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}