edu.ucr.cs.bdlab.beast.io.gpxv2.GPXPartitionReaderFactory.scala Maven / Gradle / Ivy

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/*
 * Copyright 2022 University of California, Riverside
 *
 * 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 edu.ucr.cs.bdlab.beast.io.gpxv2

import edu.ucr.cs.bdlab.beast.io.SpatialFilePartition2
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FSDataInputStream, Path}
import org.apache.spark.SparkConf
import org.apache.spark.broadcast.Broadcast
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.connector.read.{InputPartition, PartitionReader, PartitionReaderFactory}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.StructType
import org.apache.spark.util.SerializableConfiguration

case class GPXPartitionReaderFactory(sqlConf: SQLConf,
                                     sparkConf: SparkConf,
                                     broadcastedConf: Broadcast[SerializableConfiguration],
                                     dataSchema: StructType,
                                     parsedOptions: Map[String, String])
  extends PartitionReaderFactory with Logging {

  override def createReader(partition: InputPartition): PartitionReader[InternalRow] = {
    val spartition = partition.asInstanceOf[SpatialFilePartition2]
    val conf: Configuration = broadcastedConf.value.value
    val path = new Path(spartition.filePath)
    val fileSystem = path.getFileSystem(conf)
    val fileIn: FSDataInputStream = fileSystem.open(path)
    val gpxReader = new GPXReader2(fileIn, path.getName)
    new PartitionReader[InternalRow] {
      var currentValue: InternalRow = _
      override def next(): Boolean = {
        if (!gpxReader.hasNext) {
          currentValue = null
          false
        } else {
          currentValue = gpxReader.next()
          true
        }
      }

      override def get(): InternalRow = currentValue

      override def close(): Unit = gpxReader.close
    }
  }
}