CompatibilityProcessor.cs

/*
 * NanoXLSX is a small .NET library to generate and read XLSX (Microsoft Excel 2007 or newer) files in an easy and native way  
 * Copyright Raphael Stoeckli © 2026
 * This library is licensed under the MIT License.
 * You find a copy of the license in project folder or on: http://opensource.org/licenses/MIT
 */
 
using NanoXLSX.Exceptions;
using NanoXLSX.Interfaces.Writer;
using NanoXLSX.Registry;
using System;
 
namespace NanoXLSX.Internal.Writers
{
    internal class CompatibilityProcessor : IPluginWriteProcessor
    {
        public IWriteContext WriteContext { get; set; }
        public Action<IWriteContext, string> InlinePluginHandler { get; set; }

        public void Init(IWriteContext context, Action<IWriteContext, string> inlinePluginHandler)
        {
            this.WriteContext = context;
            this.InlinePluginHandler = inlinePluginHandler;
        }

        public void Execute()
        {
            // Possible injected compatibility checks or changes (e.g. enabling a feature by a plug-in)
            this.InlinePluginHandler?.Invoke(this.WriteContext, PlugInUUID.CompatibilityInlineProcessor); // DO NOT MOVE THIS TO THE END
            // -------------------------------------------
            CheckExternalLinks();
 
            // TODO add further compatibility checks of the core scope (in fo plug-ins are loaded) here
        }
 
        private void CheckExternalLinks()
        {
            bool externalLinksExist = WriteContext.Workbook.Features.ContainsExternalLinks;
            if (externalLinksExist && !WriteContext.IsFeaturePrepared(PlugInUUID.WriteExternalLinkFeature))
            {
                throw new NotSupportedContentException("The workbook contains external links in defined names or cell formulas, but no compatible writer plug-in is capable to write such links. " +
                    "Note: Consider adding the package NanoXLSX.Compatibility. ");
            }
        }
    }
}