More backup tests

1 files changed, 68 insertions, 0 deletions

diff --git a/core/java/android/backup/FileBackupHelper.java b/core/java/android/backup/FileBackupHelper.java
new file mode 100644
index 0000000..3b2122c
--- /dev/null
+++ b/core/java/android/backup/FileBackupHelper.java
@@ -0,0 +1,68 @@
+/*
+ * 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 android.backup;
+
+import android.content.Context;
+import android.os.ParcelFileDescriptor;
+
+import java.io.FileDescriptor;
+
+public class FileBackupHelper {
+    /**
+     * Based on oldSnapshot, determine which of the files from the application's data directory
+     * need to be backed up, write them to the data stream, and fill in newSnapshot with the
+     * state as it exists now.
+     */
+    public static void performBackup(Context context,
+            ParcelFileDescriptor oldSnapshot, ParcelFileDescriptor newSnapshot,
+            BackupDataOutput data, String[] files) {
+        String basePath = context.getFilesDir().getAbsolutePath();
+        performBackup_checked(basePath, oldSnapshot, newSnapshot, data, files);
+    }
+
+    /**
+     * Check the parameters so the native code doens't have to throw all the exceptions
+     * since it's easier to do that from java.
+     */
+    static void performBackup_checked(String basePath,
+            ParcelFileDescriptor oldSnapshot, ParcelFileDescriptor newSnapshot,
+            BackupDataOutput data, String[] files) {
+        if (newSnapshot == null) {
+            throw new NullPointerException("newSnapshot==null");
+        }
+        if (data == null) {
+            throw new NullPointerException("data==null");
+        }
+        if (data.fd == null) {
+            throw new NullPointerException("data.fd==null");
+        }
+        if (files == null) {
+            throw new NullPointerException("files==null");
+        }
+
+        int err = performBackup_native(basePath, oldSnapshot.getFileDescriptor(),
+                newSnapshot.getFileDescriptor(), data.fd, files);
+
+        if (err != 0) {
+            throw new RuntimeException("Backup failed"); // TODO: more here
+        }
+    }
+
+    native private static int performBackup_native(String basePath,
+            FileDescriptor oldSnapshot, FileDescriptor newSnapshot,
+            FileDescriptor data, String[] files);
+}