Refactor and harden ZaaImporter.

Tests/Importer/ZaaImporter/ZaaImporterTest.cs

@@ -41,5 +41,15 @@ namespace Tests.Importer.ZaaImporter
             // Only 6 distinct time points (see method documentation above).
             Assert.AreEqual(6, importer.Laboratory.TimePoints.Count);
         }
+
+        [Test]
+        public void ParseInvalidInput()
+        {
+            zaa.ZaaImporter importer = new zaa.ZaaImporter();
+            importer.Import("some arbitrary text\r\nthat does not represent\r\na valid lab");
+            Assert.IsFalse(importer.Success);
+            importer.Import("(03.03.1930 13:30:00)\r\nKlinische Chemie: Natrium 135 [135 - 145] mmol/l;");
+            Assert.IsTrue(importer.Success);
+        }
     }
 }

zaaReloaded2/Importer/IImporter.cs

@@ -30,6 +30,11 @@ namespace zaaReloaded2.Importer
         /// </summary>
         Laboratory Laboratory { get; set; }
 
+        /// <summary>
+        /// Indicates whether the import was successful.
+        /// </summary>
+        bool Success { get; }
+
         /// <summary>
         /// Imports laboratory data contained in a string.
         /// </summary>

zaaReloaded2/Importer/ZaaImporter/LaurisParagraph.cs

@@ -32,6 +32,19 @@ namespace zaaReloaded2.Importer.ZaaImporter
     /// </summary>
     public class LaurisParagraph
     {
+        #region Static methods
+
+        /// <summary>
+        /// Investigates a paragraph and determines whether it looks
+        /// like a Lauris laboratory items paragraph.
+        /// </summary>
+        public static bool ResemblesLaurisParagraph(string paragraph)
+        {
+            return _expectedFormat.IsMatch(paragraph);
+        }
+
+        #endregion
+
         #region Public properties
 
         /// <summary>
@@ -122,7 +135,7 @@ namespace zaaReloaded2.Importer.ZaaImporter
 
         #region Fields
 
-        static readonly Regex _expectedFormat = new Regex(@"(?<caption>[^:]+:\s*)?(?<items>[^:]+:\s*[^;]+;)*");
+        static readonly Regex _expectedFormat = new Regex(@"(?<caption>[^:]+:\s*)?(?<items>[^:]+:\s*[^;]+;)+");
         Thesaurus.Parameters _parameterDictionary;
         Thesaurus.Units _unitDictionary;
 

zaaReloaded2/Importer/ZaaImporter/LaurisTimePoint.cs

@@ -65,11 +65,15 @@ namespace zaaReloaded2.Importer.ZaaImporter
         /// <summary>
         /// Gets an array of paragraphs in this LaurisText.
         /// </summary>
-        public string[] Paragraphs
+        public IList<String> Paragraphs
         {
             [DebuggerStepThrough]
             get
             {
+                if (_paragraphs == null)
+                {
+                    _paragraphs = new List<String>();
+                }
                 return _paragraphs;
             }
             set
@@ -101,7 +105,7 @@ namespace zaaReloaded2.Importer.ZaaImporter
                 {
                     Paragraphs = value.Split(
                         new string[] { Environment.NewLine },
-                        StringSplitOptions.None);
+                        StringSplitOptions.None).ToList();
                 }
             }
         }
@@ -128,7 +132,7 @@ namespace zaaReloaded2.Importer.ZaaImporter
         { }
 
         public LaurisTimePoint(
-            string[] paragraphs,
+            IList<String> paragraphs,
             Parameters parameterDictionary,
             Units unitDictionary)
             : this()
@@ -138,33 +142,64 @@ namespace zaaReloaded2.Importer.ZaaImporter
             Paragraphs = paragraphs;
         }
 
-        public LaurisTimePoint(string[] paragraphs)
+        public LaurisTimePoint(IList<String> paragraphs)
             : this(paragraphs, null, null)
         {
         }
 
         #endregion
 
+        #region Public methods
+
+        /// <summary>
+        /// Adds a new paragraph to this time point by parsing
+        /// the paragraph for laboratory items.
+        /// </summary>
+        /// <param name="paragraph">Paragraph to add.</param>
+        public void AddParagraph(string paragraph)
+        {
+            Paragraphs.Add(paragraph);
+            ParseParagraph(paragraph);
+        }
+
+        #endregion
+
         #region Private methods
 
