001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020package org.crsh.telnet.term.console;
021
022import org.crsh.telnet.term.spi.TermIO;
023
024import java.io.IOException;
025
026/**
027 * Wraps {@link TermIO} and care about CRLF.
028 */
029public class TermIOWriter {
030
031  /** . */
032  private boolean previousCR;
033
034  /** . */
035  private final TermIO io;
036
037  public TermIOWriter(TermIO io) {
038    this.io = io;
039  }
040
041  /**
042   * Write a char sequence to the output.
043   *
044   * @param s the char sequence
045   * @throws IOException any io exception
046   */
047  public void write(CharSequence s) throws IOException {
048    int len = s.length();
049    if (len > 0) {
050      for (int i = 0;i < len;i++) {
051        char c = s.charAt(i);
052        writeNoFlush(c);
053      }
054    }
055  }
056
057  /**
058   * Write a single char to the output.
059   *
060   * @param c the char to write
061   * @throws IOException any io exception
062   */
063  public void write(char c) throws IOException {
064    writeNoFlush(c);
065  }
066
067  private void writeNoFlush(char c) throws IOException {
068    if (previousCR && c == '\n') {
069      previousCR = false;
070    } else if (c == '\r' || c == '\n') {
071      previousCR = c == '\r';
072      io.writeCRLF();
073    } else {
074      io.write(c);
075    }
076  }
077}