org.datasyslab.geosparkviz.sql.utils.LineageDecoder.scala Maven / Gradle / Ivy

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Geospatial visualization extension of GeoSpark

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/*
 * FILE: LineageDecoder.scala
 * Copyright (c) 2015 - 2019 GeoSpark Development Team
 *
 * 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.datasyslab.geosparkviz.sql.utils

object LineageDecoder {

  def apply(lineage:String): String = {
    var lineageIterator = lineage
    var partitionX = 0
    var partitionY = 0
    for (i <- 1 to lineage.length){
      val offset = relativeOffset(lineageIterator.take(1).toInt)
      partitionX = partitionX*2 + offset._1
      partitionY = partitionY*2 + offset._2
      lineageIterator = lineageIterator.drop(1)
    }
    lineage.length+"-"+partitionX+"-"+partitionY
  }

  def relativeOffset(id:Int): (Int, Int) = {
    id match {
      case 0 => (0,0)
      case 1 => (1,0)
      case 2 => (0,1)
      case 3 => (1,1)
    }
  }

}