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/*
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *     https://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.google.apphosting.base;

import com.google.apphosting.base.protos.AppinfoPb.AppInfo;
import com.google.apphosting.base.protos.RuntimePb.UPRequest;
import com.google.auto.value.AutoValue;

/**
 * A simple immutable data container class that identifies a single
 * version of specific application.
 *
 * Static factory methods are provided to create AppVersionKey's from
 * AppInfo and UPRequests.
 *
 */
@AutoValue
public abstract class AppVersionKey {
  public static AppVersionKey fromAppInfo(AppInfo appInfo) {
    return of(appInfo.getAppId(), appInfo.getVersionId());
  }

  public static AppVersionKey fromUpRequest(UPRequest request) {
    return of(request.getAppId(), request.getVersionId());
  }

  public static AppVersionKey of(String appId, String versionId) {
    return new AutoValue_AppVersionKey(appId, versionId);
  }

  public abstract String getAppId();

  public abstract String getVersionId();

  @Override
  public final String toString() {
    return getAppId() + "/" + getVersionId();
  }
}