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/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * 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.google.cloud.logging;

import com.google.logging.type.LogSeverity;

/**
 * The severity of the event described in a log entry. These guideline severity levels are ordered,
 * with numerically smaller levels treated as less severe than numerically larger levels. If the
 * source of the log entries uses a different set of severity levels, the client should select the
 * closest corresponding {@code Severity} value.
 */
public enum Severity {

  /**
   * The log entry has no assigned severity level.
   */
  DEFAULT(LogSeverity.DEFAULT),

  /**
   * Debug or trace information.
   */
  DEBUG(LogSeverity.DEBUG),

  /**
   * Routine information, such as ongoing status or performance.
   */
  INFO(LogSeverity.INFO),

  /**
   * Normal but significant events, such as start up, shut down, or configuration.
   */
  NOTICE(LogSeverity.NOTICE),

  /**
   * Warning events might cause problems.
   */
  WARNING(LogSeverity.WARNING),

  /**
   * Error events are likely to cause problems.
   */
  ERROR(LogSeverity.ERROR),

  /**
   * Critical events cause more severe problems or brief outages.
   */
  CRITICAL(LogSeverity.CRITICAL),

  /**
   * A person must take an action immediately.
   */
  ALERT(LogSeverity.ALERT),

  /**
   * One or more systems are unusable.
   */
  EMERGENCY(LogSeverity.EMERGENCY);

  private final LogSeverity versionPb;

  Severity(LogSeverity versionPb) {
    this.versionPb = versionPb;
  }

  LogSeverity toPb() {
    return versionPb;
  }

  static Severity fromPb(LogSeverity severityPb) {
    switch (severityPb) {
      case DEFAULT:
        return DEFAULT;
      case DEBUG:
        return DEBUG;
      case INFO:
        return INFO;
      case NOTICE:
        return NOTICE;
      case WARNING:
        return WARNING;
      case ERROR:
        return ERROR;
      case CRITICAL:
        return CRITICAL;
      case ALERT:
        return ALERT;
      case EMERGENCY:
        return EMERGENCY;
      default:
        throw new IllegalArgumentException(severityPb + " is not a valid severity");
    }
  }
}