59     public boolean equals( Object JavaDoc type ) {
60         return (type instanceof ObjectType)
61                 ? ((ObjectType) type).class_name.equals(class_name)
62                 : false;
63     }
64
65
66     /**
67      * If "this" doesn't reference a class, it references an interface
68      * or a non-existant entity.
69      * @deprecated this method returns an inaccurate result
70      * if the class or interface referenced cannot
71      * be found: use referencesClassExact() instead
72      */
73     public boolean referencesClass() {
74         try {
75             JavaClass jc = Repository.lookupClass(class_name);
76             return jc.isClass();
77         } catch (ClassNotFoundException JavaDoc e) {
78             return false;
79         }
80     }
81
82
83     /**
84      * If "this" doesn't reference an interface, it references a class
85      * or a non-existant entity.
86      * @deprecated this method returns an inaccurate result
87      * if the class or interface referenced cannot
88      * be found: use referencesInterfaceExact() instead
89      */
90     public boolean referencesInterface() {
91         try {
92             JavaClass jc = Repository.lookupClass(class_name);
93             return !jc.isClass();
94         } catch (ClassNotFoundException JavaDoc e) {
95             return false;
96         }
97     }
98
99
100     /**
101      * Return true if this type references a class,
102      * false if it references an interface.
103      * @return true if the type references a class, false if
104      * it references an interface
105      * @throws ClassNotFoundException if the class or interface
106      * referenced by this type can't be found
107      */
108     public boolean referencesClassExact() throws ClassNotFoundException JavaDoc {
109         JavaClass jc = Repository.lookupClass(class_name);
110         return jc.isClass();
111     }
112
113
114     /**
115      * Return true if this type references an interface,
116      * false if it references a class.
117      * @return true if the type references an interface, false if
118      * it references a class
119      * @throws ClassNotFoundException if the class or interface
120      * referenced by this type can't be found
121      */
122     public boolean referencesInterfaceExact() throws ClassNotFoundException JavaDoc {
123         JavaClass jc = Repository.lookupClass(class_name);
124         return !jc.isClass();
125     }
126
127
128     /**
129      * Return true if this type is a subclass of given ObjectType.
130      * @throws ClassNotFoundException if any of this class's superclasses
131      * can't be found
132      */
133     public boolean subclassOf( ObjectType superclass ) throws ClassNotFoundException JavaDoc {
134         if (this.referencesInterface() || superclass.referencesInterface()) {
135             return false;
136         }
137         return Repository.instanceOf(this.class_name, superclass.class_name);
138     }
139
140
141     /**
142      * Java Virtual Machine Specification edition 2, § 5.4.4 Access Control
143      * @throws ClassNotFoundException if the class referenced by this type
144      * can't be found
145      */
146     public boolean accessibleTo( ObjectType accessor ) throws ClassNotFoundException JavaDoc {
147         JavaClass jc = Repository.lookupClass(class_name);
148         if (jc.isPublic()) {
149             return true;
150         } else {
151             JavaClass acc = Repository.lookupClass(accessor.class_name);
152             return acc.getPackageName().equals(jc.getPackageName());
153         }
154     }
155 }
156
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