| /* |
| * Copyright (C) 2019 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.server.backup.encryption.kv; |
| |
| import static com.android.internal.util.Preconditions.checkArgument; |
| import static com.android.internal.util.Preconditions.checkNotNull; |
| |
| import com.android.server.backup.encryption.chunk.ChunkHash; |
| import com.android.server.backup.encryption.protos.nano.KeyValueListingProto; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| /** |
| * Builds a {@link KeyValueListingProto.KeyValueListing}, which is a nano proto and so has no |
| * builder. |
| */ |
| public class KeyValueListingBuilder { |
| private final List<KeyValueListingProto.KeyValueEntry> mEntries = new ArrayList<>(); |
| |
| /** Adds a new pair entry to the listing. */ |
| public KeyValueListingBuilder addPair(String key, ChunkHash hash) { |
| checkArgument(key.length() != 0, "Key must have non-zero length"); |
| checkNotNull(hash, "Hash must not be null"); |
| |
| KeyValueListingProto.KeyValueEntry entry = new KeyValueListingProto.KeyValueEntry(); |
| entry.key = key; |
| entry.hash = hash.getHash(); |
| mEntries.add(entry); |
| |
| return this; |
| } |
| |
| /** Adds all pairs contained in a map, where the map is from key to hash. */ |
| public KeyValueListingBuilder addAll(Map<String, ChunkHash> map) { |
| for (Entry<String, ChunkHash> entry : map.entrySet()) { |
| addPair(entry.getKey(), entry.getValue()); |
| } |
| |
| return this; |
| } |
| |
| /** Returns a new listing containing all the pairs added so far. */ |
| public KeyValueListingProto.KeyValueListing build() { |
| if (mEntries.size() == 0) { |
| return emptyListing(); |
| } |
| |
| KeyValueListingProto.KeyValueListing listing = new KeyValueListingProto.KeyValueListing(); |
| listing.entries = new KeyValueListingProto.KeyValueEntry[mEntries.size()]; |
| mEntries.toArray(listing.entries); |
| return listing; |
| } |
| |
| /** Returns a new listing which does not contain any pairs. */ |
| public static KeyValueListingProto.KeyValueListing emptyListing() { |
| KeyValueListingProto.KeyValueListing listing = new KeyValueListingProto.KeyValueListing(); |
| listing.entries = KeyValueListingProto.KeyValueEntry.emptyArray(); |
| return listing; |
| } |
| } |