1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 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.optimize.peephole; 22 23 import proguard.classfile.ProgramClass; 24 import proguard.classfile.util.SimplifiedVisitor; 25 import 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 */ 34 public class HorizontalClassMerger 35 extends SimplifiedVisitor 36 implements 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 */ HorizontalClassMerger(boolean allowAccessModification, boolean mergeInterfacesAggressively)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 */ HorizontalClassMerger(boolean allowAccessModification, boolean mergeInterfacesAggressively, ClassVisitor extraClassVisitor)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 visitProgramClass(ProgramClass programClass)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 }