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: AttributeCollection.java,v 1.1.1.1 2004/05/09 16:57:44 vlad_r Exp $
8 */
9package com.vladium.jcd.cls;
10
11import java.io.IOException;
12import java.util.ArrayList;
13import java.util.List;
14
15import com.vladium.jcd.cls.attribute.*;
16import com.vladium.jcd.lib.UDataOutputStream;
17import com.vladium.util.asserts.$assert;
18
19// ----------------------------------------------------------------------------
20/**
21 * @author (C) 2001, Vlad Roubtsov
22 */
23final class AttributeCollection implements IAttributeCollection
24{
25    // public: ................................................................
26
27    // TODO: extend ItemCollection into all XXXCollection classes ?
28
29
30    // ACCESSORS:
31
32    public final Attribute_info get (final int offset)
33    {
34        return (Attribute_info) m_attributes.get (offset);
35    }
36
37    public final boolean hasSynthetic ()
38    {
39        return m_syntheticRefCount > 0;
40    }
41
42    public final boolean hasBridge ()
43    {
44        return m_bridgeRefCount > 0;
45    }
46
47    public final InnerClassesAttribute_info getInnerClassesAttribute ()
48    {
49        final int innerClassesAttributeOffset = m_innerClassesAttributeOffset;
50        if (innerClassesAttributeOffset < 0)
51            return null;
52        else
53            return (InnerClassesAttribute_info) get (innerClassesAttributeOffset);
54    }
55
56    public final int size ()
57    {
58        return m_attributes.size ();
59    }
60
61    public final long length ()
62    {
63        // TODO: cache?
64
65        long result = 2;
66
67        int _attributes_count = m_attributes.size (); // use size() if this class becomes non-final
68        for (int i = 0; i < _attributes_count; i++) result += get (i).length ();
69
70        return result;
71    }
72
73    // Cloneable:
74
75    /**
76     * Performs a deep copy.
77     */
78    public Object clone ()
79    {
80        try
81        {
82            final AttributeCollection _clone = (AttributeCollection) super.clone ();
83
84            // deep clone:
85
86            final int attributes_count = m_attributes.size (); // use size() if this class becomes non-final
87            _clone.m_attributes = new ArrayList (attributes_count);
88            for (int a = 0; a < attributes_count; ++ a)
89            {
90                _clone.m_attributes.add (((Attribute_info) m_attributes.get (a)).clone ());
91            }
92
93            return _clone;
94        }
95        catch (CloneNotSupportedException e)
96        {
97            throw new InternalError (e.toString ());
98        }
99    }
100
101    // IClassFormatOutput:
102
103    public void writeInClassFormat (final UDataOutputStream out) throws IOException
104    {
105        int attributes_count = size ();
106        out.writeU2 (attributes_count);
107
108        for (int i = 0; i < attributes_count; i++)
109        {
110            get (i).writeInClassFormat (out);
111        }
112    }
113
114    // Visitor:
115
116    public void accept (final IClassDefVisitor visitor, final Object ctx)
117    {
118        visitor.visit (this, ctx);
119    }
120
121
122    // MUTATORS:
123
124    public int add (final Attribute_info attribute)
125    {
126        final List/* Attribute_info */ attributes = m_attributes;
127
128        final int result = attributes.size ();
129        attributes.add (attribute);
130
131        if (attribute instanceof SyntheticAttribute_info)
132            ++ m_syntheticRefCount;
133        else if (attribute instanceof InnerClassesAttribute_info)
134        {
135            if (m_innerClassesAttributeOffset >= 0)
136                throw new IllegalArgumentException ("this attribute collection already has an InnerClasses attribute");
137
138            m_innerClassesAttributeOffset = result;
139        }
140        else if (attribute instanceof BridgeAttribute_info)
141            ++ m_bridgeRefCount;
142
143        if (DISALLOW_MULTIPLE_SYNTHETIC_ATTRIBUTES && $assert.ENABLED)
144            $assert.ASSERT (m_syntheticRefCount >= 0 && m_syntheticRefCount <= 1,
145            "bad synthetic attribute count: " + m_syntheticRefCount);
146
147        return result;
148    }
149
150    public Attribute_info set (final int offset, final Attribute_info attribute)
151    {
152        final Attribute_info result = (Attribute_info) m_attributes.set (offset, attribute);
153
154        if (result instanceof SyntheticAttribute_info)
155            -- m_syntheticRefCount;
156        else if (result instanceof InnerClassesAttribute_info)
157            m_innerClassesAttributeOffset = -1;
158        else if (result instanceof BridgeAttribute_info)
159            -- m_bridgeRefCount;
160
161        if (attribute instanceof SyntheticAttribute_info)
162            ++ m_syntheticRefCount;
163        else if (attribute instanceof InnerClassesAttribute_info)
164            m_innerClassesAttributeOffset = offset;
165        else if (attribute instanceof BridgeAttribute_info)
166            ++ m_bridgeRefCount;
167
168        if (DISALLOW_MULTIPLE_SYNTHETIC_ATTRIBUTES && $assert.ENABLED)
169            $assert.ASSERT (m_syntheticRefCount >= 0 && m_syntheticRefCount <= 1,
170            "bad synthetic attribute count: " + m_syntheticRefCount);
171
172        return result;
173    }
174
175    public Attribute_info remove (final int offset)
176    {
177        final Attribute_info result = (Attribute_info) m_attributes.remove (offset);
178
179        if (result instanceof SyntheticAttribute_info)
180            -- m_syntheticRefCount;
181        else if (result instanceof InnerClassesAttribute_info)
182            m_innerClassesAttributeOffset = -1;
183        else if (result instanceof BridgeAttribute_info)
184            -- m_bridgeRefCount;
185
186        if (DISALLOW_MULTIPLE_SYNTHETIC_ATTRIBUTES && $assert.ENABLED)
187            $assert.ASSERT (m_syntheticRefCount >= 0 && m_syntheticRefCount <= 1,
188            "bad synthetic attribute count: " + m_syntheticRefCount);
189
190        return result;
191    }
192
193    // protected: .............................................................
194
195    // package: ...............................................................
196
197
198    AttributeCollection (final int capacity)
199    {
200        m_attributes = capacity < 0 ? new ArrayList () : new ArrayList (capacity);
201        m_innerClassesAttributeOffset = -1;
202    }
203
204    // private: ...............................................................
205
206
207    private List/* Attribute_info */ m_attributes; // never null
208    private transient int m_syntheticRefCount, m_bridgeRefCount;
209    private transient int m_innerClassesAttributeOffset;
210
211    // note: the spec does not disallow multiple synthetic attributes
212    private static final boolean DISALLOW_MULTIPLE_SYNTHETIC_ATTRIBUTES = false;
213
214    // note: the spec disallows multiple inner classes attributes
215
216} // end of class
217// ----------------------------------------------------------------------------
218