Implement DurationAdapter

MatFileHandler.Tests/MatFileReaderTests.cs

@@ -434,6 +434,21 @@ namespace MatFileHandler.Tests
             Assert.That(str[3], Is.EqualTo("æøå"));
         }
 
+        /// <summary>
+        /// Test duration objects.
+        /// </summary>
+        [Test]
+        public void TestDuration()
+        {
+            var matFile = GetTests("good")["duration"];
+            var d = matFile["d"].Value as IMatObject;
+            var duration = new DurationAdapter(d);
+            Assert.That(duration.Dimensions, Is.EquivalentTo(new[] { 1, 3 }));
+            Assert.That(duration[0], Is.EqualTo(TimeSpan.FromTicks(12345678L)));
+            Assert.That(duration[1], Is.EqualTo(new TimeSpan(0, 2, 4)));
+            Assert.That(duration[2], Is.EqualTo(new TimeSpan(1, 3, 5)));
+        }
+
         private static AbstractTestDataFactory<IMatFile> GetTests(string factoryName) =>
             new MatTestDataFactory(Path.Combine(TestDirectory, factoryName));
 

MatFileHandler/DurationAdapter.cs

@@ -0,0 +1,44 @@
+// Copyright 2017-2018 Alexander Luzgarev
+
+using System;
+
+namespace MatFileHandler
+{
+    /// <summary>
+    /// A better interface for using duration objects.
+    /// </summary>
+    public class DurationAdapter
+    {
+        private readonly int[] dimensions;
+        private readonly double[] data;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DurationAdapter"/> class.
+        /// </summary>
+        /// <param name="array">Source duration object.</param>
+        public DurationAdapter(IArray array)
+        {
+            var matObject = array as IMatObject;
+            if (matObject?.ClassName != "duration")
+            {
+                throw new ArgumentException("The object provided is not a duration.");
+            }
+
+            var dataObject = matObject["millis", 0];
+            data = dataObject.ConvertToDoubleArray();
+            dimensions = dataObject.Dimensions;
+        }
+
+        /// <summary>
+        /// Gets duration array dimensions.
+        /// </summary>
+        public int[] Dimensions => dimensions;
+
+        /// <summary>
+        /// Gets duration object at given position.
+        /// </summary>
+        /// <param name="list">Indices.</param>
+        /// <returns>Value.</returns>
+        public TimeSpan this[params int[] list] => TimeSpan.FromTicks((long)(10000.0 * data[Dimensions.DimFlatten(list)]));
+    }
+}