/**
    * Copyright 2007 Google Inc.
    *
    * 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.tonicsystems.jarjar.util;
  
  import java.io.*;
  import org.objectweb.asm.ClassReader;
  import org.objectweb.asm.ClassVisitor;
  import org.objectweb.asm.ClassWriter;
  
  abstract public class JarTransformer implements JarProcessor
  {
      public boolean process(EntryStruct struct) throws IOException {
          if (struct.name.endsWith(".class")) {
              ClassReader reader;
              try {
                  reader = new ClassReader(struct.data);
              } catch (Exception e) {
                  return true; // TODO?
              }
              GetNameClassWriter w = new GetNameClassWriter(ClassWriter.COMPUTE_MAXS);
              reader.accept(transform(w), ClassReader.EXPAND_FRAMES);
              struct.data = w.toByteArray();
              struct.name = pathFromName(w.getClassName());
          }
          return true;
      }
  
      abstract protected ClassVisitor transform(ClassVisitor v);
  
      private static String pathFromName(String className) {
          return className.replace('.', '/') + ".class";
      }
  }