A PrintWriter that ends lines with a carriage return-line feed (CRLF). : PrintWriter « File « Java Tutorial

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This 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; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;

/**
 * A <tt>PrintWriter</tt> that ends lines with a carriage return-line feed (<tt>CRLF</tt>).
 * 
 * <h3>Concurrency</h3>
 * This class is <b>as</b> synchronized as <tt>PrintWriter</tt>.
 * 
 * @version <tt>$Revision: 1958 $</tt>
 * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
 */
public class CRLFPrintWriter extends PrintWriter {
  protected boolean autoFlush = false;

  public CRLFPrintWriter(final Writer out) {
    super(out);
  }

  public CRLFPrintWriter(final Writer out, final boolean autoFlush) {
    super(out, autoFlush);
    this.autoFlush = autoFlush;
  }

  public CRLFPrintWriter(final OutputStream out) {
    super(out);
  }

  public CRLFPrintWriter(final OutputStream out, final boolean autoFlush) {
    super(out, autoFlush);
    this.autoFlush = autoFlush;
  }

  protected void ensureOpen() throws IOException {
    if (out == null)
      throw new IOException("Stream closed");
  }

  public void println() {
    try {
      synchronized (lock) {
        ensureOpen();

        out.write("\r\n");

        if (autoFlush) {
          out.flush();
        }
      }
    } catch (InterruptedIOException e) {
      Thread.currentThread().interrupt();
    } catch (IOException e) {
      setError();
    }
  }
}