Poi bug 60605: convert Workbook.SHEET_STATE_* to SheetVisibility enum

main/HSSF/Model/InternalWorkbook.cs

@@ -775,6 +775,31 @@ public bool IsSheetVeryHidden(int sheetnum)
         {
             return GetBoundSheetRec(sheetnum).IsVeryHidden;
         }
+
+        /**
+         * Gets the hidden flag for a given sheet.
+         * Note that a sheet could instead be
+         *  set to be very hidden, which is different
+         *  ({@link #isSheetVeryHidden(int)})
+         *
+         * @param sheetnum the sheet number (0 based)
+         * @return True if sheet is hidden
+         * @since 3.16 beta 2
+         */
+        public SheetVisibility GetSheetVisibility(int sheetnum)
+        {
+            BoundSheetRecord bsr = GetBoundSheetRec(sheetnum);
+            if(bsr.IsVeryHidden)
+            {
+                return SheetVisibility.VeryHidden;
+            }
+            if(bsr.IsHidden)
+            {
+                return SheetVisibility.Hidden;
+            }
+            return SheetVisibility.Visible;
+        }
+
         /**
          * Hide or Unhide a sheet
          * 
@@ -784,40 +809,19 @@ public bool IsSheetVeryHidden(int sheetnum)
 
         public void SetSheetHidden(int sheetnum, bool hidden)
         {
-            BoundSheetRecord bsr = boundsheets[sheetnum];
-            bsr.IsHidden=hidden;
+            SetSheetHidden(sheetnum, hidden ? SheetVisibility.Hidden : SheetVisibility.Visible);
         }
         /**
- * Hide or unhide a sheet.
- *  0 = not hidden
- *  1 = hidden
- *  2 = very hidden.
- * 
- * @param sheetnum The sheet number
- * @param hidden 0 for not hidden, 1 for hidden, 2 for very hidden
- */
-        public void SetSheetHidden(int sheetnum, int hidden)
+         * Hide or unhide a sheet.
+         * 
+         * @param sheetnum The sheet number
+         * @param visibility the sheet visibility to set (visible, hidden, very hidden)
+         */
+        public void SetSheetHidden(int sheetnum, SheetVisibility visibility)
         {
             BoundSheetRecord bsr = GetBoundSheetRec(sheetnum);
-            bool h = false;
-            bool vh = false;
-            if (hidden == 0)
-            {
-            }
-            else if (hidden == 1)
-            {
-                h = true;
-            }
-            else if (hidden == 2)
-            {
-                vh = true;
-            }
-            else
-            {
-                throw new ArgumentException("Invalid hidden flag " + hidden + " given, must be 0, 1 or 2");
-            }
-            bsr.IsHidden = (h);
-            bsr.IsVeryHidden = (vh);
+            bsr.IsHidden = visibility == SheetVisibility.Hidden;
+            bsr.IsVeryHidden = visibility == SheetVisibility.VeryHidden;
         }
         /**
          * Get the sheet's index

main/HSSF/UserModel/HSSFWorkbook.cs

@@ -759,32 +759,57 @@ public bool IsSheetVeryHidden(int sheetIx)
             ValidateSheetIndex(sheetIx);
             return workbook.IsSheetVeryHidden(sheetIx);
         }
+
+        public SheetVisibility GetSheetVisibility(int sheetIx)
+        {
+            return workbook.GetSheetVisibility(sheetIx);
+        }
+
         /// <summary>
         /// Hide or Unhide a sheet
         /// </summary>
         /// <param name="sheetIx">The sheet index</param>
-        /// <param name="hidden">True to mark the sheet as hidden, false otherwise</param>
-        public void SetSheetHidden(int sheetIx, SheetState hidden)
+        /// <param name="hidden"></param>
+        [Obsolete]
+        public void SetSheetHidden(int sheetIx, SheetVisibility hidden)
         {
-            ValidateSheetIndex(sheetIx);
-            WorkbookUtil.ValidateSheetState(hidden);
-            workbook.SetSheetHidden(sheetIx, (int)hidden);
+            SetSheetVisibility(sheetIx, hidden);
         }
         /// <summary>
         /// Hide or unhide a sheet.
         /// </summary>
         /// <param name="sheetIx">The sheet number</param>
         /// <param name="hidden">0 for not hidden, 1 for hidden, 2 for very hidden</param>
+        [Obsolete]
         public void SetSheetHidden(int sheetIx, int hidden)
         {
-            ValidateSheetIndex(sheetIx);
-            workbook.SetSheetHidden(sheetIx, hidden);
+            switch(hidden)
+            {
+                case 0:
+                    SetSheetVisibility(sheetIx, SheetVisibility.Visible);
+                    break;
+                case 1:
+                    SetSheetVisibility(sheetIx, SheetVisibility.Hidden);
+                    break;
+                case 2:
+                    SetSheetVisibility(sheetIx, SheetVisibility.VeryHidden);
+                    break;
+                default:
+                    throw new ArgumentException("Invalid sheet state : " + hidden + "\n" +
+                            "Sheet state must beone of the Workbook.SHEET_STATE_* constants");
+            }
         }
         public void SetSheetHidden(int sheetIx, bool hidden)
+        {
+            SetSheetVisibility(sheetIx, hidden ? SheetVisibility.Hidden : SheetVisibility.Visible);
+        }
+
+        public void SetSheetVisibility(int sheetIx, SheetVisibility visibility)
         {
             ValidateSheetIndex(sheetIx);
-            workbook.SetSheetHidden(sheetIx, hidden);
+            workbook.SetSheetHidden(sheetIx, visibility);
         }
+
         /// <summary>
         /// Returns the index of the sheet by his name
         /// </summary>

