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/* 
 *
 * Copyright (c) 2001 Torgeir Veimo
 *
 * 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.
 *
 */
package com.nothome.delta;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * For debugging patch generation.
 */
public class DebugDiffWriter implements DiffWriter {
  /** The os. */
  private ByteArrayOutputStream os = new ByteArrayOutputStream();

  /**
   * Constructs a new DebugDiffWriter.
   */
  public DebugDiffWriter() {}

  /* (non-Javadoc)
   * @see com.nothome.delta.DiffWriter#addCopy(long, int)
   */
  @Override
  public void addCopy(long offset, int length) throws IOException {
    if (os.size() > 0)
      writeBuf();
    System.err.println("COPY off: " + offset + ", len: " + length);
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.DiffWriter#addData(byte)
   */
  @Override
  public void addData(byte b) throws IOException {
    os.write(b);
    writeBuf();
  }

  /**
   * Write buf.
   */
  private void writeBuf() {
    System.err.print("DATA: ");
    byte[] ba = os.toByteArray();
    for (int ix = 0; ix < ba.length; ix++) {
      if (ba[ix] == '\n')
        System.err.print("\\n");
      else
        System.err.print(String.valueOf(((char) ba[ix])));
      //System.err.print("0x" + Integer.toHexString(buf[ix]) + " "); // hex output
    }
    System.err.println("");
    os.reset();
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.DiffWriter#flush()
   */
  @Override
  public void flush() throws IOException {
    System.err.println("FLUSH");
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.DiffWriter#close()
   */
  @Override
  public void close() throws IOException {
    System.err.println("CLOSE");
  }
}