| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.visitor; |
| |
| import proguard.classfile.*; |
| |
| /** |
| * This <code>ClassVisitor</code> delegates its visits to program classes to |
| * another given <code>ClassVisitor</code>, but only when the class version |
| * number of the visited program class lies in a given range. |
| * |
| * @author Eric Lafortune |
| */ |
| public class ClassVersionFilter implements ClassVisitor |
| { |
| private final int minimumClassVersion; |
| private final int maximumClassVersion; |
| private final ClassVisitor classVisitor; |
| |
| |
| /** |
| * Creates a new ClassVersionFilter. |
| * @param minimumClassVersion the minimum class version number. |
| * @param classVisitor the <code>ClassVisitor</code> to which visits |
| * will be delegated. |
| */ |
| public ClassVersionFilter(int minimumClassVersion, |
| ClassVisitor classVisitor) |
| { |
| this(minimumClassVersion, Integer.MAX_VALUE, classVisitor); |
| } |
| |
| |
| /** |
| * Creates a new ClassVersionFilter. |
| * @param minimumClassVersion the minimum class version number. |
| * @param maximumClassVersion the maximum class version number. |
| * @param classVisitor the <code>ClassVisitor</code> to which visits |
| * will be delegated. |
| */ |
| public ClassVersionFilter(int minimumClassVersion, |
| int maximumClassVersion, |
| ClassVisitor classVisitor) |
| { |
| this.minimumClassVersion = minimumClassVersion; |
| this.maximumClassVersion = maximumClassVersion; |
| this.classVisitor = classVisitor; |
| } |
| |
| |
| // Implementations for ClassVisitor. |
| |
| public void visitProgramClass(ProgramClass programClass) |
| { |
| if (programClass.u4version >= minimumClassVersion && |
| programClass.u4version <= maximumClassVersion) |
| { |
| classVisitor.visitProgramClass(programClass); |
| } |
| } |
| |
| |
| public void visitLibraryClass(LibraryClass libraryClass) |
| { |
| // Library classes don't have version numbers. |
| } |
| } |