1 files changed, 120 insertions, 0 deletions
diff --git a/src/com/android/browser/CrashRecoveryHandler.java b/src/com/android/browser/CrashRecoveryHandler.java
new file mode 100644
index 0000000..9e98e76
--- /dev/null
+++ b/src/com/android/browser/CrashRecoveryHandler.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2011 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.browser;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Debug;
+import android.os.Parcel;
+import android.util.Log;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+
+public class CrashRecoveryHandler {
+
+    private static final String LOGTAG = "BrowserCrashRecovery";
+    private static final String STATE_FILE = "browser_state.parcel";
+    private static final int BUFFER_SIZE = 4096;
+
+    private Controller mController;
+
+    public CrashRecoveryHandler(Controller controller) {
+        mController = controller;
+    }
+
+    public void backupState() {
+        final Bundle state = new Bundle();
+        mController.onSaveInstanceState(state);
+        final Context context = mController.getActivity();
+        new Thread() {
+            @Override
+            public void run() {
+                Parcel p = Parcel.obtain();
+                try {
+                    state.writeToParcel(p, 0);
+                    FileOutputStream fout = context.openFileOutput(STATE_FILE,
+                            Context.MODE_PRIVATE);
+                    fout.write(p.marshall());
+                    fout.close();
+                } catch (Exception e) {
+                    Log.i(LOGTAG, "Failed to save persistent state", e);
+                } finally {
+                    p.recycle();
+                }
+            }
+        }.start();
+    }
+
+    public void clearState() {
+        Context context = mController.getActivity();
+        context.deleteFile(STATE_FILE);
+    }
+
+    public void promptToRecover(final Bundle state, final Intent intent) {
+        new AlertDialog.Builder(mController.getActivity())
+                .setTitle(R.string.recover_title)
+                .setMessage(R.string.recover_prompt)
+                .setPositiveButton(R.string.recover_yes, new OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        mController.doStart(state, intent);
+                    }
+                })
+                .setNegativeButton(R.string.recover_no, new OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        clearState();
+                        mController.doStart(null, intent);
+                    }
+                })
+                .show();
+    }
+
+    public void startRecovery(Intent intent) {
+        Parcel parcel = Parcel.obtain();
+        try {
+            Context context = mController.getActivity();
+            FileInputStream fin = context.openFileInput(STATE_FILE);
+            ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
+            byte[] buffer = new byte[BUFFER_SIZE];
+            int read;
+            while ((read = fin.read(buffer)) > 0) {
+                dataStream.write(buffer, 0, read);
+            }
+            byte[] data = dataStream.toByteArray();
+            parcel.unmarshall(data, 0, data.length);
+            parcel.setDataPosition(0);
+            Bundle state = parcel.readBundle();
+            promptToRecover(state, intent);
+        } catch (FileNotFoundException e) {
+            // No state to recover
+            mController.doStart(null, intent);
+        } catch (Exception e) {
+            Log.w(LOGTAG, "Failed to recover state!", e);
+            mController.doStart(null, intent);
+        } finally {
+            parcel.recycle();
+        }
+    }
+}