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.classfile.visitor; 22 23import proguard.classfile.*; 24 25import java.util.Set; 26 27/** 28 * This <code>ClassVisitor</code> sets the version number of the program classes 29 * that it visits. 30 * 31 * @author Eric Lafortune 32 */ 33public class ClassVersionSetter implements ClassVisitor 34{ 35 private final int classVersion; 36 37 private final Set newerClassVersions; 38 39 40 /** 41 * Creates a new ClassVersionSetter. 42 * @param classVersion the class version number. 43 */ 44 public ClassVersionSetter(int classVersion) 45 { 46 this(classVersion, null); 47 } 48 49 50 /** 51 * Creates a new ClassVersionSetter that also stores any newer class version 52 * numbers that it encounters while visiting program classes. 53 * @param classVersion the class version number. 54 * @param newerClassVersions the <code>Set</code> in which newer class 55 * version numbers can be collected. 56 */ 57 public ClassVersionSetter(int classVersion, 58 Set newerClassVersions) 59 { 60 this.classVersion = classVersion; 61 this.newerClassVersions = newerClassVersions; 62 } 63 64 65 // Implementations for ClassVisitor. 66 67 public void visitProgramClass(ProgramClass programClass) 68 { 69 if (programClass.u4version > classVersion && 70 newerClassVersions != null) 71 { 72 newerClassVersions.add(new Integer(programClass.u4version)); 73 } 74 75 programClass.u4version = classVersion; 76 } 77 78 79 public void visitLibraryClass(LibraryClass libraryClass) 80 { 81 // Library classes don't have version numbers. 82 } 83} 84