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.padders; 024 025import org.fissore.jrecordbind.Padder; 026 027public abstract class AbstractPadder implements Padder { 028 029 protected final char padChar; 030 031 public AbstractPadder(char padChar) { 032 this.padChar = padChar; 033 } 034 035 protected String buildPad(String string, int totalLength) { 036 int lengthOfString = lengthOf(string); 037 // PITEST note: the following conditional will generate a surviving mutation. 038 // That's because it's just an optimization to avoid creating a StringBuilder 039 // So the code works even if the `if` is removed/negated, it'll just be slower 040 int padSize = totalLength - lengthOfString; 041 if (padSize <= 0) { 042 return ""; 043 } 044 StringBuilder sb = new StringBuilder(padSize); 045 while (padSize-- > 0) { 046 sb.append(padChar); 047 } 048 return sb.toString(); 049 } 050 051 private int lengthOf(String string) { 052 if (string == null) { 053 return 0; 054 } 055 return string.length(); 056 } 057 058}