Plugin was written by Heron Brink, however it will now maintained by Geoff Davis to help plugin developers write simple NHibernate mapping files.
General Info

License	As-is, use at your own risk
Type	free
Current version	1.0
Plugin Description

It runs as a separate .exe that loads in a plugin and generates a mapping file.
Using the plugin

Details on how to use the tool is available in: /wiki/spaces/SD41/pages/25822258 under Adding persistence using NHibernate.
Source Code

Source code available in SourceCommunity\SourcePlugins\MappingFileGenerator
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
using System.Xml;
using TIME.Core.Metadata;
namespace RiverSystem.Plugins.MappingFileGenerator
{
    public partial class MappingFileGenerator : Form
    {
        private XmlDocument doc;
        public MappingFileGenerator()
        {
            InitializeComponent();
        }
        private void fileChooser_OpenButtonClicked(object sender, TIME.Winforms.Filesystem.FileChooserEventArgs fcea)
        {
            Assembly ass = Assembly.LoadFrom(fcea.FullName);
            Type[] types = ass.GetTypes();
            bool foundSomething = false;
            var fieldsAndProperties = new Dictionary<string, string>();
            foreach (var tpe in types)
            {
                fieldsAndProperties.Clear();
                foreach (MemberInfo mi in
                    tpe.GetMembers(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
                {
                    if (mi.IsDefined(typeof(ParameterAttribute), true) && (mi.DeclaringType == tpe))
                    {
                        if (mi is FieldInfo)
                            fieldsAndProperties.Add(mi.Name, "field");
                        else if (mi is PropertyInfo)
                            fieldsAndProperties.Add(mi.Name, "property");
                        if (mi.Name.Length > 28)
                            lblColumnLengthWarning.Visible = true;
                    }
                }
                if (!foundSomething)
                {
                    doc = new XmlDocument();
                    string root = @"<?xml version=""1.0"" encoding=""utf-8"" ?><hibernate-mapping> </hibernate-mapping>";
                    doc.LoadXml(root);
                    XmlElement rootElement = doc.DocumentElement;
                    rootElement.SetAttribute("xmlns", "urn:nhibernate-mapping-2.2");
                    rootElement.SetAttribute("assembly", ass.GetName().Name);
                    rootElement.SetAttribute("assembly", ass.GetName().Name);
                    rootElement.SetAttribute("auto-import", "false");
                    foundSomething = true;
                }
                /*
                 * <subclass name="RiverSystem.Catchments.Models.CatchmentModels.AbstractCatchmentModel, RiverSystem" lazy="false" discriminator-value="AbstractCatchmentModel">
      <join table="AbstractCatchmentModel" fetch="select" >
        <key column="SubclassKey"  />
        <many-to-one name="Subcatchment" column="Subcatchment" cascade="save-update" access="property" fetch="select" />
      </join>
    </subclass>
                 */
                if (tpe.BaseType != null)
                {
                    if (!tpe.BaseType.FullName.ToLower().Contains("system.windows.forms")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.windows.forms.usercontrol")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.object")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.drawing.design.uitypeeditor")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.enum")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.valuetype")
                        && !tpe.BaseType.FullName.ToLower().Contains("system.multicastdelegate")
                        && !tpe.BaseType.FullName.ToLower().Contains("riversystem.scenariotask")
                        && (fieldsAndProperties.Count > 0))
                    {
                        XmlElement subClassElem = doc.CreateElement("subclass");
                        subClassElem.SetAttribute("name", tpe.Namespace + "." + tpe.Name);
                        subClassElem.SetAttribute("lazy", "false");
                        subClassElem.SetAttribute("discriminator-value", tpe.Name);
                        subClassElem.SetAttribute("extends", tpe.BaseType.FullName + ", " + tpe.BaseType.Assembly.GetName().Name);
                        XmlElement joinElem = doc.CreateElement("join");
                        string tableName = (tpe.Name.Length < 26) ? tpe.Name : tpe.Name.Substring(0, 25);
                        joinElem.SetAttribute("table", tableName);
                        joinElem.SetAttribute("fetch", "select");
                        subClassElem.AppendChild(joinElem);
                        XmlElement element = doc.CreateElement("key");
                        element.SetAttribute("column", "SubclassKey");
                        joinElem.AppendChild(element);
                        foreach (KeyValuePair<string, string> kvp in fieldsAndProperties)
                        {
                            element = doc.CreateElement("property");
                            element.SetAttribute("name", kvp.Key);
                            element.SetAttribute("column", kvp.Key);
                            element.SetAttribute("access", kvp.Value);
                            joinElem.AppendChild(element);
                        }
                        //Add the node to the document.
                        doc.DocumentElement.AppendChild(subClassElem);
                    }
                }
            }
            if (foundSomething)
            {
                TextWriter sw = new StringWriter();
                XmlTextWriter writer = new XmlTextWriter(sw);
                writer.Formatting = Formatting.Indented;
                doc.WriteTo(writer);
                writer.Flush();
                rtb.Text = sw.ToString();
            }
            else
            {
                rtb.Text = "No classes with properties/fields marked as 'Parameter' found";
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (saveFileDlg.ShowDialog() == DialogResult.OK)
            {
                doc.Save(saveFileDlg.FileName);
            }
        }
        private string TruncateUnique(string theString, List<String> theList, int maxLen)
        {
            if (theString.Length <= maxLen)
            {
                theList.Add(theString);
                return theString;
            }
            theString = theString.Substring(0, maxLen);
            int suffix = 0;
            string tmp = theString;
            while (theList.Contains(tmp))
            {
                suffix++;
                int numToReplace = 1 + (int)Math.Log10(suffix);
                tmp = theString.Substring(0, maxLen - numToReplace) + suffix.ToString();
            }
            theList.Add(tmp);
            return tmp;
        }
    }
}
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