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.optimize; 22 23import proguard.classfile.*; 24import proguard.classfile.util.SimplifiedVisitor; 25import proguard.classfile.visitor.MemberVisitor; 26import proguard.optimize.info.ReadWriteFieldMarker; 27 28/** 29 * This <code>MemberVisitor</code> delegates its visits to program fields to 30 * other given <code>MemberVisitor</code> instances, but only when the visited 31 * field has been marked as write-only. 32 * 33 * @see ReadWriteFieldMarker 34 * @author Eric Lafortune 35 */ 36public class WriteOnlyFieldFilter 37extends SimplifiedVisitor 38implements MemberVisitor 39{ 40 private final MemberVisitor writeOnlyFieldVisitor; 41 42 43 /** 44 * Creates a new WriteOnlyFieldFilter. 45 * @param writeOnlyFieldVisitor the <code>MemberVisitor</code> to which 46 * visits to write-only fields will be delegated. 47 */ 48 public WriteOnlyFieldFilter(MemberVisitor writeOnlyFieldVisitor) 49 { 50 this.writeOnlyFieldVisitor = writeOnlyFieldVisitor; 51 } 52 53 54 // Implementations for MemberVisitor. 55 56 public void visitProgramField(ProgramClass programClass, ProgramField programField) 57 { 58 59 if (ReadWriteFieldMarker.isWritten(programField) && 60 !ReadWriteFieldMarker.isRead(programField)) 61 { 62 writeOnlyFieldVisitor.visitProgramField(programClass, programField); 63 } 64 } 65} 66