001/*
002 * Copyright © 2012, 2013, 2014 Royal Botanic Gardens, Kew.
003 *
004 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
005 *
006 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
007 *
008 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
009 */
010package org.kew.rmf.transformers;
011
012import java.util.regex.Matcher;
013import java.util.regex.Pattern;
014
015/**
016 * Extracts year ranges from arbitrary strings.  Example: "12 Feb 1845, 1880-95, 1899-1920, June 1950+" becomes "1845 1880-95 1899-1920 1950+".
017 */
018public class YearRangeExtractorTransformer implements Transformer {
019
020        private final Pattern yearsRegex = Pattern.compile("\\b(1[6789]\\d\\d|20[012]\\d)([–—-]\\b|\\b\\+|\\b)");
021
022        @Override
023        public String transform(String s) {
024                StringBuffer sb = new StringBuffer();
025                if (s != null) {
026                        Matcher m = yearsRegex.matcher(s);
027                        while (m.find()) {
028                                String match = m.group();
029                                match = match.replace('–', '-'); // en-dash
030                                match = match.replace('—', '-'); // em-dash
031                                sb.append(match);
032                                if (!match.endsWith("-")) {
033                                        sb.append(" ");
034                                }
035                        }
036                }
037                return sb.toString().trim();
038        }
039}