Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * */ package com.taobao.android.builder.tools.asm; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import org.apache.commons.io.IOUtils; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassVisitor; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.MethodVisitor; import org.objectweb.asm.Opcodes; /** * Created by wuzhong on 2017/3/30. */ public class ClassNameRenamer { public static void rewriteDataBinderMapper(File dir, String fromName, String toName, File Clazz) throws IOException { FileInputStream fileInputStream = new FileInputStream(Clazz); ClassReader in1 = new ClassReader(fileInputStream); ClassWriter cw = new ClassWriter(0); Set<String> renames = new HashSet<String>(); renames.add(fromName); in1.accept(new ClassRenamer(cw, renames, toName), 8); File destClass = new File(dir, toName + ".class"); destClass.getParentFile().mkdirs(); FileOutputStream fileOutputStream = new FileOutputStream(destClass); fileOutputStream.write(cw.toByteArray()); IOUtils.closeQuietly(fileOutputStream); IOUtils.closeQuietly(fileInputStream); } static class ClassRenamer extends ClassVisitor implements Opcodes { private Set oldNames; private final String newName; public ClassRenamer(ClassVisitor cv, Set oldNames, String newName) { super(ASM4, cv); this.oldNames = oldNames; this.newName = newName; } @Override public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) { oldNames.add(name); cv.visit(version, ACC_PUBLIC, newName, signature, superName, interfaces); } @Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) { MethodVisitor mv = cv.visitMethod(access, name, desc, fix(signature), exceptions); if (mv != null && (access & ACC_ABSTRACT) == 0) { mv = new ClassRenamer.MethodRenamer(mv); } return mv; } class MethodRenamer extends MethodVisitor { public MethodRenamer(final MethodVisitor mv) { super(ASM4, mv); } @Override public void visitTypeInsn(int i, String s) { if (oldNames.contains(s)) { s = newName; } mv.visitTypeInsn(i, s); } @Override public void visitFieldInsn(int opcode, String owner, String name, String desc) { if (oldNames.contains(owner)) { mv.visitFieldInsn(opcode, newName, name, fix(desc)); } else { mv.visitFieldInsn(opcode, owner, name, fix(desc)); } } @Override public void visitMethodInsn(int opcode, String owner, String name, String desc) { if (oldNames.contains(owner)) { mv.visitMethodInsn(opcode, newName, name, fix(desc)); } else { mv.visitMethodInsn(opcode, owner, name, fix(desc)); } } } private String fix(String s) { if (s != null) { Iterator it = oldNames.iterator(); String name; while (it.hasNext()) { name = (String) it.next(); if (s.indexOf(name) != -1) { s = s.replaceAll(name, newName); } } } return s; } } }