code: /**
   * Copyright 2021 Alibaba, Inc. and its affiliates. 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.
   
   * <p>
   * \author   Hongqing.hu
   * \date     Mar 2021
   * \brief    CollectionInfo contains information for collection
   */
  
  package com.alibaba.proxima.be.client;
  
  /**
   * Contains information for collection
   */
  public class CollectionInfo {
    private final CollectionConfig collectionConfig;
    private final CollectionStatus collectionStatus;
    private final String uuid;
    private final LsnContext latestLsnContext;
    private final long magicNumber;
  
    private CollectionInfo(Builder builder) {
      this.collectionConfig = builder.collectionConfig;
      this.collectionStatus = builder.collectionStatus;
      this.uuid = builder.uuid;
      this.latestLsnContext = builder.latestLsnContext;
      this.magicNumber = builder.magicNumber;
    }
  
    public CollectionConfig getCollectionConfig() {
      return collectionConfig;
    }
  
    public CollectionStatus getCollectionStatus() {
      return collectionStatus;
    }
  
    public String getUuid() {
      return uuid;
    }
  
    public LsnContext getLatestLsnContext() {
      return latestLsnContext;
    }
  
    public long getMagicNumber() {
      return magicNumber;
    }
  
    // New CollectionInfo builder
    public static Builder newBuilder() {
      return new Builder();
    }
  
    /**
     * Builder for CollectionInfo
     */
    public static class Builder {
      // required parameters
      private CollectionConfig collectionConfig;
      private CollectionStatus collectionStatus;
      private String uuid;
  
      // optional parameters
      private LsnContext latestLsnContext = null;
      private long magicNumber = 0;
  
      /**
       * Constructor without parameters
       */
      public Builder() {
      }
  
      /**
       * Set collection config
       * @param collectionConfig collection config
       * @return Builder
       */
      public Builder withCollectionConfig(CollectionConfig collectionConfig) {
        this.collectionConfig = collectionConfig;
        return this;
      }
  
      /**
       * Sset collection status
       * @param collectionStatus collection status
       * @return Builder
       */
      public Builder withCollectionStatus(CollectionStatus collectionStatus) {
        this.collectionStatus = collectionStatus;
        return this;
      }
  
      /**
       * Set uuid
       * @param uuid unique user id
       * @return Builder
       */
      public Builder withUuid(String uuid) {
        this.uuid = uuid;
        return this;
      }
  
      /**
       * Set latest lsn context
       * @param latestLsnContext latest lsn context, only use with mysql repository
       * @return Builder
       */
      public Builder withLatestLsnContext(LsnContext latestLsnContext) {
        this.latestLsnContext = latestLsnContext;
        return this;
      }
  
      /**
       * Set magic number
       * @param magicNumber magic number from server
       * @return Builder
       */
      public Builder withMagicNumber(long magicNumber) {
        this.magicNumber = magicNumber;
        return this;
      }
  
      /**
       * Build CollectionInfo object
       * @return CollectionInfo
       */
      public CollectionInfo build() {
        return new CollectionInfo(this);
      }
    }
  
    /**
     * Collection running status
     */
    public enum CollectionStatus {
      /**
       * Collection initialized
       */
      INITIALIZED(0),
      /**
       * Collection serving
       */
      SERVING(1),
      /**
       * Collection dropped
       */
      DROPPED(2),
      /**
       * Unknown status
       */
      UNKNOWN(-1);
  
      private int value;
  
      CollectionStatus(int value) {
        this.value = value;
      }
  
      public int getValue() {
        return this.value;
      }
  
      public static CollectionStatus valueOf(int value) {
        switch (value) {
          case 0:
            return INITIALIZED;
          case 1:
            return SERVING;
          case 2:
            return DROPPED;
          default:
            return UNKNOWN;
        }
      }
    }
  }
  