/**
    * Copyright 2010-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.maven.wagon;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  
  import com.amazonaws.services.s3.internal.RepeatableFileInputStream;
  
  /**
   * An extension to the {@link FileInputStream} that notifies a @{link TransferProgress} object as it is being read from
   *
   * @author Ben Hale
   * @since 1.1
   */
  public class TransferProgressFileInputStream extends RepeatableFileInputStream {
  
      private TransferProgress progress;
  
      public TransferProgressFileInputStream(File file, TransferProgress progress) throws FileNotFoundException {
          super(file);
          this.progress = progress;
      }
  
      @Override
      public int read() throws IOException {
          int b = super.read();
          if (b != -1) {
              progress.notify(new byte[] { (byte) b }, 1);
          }
          return b;
      }
  
      @Override
      public int read(byte b[]) throws IOException {
          int length = super.read(b);
          if (length != -1) {
              progress.notify(b, length);
          }
          return length;
      }
  
      @Override
      public int read(byte b[], int off, int len) throws IOException {
          int count = super.read(b, off, len);
          if (count == -1) {
              return count;
          }
          if (off == 0) {
              progress.notify(b, count);
          } else {
              byte[] bytes = new byte[len];
              System.arraycopy(b, off, bytes, 0, count);
              progress.notify(bytes, count);
          }
          return count;
      }
  }