Fix codestyle, make TypeClass more generic, cover with tests

raster/src/main/scala/geotrellis/raster/FeatureExtraction.scala

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2019 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.raster
 
 import geotrellis.raster.rasterize.Rasterizer
@@ -6,14 +22,14 @@ import spire.syntax.cfor._
 
 import scala.collection.mutable.ListBuffer
 
-trait FeatureExtraction[G <: Geometry, T <: CellGrid[Int], D] {
-  def features(geom: G, raster: Raster[T]): Array[Array[PointFeature[D]]]
+trait FeatureExtraction[G <: Geometry, T <: CellGrid[Int], F <: Geometry, D] {
+  def features(geom: G, raster: Raster[T]): Array[Array[Feature[F, D]]]
 }
 
 object FeatureExtraction {
-  def apply[G <: Geometry: FeatureExtraction[*, T, D], T <: CellGrid[Int], D] = implicitly[FeatureExtraction[G, T, D]]
+  def apply[G <: Geometry: FeatureExtraction[*, T, F, D], T <: CellGrid[Int], F <: Geometry, D] = implicitly[FeatureExtraction[G, T, F, D]]
 
-  implicit def multibandTile[G <: Geometry] = new FeatureExtraction[G, MultibandTile, Int] {
+  implicit def multibandTile[G <: Geometry] = new PointFeatureExtraction[G, MultibandTile, Int] {
     def features(geom: G, raster: Raster[MultibandTile]): Array[Array[PointFeature[Int]]] = {
       val arr = Array.ofDim[Array[PointFeature[Int]]](raster.tile.bandCount)
 
@@ -29,7 +45,7 @@ object FeatureExtraction {
     }
   }
 
-  implicit def multibandTileDouble[G <: Geometry] = new FeatureExtraction[G, MultibandTile, Double] {
+  implicit def multibandTileDouble[G <: Geometry] = new PointFeatureExtraction[G, MultibandTile, Double] {
     def features(geom: G, raster: Raster[MultibandTile]): Array[Array[PointFeature[Double]]] = {
       val arr = Array.ofDim[Array[PointFeature[Double]]](raster.tile.bandCount)
 
@@ -45,12 +61,12 @@ object FeatureExtraction {
     }
   }
 
-  implicit def tile[G <: Geometry] = new FeatureExtraction[G, Tile, Int] {
+  implicit def tile[G <: Geometry] = new PointFeatureExtraction[G, Tile, Int] {
     def features(geom: G, raster: Raster[Tile]): Array[Array[PointFeature[Int]]] =
       multibandTile[G].features(geom, raster.mapTile(MultibandTile(_)))
   }
 
-  implicit def tileDouble[G <: Geometry] = new FeatureExtraction[G, Tile, Double] {
+  implicit def tileDouble[G <: Geometry] = new PointFeatureExtraction[G, Tile, Double] {
     def features(geom: G, raster: Raster[Tile]): Array[Array[PointFeature[Double]]] = {
       multibandTileDouble[G].features(geom, raster.mapTile(MultibandTile(_)))
     }

raster/src/main/scala/geotrellis/raster/Implicits.scala

@@ -17,11 +17,9 @@
 package geotrellis.raster
 
 import geotrellis.vector.Point
-import geotrellis.macros.{NoDataMacros, TypeConversionMacros}
 import geotrellis.vector._
 import geotrellis.util.{MethodExtensions, np}
 
-
 object Implicits extends Implicits
 
 trait Implicits
@@ -127,25 +125,17 @@ trait Implicits
     }
   }
 
-  implicit class MultibandRasterFeatureExtractionMethods(val self: Raster[MultibandTile]) extends MethodExtensions[Raster[MultibandTile]] {
-    def features[G <: Geometry: FeatureExtraction[*, MultibandTile, D], D](geom: G, raster: Raster[MultibandTile]): Array[Array[PointFeature[D]]] =
-      FeatureExtraction[G, MultibandTile, D].features(geom, raster)
-
-    def featuresInt[G <: Geometry: FeatureExtraction[*, MultibandTile, Int]](geom: G, raster: Raster[MultibandTile]): Array[Array[PointFeature[Int]]] =
-      features[G, Int](geom, raster)
-
-    def featuresDouble[G <: Geometry: FeatureExtraction[*, MultibandTile, Double]](geom: G, raster: Raster[MultibandTile]): Array[Array[PointFeature[Double]]] =
-      features[G, Double](geom, raster)
+  implicit class MultibandRasterPointFeatureExtractionMethods(val self: Raster[MultibandTile]) extends MethodExtensions[Raster[MultibandTile]] {
+    def pointFeatures[D] = new {
+      def apply[G <: Geometry: PointFeatureExtraction[*, MultibandTile, D]](geom: G): Array[Array[PointFeature[D]]] =
+        FeatureExtraction[G, MultibandTile, Point, D].features(geom, self)
+    }
   }
 
