content: /*
   * Copyright (C) 2010-2101 Alibaba Group Holding Limited.
   *
   * 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.alibaba.otter.node.etl.common.pipe.impl.http.archive;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * 基于lazy实现的InputSteam
   * 
   * @author jianghang 2013-3-6 下午02:24:30
   * @version 4.1.7
   */
  public class LazyFileInputStream extends InputStream {
  
      private InputStream delegate;
      private File        file;
  
      public LazyFileInputStream(File file){
          this.file = file;
      }
  
      public InputStream getInputSteam() throws FileNotFoundException {
          delegate = new FileInputStream(file);
          return delegate;
      }
  
      public void close() throws IOException {
          if (delegate != null) {
              delegate.close();
          }
      }
  
      public int read() throws IOException {
          return 0;
      }
  }
  