Add Library of Congress as ID-fetcher

CHANGELOG.md

@@ -22,6 +22,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
   - Removed the hidden feature that a double click in the editor inserted the current date.
 - All authors and editors are separated using semicolons when exporting to csv. [#2762](https://github.com/JabRef/jabref/issues/2762)
 - Improved wording of "Show recommendations: into "Show 'Related Articles' tab" in the preferences
+- We added integration of the Library of Congress catalog as a fetcher based on the [LCCN identifier](https://en.wikipedia.org/wiki/Library_of_Congress_Control_Number). [Feature request 636 in the forum](http://discourse.jabref.org/t/loc-marc-mods-connection/636)
 
 ### Fixed
 - We fixed the IEEE Xplore web search functionality [#2789](https://github.com/JabRef/jabref/issues/2789)

src/main/java/org/jabref/logic/importer/WebFetchers.java

@@ -14,6 +14,7 @@
 import org.jabref.logic.importer.fetcher.GoogleScholar;
 import org.jabref.logic.importer.fetcher.GvkFetcher;
 import org.jabref.logic.importer.fetcher.IsbnFetcher;
+import org.jabref.logic.importer.fetcher.LibraryOfCongress;
 import org.jabref.logic.importer.fetcher.MathSciNet;
 import org.jabref.logic.importer.fetcher.MedlineFetcher;
 import org.jabref.logic.importer.fetcher.TitleFetcher;
@@ -88,6 +89,7 @@ public static List<IdBasedFetcher> getIdBasedFetchers(ImportFormatPreferences im
         list.add(new TitleFetcher(importFormatPreferences));
         list.add(new MathSciNet(importFormatPreferences));
         list.add(new CrossRef());
+        list.add(new LibraryOfCongress());
         list.sort(Comparator.comparing(WebFetcher::getName));
         return list;
     }

src/main/java/org/jabref/logic/importer/fetcher/LibraryOfCongress.java

@@ -0,0 +1,34 @@
+package org.jabref.logic.importer.fetcher;
+
+import java.net.MalformedURLException;
+import java.net.URISyntaxException;
+import java.net.URL;
+
+import org.jabref.logic.importer.FetcherException;
+import org.jabref.logic.importer.IdBasedParserFetcher;
+import org.jabref.logic.importer.Parser;
+import org.jabref.logic.importer.fileformat.ModsImporter;
+
+import org.apache.http.client.utils.URIBuilder;
+
+/**
+ * Fetcher for the Library of Congress Control Number (LCCN) using https://lccn.loc.gov/
+ */
+public class LibraryOfCongress implements IdBasedParserFetcher {
+
+    @Override
+    public String getName() {
+        return "Library of Congress";
+    }
+
+    @Override
+    public URL getURLForID(String identifier) throws URISyntaxException, MalformedURLException, FetcherException {
+        URIBuilder uriBuilder = new URIBuilder("https://lccn.loc.gov/" + identifier + "/mods");
+        return uriBuilder.build().toURL();
+    }
+
+    @Override
+    public Parser getParser() {
+        return new ModsImporter();
+    }
+}

src/main/java/org/jabref/logic/importer/fileformat/ModsImporter.java

@@ -2,7 +2,11 @@
 
 import java.io.BufferedReader;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -17,6 +21,8 @@
 import javax.xml.bind.Unmarshaller;
 
 import org.jabref.logic.importer.Importer;
+import org.jabref.logic.importer.ParseException;
+import org.jabref.logic.importer.Parser;
 import org.jabref.logic.importer.ParserResult;
 import org.jabref.logic.importer.fileformat.mods.AbstractDefinition;
 import org.jabref.logic.importer.fileformat.mods.DateDefinition;
@@ -61,7 +67,7 @@
  * More details about the format can be found here <a href="http://www.loc.gov/standards/mods/">http://www.loc.gov/standards/mods/</a>. <br>
  * The newest xml schema can also be found here <a href="www.loc.gov/standards/mods/mods-schemas.html.">www.loc.gov/standards/mods/mods-schemas.html.</a>.
  */
-public class ModsImporter extends Importer {
+public class ModsImporter extends Importer implements Parser {
 
     private static final Log LOGGER = LogFactory.getLog(ModsImporter.class);
     private static final String KEYWORD_SEPARATOR = JabRefPreferences.getInstance().getImportFormatPreferences()
@@ -476,4 +482,13 @@ public String getDescription() {
         return "Importer for the MODS format";
     }
 
+    @Override
+    public List<BibEntry> parseEntries(InputStream inputStream) throws ParseException {
+        try {
+            return importDatabase(new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))).getDatabase().getEntries();
+        } catch (IOException e) {
+            LOGGER.error(e.getLocalizedMessage(), e);
+        }
+        return Collections.emptyList();
+    }
 }

src/test/java/org/jabref/logic/importer/fetcher/LibraryOfCongressTest.java

@@ -0,0 +1,34 @@
+package org.jabref.logic.importer.fetcher;
+
+import java.util.Optional;
+
+import org.jabref.model.entry.BibEntry;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class LibraryOfCongressTest {
+
+    private LibraryOfCongress fetcher = new LibraryOfCongress();
+
+    @Test
+    public void performSearchById() throws Exception {
+        BibEntry expected = new BibEntry();
+        expected.setField("address", "Burlington, MA");
+        expected.setField("author", "West, Matthew");
+        expected.setField("isbn", "0123751063 (pbk.)");
+        expected.setField("issuance", "monographic");
+        expected.setField("keywords", "Database design, Data structures (Computer science)");
+        expected.setField("language", "eng");
+        expected.setField("lccn", "2010045158");
+        expected.setField("note", "Matthew West., Includes index.");
+        expected.setField("oclc", "ocn665135773");
+        expected.setField("publisher", "Morgan Kaufmann");
+        expected.setField("source", "DLC");
+        expected.setField("title", "Developing high quality data models");
+        expected.setField("year", "2011");
+
+        assertEquals(Optional.of(expected), fetcher.performSearchById("2010045158"));
+    }
+}