Add and use native feature detection API.

Author: greenrobot-team

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

@@ -16,6 +16,7 @@
 
 package io.objectbox;
 
+import io.objectbox.internal.Feature;
 import org.greenrobot.essentials.collections.LongHashMap;
 
 import java.io.Closeable;
@@ -186,34 +187,28 @@ static native void nativeRegisterCustomType(long store, int entityId, int proper
 
     static native long nativeSysProcStatusKb(String key);
 
-    /** @return sync availability (0: none; 1: client; 2: server) */
-    static native int nativeGetSupportedSync();
+    private static native boolean nativeHasFeature(int feature);
 
-    public static boolean isObjectBrowserAvailable() {
-        NativeLibraryLoader.ensureLoaded();
-        return nativeIsObjectBrowserAvailable();
-    }
-
-    private static int getSupportedSync() {
-        NativeLibraryLoader.ensureLoaded();
+    public static boolean hasFeature(Feature feature) {
         try {
-            int supportedSync = nativeGetSupportedSync();
-            if (supportedSync < 0 || supportedSync > 2) {
-                throw new IllegalStateException("Unexpected sync support: " + supportedSync);
-            }
-            return supportedSync;
+            NativeLibraryLoader.ensureLoaded();
+            return nativeHasFeature(feature.id);
         } catch (UnsatisfiedLinkError e) {
             System.err.println("Old JNI lib? " + e);  // No stack
-            return 0;
+            return false;
         }
     }
 
+    public static boolean isObjectBrowserAvailable() {
+        return hasFeature(Feature.ADMIN);
+    }
+
     public static boolean isSyncAvailable() {
-        return getSupportedSync() != 0;
+        return hasFeature(Feature.SYNC);
     }
 
     public static boolean isSyncServerAvailable() {
-        return getSupportedSync() == 2;
+        return hasFeature(Feature.SYNC_SERVER);
     }
 
     native long nativePanicModeRemoveAllObjects(long store, int entityId);

objectbox-java/src/main/java/io/objectbox/internal/Feature.java

@@ -0,0 +1,34 @@
+package io.objectbox.internal;
+
+/**
+ * Use with {@link io.objectbox.BoxStore#hasFeature(Feature)}.
+ */
+public enum Feature {
+
+    /** Internal feature, not relevant if using ObjectBox through JNI. */
+    RESULT_ARRAY(1),
+
+    /** TimeSeries support (date/date-nano companion ID and other time-series functionality). */
+    TIME_SERIES(2),
+
+    /** Sync client availability. Visit https://objectbox.io/sync for more details. */
+    SYNC(3),
+
+    /** Check whether debug log can be enabled during runtime. */
+    DEBUG_LOG(4),
+
+    /** HTTP server with a database browser. */
+    ADMIN(5),
+
+    /** Trees & GraphQL support */
+    TREES(6),
+
+    /** Embedded Sync server availability. */
+    SYNC_SERVER(7);
+
+    public int id;
+
+    Feature(int id) {
+        this.id = id;
+    }
+}