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Java > Open Source Codes > com > vladium > jcd > cls > attribute > InnerClassesAttribute_info


1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
2  *
3  * This program and the accompanying materials are made available under
4  * the terms of the Common Public License v1.0 which accompanies this distribution,
5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
6  *
7  * $Id: InnerClassesAttribute_info.java,v 1.1.1.1 2004/05/09 16:57:48 vlad_r Exp $
8  */
9 package com.vladium.jcd.cls.attribute;
10
11 import java.io.IOException JavaDoc;
12 import java.util.ArrayList JavaDoc;
13 import java.util.List JavaDoc;
14
15 import com.vladium.jcd.lib.UDataInputStream;
16 import com.vladium.jcd.lib.UDataOutputStream;
17
18 // ----------------------------------------------------------------------------
19 /**
20  * @author Vlad Roubtsov, (C) 2003
21  */
22 public
23 final class InnerClassesAttribute_info extends Attribute_info
24 {
25     // public: ................................................................
26
27     // ACCESSORS:
28
29     public boolean makesClassNested (final int class_index, final int [] nestedAccessFlags)
30     {
31         if (class_index > 0)
32         {
33             // TODO: avoid linear loop by keeping all class indices in a bitset
34
35             for (int i = 0, iLimit = size (); i < iLimit; ++ i)
36             {
37                 final InnerClass_info info = get (i);
38                 
39                 if (info.m_inner_class_index == class_index)
40                 {
41                     nestedAccessFlags [0] = info.m_inner_access_flags;
42                     return true;
43                 }
44             }
45         }
46         
47         return false;
48     }
49     
50     /**
51      * Returns {@link InnerClass_info} descriptor at a given offset.
52      *
53      * @param offset inner class entry offset [must be in [0, size()) range;
54      * input not checked]
55      * @return InnerClass_info descriptor [never null]
56      *
57      * @throws IndexOutOfBoundsException if 'offset' is outside of valid range
58      */
59     public final InnerClass_info get (final int offset)
60     {
61         return (InnerClass_info) m_classes.get (offset);
62     }
63     
64     /**
65      * Returns the number of descriptors in this collection [can be 0].
66      */
67     public final int size ()
68     {
69         return m_classes.size ();
70     }
71     
72     public final long length ()
73     {
74         return 8 + (m_classes.size () << 3); // use size() if class becomes non-final
75 }
76     
77     // Visitor:
78
79     public void accept (final IAttributeVisitor visitor, final Object JavaDoc ctx)
80     {
81         visitor.visit (this, ctx);
82     }
83     
84     public String JavaDoc toString ()
85     {
86         final StringBuffer JavaDoc s = new StringBuffer JavaDoc ("InnerClassesAttribute_info: [attribute_name_index = " + m_name_index + ", attribute_length = " + length () + "]\n");
87
88         for (int l = 0; l < size (); ++ l)
89         {
90             s.append (" " + get (l));
91             s.append ("\n"); // TODO: proper EOL const
92 }
93         
94         return s.toString ();
95     }
96     
97     // Cloneable:
98
99     /**
100      * Performs a deep copy.
101      */
102     public Object JavaDoc clone ()
103     {
104         final InnerClassesAttribute_info _clone = (InnerClassesAttribute_info) super.clone ();
105         
106         final List JavaDoc/* InnerClass_info */ classes = m_classes;
107         
108         // do deep copy:
109 final int class_count = classes.size (); // use size() if class becomes non-final
110 _clone.m_classes = new ArrayList JavaDoc (class_count);
111         for (int e = 0; e < class_count; ++ e)
112         {
113             _clone.m_classes.add (((InnerClass_info) classes.get (e)).clone ());
114         }
115         
116         return _clone;
117     }
118
119     // IClassFormatOutput:
120
121     public void writeInClassFormat (final UDataOutputStream out) throws IOException JavaDoc
122     {
123         super.writeInClassFormat (out);
124         
125         final List JavaDoc/* InnerClass_info */ classes = m_classes;
126         
127         final int class_count = classes.size (); // use size() if class becomes non-final
128 out.writeU2 (class_count);
129         
130         for (int l = 0; l < class_count; ++ l)
131         {
132             ((InnerClass_info) classes.get (l)).writeInClassFormat (out);
133         }
134     }
135     
136     // protected: .............................................................
137
138     // package: ...............................................................
139
140
141     InnerClassesAttribute_info (final int attribute_name_index, final long attribute_length,
142                                 final UDataInputStream bytes)
143         throws IOException JavaDoc
144     {
145         super (attribute_name_index, attribute_length);
146         
147         final int class_count = bytes.readU2 ();
148         final List JavaDoc/* InnerClass_info */ classes = new ArrayList JavaDoc (class_count);
149         
150         for (int i = 0; i < class_count; ++ i)
151         {
152             classes.add (new InnerClass_info (bytes));
153         }
154         
155         m_classes = classes;
156     }
157     
158     // private: ...............................................................
159
160     
161     private List JavaDoc/* InnerClass_info */ m_classes; // never null
162
163 } // end of class
164 // ----------------------------------------------------------------------------
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