TeeInputStream.java

/*
 * Java Tee Stream Library
 *
 * Copyright (c) Matthew Johnson 2005
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU Lesser General Public License 
 * as published by the Free Software Foundation, version 2 only.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details. 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * To Contact the author, please email src@matthew.ath.cx
 *
 */

package cx.ath.matthew.io;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Class to copy a stream to a file or another stream as it is being sent through a stream pipe
 * E.g.
 * <pre>
 *    Reader r = new InputStreamReader(new TeeInputStream(new FileInputStream("file"), new File("otherfile")));
 * </pre>
 */
public class TeeInputStream extends FilterInputStream
{
   private InputStream in;
   private OutputStream fos;
   /**
    * Create a new TeeInputStream on the given InputStream
    * and copy the stream to the given File.
    * @param is Reads from this InputStream
    * @param tos Write to this OutputStream
    */
   public TeeInputStream(InputStream is, OutputStream tos) throws IOException
   {
      super(is);
      this.in = is;
      this.fos = tos;
   }
   /**
    * Create a new TeeInputStream on the given InputStream
    * and copy the stream to the given File.
    * @param is Reads from this InputStream
    * @param f Write to this File
    * @param append Append to file not overwrite
    */
   public TeeInputStream(InputStream is, File f, boolean append) throws IOException
   {
      super(is);
      this.in = is;
      this.fos = new FileOutputStream(f, append);
   }
   /**
    * Create a new TeeInputStream on the given InputStream
    * and copy the stream to the given File.
    * @param is Reads from this InputStream
    * @param f Write to this File
    */
   public TeeInputStream(InputStream is, File f) throws IOException
   {
      super(is);
      this.in = is;
      this.fos = new FileOutputStream(f);
   }
   /**
    * Create a new TeeInputStream on the given InputStream
    * and copy the stream to the given File.
    * @param is Reads from this InputStream
    * @param f Write to this File
    * @param append Append to file not overwrite
    */
   public TeeInputStream(InputStream is, String f, boolean append) throws IOException
   {
      this(is, new File(f), append);
   }
   /**
    * Create a new TeeInputStream on the given InputStream
    * and copy the stream to the given File.
    * @param is Reads from this InputStream
    * @param f Write to this File
    */
   public TeeInputStream(InputStream is, String f) throws IOException
   {
      this(is, new File(f));
   }
   public void close() throws IOException
   {
      in.close();
      fos.close();
   }
   public void flush() throws IOException
   {
      fos.flush();
   }
   public int	available() throws IOException
   {
      return in.available();
   } 
   public int	read() throws IOException
   {
      int i = in.read();
      if (-1 != i) fos.write(i);
      return i;
   }
   public int	read(byte[] b) throws IOException
   {
      int c = in.read(b);
      if (-1 != c) fos.write(b, 0, c);
      return c;
   }
   public int	read(byte[] b, int off, int len) throws IOException
   {  
      int c = in.read(b, off, len);
      if (-1 != c) fos.write(b, off, c);
      return c;
   }
   public long	skip(long n) throws IOException
   { return in.skip(n); }
   public void	mark(int readlimit)
   {}
   public boolean	markSupported()
   { return false; }
   public void	reset() throws IOException
   { in.reset(); }

   public void finalize()
   {
      try {
         close();
      } catch (Exception e) {}
   }
}