content: /*
   * Copyright (C) 2013 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 java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Enumeration;
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipFile;
  
  /**
   * A zip element.
   */
  class ArchivePathElement implements ClassPathElement {
  
      static class DirectoryEntryException extends IOException {
      }
  
      private final ZipFile archive;
  
      public ArchivePathElement(ZipFile archive) {
          this.archive = archive;
      }
  
      @Override
      public InputStream open(String path) throws IOException {
          ZipEntry entry = archive.getEntry(path);
          if (entry == null) {
              throw new FileNotFoundException("File \"" + path + "\" not found");
          } else if (entry.isDirectory()) {
              throw new DirectoryEntryException();
          } else {
              return archive.getInputStream(entry);
          }
      }
  
      @Override
      public void close() throws IOException {
          archive.close();
      }
  
      @Override
      public Iterable<String> list() {
          return new Iterable<String>() {
  
              @Override
              public Iterator<String> iterator() {
                  return new Iterator<String>() {
                      Enumeration<? extends ZipEntry> delegate = archive.entries();
                      ZipEntry next = null;
  
                      @Override
                      public boolean hasNext() {
                          while (next == null && delegate.hasMoreElements()) {
                              next = delegate.nextElement();
                              if (next.isDirectory()) {
                                  next = null;
                              }
                          }
                          return next != null;
                      }
  
                      @Override
                      public String next() {
                          if (hasNext()) {
                              String name = next.getName();
                              next = null;
                              return name;
                          } else {
                              throw new NoSuchElementException();
                          }
                      }
  
                      @Override
                      public void remove() {
                          throw new UnsupportedOperationException();
                      }
                  };
              }
          };
      }
  
  }
  