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Java > Open Source Codes > proguard > io > ClassReader


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.io;
22
23 import proguard.classfile.*;
24 import proguard.classfile.io.*;
25 import proguard.classfile.util.*;
26 import proguard.classfile.visitor.ClassVisitor;
27
28 import java.io.*;
29
30 /**
31  * This DataEntryReader applies a given ClassVisitor to the class
32  * definitions that it reads.
33  * <p>
34  * Class files are read as ProgramClass objects or LibraryClass objects,
35  * depending on the <code>isLibrary</code> flag.
36  * <p>
37  * In case of libraries, only public classes are considered, if the
38  * <code>skipNonPublicLibraryClasses</code> flag is set.
39  *
40  * @author Eric Lafortune
41  */
42 public class ClassReader implements DataEntryReader
43 {
44     private boolean isLibrary;
45     private boolean skipNonPublicLibraryClasses;
46     private boolean skipNonPublicLibraryClassMembers;
47     private WarningPrinter warningPrinter;
48     private ClassVisitor classVisitor;
49
50
51     /**
52      * Creates a new DataEntryClassFilter for reading the specified
53      * Clazz objects.
54      */
55     public ClassReader(boolean isLibrary,
56                        boolean skipNonPublicLibraryClasses,
57                        boolean skipNonPublicLibraryClassMembers,
58                        WarningPrinter warningPrinter,
59                        ClassVisitor classVisitor)
60     {
61         this.isLibrary = isLibrary;
62         this.skipNonPublicLibraryClasses = skipNonPublicLibraryClasses;
63         this.skipNonPublicLibraryClassMembers = skipNonPublicLibraryClassMembers;
64         this.warningPrinter = warningPrinter;
65         this.classVisitor = classVisitor;
66     }
67
68
69     // Implementations for DataEntryReader.
70
71     public void read(DataEntry dataEntry) throws IOException
72     {
73         try
74         {
75             // Get the input stream.
76 InputStream inputStream = dataEntry.getInputStream();
77
78             // Wrap it into a data input stream.
79 DataInputStream dataInputStream = new DataInputStream(inputStream);
80
81             // Create a Clazz representation.
82 Clazz clazz;
83             if (isLibrary)
84             {
85                 clazz = new LibraryClass();
86                 clazz.accept(new LibraryClassReader(dataInputStream, skipNonPublicLibraryClasses, skipNonPublicLibraryClassMembers));
87             }
88             else
89             {
90                 clazz = new ProgramClass();
91                 clazz.accept(new ProgramClassReader(dataInputStream));
92             }
93
94             // Apply the visitor, if we have a real class.
95 String JavaDoc className = clazz.getName();
96             if (className != null)
97             {
98                 if (!dataEntry.getName().replace(File.pathSeparatorChar, ClassConstants.INTERNAL_PACKAGE_SEPARATOR).equals(className+ClassConstants.CLASS_FILE_EXTENSION) &&
99                     warningPrinter != null)
100                 {
101                     warningPrinter.print("Warning: class [" + dataEntry.getName() + "] unexpectedly contains class [" + ClassUtil.externalClassName(className) + "]");
102                 }
103
104                 clazz.accept(classVisitor);
105             }
106
107             dataEntry.closeInputStream();
108         }
109         catch (Exception JavaDoc ex)
110         {
111             throw new IOException("Can't process class ["+dataEntry.getName()+"] ("+ex.getMessage()+")");
112         }
113     }
114 }
115
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