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/*
 * Copyright (c) 1998-2018 John Caron and University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.nc2.util;

import java.io.*;

/**
 * An unsynchronized version of a BufferedWriter, for performance.
 * 
 * @author com.elharo.io
 * @since Nov 4, 2007
 * @deprecated do not use
 *             TODO move to inner class of IO if needed.
 */
@Deprecated
public class UnsynchronizedBufferedWriter extends Writer {

  private static final int CAPACITY = 8192;

  private char[] buffer = new char[CAPACITY];
  private int position;
  private Writer out;
  private boolean closed;

  public UnsynchronizedBufferedWriter(Writer out) {
    this.out = out;
  }

  public void write(char[] text, int offset, int length) throws IOException {
    checkClosed();
    while (length > 0) {
      int n = Math.min(CAPACITY - position, length);
      System.arraycopy(text, offset, buffer, position, n);
      position += n;
      offset += n;
      length -= n;
      if (position >= CAPACITY)
        flushInternal();
    }
  }

  public void write(Reader reader) throws IOException {
    checkClosed();
    while (true) {
      int n = reader.read(buffer);
      if (n < 0)
        break;
      out.write(buffer, 0, n);
    }
    out.flush();
  }

  public void write(String s) throws IOException {
    write(s, 0, s.length());
  }

  public void write(String s, int offset, int length) throws IOException {
    checkClosed();
    while (length > 0) {
      int n = Math.min(CAPACITY - position, length);
      s.getChars(offset, offset + n, buffer, position);
      position += n;
      offset += n;
      length -= n;
      if (position >= CAPACITY)
        flushInternal();
    }
  }

  public void write(int c) throws IOException {
    checkClosed();
    if (position >= CAPACITY)
      flushInternal();
    buffer[position] = (char) c;
    position++;
  }

  public void flush() throws IOException {
    flushInternal();
    out.flush();
  }

  private void flushInternal() throws IOException {
    if (position != 0) {
      out.write(buffer, 0, position);
      position = 0;
    }
  }

  public void close() throws IOException {
    closed = true;
    this.flush();
    out.close();
  }

  private void checkClosed() throws IOException {
    if (closed)
      throw new IOException("Writer is closed");
  }
}