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.util.SimplifiedVisitor; 25 26/** 27 * This <code>MemberVisitor</code> delegates its visits to methods to 28 * another given <code>MemberVisitor</code>, but only when the visited 29 * method may have implementations. 30 * 31 * @see Clazz#mayHaveImplementations(Method) 32 * @author Eric Lafortune 33 */ 34public class MethodImplementationFilter 35extends SimplifiedVisitor 36implements MemberVisitor 37{ 38 private final MemberVisitor memberVisitor; 39 40 41 /** 42 * Creates a new MethodImplementationFilter. 43 * @param memberVisitor the <code>MemberVisitor</code> to which 44 * visits will be delegated. 45 */ 46 public MethodImplementationFilter(MemberVisitor memberVisitor) 47 { 48 this.memberVisitor = memberVisitor; 49 } 50 51 52 // Implementations for MemberVisitor. 53 54 public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) 55 { 56 if (programClass.mayHaveImplementations(programMethod)) 57 { 58 memberVisitor.visitProgramMethod(programClass, programMethod); 59 } 60 } 61 62 63 public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) 64 { 65 if (libraryClass.mayHaveImplementations(libraryMethod)) 66 { 67 memberVisitor.visitLibraryMethod(libraryClass, libraryMethod); 68 } 69 } 70} 71