1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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 */
21package proguard;
22
23import proguard.classfile.ClassPool;
24import proguard.classfile.util.ClassUtil;
25import proguard.classfile.visitor.ClassVersionSetter;
26
27import java.io.IOException;
28import java.util.*;
29
30/**
31 * This class sets the target version on program classes.
32 *
33 * @author Eric Lafortune
34 */
35public class Targeter
36{
37    private final Configuration configuration;
38
39
40    /**
41     * Creates a new Targeter to set the target version on program classes
42     * according to the given configuration.
43     */
44    public Targeter(Configuration configuration)
45    {
46        this.configuration = configuration;
47    }
48
49
50    /**
51     * Sets the target version on classes in the given program class pool.
52     */
53    public void execute(ClassPool programClassPool) throws IOException
54    {
55        Set newerClassVersions = configuration.warn != null ? null : new HashSet();
56
57        programClassPool.classesAccept(new ClassVersionSetter(configuration.targetClassVersion,
58                                                              newerClassVersions));
59
60        if (newerClassVersions != null &&
61            newerClassVersions.size() > 0)
62        {
63            System.err.print("Warning: some classes have more recent versions (");
64
65            Iterator iterator = newerClassVersions.iterator();
66            while (iterator.hasNext())
67            {
68                Integer classVersion = (Integer)iterator.next();
69                System.err.print(ClassUtil.externalClassVersion(classVersion.intValue()));
70
71                if (iterator.hasNext())
72                {
73                    System.err.print(",");
74                }
75            }
76
77            System.err.println(")");
78            System.err.println("         than the target version ("+ClassUtil.externalClassVersion(configuration.targetClassVersion)+").");
79
80            if (!configuration.ignoreWarnings)
81            {
82                System.err.println("         If you are sure this is not a problem,");
83                System.err.println("         you could try your luck using the '-ignorewarnings' option.");
84                throw new IOException("Please correct the above warnings first.");
85            }
86        }
87    }
88}
89