Add confirmation dialog for empty entries in JabRef

CHANGELOG.md

@@ -11,6 +11,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Added
 
+- We added confirmation dialog when user wants to close a library where any empty entires are detected. [#8096](https://github.com/JabRef/jabref/issues/8096)
 - We added import support for CFF files. [#7945](https://github.com/JabRef/jabref/issues/7945)
 - We added the option to copy the DOI of an entry directly from the context menu copy submenu. [#7826](https://github.com/JabRef/jabref/issues/7826)
 - We added a fulltext search feature. [#2838](https://github.com/JabRef/jabref/pull/2838)

src/main/java/org/jabref/gui/JabRefFrame.java

@@ -137,6 +137,7 @@
 import org.jabref.logic.undo.UndoRedoEvent;
 import org.jabref.logic.util.OS;
 import org.jabref.model.database.BibDatabaseContext;
+import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.field.SpecialField;
 import org.jabref.model.entry.types.StandardEntryType;
 import org.jabref.preferences.PreferencesService;
@@ -398,6 +399,12 @@ public boolean quit() {
             LibraryTab libraryTab = getLibraryTabAt(i);
             final BibDatabaseContext context = libraryTab.getBibDatabaseContext();
 
+            if (context.hasEmptyEntries()) {
+                if (!confirmEmptyEntry(libraryTab, context)) {
+                    return false;
+                }
+            }
+
             if (libraryTab.isModified() && (context.getLocation() == DatabaseLocation.LOCAL)) {
                 tabbedPane.getSelectionModel().select(i);
                 if (!confirmClose(libraryTab)) {
@@ -1164,13 +1171,60 @@ private boolean confirmClose(LibraryTab libraryTab) {
         return response.isEmpty() || !response.get().equals(cancel);
     }
 
+    /**
+     * Ask if the user really wants to remove any empty entries
+     */
+    private Boolean confirmEmptyEntry(LibraryTab libraryTab, BibDatabaseContext context) {
+        String filename = libraryTab.getBibDatabaseContext()
+                                    .getDatabasePath()
+                                    .map(Path::toAbsolutePath)
+                                    .map(Path::toString)
+                                    .orElse(Localization.lang("untitled"));
+
+        ButtonType deleteEmptyEntries = new ButtonType(Localization.lang("Delete empty entries"), ButtonBar.ButtonData.YES);
+        ButtonType keepEmptyEntries = new ButtonType(Localization.lang("Keep empty entries"), ButtonBar.ButtonData.NO);
+        ButtonType cancel = new ButtonType(Localization.lang("Return to JabRef"), ButtonBar.ButtonData.CANCEL_CLOSE);
+
+        Optional<ButtonType> response = dialogService.showCustomButtonDialogAndWait(Alert.AlertType.CONFIRMATION,
+                Localization.lang("Empty entries"),
+                Localization.lang("Library '%0' has empty entries. Do you want to delete them?", filename),
+                deleteEmptyEntries, keepEmptyEntries, cancel);
+        if (response.isPresent() && response.get().equals(deleteEmptyEntries)) {
+            // The user wants to delete.
+            try {
+                for (BibEntry currentEntry : new ArrayList<BibEntry>(context.getEntries())) {
+                    if (currentEntry.getFields().isEmpty()) {
+                        context.getDatabase().removeEntries(Collections.singletonList(currentEntry));
+                    }
+                }
+                SaveDatabaseAction saveAction = new SaveDatabaseAction(libraryTab, prefs, Globals.entryTypesManager);
+                if (saveAction.save()) {
+                    return true;
+                }
+                // The action was either canceled or unsuccessful.
+                dialogService.notify(Localization.lang("Unable to save library"));
+            } catch (Throwable ex) {
+                LOGGER.error("A problem occurred when trying to delete the empty entries", ex);
+                dialogService.showErrorDialogAndWait(Localization.lang("Delete empty entries"), Localization.lang("Could not delete empty entries."), ex);
+            }
+            // Save was cancelled or an error occurred.
+            return false;
+        }
+        return !response.get().equals(cancel);
+    }
+
     private void closeTab(LibraryTab libraryTab) {
         // empty tab without database
         if (libraryTab == null) {
             return;
         }
 
         final BibDatabaseContext context = libraryTab.getBibDatabaseContext();
+        if (context.hasEmptyEntries()) {
+            if (!confirmEmptyEntry(libraryTab, context)) {
+                return;
+            }
+        }
 
         if (libraryTab.isModified() && (context.getLocation() == DatabaseLocation.LOCAL)) {
             if (confirmClose(libraryTab)) {

src/main/java/org/jabref/model/database/BibDatabaseContext.java

@@ -213,6 +213,14 @@ public List<BibEntry> getEntries() {
         return database.getEntries();
     }
 
+    /**
+     * check if the database has any empty entries
+     * @return true if the database has any empty entries; otherwise false
+     */
+    public boolean hasEmptyEntries() {
+        return this.getEntries().stream().anyMatch(entry->entry.getFields().isEmpty());
+    }
+
     public static Path getFulltextIndexBasePath() {
         return Path.of(AppDirsFactory.getInstance().getUserDataDir(SEARCH_INDEX_BASE_PATH, SearchFieldConstants.VERSION, "org.jabref"));
     }

src/main/resources/l10n/JabRef_en.properties

@@ -1,3 +1,13 @@
+Could\ not\ delete\ empty\ entries.=Could not delete empty entries.
+
+Delete\ empty\ entries=Delete empty entries
+
+Empty\ entries=Empty entries
+
+Keep\ empty\ entries=Keep empty entries
+
+Library\ '%0'\ has\ empty\ entries.\ Do\ you\ want\ to\ delete\ them?=Library '%0' has empty entries. Do you want to delete them?
+
 Unable\ to\ monitor\ file\ changes.\ Please\ close\ files\ and\ processes\ and\ restart.\ You\ may\ encounter\ errors\ if\ you\ continue\ with\ this\ session.=Unable to monitor file changes. Please close files and processes and restart. You may encounter errors if you continue with this session.
 %0\ contains\ the\ regular\ expression\ <b>%1</b>=%0 contains the regular expression <b>%1</b>
 

src/test/java/org/jabref/model/database/BibDatabaseTest.java

@@ -16,6 +16,7 @@
 import org.jabref.model.entry.field.UnknownField;
 import org.jabref.model.entry.types.StandardEntryType;
 import org.jabref.model.event.TestEventListener;
+import org.jabref.model.metadata.MetaData;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -36,6 +37,23 @@ void setUp() {
         database = new BibDatabase();
     }
 
+    @Test
+    void noEmptyEntry() {
+        BibEntry entry = new BibEntry();
+        entry.setField(StandardField.AUTHOR, "#AAA#");
+        database.insertEntry(entry);
+        BibDatabaseContext bibDatabaseContext = new BibDatabaseContext(database, new MetaData());
+        assertEquals(false, bibDatabaseContext.hasEmptyEntries());
+    }
+
+    @Test
+    void withEmptyEntry() {
+        BibEntry entry = new BibEntry();
+        database.insertEntry(entry);
+        BibDatabaseContext bibDatabaseContext = new BibDatabaseContext(database, new MetaData());
+        assertEquals(true, bibDatabaseContext.hasEmptyEntries());
+    }
+
     @Test
     void insertEntryAddsEntryToEntriesList() {
         BibEntry entry = new BibEntry();