1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 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.*; 24import proguard.classfile.constant.visitor.ConstantVisitor; 25import proguard.classfile.constant.ClassConstant; 26import proguard.classfile.util.SimplifiedVisitor; 27 28/** 29 * This <code>ConstantVisitor</code> delegates its visits to class constants 30 * to another given <code>ConstantVisitor</code>, except for classes that 31 * extend or implement a given class. This exception includes the class itself. 32 * 33 * @author Eric Lafortune 34 */ 35public class ImplementedClassConstantFilter 36extends SimplifiedVisitor 37implements ConstantVisitor 38{ 39 private final Clazz implementedClass; 40 private final ConstantVisitor constantVisitor; 41 42 43 /** 44 * Creates a new ImplementedClassConstantFilter. 45 * @param implementedClass the class whose implementations will not be 46 * visited. 47 * @param constantVisitor the <code>ConstantVisitor</code> to which visits 48 * will be delegated. 49 */ 50 public ImplementedClassConstantFilter(Clazz implementedClass, 51 ConstantVisitor constantVisitor) 52 { 53 this.implementedClass = implementedClass; 54 this.constantVisitor = constantVisitor; 55 } 56 57 58 // Implementations for ConstantVisitor. 59 60 public void visitClassConstant(Clazz clazz, ClassConstant classConstant) 61 { 62 Clazz referencedClass = classConstant.referencedClass; 63 if (referencedClass == null || 64 !referencedClass.extendsOrImplements(implementedClass)) 65 { 66 constantVisitor.visitClassConstant(clazz, classConstant); 67 } 68 } 69}