MetadataCoreReader.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 System;
using System.IO;
using System.Xml;
using NanoXLSX.Interfaces;
using NanoXLSX.Interfaces.Reader;
using NanoXLSX.Registry;
using NanoXLSX.Registry.Attributes;
using NanoXLSX.Utils.Xml;
 
namespace NanoXLSX.Internal.Readers
{
    [NanoXlsxPlugIn(PlugInUUID = PlugInUUID.MetadataCoreReader)]
    public class MetadataCoreReader : IDocumentReader
    {
        private Stream stream;
 
        #region properties
        public virtual string DocumentType { get { return @"http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties"; } }

        public Workbook Workbook { get; set; }
        public IOptions Options { get; set; }
        public Action<Stream, Workbook, string, IOptions, int?> InlinePluginHandler { get; set; }
        #endregion
 
        #region constructors
        internal MetadataCoreReader()
        {
        }
 
        #endregion
 
        #region methods
        public void Init(Stream stream, Workbook workbook, IOptions readerOptions, Action<Stream, Workbook, string, IOptions, int?> inlinePluginHandler)
        {
            this.stream = stream;
            this.Workbook = workbook;
            this.Options = readerOptions;
            this.InlinePluginHandler = inlinePluginHandler;
        }

        public void Execute()
        {
            try
            {
                using (stream) // Close after processing
                {
                    Metadata metadata = Workbook.WorkbookMetadata;
                    using (XmlReader reader = XmlReader.Create(stream, XmlStreamUtils.CreateSettings()))
                    {
                        while (reader.Read())
                        {
                            if (reader.NodeType != XmlNodeType.Element)
                            {
                                continue;
                            }
                            if (XmlStreamUtils.IsElement(reader, "Category"))
                            {
                                metadata.Category = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "ContentStatus"))
                            {
                                metadata.ContentStatus = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "Creator"))
                            {
                                metadata.Creator = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "Description"))
                            {
                                metadata.Description = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "Keywords"))
                            {
                                metadata.Keywords = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "Subject"))
                            {
                                metadata.Subject = XmlStreamUtils.ReadElementText(reader);
                            }
                            else if (XmlStreamUtils.IsElement(reader, "Title"))
                            {
                                metadata.Title = XmlStreamUtils.ReadElementText(reader);
                            }
                        }
                        InlinePluginHandler?.Invoke(stream, Workbook, PlugInUUID.MetadataCoreInlineReader, Options, null);
                    }
                }
            }
            catch (Exception ex)
            {
                throw new IOException("The XML entry could not be read from the input stream. Please see the inner exception:", ex);
            }
 
        }
        #endregion
    }
}