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package eu.dnetlib.data.utils;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.util.Collection;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.stream.Collectors;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.jbibtex.BibTeXDatabase;
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import org.jbibtex.BibTeXEntry;
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import org.jbibtex.BibTeXFormatter;
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import org.jbibtex.Key;
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import org.jbibtex.StringValue;
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import org.jbibtex.StringValue.Style;
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import eu.dnetlib.data.mdstore.plugins.objects.MdRecord;
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public class BibTexConverter {
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private static final Log log = LogFactory.getLog(BibTexConverter.class);
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public static String asBibTex(final MdRecord record) {
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try {
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final BibTeXEntry dbEntry = new BibTeXEntry(findBibTexType(record.getType()), new Key(record.getId()));
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_TITLE, record.getTitle());
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addMultipleStringValue(dbEntry, BibTeXEntry.KEY_AUTHOR, record.getCreators());
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_PUBLISHER, record.getPublisher());
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addMultipleStringValue(dbEntry, BibTeXEntry.KEY_DOI, record.getDois());
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addSourceAndDate(dbEntry, record);
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final BibTeXFormatter formatter = new BibTeXFormatter();
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final Writer res = new StringWriter();
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final BibTeXDatabase db = new BibTeXDatabase();
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db.addObject(dbEntry);
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formatter.format(db, res);
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return res.toString();
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} catch (final IOException e) {
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log.warn("Error generating bibtex", e);
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return "";
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}
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}
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private static void addSimpleStringValue(final BibTeXEntry dbEntry, final Key key, final Object value) {
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if ((value != null) && StringUtils.isNotBlank(value.toString())) {
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dbEntry.addField(key, new StringValue(value.toString(), Style.BRACED));
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}
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}
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private static void addMultipleStringValue(final BibTeXEntry dbEntry, final Key key, final Collection<String> list) {
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final String val = list.stream()
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.map(String::trim)
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.filter(StringUtils::isNotBlank)
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.collect(Collectors.joining(" and "));
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if (StringUtils.isNotBlank(val)) {
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dbEntry.addField(key, new StringValue(val, Style.BRACED));
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}
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}
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private static void addSourceAndDate(final BibTeXEntry dbEntry, final MdRecord record) {
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String year = Integer.toString(record.getDate());
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if (record.getSource() != null) {
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switch (record.getType().toLowerCase()) {
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case "conference article":
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case "contribution to conference":
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_BOOKTITLE, record.getSource());
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break;
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case "contribution to book":
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_BOOKTITLE, record.getSource());
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break;
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case "report":
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_INSTITUTION, record.getSource());
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break;
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case "journal article":
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final String regex = "^(.+) (\\d*) \\((\\d{4})\\)(: (\\d+\\–?\\d*))?";
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final Pattern pattern = Pattern.compile(regex);
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final Matcher matcher = pattern.matcher(record.getSource());
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if (matcher.find()) {
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if (matcher.groupCount() >= 1) {
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_JOURNAL, matcher.group(1));
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}
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if (matcher.groupCount() >= 2) {
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_VOLUME, matcher.group(2));
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}
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if (matcher.groupCount() >= 3) {
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year = matcher.group(3);
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}
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if (matcher.groupCount() >= 5) {
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_PAGES, matcher.group(5));
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}
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}
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break;
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case "patent":
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_HOWPUBLISHED, record.getSource());
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break;
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}
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}
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addSimpleStringValue(dbEntry, BibTeXEntry.KEY_YEAR, year);
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}
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private static Key findBibTexType(final String resourceType) {
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switch (resourceType.toLowerCase()) {
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case "conference article":
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case "contribution to conference":
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return BibTeXEntry.TYPE_INPROCEEDINGS;
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case "report":
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return BibTeXEntry.TYPE_TECHREPORT;
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case "journal article":
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return BibTeXEntry.TYPE_ARTICLE;
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case "other":
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return BibTeXEntry.TYPE_MISC;
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case "contribution to book":
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return BibTeXEntry.TYPE_INBOOK;
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case "book":
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return BibTeXEntry.TYPE_BOOK;
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case "bachelor thesis":
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return BibTeXEntry.TYPE_MASTERSTHESIS;
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case "doctoral thesis":
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return BibTeXEntry.TYPE_PHDTHESIS;
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case "patent":
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return BibTeXEntry.TYPE_MISC;
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case "master thesis":
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return BibTeXEntry.TYPE_MASTERSTHESIS;
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default:
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return BibTeXEntry.TYPE_MISC;
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}
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}
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}
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