/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.timezone;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.util.Arrays;
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/**
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* A deserialized version of the byte[] sent to the time zone update application to identify a
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* triggered time zone update check. It encodes the optimistic lock ID used to detect
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* concurrent checks and the minimal package versions that will have been checked.
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*/
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final class CheckToken {
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final int mOptimisticLockId;
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final PackageVersions mPackageVersions;
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CheckToken(int optimisticLockId, PackageVersions packageVersions) {
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this.mOptimisticLockId = optimisticLockId;
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if (packageVersions == null) {
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throw new NullPointerException("packageVersions == null");
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}
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this.mPackageVersions = packageVersions;
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}
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byte[] toByteArray() {
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ByteArrayOutputStream baos = new ByteArrayOutputStream(12 /* (3 * sizeof(int)) */);
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try (DataOutputStream dos = new DataOutputStream(baos)) {
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dos.writeInt(mOptimisticLockId);
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dos.writeLong(mPackageVersions.mUpdateAppVersion);
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dos.writeLong(mPackageVersions.mDataAppVersion);
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} catch (IOException e) {
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throw new RuntimeException("Unable to write into a ByteArrayOutputStream", e);
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}
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return baos.toByteArray();
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}
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static CheckToken fromByteArray(byte[] tokenBytes) throws IOException {
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ByteArrayInputStream bais = new ByteArrayInputStream(tokenBytes);
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try (DataInputStream dis = new DataInputStream(bais)) {
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int versionId = dis.readInt();
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long updateAppVersion = dis.readLong();
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long dataAppVersion = dis.readLong();
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return new CheckToken(versionId, new PackageVersions(updateAppVersion, dataAppVersion));
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}
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (o == null || getClass() != o.getClass()) {
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return false;
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}
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CheckToken checkToken = (CheckToken) o;
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if (mOptimisticLockId != checkToken.mOptimisticLockId) {
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return false;
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}
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return mPackageVersions.equals(checkToken.mPackageVersions);
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}
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@Override
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public int hashCode() {
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int result = mOptimisticLockId;
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result = 31 * result + mPackageVersions.hashCode();
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return result;
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}
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@Override
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public String toString() {
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return "Token{" +
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"mOptimisticLockId=" + mOptimisticLockId +
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", mPackageVersions=" + mPackageVersions +
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'}';
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}
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}
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