| /* |
| * Copyright (C) 2017 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.car; |
| |
| import android.annotation.Nullable; |
| import android.util.ArrayMap; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| |
| public class VmsPublishersInfo { |
| private static final byte[] EMPTY_RESPONSE = new byte[0]; |
| |
| private final Object mLock = new Object(); |
| @GuardedBy("mLock") |
| private final ArrayMap<InfoWrapper, Integer> mPublishersIds = new ArrayMap<>(); |
| @GuardedBy("mLock") |
| private final ArrayList<InfoWrapper> mPublishersInfo = new ArrayList<>(); |
| |
| private static class InfoWrapper { |
| private final byte[] mInfo; |
| |
| InfoWrapper(byte[] info) { |
| mInfo = info; |
| } |
| |
| public byte[] getInfo() { |
| return mInfo.clone(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof InfoWrapper)) { |
| return false; |
| } |
| InfoWrapper p = (InfoWrapper) o; |
| return Arrays.equals(this.mInfo, p.mInfo); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Arrays.hashCode(mInfo); |
| } |
| } |
| |
| /** |
| * Retrieves the publisher ID for the given publisher information. If the publisher information |
| * has not previously been seen, it will be assigned a new publisher ID. |
| * |
| * @param publisherInfo Publisher information to query or register. |
| * @return Publisher ID for the given publisher information. |
| */ |
| public int getIdForInfo(byte[] publisherInfo) { |
| Integer publisherId; |
| InfoWrapper wrappedPublisherInfo = new InfoWrapper(publisherInfo); |
| synchronized (mLock) { |
| // Check if publisher is already registered |
| publisherId = mPublishersIds.get(wrappedPublisherInfo); |
| if (publisherId == null) { |
| // Add the new publisher and assign it the next ID |
| mPublishersInfo.add(wrappedPublisherInfo); |
| publisherId = mPublishersInfo.size(); |
| mPublishersIds.put(wrappedPublisherInfo, publisherId); |
| } |
| } |
| return publisherId; |
| } |
| |
| /** |
| * Returns the publisher info associated with the given publisher ID. |
| * @param publisherId Publisher ID to query. |
| * @return Publisher info associated with the ID, or an empty array if publisher ID is unknown. |
| */ |
| public byte[] getPublisherInfo(int publisherId) { |
| synchronized (mLock) { |
| byte[] result = getPublisherInfoOrNull(publisherId); |
| return result != null ? result : EMPTY_RESPONSE; |
| } |
| } |
| |
| /** |
| * Returns the publisher info associated with the given publisher ID. |
| * @param publisherId Publisher ID to query. |
| * @return Publisher info associated with the ID, or null if publisher ID is unknown. |
| */ |
| @Nullable |
| public byte[] getPublisherInfoOrNull(int publisherId) { |
| synchronized (mLock) { |
| return publisherId < 1 || publisherId > mPublishersInfo.size() |
| ? null |
| : mPublishersInfo.get(publisherId - 1).getInfo(); |
| } |
| } |
| } |
| |