Remove java finalizer from Box, provide refCount instead

This makes it consistent with Pix implementation, where finalizer was also removed in rmtheis/tess-two@44627d8

This removes warning "Box was not terminated using recycle()" which was wrongly raised in testPixaReplacePix() test (see rmtheis/tess-two#159 (comment)), but now requires that user don't forget to release his Box instances (same as with Pix).

tesseract4android/src/main/cpp/leptonica/box.cpp

@@ -28,6 +28,13 @@ jlong Java_com_googlecode_leptonica_android_Box_nativeCreate(JNIEnv *env, jclass
   return (jlong) box;
 }
 
+jint Java_com_googlecode_leptonica_android_Box_nativeGetRefCount(JNIEnv *env, jclass clazz,
+                                                                 jlong nativeBox) {
+  BOX *box = (BOX *) nativeBox;
+
+  return (jint) boxGetRefcount(box);
+}
+
 void Java_com_googlecode_leptonica_android_Box_nativeDestroy(JNIEnv *env, jclass clazz,
                                                              jlong nativeBox) {
   BOX *box = (BOX *) nativeBox;

tesseract4android/src/main/java/com/googlecode/leptonica/android/Box.java

@@ -208,6 +208,10 @@ public boolean getGeometry(@Size(min = 4) int[] geometry) {
 		return nativeGetGeometry(mNativeBox, geometry);
 	}
 
+	public int getRefCount() {
+		return nativeGetRefCount(mNativeBox);
+	}
+
 	/**
 	 * Releases resources and frees any memory associated with this Box.
 	 */
@@ -219,18 +223,6 @@ public void recycle() {
 		}
 	}
 
-	@Override
-	protected void finalize() throws Throwable {
-		try {
-			if (!mRecycled) {
-				Log.w(TAG, "Box was not terminated using recycle()");
-				recycle();
-			}
-		} finally {
-			super.finalize();
-		}
-	}
-
 	// ***************
 	// * NATIVE CODE *
 	// ***************
@@ -245,6 +237,8 @@ protected void finalize() throws Throwable {
 
 	private static native int nativeGetHeight(long nativeBox);
 
+	private static native int nativeGetRefCount(long nativePix);
+
 	private static native void nativeDestroy(long nativeBox);
 
 	private static native boolean nativeGetGeometry(long nativeBox, int[] geometry);