add storage java internal reader
Test: n/a
Bug: n/a
Change-Id: I852ab4080bee9240549dc4be0c09dbe1f72d06b0
diff --git a/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/StorageInternalReader.java b/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/StorageInternalReader.java
new file mode 100644
index 0000000..ddb86dc
--- /dev/null
+++ b/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/StorageInternalReader.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2024 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.aconfig.storage;
+
+public class StorageInternalReader {
+
+ private static final String MAP_PATH = "/metadata/aconfig/maps/";
+ private static final String BOOT_PATH = "/metadata/aconfig/boot/";
+
+ private PackageTable mPackageTable;
+ private FlagValueList mFlagValueList;
+
+ private int mPackageBooleanStartOffset;
+
+ public StorageInternalReader(String container, String packageName) {
+ this(container, packageName, MAP_PATH, BOOT_PATH);
+ }
+
+ public StorageInternalReader(
+ String container, String packageName, String mapPath, String bootPath) {
+
+ String packageMapFile = mapPath + container + ".package.map";
+ String flagValueFile = bootPath + container + ".val";
+
+ mPackageTable = PackageTable.fromBytes(mapStorageFile(packageMapFile));
+ mFlagValueList = FlagValueList.fromBytes(mapStorageFile(flagValueFile));
+ mPackageBooleanStartOffset = getPackageBooleanStartOffset(packageName);
+ }
+
+ public boolean getBooleanFlagValue(int index) {
+ index += mPackageBooleanStartOffset;
+ if (index >= mFlagValueList.size()) {
+ throw new AconfigStorageException("Fail to get boolean flag value");
+ }
+ return mFlagValueList.get(index);
+ }
+
+ private int getPackageBooleanStartOffset(String packageName) {
+ PackageTable.Node pNode = mPackageTable.get(packageName);
+ if (pNode == null) {
+ PackageTable.Header header = mPackageTable.getHeader();
+ throw new AconfigStorageException(
+ String.format(
+ "Fail to get package %s from container %s",
+ packageName, header.getContainer()));
+ }
+ return pNode.getBooleanStartIndex();
+ }
+
+ // Map a storage file given file path
+ private static MappedByteBuffer mapStorageFile(String file) {
+ try {
+ FileInputStream stream = new FileInputStream(file);
+ FileChannel channel = stream.getChannel();
+ return channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
+ } catch (IOException e) {
+ throw new AconfigStorageException(
+ String.format("Fail to mmap storage file %s", file), e);
+ }
+ }
+}