/*
    * Copyright 2021 TiKV Project Authors.
    *
    * 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 org.tikv.common.meta;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  /** TiTimestamp is the timestamp returned by timestamp oracle inside placement driver */
  public class TiTimestamp implements Serializable {
    private static final int PHYSICAL_SHIFT_BITS = 18;
  
    private final long physical;
    private final long logical;
  
    public TiTimestamp(long p, long l) {
      this.physical = p;
      this.logical = l;
    }
  
    public static long extractPhysical(long ts) {
      return ts >> PHYSICAL_SHIFT_BITS;
    }
  
    public long getVersion() {
      return (physical << PHYSICAL_SHIFT_BITS) + logical;
    }
  
    public long getPhysical() {
      return this.physical;
    }
  
    public long getLogical() {
      return this.logical;
    }
  
    public TiTimestamp getPrevious() {
      return new TiTimestamp(physical, logical - 1);
    }
  
    @Override
    public boolean equals(Object other) {
      if (other == this) {
        return true;
      }
      if (!(other instanceof TiTimestamp)) {
        return false;
      }
      return this.getVersion() == ((TiTimestamp) other).getVersion();
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(getVersion());
    }
  
    @Override
    public String toString() {
      return "TiTimestamp(" + getVersion() + ")";
    }
  }