1 files changed, 63 insertions, 0 deletions
diff --git a/src/java/native/ScopedLocalRef.h b/src/java/native/ScopedLocalRef.h
new file mode 100644
index 00000000..71d57767
--- /dev/null
+++ b/src/java/native/ScopedLocalRef.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+#ifndef SCOPED_LOCAL_REF_H_included
+#define SCOPED_LOCAL_REF_H_included
+
+#include "jni.h"
+
+#include <stddef.h>
+
+// A smart pointer that deletes a JNI local reference when it goes out of scope.
+template<typename T>
+class ScopedLocalRef {
+public:
+    ScopedLocalRef(JNIEnv* env, T localRef) : mEnv(env), mLocalRef(localRef) {
+    }
+
+    ~ScopedLocalRef() {
+        reset();
+    }
+
+    void reset(T ptr = NULL) {
+        if (ptr != mLocalRef) {
+            if (mLocalRef != NULL) {
+                mEnv->DeleteLocalRef(mLocalRef);
+            }
+            mLocalRef = ptr;
+        }
+    }
+
+    T release() __attribute__((warn_unused_result)) {
+        T localRef = mLocalRef;
+        mLocalRef = NULL;
+        return localRef;
+    }
+
+    T get() const {
+        return mLocalRef;
+    }
+
+private:
+    JNIEnv* mEnv;
+    T mLocalRef;
+
+    // Disallow copy and assignment.
+    ScopedLocalRef(const ScopedLocalRef&);
+    void operator=(const ScopedLocalRef&);
+};
+
+#endif  // SCOPED_LOCAL_REF_H_included