main/SS/UserModel/SheetVisibility.cs

@@ -0,0 +1,45 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for Additional information regarding copyright ownership.
+   The ASF licenses this file to You 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.
+==================================================================== */
+
+namespace NPOI.SS.UserModel
+{
+    /// <summary>
+    /// Specifies sheet visibility
+    /// </summary>
+    public enum SheetVisibility : int
+    {
+        /// <summary>
+        /// Indicates the sheet is visible.
+        /// </summary>
+        Visible = 0,
+
+        /// <summary>
+        /// Indicates the book window is hidden, but can be shown by the user via the user interface.
+        /// </summary>
+        Hidden = 1,
+
+        /// <summary>
+        /// Indicates the sheet is hidden and cannot be shown in the user interface (UI).
+        /// </summary>
+        /// <remarks>
+        /// In Excel this state is only available programmatically in VBA:
+        /// ThisWorkbook.Sheets("MySheetName").Visible = xlSheetVeryHidden
+        /// 
+        /// </remarks>
+        VeryHidden = 2
+    }
+}

main/SS/UserModel/Workbook.cs

@@ -24,29 +24,6 @@ namespace NPOI.SS.UserModel
     using System.Collections.Generic;
     using NPOI.Util;
 
-    public enum SheetState : int
-    {
-        /// <summary>
-        /// Indicates the sheet is visible.
-        /// </summary>
-        Visible = 0,
-
-        /// <summary>
-        /// Indicates the book window is hidden, but can be shown by the user via the user interface.
-        /// </summary>
-        Hidden = 1,
-
-        /// <summary>
-        /// Indicates the sheet is hidden and cannot be shown in the user interface (UI).
-        /// </summary>
-        /// <remarks>
-        /// In Excel this state is only available programmatically in VBA:
-        /// ThisWorkbook.Sheets("MySheetName").Visible = xlSheetVeryHidden
-        /// 
-        /// </remarks>
-        VeryHidden = 2
-    }
-
     /// <summary>
     /// High level interface of a Excel workbook.  This is the first object most users 
     /// will construct whether they are reading or writing a workbook.  It is also the
@@ -416,7 +393,7 @@ public interface IWorkbook : ICloseable, IDisposable
          * @param sheetIx the sheet index (0-based)
          * @param hidden True to mark the sheet as hidden, false otherwise
          */
-        void SetSheetHidden(int sheetIx, SheetState hidden);
+        void SetSheetHidden(int sheetIx, SheetVisibility hidden);
 
         /**
          * Hide or unhide a sheet.
@@ -428,8 +405,30 @@ public interface IWorkbook : ICloseable, IDisposable
          * @param sheetIx The sheet number
          * @param hidden 0 for not hidden, 1 for hidden, 2 for very hidden
          */
+        [Obsolete]
         void SetSheetHidden(int sheetIx, int hidden);
 
+        /**
+         * Get the visibility (visible, hidden, very hidden) of a sheet in this workbook
+         *
+         * @param sheetIx  the index of the sheet
+         * @return the sheet visibility
+         * @since POI 3.16 beta 2
+         */
+        SheetVisibility GetSheetVisibility(int sheetIx);
+
+        /**
+         * Hide or unhide a sheet.
+         *
+         * Please note that the sheet currently set as active sheet (sheet 0 in a newly 
+         * created workbook or the one set via setActiveSheet()) cannot be hidden.
+         *  
+         * @param sheetIx     the sheet index (0-based)
+         * @param visibility  the sheet visibility to set
+         * @since POI 3.16 beta 2
+         */
+        void SetSheetVisibility(int sheetIx, SheetVisibility visibility);
+
         /// <summary>
         /// Register a new toolpack in this workbook.
         /// </summary>
@@ -444,7 +443,7 @@ public interface IWorkbook : ICloseable, IDisposable
         /// <returns>True if the date systems used in the workbook starts in 1904</returns>
         bool IsDate1904();
 
-        void Close();
+        //void Close();
 
         /// <summary>
         /// Returns the spreadsheet version (EXCLE97) of this workbook