Merge branch 'dev-minor' into dev

Author: greenrobot

README.md

@@ -20,8 +20,9 @@ Other languages/bindings
 ObjectBox is a multi platform database supporting multiple language.
 Besides JVM based languages like Java and Kotlin, ObjectBox also offers: 
 
+* [ObjectBox Swift](https://github.com/objectbox/objectbox-swift): build fast mobile apps for iOS (and macOS) 
+* [ObjectBox Go](https://github.com/objectbox/objectbox-go): great for data-driven tools and small server applications 
 * [ObjectBox C API](https://github.com/objectbox/objectbox-c): native speed with zero copy access to FlatBuffer objects
-* ObjectBox Swift: [coming soon](https://objectbox.io/ios-alpha/)
 
 Gradle setup
 ------------
@@ -68,13 +69,12 @@ For details please check the [docs](http://objectbox.io/documentation/).
 
 Links
 -----
-[Features](http://objectbox.io/features/)
+[Features](https://objectbox.io/features/)
 
-[Documentation](http://objectbox.io/documentation/)
+[Docs & Changelog](https://docs.objectbox.io/)
 
 [Examples](https://github.com/objectbox/objectbox-examples)
 
-[Changelog](http://objectbox.io/changelog/)
 
 We love to get your feedback
 ----------------------------

objectbox-java/src/main/java/io/objectbox/Box.java

@@ -294,6 +294,11 @@ public long count(long maxCount) {
         }
     }
 
+    /** Returns true if no objects are in this box. */
+    public boolean isEmpty() {
+        return count(1) == 0;
+    }
+
     @Temporary
     public List<T> find(Property property, String value) {
         Cursor<T> reader = getReader();
@@ -580,11 +585,6 @@ public void attach(T entity) {
         }
     }
 
-    // Sketching future API extension
-    private boolean isEmpty() {
-        return false;
-    }
-
     // Sketching future API extension
     private boolean isChanged(T entity) {
         return false;

tests/objectbox-java-test/src/test/java/io/objectbox/BoxTest.java

@@ -251,4 +251,20 @@ public void testGetId() {
         assertEquals(entity.getId(), box.getId(entity));
     }
 
+    @Test
+    public void testCountMaxAndIsEmpty() {
+        assertTrue(box.isEmpty());
+        putTestEntity("banana", 0);
+        assertFalse(box.isEmpty());
+
+        assertEquals(1, box.count(1));
+        assertEquals(1, box.count(2));
+        putTestEntity("apple", 0);
+        assertEquals(2, box.count(2));
+        assertEquals(2, box.count(3));
+
+        box.removeAll();
+        assertTrue(box.isEmpty());
+    }
+
 }