BitSetReadOnlyUnbackedObservableList should implement indexOf

controlsfx/src/main/java/org/controlsfx/control/CheckBitSetModelBase.java

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2013, 2022, ControlsFX
+ * Copyright (c) 2013, 2024, ControlsFX
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -344,6 +344,43 @@ public BitSetReadOnlyUnbackedObservableList(BitSet bitset) {
             return -1;
         }
 
+        @Override public int indexOf(Object obj) {
+            if (!(obj instanceof Number)) {
+                return -1;
+            }
+            Number n = (Number) obj;
+            int index = n.intValue();
+            if (!bitset.get(index)) {
+                return -1;
+            }
+
+            // is left most bit
+            if (index == 0) {
+                return 0;
+            }
+
+            // is right most bit
+            if (index == bitset.length() - 1) {
+                return size() - 1;
+            }
+
+            // count right bit
+            if (index > bitset.length() / 2) {
+                int count = 1;
+                for (int i = bitset.nextSetBit(index+1); i >= 0; i = bitset.nextSetBit(i+1)) {
+                    count++;
+                }
+                return size() - count;
+            }
+
+            // count left bit
+            int count = 0;
+            for (int i = bitset.previousSetBit(index-1);  i >= 0; i = bitset.previousSetBit(i-1)) {
+                count++;
+            }
+            return count;
+        }
+
         @Override public int size() {
             return bitset.cardinality();
         }

controlsfx/src/test/java/org/controlsfx/control/CheckBitSetModelBaseTest.java

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2022, ControlsFX
+ * Copyright (c) 2022, 2024, ControlsFX
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,7 +31,6 @@
 import javafx.collections.ListChangeListener;
 import javafx.collections.ObservableList;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 
 import java.util.HashMap;
@@ -40,6 +39,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
 
 public class CheckBitSetModelBaseTest {
@@ -139,4 +139,14 @@ public void testClearChecksCallsListenerOnce() {
         model.clearChecks();
         assertEquals(1, count.get());
     }
+
+    @Test
+    // needs junit 5
+    // @RepeatedTest(value = 10, failureThreshold = 2)
+    public void testSingleCheckAddsItToIndicesList() {
+        ObservableList<Integer> checkedIndicesList = model.getCheckedIndices();
+        assertTrue(checkedIndicesList.isEmpty());
+        model.check(ROW_3_VALUE);
+        assertNotEquals(-1, checkedIndicesList.indexOf(model.getItemIndex(ROW_3_VALUE)));
+    }
 }