Add a title guess method to get "better" title

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

@@ -5,6 +5,7 @@
 import java.io.StringWriter;
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
 import java.util.Objects;
@@ -208,6 +209,70 @@ public ParserResult importDatabase(Path filePath) {
         return new ParserResult(result);
     }
 
+    private String guessBetterTitleInMetaData(List<String> metadata) {
+        String probableTitle = null;
+        int maxScore = 0;
+
+        for (String str : metadata) {
+            if (str == null) {
+                continue;
+            }
+            // Rule 1: Check for file type paths, ignore them
+            if (str.contains(".pdf") || str.contains(".docx") || str.contains(".doc")) {
+                continue;
+            }
+            // Rule 2: Abstract detection (too long for a title)
+            if (str.length() > 300) {
+                continue;
+            }
+            // Rule 3: Title length and academic keywords (heuristic)
+            int score = 0;
+            score += str.length(); // Titles tend to be longer
+            score += countAcademicKeywords(str); // Bonus for academic terms
+
+            if (score > maxScore) {
+                maxScore = score;
+                probableTitle = str;
+            }
+        }
+
+        return probableTitle;
+    }
+
+    // Count common academic keywords
+    private int countAcademicKeywords(String str) {
+        List<String> keywords = Arrays.asList("study", "exploring", "research", "development", "design", "learning");
+        int count = 0;
+        for (String keyword : keywords) {
+            if (str.toLowerCase().contains(keyword)) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    private List<String> buildMetaData(
+            String author, String editor, String abstractT, String keywords, String title,
+            String conference, String doi, String series, String volume, String number,
+            String pages, String year, String publisher) {
+        List<String> metadataList = new ArrayList<>();
+        metadataList.add(author);
+        metadataList.add(editor);
+        metadataList.add(abstractT);
+        metadataList.add(keywords);
+        metadataList.add(title);
+        metadataList.add(conference);
+        metadataList.add(doi);
+        metadataList.add(series);
+        metadataList.add(volume);
+        metadataList.add(number);
+        metadataList.add(pages);
+        metadataList.add(year);
+        metadataList.add(publisher);
+
+        return metadataList;
+    }
+
     // make this method package visible so we can test it
     Optional<BibEntry> getEntryFromPDFContent(String firstpageContents, String lineSeparator) {
         // idea: split[] contains the different lines
@@ -437,6 +502,7 @@ Optional<BibEntry> getEntryFromPDFContent(String firstpageContents, String lineS
             entry.setField(StandardField.KEYWORDS, keywords);
         }
         if (title != null) {
+            title = guessBetterTitleInMetaData(buildMetaData(author, editor, abstractT, keywords, title, conference, doi, series, volume, number, pages, year, publisher));
             entry.setField(StandardField.TITLE, title);
         }
         if (conference != null) {

src/test/java/org/jabref/logic/importer/fileformat/PdfContentImporterTest.java

@@ -2,6 +2,7 @@
 
 import java.nio.file.Path;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 
 import org.jabref.model.entry.BibEntry;
@@ -15,7 +16,7 @@
 
 class PdfContentImporterTest {
 
-    private PdfContentImporter importer = new PdfContentImporter();
+    private final PdfContentImporter importer = new PdfContentImporter();
 
     @Test
     void doesNotHandleEncryptedPdfs() throws Exception {
@@ -123,4 +124,11 @@ British Journal of Nutrition (2008), 99, 1–11 doi: 10.1017/S0007114507795296
 
         assertEquals(Optional.of(entry), importer.getEntryFromPDFContent(firstPageContent, "\n"));
     }
+
+    @Test
+    void se2Pdfs() throws Exception {
+        Path file = Path.of(Objects.requireNonNull(PdfContentImporter.class.getResource("/pdfs/se2paper.pdf")).toURI());
+        List<BibEntry> result = importer.importDatabase(file).getDatabase().getEntries();
+        assertEquals("On How and We Can and Teach  and Exploring New and Ways in  and Professional Software and Development for Students", result.getFirst().getTitle().orElse(""));
+    }
 }