001/*
002 * Copyright 2021 Global Biodiversity Information Facility (GBIF)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.gbif.utils.text;
017
018import java.util.Comparator;
019
020/**
021 * A comparator based around Javas String.compareTo().
022 */
023public class StringComparator implements Comparator<String> {
024
025  @Override
026  public int compare(String arg0, String arg1) {
027    if (arg0 == null && arg1 == null) {
028      return 0;
029    } else if (arg0 == null) {
030      return 1;
031    } else if (arg1 == null) {
032      return -1;
033    }
034    return arg0.compareTo(arg1);
035  }
036
037}