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}