Refactor VirtualLightRefBase & JNI

Change-Id: I8e244e7109e59d5be96871b23bb9b1201c7f9eaa

core/java/com/android/internal/util/VirtualRefBasePtr.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.util;
+
+/**
+ * Helper class that contains a strong reference to a VirtualRefBase native
+ * object. This will incStrong in the ctor, and decStrong in the finalizer
+ */
+public final class VirtualRefBasePtr {
+    private long mNativePtr;
+
+    public VirtualRefBasePtr(long ptr) {
+        mNativePtr = ptr;
+        nIncStrong(mNativePtr);
+    }
+
+    public long get() {
+        return mNativePtr;
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        try {
+            nDecStrong(mNativePtr);
+            mNativePtr = 0;
+        } finally {
+            super.finalize();
+        }
+    }
+
+    private static native void nIncStrong(long ptr);
+    private static native void nDecStrong(long ptr);
+}