-  implicit class rasterFeatureExtractionMethods(val self: Raster[Tile]) extends MethodExtensions[Raster[Tile]] {
-    def features[G <: Geometry: FeatureExtraction[*, Tile, D], D](geom: G, raster: Raster[Tile]): Array[PointFeature[D]] =
-      FeatureExtraction[G, Tile, D].features(geom, raster).head
-
-    def featuresInt[G <: Geometry: FeatureExtraction[*, Tile, Int]](geom: G, raster: Raster[Tile]): Array[PointFeature[Int]] =
-      features[G, Int](geom, raster)
-
-    def featuresDouble[G <: Geometry: FeatureExtraction[*, Tile, Double]](geom: G, raster: Raster[Tile]): Array[PointFeature[Double]] =
-      features[G, Double](geom, raster)
+  implicit class rasterPointFeatureExtractionMethods(val self: Raster[Tile]) extends MethodExtensions[Raster[Tile]] {
+    def pointFeatures[D] = new {
+      def apply[G <: Geometry: PointFeatureExtraction[*, Tile, D]](geom: G): Array[PointFeature[D]] =
+        FeatureExtraction[G, Tile, Point, D].features(geom, self).head
+    }
   }
 }

raster/src/main/scala/geotrellis/raster/package.scala

@@ -17,6 +17,7 @@
 package geotrellis
 
 import geotrellis.macros.{NoDataMacros, TypeConversionMacros}
+import geotrellis.vector.{Geometry, Point}
 import spire.math.Integral
 
 
@@ -184,6 +185,8 @@ package object raster extends Implicits {
     def fill(v: Double) = { java.util.Arrays.fill(arr, v) ; arr }
   }
 
+  type PointFeatureExtraction[G <: Geometry, T <: CellGrid[Int], D] = FeatureExtraction[G, T, Point, D]
+
   /* http://stackoverflow.com/questions/3508077/how-to-define-type-disjunction-union-types */
   sealed class TileOrMultibandTile[T]
   object TileOrMultibandTile {

raster/src/test/scala/geotrellis/raster/FeatureExtractionSpec.scala

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2019 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.raster
+
+import geotrellis.vector._
+import geotrellis.raster.testkit._
+
+import org.scalatest._
+
+class FeatureExtractionSpec extends FunSpec
+                  with Matchers
+                  with RasterMatchers
+                  with TileBuilders {
+  describe("Tile") {
+    it("should extract all int point features") {
+      val ext = Extent(0.0, 0.0, 3.0, 3.0)
+      val data = Array(
+        1, 2, 3,
+        4, 5, 6,
+        7, 8, 9
+      )
+      val raster = Raster(ArrayTile(data, 3, 3), ext)
+
+      val features = raster.pointFeatures[Int](ext.toPolygon)
+
+      features.map(_.data) shouldBe data
+      features.foreach { case feature @ Feature(point, _) => raster.pointFeatures[Int](point).head shouldBe feature }
+    }
+
+    it("should extract all double point features") {
+      val ext = Extent(0.0, 0.0, 3.0, 3.0)
+      val data = Array(
+        1.1, 2.2, 3.3,
+        4.4, 5.5, 6.6,
+        7.7, 8.8, 9.8
+      )
+      val raster = Raster(ArrayTile(data, 3, 3), ext)
+
+      val features = raster.pointFeatures[Double](ext.toPolygon)
+
+      features.map(_.data) shouldBe data
+      features.foreach { case feature @ Feature(point, _) => raster.pointFeatures[Double](point).head shouldBe feature }
+    }
+  }
+
+  describe("MultibandTile") {
+    it("should extract all int point features") {
+      val ext = Extent(0.0, 0.0, 3.0, 3.0)
+      val b1 = Array(
+        1, 2, 3,
+        4, 5, 6,
+        7, 8, 9
+      )
+      val b2 = b1.map(_ + 1)
+      val b3 = b2.map(_ + 1)
+      val data = Array(b1, b2, b3)
+      val raster = Raster(MultibandTile(data.map(ArrayTile(_, 3, 3))), ext)
+
+      val features = raster.pointFeatures[Int](ext.toPolygon)
+
+      features.map(_.map(_.data)) shouldBe data
+      features.zipWithIndex.foreach { case (features, i) =>
+        features.foreach { case feature @ Feature(point, _) =>
+          raster.pointFeatures[Int](point).apply(i).head shouldBe feature }
+      }
+    }
+
+    it("should extract all double point features") {
+      val ext = Extent(0.0, 0.0, 3.0, 3.0)
+      val b1 = Array(
+        1.1, 2.2, 3.3,
+        4.4, 5.5, 6.6,
+        7.7, 8.8, 9.8
+      )
+      val b2 = b1.map(_ + 1)
+      val b3 = b2.map(_ + 1)
+      val data = Array(b1, b2, b3)
+      val raster = Raster(MultibandTile(data.map(ArrayTile(_, 3, 3))), ext)
+
+      val features = raster.pointFeatures[Double](ext.toPolygon)
+
+      features.map(_.map(_.data)) shouldBe data
+      features.zipWithIndex.foreach { case (features, i) =>
+        features.foreach { case feature @ Feature(point, _) =>
+          raster.pointFeatures[Double](point).apply(i).head shouldBe feature }
+      }
+    }
+  }
+}