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using System.Collections.ObjectModel;
using System.Reflection;
using Pfz.Databasing.Tiers;
using Pfz.Extensions.DatabaseNameExtensions;
namespace Pfz.Databasing.BusinessRules
{
/// <summary>
/// Standard validator that verifies if a reference to a non-persisted
/// interface is valid. This is done by verifying if a record exist in any
/// of the persisted interfaces.
/// This validator is only enabled if the InheritanceTier is enabled.
/// </summary>
public sealed class HierarchyBeforeInsertUpdateRule:
Rule<IRecord>,
IBeforeApplyInsertRule<IRecord>,
IBeforeApplyUpdateRule<IRecord>
{
private static readonly MethodInfo fTryLoadByPrimaryKeyMethod = typeof(Record).GetMethod("TryLoadByPrimaryKey");
/// <summary>
/// Verifies if all the referenced records exist.
/// </summary>
/// <param name="connection"></param>
/// <param name="record"></param>
public override void Execute(BusinessRulesTier rulesTier, IDatabaseConnection connection, IRecord record)
{
if (!InheritanceTier.CanRunInheritanceValidators || !InheritanceTier.IsInheritanceTierEnabled)
return;
var type = record.GetType();
var referenceProperties = (ReadOnlyCollection<PropertyInfo>)type.GetField("NonPersistedReferenceProperties").GetValue(null);
foreach(var propertyInfo in referenceProperties)
{
var propertyValue = propertyInfo.GetValue(record, null);
if (propertyValue == null)
continue;
IRecord otherRecord = (IRecord)propertyValue;
object[] primaryKeyValues = otherRecord.GetPrimaryKeyValues();
var method = fTryLoadByPrimaryKeyMethod.MakeGenericMethod(propertyInfo.PropertyType);
object searchResult = method.Invoke(null, new object[]{primaryKeyValues});
if (searchResult == null)
ThreadErrors.AddError("Reference to record not found in database for property " + propertyInfo.GetDatabaseName() + ".");
}
}
}
}
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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).