Merge topic/with-dataset

project.clj

@@ -1,4 +1,4 @@
-(defproject element84/clj-gdal "0.3.2"
+(defproject element84/clj-gdal "0.3.3"
   :description "Clojure-idiomatic GDAL wrapper"
   :url "http://github.com/Element84/clj-gdal"
   :license {:name "Eclipse Public License"

src/gdal/band.clj

@@ -280,6 +280,11 @@
   [band]
   (.GetYSize band))
 
+(defn get-size
+  "Fetch number of pixels along x and y axis"
+  [band]
+  [(get-x-size band) (get-y-size band)])
+
 (defn has-arbitrary-overviews
   "Check for arbitrary overviews"
   [band]

src/gdal/core.clj

@@ -6,11 +6,28 @@
   []
   (gdal/AllRegister))
 
-(defn open
-  "Open a raster file as a Dataset object"
-  [path]
+(defmulti open class)
+
+(defmethod open java.lang.String [path]
   (gdal/Open path))
 
+(defmethod open java.io.File [file]
+  (gdal/Open (.getAbsolutePath file)))
+
+(defn close
+  "Frees native resources associated to dataset, closes file."
+  [dataset]
+  (.delete dataset))
+
+(defmacro with-dataset
+  [[binding path] & body]
+  `(let [dataset# (open ~path)
+         ~binding dataset#]
+      (try
+        (do ~@body)
+        (finally
+          (close dataset#)))))
+
 (defn version-info
   "Get information about the current version of GDAL"
   [& request]