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.optimize.peephole;
22
23import proguard.classfile.ProgramClass;
24import proguard.classfile.constant.visitor.ConstantVisitor;
25import proguard.classfile.util.SimplifiedVisitor;
26import proguard.classfile.visitor.ClassVisitor;
27
28/**
29 * This ClassVisitor inlines the direct subclasses into the program classes
30 * that it visits, whenever possible.
31 *
32 * @see ClassMerger
33 * @author Eric Lafortune
34 */
35public class VerticalClassMerger
36extends      SimplifiedVisitor
37implements   ClassVisitor
38{
39    private final boolean      allowAccessModification;
40    private final boolean      mergeInterfacesAggressively;
41    private final ClassVisitor extraClassVisitor;
42
43
44    /**
45     * Creates a new VerticalClassMerger.
46     * @param allowAccessModification     specifies whether the access modifiers
47     *                                    of classes can be changed in order to
48     *                                    merge them.
49     * @param mergeInterfacesAggressively specifies whether interfaces may
50     *                                    be merged aggressively.
51     */
52    public VerticalClassMerger(boolean allowAccessModification,
53                               boolean mergeInterfacesAggressively)
54    {
55        this(allowAccessModification, mergeInterfacesAggressively, null);
56    }
57
58
59    /**
60     * Creates a new VerticalClassMerger.
61     * @param allowAccessModification     specifies whether the access modifiers
62     *                                    of classes can be changed in order to
63     *                                    merge them.
64     * @param mergeInterfacesAggressively specifies whether interfaces may
65     *                                    be merged aggressively.
66     * @param extraClassVisitor           an optional extra visitor for all
67     *                                    merged classes.
68     */
69    public VerticalClassMerger(boolean      allowAccessModification,
70                               boolean      mergeInterfacesAggressively,
71                               ClassVisitor extraClassVisitor)
72    {
73        this.allowAccessModification     = allowAccessModification;
74        this.mergeInterfacesAggressively = mergeInterfacesAggressively;
75        this.extraClassVisitor           = extraClassVisitor;
76    }
77
78
79    // Implementations for ClassVisitor.
80
81    public void visitProgramClass(ProgramClass programClass)
82    {
83        programClass.subclassesAccept(new ClassMerger(programClass,
84                                                      allowAccessModification,
85                                                      mergeInterfacesAggressively,
86                                                      extraClassVisitor));
87    }
88}