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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
namespace Kaleida.ServiceMonitor.Model.Runtime
{
public class ReflectionOperationHtmlHelpBuilder
{
public static string GetOperationsHtmlHelp(RuntimeEnvironment runtimeEnvironment)
{
try
{
var summary = new StringBuilder();
summary.Append("<html>");
summary.Append("<head><style>");
summary.Append("h1{font-size:12px;font-family:Sans-Serif;} li{font-size:10px;font-family:Sans-Serif;}");
summary.Append("</style></head>");
summary.Append("<body>");
summary.Append("<h1>Request Types</h1>");
summary.Append("<ul>");
summary.Append(String.Concat(runtimeEnvironment.PreparedResponseTypes.Select(BuildOperationHtmlSummary)));
summary.Append("</ul>");
summary.Append("<h1>Response Handlers</h1>");
summary.Append("<ul>");
summary.Append(String.Concat(runtimeEnvironment.ResponseHandlerTypes.Select(BuildOperationHtmlSummary)));
summary.Append("</ul>");
summary.Append("</body></html>");
return summary.ToString();
}
catch (Exception exception)
{
return "Error retrieving operation summary: " + exception.Message;
}
}
private static string BuildOperationHtmlSummary(Type type)
{
var summary = new StringBuilder();
var constructors = type.GetOperationConstructors();
foreach (var constructor in constructors)
{
var parameters = constructor.GetParameters();
var description = GetHtmlDescription(type, parameters);
summary.Append("<li>");
summary.AppendFormat("<b>{0}</b> {1}", type.Name.ToDashSeparated(), String.Join(", ", GetHtmlParameterNames(parameters)));
if (description != "")
{
summary.AppendFormat(" - {0}", description);
}
summary.Append("</li>");
}
return summary.ToString();
}
private static string GetHtmlDescription(Type type, IEnumerable<ParameterInfo> parameters)
{
//TODO: use an attribute to contain the operation's general description rather than trying to build a specific instance,
// using possibly invalid arguments, just to retrieve it's instance-specific description
try
{
var instance = CreateInstance(type, GetHtmlParameterNames(parameters).ToList());
return (string)instance.GetType().GetProperty("Description").GetValue(instance, new object[0]);
}
catch (Exception)
{
return "";
}
}
private static object CreateInstance(Type type, IEnumerable<string> arguments)
{
try
{
return Activator.CreateInstance(type, arguments.Select(i => (object) i).ToArray());
}
catch (TargetInvocationException exception)
{
throw exception.InnerException;
}
}
private static IEnumerable<string> GetHtmlParameterNames(IEnumerable<ParameterInfo> parameters)
{
return parameters.Select(i => "<" + i.Name.ToDashSeparated() + ">");
}
}
}
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Stuart Wheelwright is the Principal Architect and Software Developer at
BlackJet Software Ltd.
He has over 16 years commercial experience producing robust, maintainable, web-based solutions and bespoke systems for Microsoft platforms.
His latest project is
Shopping UK, an elegantly simple shopping list for iPhone.
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