Merge pull request #83 from Olaren15/skip-caching-option

Added option to skip caching when enumerating rows

src/Lumina/Excel/ExcelSheet.cs

@@ -55,9 +55,12 @@ public ExcelSheet( ExcelHeaderFile headerFile, string name, Language requestedLa
             {
                 rowObj.PopulateData( parser, GameData, RequestedLanguage );
             }
-
-            _rowCache[ cacheKey ] = rowObj;
-
+
+            if( !NoCache.IsEnabled )
+            {
+                _rowCache[ cacheKey ] = rowObj;
+            }
+
             return rowObj;
         }
 
@@ -111,7 +114,11 @@ public IEnumerator< T > GetEnumerator()
                         }
 
                         var obj = ReadSubRowObj( parser, rowPtr.RowId, i );
-                        _rowCache.TryAdd( cacheKey, obj );
+                        if( !NoCache.IsEnabled )
+                        {
+                            _rowCache.TryAdd( cacheKey, obj );
+                        }
+
                         yield return obj;
                     }
                 }
@@ -125,12 +132,16 @@ public IEnumerator< T > GetEnumerator()
                     }
 
                     var obj = ReadRowObj( parser, rowPtr.RowId );
-                    _rowCache.TryAdd( cacheKey, obj );
+                    if( !NoCache.IsEnabled )
+                    {
+                        _rowCache.TryAdd( cacheKey, obj );
+                    }
+
                     yield return obj;
                 }
             }
         }
-
+        
         IEnumerator IEnumerable.GetEnumerator()
         {
             return GetEnumerator();

src/Lumina/Excel/NoCache.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Lumina.Excel
+{
+    /// <summary>
+    /// Class that allows to skip the caching of Excel rows when they are read.
+    /// </summary>
+    public sealed class NoCache : IDisposable
+    {
+        [field: ThreadStatic]
+        internal static bool IsEnabled { get; private set; }
+
+        /// <summary>
+        /// Disables the caching of Excel rows when they are read.
+        /// </summary>
+        public NoCache()
+        {
+            IsEnabled = true;
+        }
+
+        /// <summary>
+        /// Re-enables the caching of Excel rows when they are read.
+        /// </summary>
+        public void Dispose()
+        {
+            IsEnabled = false;
+        }
+    }
+}