1 files changed, 69 insertions, 0 deletions
diff --git a/src/com/android/contacts/common/util/WeakAsyncTask.java b/src/com/android/contacts/common/util/WeakAsyncTask.java
new file mode 100644
index 00000000..f46e5142
--- /dev/null
+++ b/src/com/android/contacts/common/util/WeakAsyncTask.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2009 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.contacts.common.util;
+
+import android.os.AsyncTask;
+
+import java.lang.ref.WeakReference;
+
+public abstract class WeakAsyncTask<Params, Progress, Result, WeakTarget> extends
+        AsyncTask<Params, Progress, Result> {
+    protected WeakReference<WeakTarget> mTarget;
+
+    public WeakAsyncTask(WeakTarget target) {
+        mTarget = new WeakReference<WeakTarget>(target);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected final void onPreExecute() {
+        final WeakTarget target = mTarget.get();
+        if (target != null) {
+            this.onPreExecute(target);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected final Result doInBackground(Params... params) {
+        final WeakTarget target = mTarget.get();
+        if (target != null) {
+            return this.doInBackground(target, params);
+        } else {
+            return null;
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected final void onPostExecute(Result result) {
+        final WeakTarget target = mTarget.get();
+        if (target != null) {
+            this.onPostExecute(target, result);
+        }
+    }
+
+    protected void onPreExecute(WeakTarget target) {
+        // No default action
+    }
+
+    protected abstract Result doInBackground(WeakTarget target, Params... params);
+
+    protected void onPostExecute(WeakTarget target, Result result) {
+        // No default action
+    }
+}