001/*
002 * JRecordBind, fixed-length file (un)marshaller
003 * Copyright 2019, Federico Fissore, and individual contributors. See
004 * AUTHORS.txt in the distribution for a full listing of individual
005 * contributors.
006 *
007 * This is free software; you can redistribute it and/or modify it
008 * under the terms of the GNU Lesser General Public License as
009 * published by the Free Software Foundation; either version 2.1 of
010 * the License, or (at your option) any later version.
011 *
012 * This software is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this software; if not, write to the Free
019 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021 */
022
023package org.fissore.jrecordbind;
024
025import java.io.IOException;
026import java.io.Reader;
027
028/**
029 * The default {@link LineReader} implementation. It will read all lines from a Reader,
030 * using given line separator to understand when a line ends
031 */
032public class SimpleLineReader implements LineReader {
033
034  public String readLine(Reader reader, Padder defaultPadder, String propertyDelimiter, int recordLength, String lineSeparator) {
035    char[] lineseparatorChars = lineSeparator.toCharArray();
036    int matchedPos = 0;
037    int inInt;
038    char inChar;
039    StringBuilder outLine = new StringBuilder();
040    try {
041      while ((inInt = reader.read()) > 0) {
042        inChar = (char) inInt;
043        outLine.append(inChar);
044        if (inChar == lineseparatorChars[matchedPos]) {
045          matchedPos++;
046          if (matchedPos == lineseparatorChars.length) {
047            // We have a line end
048            return outLine.replace(outLine.length() - lineseparatorChars.length, outLine.length(), "").toString();
049          }
050        } else {
051          if (matchedPos > 0) {
052            matchedPos = 0;
053          }
054        }
055      }
056      if (outLine.length() > 0) {
057        return outLine.toString();
058      }
059      return null;
060    } catch (IOException e) {
061      throw new RuntimeException(e);
062    }
063  }
064
065}