1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.mkstubs; 18 19 import com.android.mkstubs.Main.Logger; 20 import com.android.mkstubs.stubber.ClassStubber; 21 22 import org.objectweb.asm.ClassReader; 23 import org.objectweb.asm.ClassVisitor; 24 import org.objectweb.asm.ClassWriter; 25 26 import java.io.File; 27 import java.io.FileOutputStream; 28 import java.io.IOException; 29 import java.util.Map; 30 import java.util.Map.Entry; 31 import java.util.TreeMap; 32 import java.util.jar.JarEntry; 33 import java.util.jar.JarOutputStream; 34 35 /** 36 * Given a set of already filtered classes, this filters out all private members, 37 * stubs the remaining classes and then generates a Jar out of them. 38 * <p/> 39 * This is an helper extracted for convenience. Callers just need to use 40 * {@link #generateStubbedJar(File, Map, Filter)}. 41 */ 42 class StubGenerator { 43 44 private Logger mLog; 45 StubGenerator(Logger log)46 public StubGenerator(Logger log) { 47 mLog = log; 48 } 49 50 /** 51 * Generate source for the stubbed classes, mostly for debug purposes. 52 * @throws IOException 53 */ generateStubbedJar(File destJar, Map<String, ClassReader> classes, Filter filter)54 public void generateStubbedJar(File destJar, 55 Map<String, ClassReader> classes, 56 Filter filter) throws IOException { 57 58 TreeMap<String, byte[]> all = new TreeMap<String, byte[]>(); 59 60 for (Entry<String, ClassReader> entry : classes.entrySet()) { 61 ClassReader cr = entry.getValue(); 62 63 byte[] b = visitClassStubber(cr, filter); 64 String name = classNameToEntryPath(cr.getClassName()); 65 all.put(name, b); 66 } 67 68 createJar(new FileOutputStream(destJar), all); 69 70 mLog.debug("Wrote %s", destJar.getPath()); 71 } 72 73 /** 74 * Utility method that converts a fully qualified java name into a JAR entry path 75 * e.g. for the input "android.view.View" it returns "android/view/View.class" 76 */ classNameToEntryPath(String className)77 String classNameToEntryPath(String className) { 78 return className.replaceAll("\\.", "/").concat(".class"); 79 } 80 81 /** 82 * Writes the JAR file. 83 * 84 * @param outStream The file output stream were to write the JAR. 85 * @param all The map of all classes to output. 86 * @throws IOException if an I/O error has occurred 87 */ createJar(FileOutputStream outStream, Map<String,byte[]> all)88 void createJar(FileOutputStream outStream, Map<String,byte[]> all) throws IOException { 89 JarOutputStream jar = new JarOutputStream(outStream); 90 for (Entry<String, byte[]> entry : all.entrySet()) { 91 String name = entry.getKey(); 92 JarEntry jar_entry = new JarEntry(name); 93 jar.putNextEntry(jar_entry); 94 jar.write(entry.getValue()); 95 jar.closeEntry(); 96 } 97 jar.flush(); 98 jar.close(); 99 } 100 visitClassStubber(ClassReader cr, Filter filter)101 byte[] visitClassStubber(ClassReader cr, Filter filter) { 102 mLog.debug("Stub " + cr.getClassName()); 103 104 // Rewrite the new class from scratch, without reusing the constant pool from the 105 // original class reader. 106 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); 107 108 ClassVisitor stubWriter = new ClassStubber(cw); 109 ClassVisitor classFilter = new FilterClassAdapter(stubWriter, filter, mLog); 110 cr.accept(classFilter, 0 /*flags*/); 111 return cw.toByteArray(); 112 } 113 } 114