001 /* 002 003 Copyright (C) 2001 Laurent Martelli 004 005 This program is free software; you can redistribute it and/or modify 006 it under the terms of the GNU Lesser General Public License as 007 published by the Free Software Foundation; either version 2 of the 008 License, or (at your option) any later version. 009 010 This program is distributed in the hope that it will be useful, 011 but WITHOUT ANY WARRANTY; without even the implied warranty of 012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 013 GNU Lesser General Public License for more details. 014 015 You should have received a copy of the GNU Lesser General Public License 016 along with this program; if not, write to the Free Software 017 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ 018 019 package org.objectweb.jac.util; 020 021 import java.io.FilterWriter; 022 import java.io.Writer; 023 import java.io.IOException; 024 025 /** 026 * A writer which counts the numbers of lines that it writes. 027 * 028 * @see #getLines() 029 */ 030 031 public class LineNumberWriter extends FilterWriter 032 { 033 // last read byte 034 int last = -1; 035 int lines = 1; 036 037 public LineNumberWriter(Writer out) { 038 super(out); 039 } 040 041 public void write(int b) throws IOException { 042 if ( (b == '\r' && last != '\n') || 043 (b=='\n') ) { 044 lines++; 045 } 046 out.write(b); 047 last = b; 048 } 049 050 public void write(char[] b, int off, int len) throws IOException 051 { 052 while (len-- > 0) { 053 write(b[off++]); 054 } 055 } 056 057 public void write(String str, int off, int len) throws IOException 058 { 059 while (len-- > 0) { 060 write(str.charAt(off++)); 061 } 062 } 063 064 /** 065 * Returns the number of lines written 066 */ 067 public int getLines() { 068 return lines; 069 } 070 } 071