/
S3CollectionLayerReader.scala
75 lines (62 loc) · 2.79 KB
/
S3CollectionLayerReader.scala
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/*
* Copyright 2016 Azavea
*
* 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 geotrellis.spark.io.s3
import geotrellis.tiling._
import geotrellis.spark._
import geotrellis.spark.io._
import geotrellis.spark.io.avro._
import geotrellis.spark.io.index._
import geotrellis.util._
import spray.json.JsonFormat
import scala.reflect.ClassTag
/**
* Handles reading raster RDDs and their metadata from S3.
*
* @param attributeStore AttributeStore that contains metadata for corresponding LayerId
* @tparam K Type of RDD Key (ex: SpatialKey)
* @tparam V Type of RDD Value (ex: Tile or MultibandTile )
* @tparam M Type of Metadata associated with the RDD[(K,V)]
*/
class S3CollectionLayerReader(val attributeStore: AttributeStore) extends CollectionLayerReader[LayerId] {
def collectionReader: S3CollectionReader = S3CollectionReader
def read[
K: AvroRecordCodec: Boundable: JsonFormat: ClassTag,
V: AvroRecordCodec: ClassTag,
M: JsonFormat: Component[?, Bounds[K]]
](id: LayerId, rasterQuery: LayerQuery[K, M], filterIndexOnly: Boolean) = {
if(!attributeStore.layerExists(id)) throw new LayerNotFoundError(id)
val LayerAttributes(header, metadata, keyIndex, writerSchema) = try {
attributeStore.readLayerAttributes[S3LayerHeader, M, K](id)
} catch {
case e: AttributeNotFoundError => throw new LayerReadError(id).initCause(e)
}
val bucket = header.bucket
val prefix = header.key
val queryKeyBounds = rasterQuery(metadata)
val layerMetadata = metadata.setComponent[Bounds[K]](queryKeyBounds.foldLeft(EmptyBounds: Bounds[K])(_ combine _))
val maxWidth = Index.digits(keyIndex.toIndex(keyIndex.keyBounds.maxKey))
val keyPath = (index: BigInt) => makePath(prefix, Index.encode(index, maxWidth))
val decompose = (bounds: KeyBounds[K]) => keyIndex.indexRanges(bounds)
val seq = collectionReader.read[K, V](bucket, keyPath, queryKeyBounds, decompose, filterIndexOnly, Some(writerSchema))
new ContextCollection(seq, layerMetadata)
}
}
object S3CollectionLayerReader {
def apply(attributeStore: AttributeStore): S3CollectionLayerReader =
new S3CollectionLayerReader(attributeStore)
def apply(bucket: String, prefix: String): S3CollectionLayerReader =
apply(new S3AttributeStore(bucket, prefix))
}