TeeInputStream.java

/*
 * Java Tee Stream Library
 *
 * Copyright (c) Matthew Johnson 2005
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * 
 * 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) {}
   }
}