content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * 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.multidex;
  
  import com.taobao.android.dx.cf.direct.DirectClassFile;
  import com.taobao.android.dx.cf.direct.StdAttributeFactory;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  import java.util.zip.ZipException;
  import java.util.zip.ZipFile;
  
  class Path {
  
      static ClassPathElement getClassPathElement(File file)
              throws ZipException, IOException {
          if (file.isDirectory()) {
              return new FolderPathElement(file);
          } else if (file.isFile()) {
              return new ArchivePathElement(new ZipFile(file));
          } else if (file.exists()) {
              throw new IOException("\"" + file.getPath() +
                      "\" is not a directory neither a zip file");
          } else {
              throw new FileNotFoundException("File \"" + file.getPath() + "\" not found");
          }
      }
  
      List<ClassPathElement> elements = new ArrayList<ClassPathElement>();
      private final String definition;
      private final ByteArrayOutputStream baos = new ByteArrayOutputStream(40 * 1024);
      private final byte[] readBuffer = new byte[20 * 1024];
  
      Path(String definition) throws IOException {
          this.definition = definition;
          for (String filePath : definition.split(Pattern.quote(File.pathSeparator))) {
              try {
                  addElement(getClassPathElement(new File(filePath)));
              } catch (IOException e) {
                  throw new IOException("Wrong classpath: " + e.getMessage(), e);
              }
          }
      }
  
      private static byte[] readStream(InputStream in, ByteArrayOutputStream baos, byte[] readBuffer)
              throws IOException {
          try {
              for (;;) {
                  int amt = in.read(readBuffer);
                  if (amt < 0) {
                      break;
                  }
  
                  baos.write(readBuffer, 0, amt);
              }
          } finally {
              in.close();
          }
          return baos.toByteArray();
      }
  
      @Override
      public String toString() {
          return definition;
      }
  
      Iterable<ClassPathElement> getElements() {
        return elements;
      }
  
      private void addElement(ClassPathElement element) {
          assert element != null;
          elements.add(element);
      }
  
      synchronized DirectClassFile getClass(String path) throws FileNotFoundException {
          DirectClassFile classFile = null;
          for (ClassPathElement element : elements) {
              try {
                  InputStream in = element.open(path);
                  try {
                      byte[] bytes = readStream(in, baos, readBuffer);
                      baos.reset();
                      classFile = new DirectClassFile(bytes, path, false);
                      classFile.setAttributeFactory(StdAttributeFactory.THE_ONE);
                      break;
                  } finally {
                      in.close();
                  }
              } catch (IOException e) {
                  // search next element
              }
          }
          if (classFile == null) {
              throw new FileNotFoundException("File \"" + path + "\" not found");
          }
          return classFile;
      }
  }