/
ValueReader.scala
71 lines (58 loc) · 2.65 KB
/
ValueReader.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
import geotrellis.raster._
import geotrellis.raster.resample._
import geotrellis.spark._
import geotrellis.spark.io.avro._
import geotrellis.spark.io.json._
import spray.json._
import scala.reflect._
import java.net.URI
import java.util.ServiceLoader
/** A key-value reader producer to read a layer one value at a time.
* This interface abstracts over various construction requirements for
* constructing a storage back-end specific reader. */
trait ValueReader[ID] {
val attributeStore: AttributeStore
/** Produce a key value reader for a specific layer, prefetching layer metadata once at construction time */
def reader[K: AvroRecordCodec: JsonFormat: ClassTag, V: AvroRecordCodec](layerId: ID): Reader[K, V]
def overzoomingReader[
K: AvroRecordCodec: JsonFormat: SpatialComponent: ClassTag,
V <: CellGrid: AvroRecordCodec: ? => TileResampleMethods[V]
](layerId: ID, resampleMethod: ResampleMethod = ResampleMethod.DEFAULT): Reader[K, V]
}
object ValueReader {
def apply(attributeStore: AttributeStore, valueReaderUri: URI): ValueReader[LayerId] = {
import scala.collection.JavaConversions._
ServiceLoader.load(classOf[ValueReaderProvider]).iterator()
.find(_.canProcess(valueReaderUri))
.getOrElse(throw new RuntimeException(s"Unable to find ValueReaderProvider for $valueReaderUri"))
.valueReader(valueReaderUri, attributeStore)
}
def apply(attributeStoreUri: URI, valueReaderUri: URI): ValueReader[LayerId] =
apply(AttributeStore(attributeStoreUri), valueReaderUri)
def apply(uri: URI): ValueReader[LayerId] =
apply(attributeStoreUri = uri, valueReaderUri = uri)
def apply(attributeStore: AttributeStore, valueReaderUri: String): ValueReader[LayerId] =
apply(attributeStore, new URI(valueReaderUri))
def apply(attributeStoreUri: String, valueReaderUri: String): ValueReader[LayerId] =
apply(AttributeStore(new URI(attributeStoreUri)), new URI(valueReaderUri))
def apply(uri: String): ValueReader[LayerId] = {
val _uri = new URI(uri)
apply(attributeStoreUri = _uri, valueReaderUri = _uri)
}
}