         /// <summary>
         /// Analyzes each Lauris paragraph in this time point, sets the date
         /// and time, and collects LabItem data.
         /// </summary>
-        /// <returns>True if the LaurisText has time stamp in the first paragraphs
+        void ParseParagraphs()
-        /// and contains <see cref="LabItem"/>s in the others.</returns>
-        bool ParseParagraphs()
         {
-            if (Paragraphs.Length > 0)
+            if (Paragraphs != null)
             {
-                if (!ParseTimeStamp()) return false;
+                foreach (string paragraph in Paragraphs)
-                LaurisParagraph lp;
-                if (IsValidTimePoint)
                 {
-                    for (int i = 1; i < Paragraphs.Length; i++)
+                    ParseParagraph(paragraph);
+                }
+            }
+        }
+
+        void ParseParagraph(string paragraph)
         {
-                        lp = new LaurisParagraph(
+            if (_timeStampRegex.IsMatch(paragraph))
-                                Paragraphs[i],
+            {
+                DateTime dt;
+                if (DateTime.TryParseExact(
+                    _timeStampRegex.Match(paragraph).Groups["datetime"].Value,
+                    "dd.MM.yyyy HH:mm",
+                    CultureInfo.InvariantCulture,
+                    DateTimeStyles.AllowWhiteSpaces,
+                    out dt))
+                {
+                    TimeStamp = dt;
+                }
+            }
+            else
+            {
+                LaurisParagraph lp = new LaurisParagraph(
+                        paragraph,
                         _parameterDictionary,
                         _unitDictionary);
                 if (lp.IsLaurisParagraph)
@@ -173,38 +208,6 @@ namespace zaaReloaded2.Importer.ZaaImporter
                 }
             }
         }
-                IsValidTimePoint = Items.Count > 0;
-            }
-            return true;
-        }
-
-        /// <summary>
-        /// Analyzes the date and time information that is expected to be
-        /// in the first paragraph.
-        /// </summary>
-        /// <returns>True if the LaurisText contains a time stamp in the
-        /// first paragraph.</returns>
-        bool ParseTimeStamp()
-        {
-            if (Paragraphs.Length == 0)
-                throw new InvalidOperationException("The time point has no paragraphs.");
-
-            Match m = _timeStampRegex.Match(Paragraphs[0]);
-            bool success = false;
-            if (m.Success)
-            {
-                DateTime dt;
-                success = DateTime.TryParseExact(
-                    m.Groups["datetime"].Value,
-                    "dd.MM.yyyy HH:mm",
-                    CultureInfo.InvariantCulture,
-                    DateTimeStyles.AllowWhiteSpaces,
-                    out dt);
-                TimeStamp = dt;
-            }
-            IsValidTimePoint = success;
-            return success;
-        }
 
         void AddItems(IItemDictionary items)
         {
@@ -221,7 +224,7 @@ namespace zaaReloaded2.Importer.ZaaImporter
         /// </summary>
         static readonly Regex _timeStampRegex = new Regex(
             @"^\s*\(?\s*(?<datetime>\d\d\.\d\d\.\d\d\d\d\s+\d\d:\d\d)");
-        string[] _paragraphs;
+        IList<String> _paragraphs;
         Parameters _parameterDictionary;
         Units _unitDictionary;
 

zaaReloaded2/Importer/ZaaImporter/ZaaImporter.cs

@@ -52,6 +52,14 @@ namespace zaaReloaded2.Importer.ZaaImporter
             }
         }
 
+        public bool Success
+        {
+            get
+            {
+                return Laboratory.TimePoints.Count > 0;
+            }
+        }
+
         /// <summary>
         /// Splits the <paramref name="text"/> into individual time points
         /// and creates <see cref="LaurisTimePoint"/> objects from them.
@@ -62,42 +70,29 @@ namespace zaaReloaded2.Importer.ZaaImporter
             string[] paragraphs = text.Split(
                 new string[] { Environment.NewLine },
                 StringSplitOptions.RemoveEmptyEntries);
-            int i = 0;
+            LaurisTimePoint timePoint = null;
-            int start = 0;
-            int numParagraphs = paragraphs.Length;
 
-            while (i < numParagraphs)
+            foreach (string paragraph in paragraphs)
             {
-                // Search for the next occurrence of a time stamp line
+                // If the current paragraph looks like a Lauris time stamp,
-                while (i < numParagraphs
+                // create a new time point.
-                    && !LaurisTimePoint.IsTimeStampLine(paragraphs[i]))
+                if (LaurisTimePoint.IsTimeStampLine(paragraph))
                 {
-                    i++;
+                    timePoint = new LaurisTimePoint(paragraph);
+                    Laboratory.AddTimePoint(timePoint);
                 }
-
+                // If the current paragraph looks like a paragraph with
-                // TODO: Find an alternative to returning in the middle of the method.
+                // laboratory items, add it to the current time point;
-                if (i >= numParagraphs) return;
+                // if no time point exists yet, create one.
-
+                else if (LaurisParagraph.ResemblesLaurisParagraph(paragraph))
-                if (LaurisTimePoint.IsTimeStampLine(paragraphs[i]))
                 {
-                    // Remember the time stamp line's index
+                    if (timePoint == null)
-                    start = i;
-
-                    // Seek the next time stamp line
-                    while (i + 1 < numParagraphs
-                        && !LaurisTimePoint.IsTimeStampLine(paragraphs[i + 1]))
                     {
-                        i++;
+                        timePoint = new LaurisTimePoint();
+                        Laboratory.AddTimePoint(timePoint);
                     }
+                    timePoint.AddParagraph(paragraph);
                 }
-
-                Laboratory.AddTimePoint(
-                    new LaurisTimePoint(
-                        paragraphs.Slice(start, i - start + 1),
-                        _parameters,
-                        _units
-                        )
-                    );
             }
         }