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.*;
24import proguard.classfile.util.SimplifiedVisitor;
25import proguard.classfile.visitor.*;
26
27/**
28 * This ClassVisitor inlines siblings in the program classes that it visits,
29 * whenever possible.
30 *
31 * @see ClassMerger
32 * @author Eric Lafortune
33 */
34public class HorizontalClassMerger
35extends      SimplifiedVisitor
36implements   ClassVisitor
37{
38    private final boolean      allowAccessModification;
39    private final boolean      mergeInterfacesAggressively;
40    private final ClassVisitor extraClassVisitor;
41
42
43    /**
44     * Creates a new HorizontalClassMerger.
45     * @param allowAccessModification     specifies whether the access modifiers
46     *                                    of classes can be changed in order to
47     *                                    merge them.
48     * @param mergeInterfacesAggressively specifies whether interfaces may
49     *                                    be merged aggressively.
50     */
51    public HorizontalClassMerger(boolean allowAccessModification,
52                                 boolean mergeInterfacesAggressively)
53    {
54        this(allowAccessModification, mergeInterfacesAggressively, null);
55    }
56
57
58    /**
59     * Creates a new VerticalClassMerger.
60     * @param allowAccessModification     specifies whether the access modifiers
61     *                                    of classes can be changed in order to
62     *                                    merge them.
63     * @param mergeInterfacesAggressively specifies whether interfaces may
64     *                                    be merged aggressively.
65     * @param extraClassVisitor           an optional extra visitor for all
66     *                                    merged classes.
67     */
68    public HorizontalClassMerger(boolean      allowAccessModification,
69                                 boolean      mergeInterfacesAggressively,
70                                 ClassVisitor extraClassVisitor)
71    {
72        this.allowAccessModification     = allowAccessModification;
73        this.mergeInterfacesAggressively = mergeInterfacesAggressively;
74        this.extraClassVisitor           = extraClassVisitor;
75    }
76
77
78    // Implementations for ClassVisitor.
79
80    public void visitProgramClass(ProgramClass programClass)
81    {
82        programClass.superClassConstantAccept(new ReferencedClassVisitor(
83                                              new SubclassTraveler(
84                                              new ProgramClassFilter(
85                                              new ClassMerger(programClass,
86                                                              allowAccessModification,
87                                                              mergeInterfacesAggressively,
88                                                              extraClassVisitor)))));
89    }
90}