Remove OAI2Fetcher (#4140)

* Remove OAI2Fetcher

* Remove obsolete language keys

Author: tobiasdiez

src/main/java/org/jabref/gui/importer/fetcher/EntryFetcher.java

@@ -12,7 +12,7 @@
  * Use {@link SearchBasedEntryFetcher} instead <br>
  * Implement this interface to add another activeFetcher (something that grabs records
  * from the Web for JabRef). Have a look at the existing implemenations
- * OAI2Fetcher, IEEEXploreFetcher, JStorFetcher and
+ * IEEEXploreFetcher, JStorFetcher and
  * CiteSeerEntryFetcher.
  *
  * Note: You also need to implement the method stopFetching from

src/main/java/org/jabref/gui/importer/fetcher/EntryFetchers.java

@@ -15,7 +15,6 @@ public class EntryFetchers {
     public EntryFetchers(JournalAbbreviationLoader abbreviationLoader) {
         entryFetchers.add(new CiteSeerXFetcher());
         entryFetchers.add(new IEEEXploreFetcher(abbreviationLoader));
-        // entryFetchers.add(new OAI2Fetcher()); - new arXiv fetcher in place, see below
 
         WebFetchers.getSearchBasedFetchers(Globals.prefs.getImportFormatPreferences()).stream()
                 .map(SearchBasedEntryFetcher::new)

src/main/java/org/jabref/gui/importer/fetcher/OAI2Fetcher.java

@@ -23,7 +23,6 @@
 import org.jabref.logic.importer.IdFetcher;
 import org.jabref.logic.importer.ImportFormatPreferences;
 import org.jabref.logic.importer.SearchBasedFetcher;
-import org.jabref.logic.importer.util.OAI2Handler;
 import org.jabref.logic.util.io.XMLUtil;
 import org.jabref.logic.util.strings.StringSimilarity;
 import org.jabref.model.entry.BibEntry;
@@ -297,7 +296,7 @@ public ArXivEntry(Node item) {
 
             // Title of the article
             // The result from the arXiv contains hard line breaks, try to remove them
-            title = XMLUtil.getNodeContent(item, "title").map(OAI2Handler::correctLineBreaks);
+            title = XMLUtil.getNodeContent(item, "title").map(ArXivEntry::correctLineBreaks);
 
             // The url leading to the abstract page
             urlAbstractPage = XMLUtil.getNodeContent(item, "id");
@@ -306,8 +305,8 @@ public ArXivEntry(Node item) {
             publishedDate = XMLUtil.getNodeContent(item, "published");
 
             // Abstract of the article
-            abstractText = XMLUtil.getNodeContent(item, "summary").map(OAI2Handler::correctLineBreaks)
-                    .map(String::trim);
+            abstractText = XMLUtil.getNodeContent(item, "summary").map(ArXivEntry::correctLineBreaks)
+                                  .map(String::trim);
 
             // Authors of the article
             authorNames = new ArrayList<>();
@@ -351,6 +350,12 @@ public ArXivEntry(Node item) {
                     .flatMap(node -> XMLUtil.getAttributeContent(node, "term"));
         }
 
+        public static String correctLineBreaks(String s) {
+            String result = s.replaceAll("\\n(?!\\s*\\n)", " ");
+            result = result.replaceAll("\\s*\\n\\s*", "\n");
+            return result.replaceAll(" {2,}", " ").replaceAll("(^\\s*|\\s+$)", "");
+        }
+
         /**
          * Returns the url of the linked pdf
          */