find single long and int

Author: greenrobot

objectbox-java/src/main/java/io/objectbox/query/PropertyQuery.java

@@ -153,7 +153,7 @@ public int[] findInts() {
             @Override
             public int[] call() {
                 return query.nativeFindInts(query.handle, query.cursorHandle(), property.id, distinct,
-                        enableNull, (int)nullValueLong);
+                        enableNull, (int) nullValueLong);
             }
         });
     }
@@ -251,4 +251,31 @@ public double[] call() {
         });
     }
 
+    private Object findNumber(final boolean unique) {
+        return query.callInReadTx(new Callable<Object>() {
+            @Override
+            public Object call() {
+                return query.nativeFindNumber(query.handle, query.cursorHandle(), property.id, unique,
+                        enableNull, nullValueLong, nullValueFloat, nullValueDouble);
+            }
+        });
+    }
+
+    public Long findFirstLong() {
+        return (Long) findNumber(false);
+    }
+
+    public Long findUniqueLong() {
+        return (Long) findNumber(true);
+    }
+
+
+    public Integer findFirstInt() {
+        return (Integer) findNumber(false);
+    }
+
+    public Integer findUniqueInt() {
+        return (Integer) findNumber(true);
+    }
+
 }

objectbox-java/src/main/java/io/objectbox/query/Query.java

@@ -83,6 +83,9 @@ native float[] nativeFindFloats(long handle, long cursorHandle, int propertyId,
     native double[] nativeFindDoubles(long handle, long cursorHandle, int propertyId, boolean distinct,
                                       boolean enableNull, double nullValue);
 
+    native Object nativeFindNumber(long handle, long cursorHandle, int propertyId, boolean unique, boolean enableNull,
+                                   long nullValue, float nullValueFloat, double nullValueDouble);
+
     native long nativeCount(long handle, long cursorHandle);
 
     native long nativeSum(long handle, long cursorHandle, int propertyId);

tests/objectbox-java-test/src/main/java/io/objectbox/query/PropertyQueryTest.java

@@ -148,6 +148,42 @@ public void testFindLongs() {
         assertEquals(1, query.property(simpleLong).distinct().findLongs().length);
     }
 
+    @Test
+    public void testFindLong() {
+        putTestEntities(5);
+        Query<TestEntity> query = box.query().greater(simpleLong, 1002).build();
+        long result = query.property(simpleLong).findFirstLong();
+        assertEquals(1003, result);
+
+        query = box.query().greater(simpleLong, 1004).build();
+        assertEquals(1005, (long) query.property(simpleLong).distinct().findUniqueLong());
+    }
+
+    @Test()
+    public void testFindLong_uniqueFails() {
+        putTestEntity(null, 1);
+        putTestEntity(null, 1);
+        box.query().build().property(simpleLong).findUniqueLong();
+    }
+
+    @Test
+    public void testFindInt() {
+        putTestEntities(5);
+        Query<TestEntity> query = box.query().greater(simpleLong, 1002).build();
+        long result = query.property(simpleInt).findFirstInt();
+        assertEquals(3, result);
+
+        query = box.query().greater(simpleLong, 1004).build();
+        assertEquals(5, (long) query.property(simpleInt).distinct().findUniqueInt());
+    }
+
+    @Test()
+    public void testFindInt_uniqueFails() {
+        putTestEntity(null, 1);
+        putTestEntity(null, 1);
+        box.query().build().property(simpleInt).findUniqueInt();
+    }
+
     @Test
     public void testFindInts() {
         putTestEntities(5);