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
025public abstract class AbstractLeftPadder extends AbstractPadder {
026
027  public AbstractLeftPadder(char padChar) {
028    super(padChar);
029  }
030
031  public String pad(String input, int totalLength) {
032    if (input == null) {
033      return buildPad(null, totalLength);
034    }
035    return buildPad(input, totalLength) + input;
036  }
037
038  public String unpad(String input) {
039    if (input == null || input.isEmpty()) {
040      return "";
041    }
042
043    int inputIdx = 0;
044    while (inputIdx < input.length() && input.charAt(inputIdx) == padChar) {
045      inputIdx++;
046    }
047
048    return input.substring(inputIdx);
049  }
050}