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package com.sta.cts;

import java.io.InputStream;
import java.io.IOException;
import java.io.FilterInputStream;

/**
 * Name: ProgressInputStream
 * Description: Input-Stream mit Fortschrittsermittlung.
 * Copyright: Copyright (c) 2004, 2009, 2016, 2017, 2019, 2021
 * Company: >StA-Soft<
 * @author StA
 * @version 1.0
 */

public class ProgressInputStream extends FilterInputStream
{

  /**
   * Dateigr??e.
   */

  private long myFileSize;

  /**
   * Aktuelle Position in der Datei.
   */

  private long myFilePos;

  //===========================================================================

  /**
   * Constructor mit InputStream.
   * @param in zu verwendender InputStream
   */

  public ProgressInputStream(InputStream in)
  {
    super(in);
    myFileSize = 0;
    myFilePos = 0;
    try
    {
      myFileSize = in.available();
    }
    catch (IOException ioe)
    {
    }
  }

  //===========================================================================

  @Override
  public int read() throws IOException
  {
    int i = in.read();
    if (i >= 0)
    {
      myFilePos++;
    }
    return i;
  }

  @Override
  public int read(byte[] b) throws IOException
  {
    int cnt = in.read(b);
    if (cnt > 0)
    {
      myFilePos += cnt;
    }
    return cnt;
  }

  @Override
  public int read(byte[] b, int off, int len) throws IOException
  {
    int cnt = in.read(b, off, len);
    if (cnt > 0)
    {
      myFilePos += cnt;
    }
    return cnt;
  }

  @Override
  public long skip(long n) throws IOException
  {
    long cnt = in.skip(n);
    if (cnt > 0)
    {
      myFilePos += cnt;
    }
    return cnt;
  }

  @Override
  public void close() throws IOException
  {
    in.close();
  }

  @Override
  public /* synchronized */ void reset() throws IOException
  {
    in.reset();
    myFilePos = myFileSize - in.available();
  }

  /**
   * Dateigr??e ermitteln.
   * @return Dateigr??e
   */

  public long getFileSize()
  {
    return myFileSize;
  }

  /**
   * Position in der Datei ermitteln.
   * @return Position in der Datei
   */

  public long getFilePos()
  {
    return myFilePos;
  }

}