/*
    * Copyright 2004-2007 the original author or authors.
    *
    * 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 org.kuali.maven.wagon;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  
  /**
   * 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 FileInputStream {
  
  	private TransferProgress progress;
  
  	public TransferProgressFileInputStream(File file, TransferProgress progress) throws FileNotFoundException {
  		super(file);
  		this.progress = progress;
  	}
  
  	public int read() throws IOException {
  		int b = super.read();
  		if (b != -1) {
  			progress.notify(new byte[] { (byte) b }, 1);
  		}
  		return b;
  	}
  
  	public int read(byte b[]) throws IOException {
  		int length = super.read(b);
  		if (length != -1) {
  			progress.notify(b, length);
  		}
  		return length;
  	}
  
  	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;
  	}
  }