astraea.spark.rasterframes.encoders.CRSEncoder.scala Maven / Gradle / Ivy

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RasterFrames brings the power of Spark DataFrames to geospatial raster data, empowered by the map algebra and tile layer operations of GeoTrellis

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/*
 * This software is licensed under the Apache 2 license, quoted below.
 *
 * Copyright 2017 Astraea, Inc.
 *
 * 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 astraea.spark.rasterframes.encoders

import geotrellis.proj4.CRS
import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder

/**
 * Custom encoder for GT `CRS`.
 *
 * @since 7/21/17
 */
object CRSEncoder {
  def apply(): ExpressionEncoder[CRS] = StringBackedEncoder[CRS](
    "crsProj4", "toProj4String", (CRSEncoder.getClass, "fromString")
  )
  // Not sure why this delegate is necessary, but doGenCode fails without it.
  def fromString(str: String): CRS = CRS.fromString(str)
}