1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2013 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; 22 23import proguard.classfile.ClassPool; 24import proguard.classfile.attribute.visitor.AllAttributeVisitor; 25import proguard.classfile.constant.visitor.AllConstantVisitor; 26import proguard.classfile.instruction.visitor.AllInstructionVisitor; 27import proguard.classfile.util.*; 28import proguard.classfile.visitor.*; 29import proguard.optimize.*; 30import proguard.util.*; 31 32import java.io.*; 33import java.util.*; 34 35/** 36 * This class prints out the seeds specified by keep options. 37 * 38 * @author Eric Lafortune 39 */ 40public class SeedPrinter 41{ 42 private final PrintStream ps; 43 44 45 /** 46 * Creates a new ConfigurationWriter for the given PrintStream. 47 */ 48 public SeedPrinter(PrintStream ps) throws IOException 49 { 50 this.ps = ps; 51 } 52 53 54 /** 55 * Prints out the seeds for the classes in the given program class pool. 56 * @param configuration the configuration containing the keep options. 57 * @throws IOException if an IO error occurs while writing the configuration. 58 */ 59 public void write(Configuration configuration, 60 ClassPool programClassPool, 61 ClassPool libraryClassPool) throws IOException 62 { 63 // Check if we have at least some keep commands. 64 if (configuration.keep == null) 65 { 66 throw new IOException("You have to specify '-keep' options for the shrinking step."); 67 } 68 69 // Clean up any old visitor info. 70 programClassPool.classesAccept(new ClassCleaner()); 71 libraryClassPool.classesAccept(new ClassCleaner()); 72 73 // Create a visitor for printing out the seeds. We're printing out 74 // the program elements that are preserved against shrinking, 75 // optimization, or obfuscation. 76 KeepMarker keepMarker = new KeepMarker(); 77 ClassPoolVisitor classPoolvisitor = 78 ClassSpecificationVisitorFactory.createClassPoolVisitor(configuration.keep, 79 keepMarker, 80 keepMarker, 81 true, 82 true, 83 true); 84 // Mark the seeds. 85 programClassPool.accept(classPoolvisitor); 86 libraryClassPool.accept(classPoolvisitor); 87 88 // Print out the seeds. 89 SimpleClassPrinter printer = new SimpleClassPrinter(false, ps); 90 programClassPool.classesAcceptAlphabetically(new MultiClassVisitor( 91 new ClassVisitor[] 92 { 93 new KeptClassFilter(printer), 94 new AllMemberVisitor(new KeptMemberFilter(printer)) 95 })); 96 } 97}