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    
020    package org.crsh.telnet.term.console;
021    
022    import org.crsh.telnet.term.spi.TermIO;
023    
024    import java.io.IOException;
025    
026    /**
027     * Wraps {@link TermIO} and care about CRLF.
028     */
029    public 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    }