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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading;
using Pfz.Databasing;
namespace Pfz.Extensions
{
/// <summary>
/// Provides extensions methods to get DatabaseName values for types and
/// properties.
/// </summary>
public static class PfzDatabaseTypeExtensions
{
/// <summary>
/// Gets the database name of a given type.
/// </summary>
public static string GetDatabaseName(this Type type)
{
if (type == null)
throw new ArgumentNullException("type");
var attribute = type.GetCustomAttribute<DatabaseNameAttribute>();
if (attribute != null)
return attribute.Value;
return type.Name;
}
/// <summary>
/// Gets the database name for a given property.
/// </summary>
public static string GetDatabaseName(this MemberInfo memberInfo)
{
if (memberInfo == null)
throw new ArgumentNullException("memberInfo");
var attribute = memberInfo.GetCustomAttribute<DatabaseNameAttribute>();
if (attribute != null)
return attribute.Value;
Type memberType = null;
switch(memberInfo.MemberType)
{
case MemberTypes.Property:
memberType = ((PropertyInfo)memberInfo).PropertyType;
break;
case MemberTypes.Field:
memberType = ((FieldInfo)memberInfo).FieldType;
break;
}
if (memberType != null)
if (typeof(IRecord).IsAssignableFrom(memberType))
return memberType.GetPrimaryKeyProperty().GetDatabaseName() + "_" + memberInfo.Name;
return memberInfo.Name;
}
private static Dictionary<Type, PropertyInfo> _primaryKeys = new Dictionary<Type, PropertyInfo>();
private static ReaderWriterLockSlim _primaryKeysLock = new ReaderWriterLockSlim();
/// <summary>
/// Gets the PrimaryKey property of the given type, or throws an exception if there is
/// not a PrimaryKey property.
/// </summary>
public static PropertyInfo GetPrimaryKeyProperty(this Type type)
{
if (type == null)
throw new ArgumentNullException("type");
PropertyInfo result;
using(_primaryKeysLock.ReadLock())
if (_primaryKeys.TryGetValue(type, out result))
return result;
using(_primaryKeysLock.UpgradeableLock())
{
if (_primaryKeys.TryGetValue(type, out result))
return result;
foreach(var propertyInfo in type.GetInterfaceProperties())
{
if (propertyInfo.ContainsCustomAttribute<PrimaryKeyAttribute>())
{
if (result != null)
throw new DatabaseException("Type " + type.FullName + " has more than one property marked with [PrimaryKey].");
result = propertyInfo;
}
}
if (result == null)
throw new DatabaseException("Type " + type.FullName + " does not have a primary key.");
if (typeof(IRecord).IsAssignableFrom(result.PropertyType))
throw new DatabaseException("Property " + result.DeclaringType.FullName + "." + result.Name + " is a record reference and a primary key. PrimaryKey properties can't be record references.");
using(_primaryKeysLock.WriteLock())
_primaryKeys.Add(type, result);
}
return result;
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).