/
FileCollectionLayerReader.scala
80 lines (65 loc) · 2.93 KB
/
FileCollectionLayerReader.scala
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/*
* 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.file
import geotrellis.spark._
import geotrellis.spark.io._
import geotrellis.spark.io.avro._
import geotrellis.spark.io.index._
import geotrellis.util._
import com.typesafe.scalalogging.LazyLogging
import spray.json.JsonFormat
import scala.reflect.ClassTag
/**
* Handles reading raster RDDs and their metadata from a filesystem.
*
* @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 FileCollectionLayerReader(
val attributeStore: AttributeStore,
catalogPath: String
) extends CollectionLayerReader[LayerId] with LazyLogging {
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[FileLayerHeader, M, K](id)
} catch {
case e: AttributeNotFoundError => throw new LayerReadError(id).initCause(e)
}
val layerPath = header.path
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 = KeyPathGenerator(catalogPath, layerPath, maxWidth)
val decompose = (bounds: KeyBounds[K]) => keyIndex.indexRanges(bounds)
val seq = FileCollectionReader.read[K, V](keyPath, queryKeyBounds, decompose, filterIndexOnly, Some(writerSchema))
new ContextCollection(seq, layerMetadata)
}
}
object FileCollectionLayerReader {
def apply(attributeStore: AttributeStore, catalogPath: String): FileCollectionLayerReader =
new FileCollectionLayerReader(attributeStore, catalogPath)
def apply(catalogPath: String): FileCollectionLayerReader =
apply(new FileAttributeStore(catalogPath), catalogPath)
def apply(attributeStore: FileAttributeStore): FileCollectionLayerReader =
apply(attributeStore, attributeStore.catalogPath)
}