1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 5b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) 6b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 7b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is free software; you can redistribute it and/or modify it 8b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * under the terms of the GNU General Public License as published by the Free 9b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Software Foundation; either version 2 of the License, or (at your option) 10b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * any later version. 11b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 12b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is distributed in the hope that it will be useful, but WITHOUT 13b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * more details. 16b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 17b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * You should have received a copy of the GNU General Public License along 18b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * with this program; if not, write to the Free Software Foundation, Inc., 19b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 21b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopackage proguard.classfile.visitor; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This <code>ClassVisitor</code> delegates its visits to program classes to 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * another given <code>ClassVisitor</code>, but only when the class version 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * number of the visited program class lies in a given range. 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class ClassVersionFilter implements ClassVisitor 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final int minimumClassVersion; 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final int maximumClassVersion; 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final ClassVisitor classVisitor; 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new ClassVersionFilter. 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param minimumClassVersion the minimum class version number. 42b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param classVisitor the <code>ClassVisitor</code> to which visits 43b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * will be delegated. 44b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 45b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang public ClassVersionFilter(int minimumClassVersion, 46b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang ClassVisitor classVisitor) 47b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 48b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang this(minimumClassVersion, Integer.MAX_VALUE, classVisitor); 49b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 50b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 51b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 52b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang /** 53b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Creates a new ClassVersionFilter. 54b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param minimumClassVersion the minimum class version number. 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param maximumClassVersion the maximum class version number. 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param classVisitor the <code>ClassVisitor</code> to which visits 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * will be delegated. 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public ClassVersionFilter(int minimumClassVersion, 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int maximumClassVersion, 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ClassVisitor classVisitor) 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.minimumClassVersion = minimumClassVersion; 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.maximumClassVersion = maximumClassVersion; 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.classVisitor = classVisitor; 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for ClassVisitor. 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitProgramClass(ProgramClass programClass) 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (programClass.u4version >= minimumClassVersion && 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato programClass.u4version <= maximumClassVersion) 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato classVisitor.visitProgramClass(programClass); 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitLibraryClass(LibraryClass libraryClass) 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Library classes don't have version numbers. 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 86