| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * 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 one of two |
| * <code>ClassVisitor</code> instances, depending on whether the name of |
| * the visited class file is present in a given <code>ClassPool</code> or not. |
| * |
| * @author Eric Lafortune |
| */ |
| public class ClassPresenceFilter implements ClassVisitor |
| { |
| private final ClassPool classPool; |
| private final ClassVisitor presentClassVisitor; |
| private final ClassVisitor missingClassVisitor; |
| |
| |
| /** |
| * Creates a new ClassPresenceFilter. |
| * @param classPool the <code>ClassPool</code> in which the |
| * presence will be tested. |
| * @param presentClassVisitor the <code>ClassVisitor</code> to which visits |
| * of present class files will be delegated. |
| * @param missingClassVisitor the <code>ClassVisitor</code> to which visits |
| * of missing class files will be delegated. |
| */ |
| public ClassPresenceFilter(ClassPool classPool, |
| ClassVisitor presentClassVisitor, |
| ClassVisitor missingClassVisitor) |
| { |
| this.classPool = classPool; |
| this.presentClassVisitor = presentClassVisitor; |
| this.missingClassVisitor = missingClassVisitor; |
| } |
| |
| |
| // Implementations for ClassVisitor. |
| |
| public void visitProgramClass(ProgramClass programClass) |
| { |
| ClassVisitor classFileVisitor = classFileVisitor(programClass); |
| |
| if (classFileVisitor != null) |
| { |
| classFileVisitor.visitProgramClass(programClass); |
| } |
| } |
| |
| |
| public void visitLibraryClass(LibraryClass libraryClass) |
| { |
| ClassVisitor classFileVisitor = classFileVisitor(libraryClass); |
| |
| if (classFileVisitor != null) |
| { |
| classFileVisitor.visitLibraryClass(libraryClass); |
| } |
| } |
| |
| |
| // Small utility methods. |
| |
| /** |
| * Returns the appropriate <code>ClassVisitor</code>. |
| */ |
| private ClassVisitor classFileVisitor(Clazz clazz) |
| { |
| return classPool.getClass(clazz.getName()) != null ? |
| presentClassVisitor : |
| missingClassVisitor; |
| } |
| } |