/// <summary>
/// Get the primary key of a given <see cref="Type"/>
/// </summary>
/// <param name="model"></param>
/// <param name="schema"></param>
/// <returns></returns>
public static PropertyInfo GetPrimaryKey(this DBSchema schema, Type model)
{
// Get the DBTable containing the constraints for the dbcontext
var table = schema.GetType().GetMethod("Model").MakeGenericMethod(model).Invoke(schema, null);
// Return the type of the primary key
return((PropertyInfo)table.GetType().GetProperty("PrimaryKey").GetValue(table));
}
/// <summary>
/// Creates a new instance of an object to reflect the changes between the remote and local items.
/// This item includes the changes plus the primary key value (unchanged).
/// </summary>
/// <param name="item1">The <see cref="object"/> representing the remote item</param>
/// <param name="item2">The <see cref="object"/> representing the local item</param>
/// <returns></returns>
private object DBCreateUpdateItem(object item1, object item2, DBSchema schema)
{
// Get the type of model
Type modelType = item1.GetType();
// Create a new instance of the model
var updatedItem = Activator.CreateInstance(modelType);
// Test the property values
foreach (var prop in modelType.GetProperties())
{
if (schema.GetPrimaryKey(modelType) == prop)
{
prop.SetValue(updatedItem, prop.GetValue(item2));
}
else
{
switch (prop.PropertyType.ToString())
{
case "System.Guid":
case "System.Nullable`1[System.Guid]":
if (Guid.Parse(prop.GetValue(item1).ToString()).CompareTo(Guid.Parse(prop.GetValue(item2).ToString())) != 0)
{
prop.SetValue(updatedItem, prop.GetValue(item2) ?? prop.PropertyType.GetDefault());
}
break;
case "System.Boolean":
case "System.Nullable`1[System.Boolean]":
if ((prop.GetValue(item1) as bool?).GetValueOrDefault() != (prop.GetValue(item2) as bool?).GetValueOrDefault())
{
prop.SetValue(updatedItem, prop.GetValue(item2) ?? prop.PropertyType.GetDefault());
}
break;
case "System.DateTimeOffset":
case "System.Nullable`1[System.DateTimeOffset]":
if (DateTimeOffset.Compare((DateTimeOffset)prop.GetValue(item1), (DateTimeOffset)prop.GetValue(item2)) != 0)
{
prop.SetValue(updatedItem, prop.GetValue(item2) ?? prop.PropertyType.GetDefault());
}
break;
default:
if (prop.GetValue(item1) != prop.GetValue(item2))
{
prop.SetValue(updatedItem, prop.GetValue(item2) ?? prop.PropertyType.GetDefault());
}
break;
}
}
}
// Return the updated item
return(updatedItem);
}
/// <summary>
/// Gets wether the <see cref="PropertyInfo"/> given is the Primary Key in the given Schema
/// </summary>
/// <param name="propertyInfo">The <see cref="PropertyInfo"/> to check</param>
/// <param name="Schema">The Schema to use</param>
/// <param name="type">The model for wich we're running the action</param>
/// <returns></returns>
public static bool IsPrimaryKey(this DBSchema Schema, PropertyInfo propertyInfo, Type model)
{
var output = Schema.GetType().GetMethod("Model").MakeGenericMethod(model).Invoke(Schema, null);
if ((PropertyInfo)output.GetType().GetProperty("PrimaryKey").GetValue(output) == propertyInfo)
{
return(true);
}
return(false);
}
/// <summary>
/// Gets the value of the primary key property on a given object based on a Schema
/// </summary>
/// <param name="obj">The object to get the property value of the primary key from</param>
/// <param name="Schema">The schema to check the primary key against</param>
/// <returns><see cref="null"/> if the given object's primary key is the value of <see cref="null"/></returns>
public static object GetPrimaryKeyValue(this DBSchema Schema, object obj)
{
foreach (var prop in obj.GetType().GetProperties())
{
if (Schema.IsPrimaryKey(prop, obj.GetType()))
{
return(prop.GetValue(obj));
}
}
// Should never be reached
return(null);
}
/// <summary>
/// Gets wether the value of the primary key of the given object is set based on a schema
/// </summary>
/// <param name="obj">The object to check</param>
/// <param name="Schema">The schema to check against</param>
/// <returns></returns>
public static bool HasPrimaryKeyValue(this DBSchema Schema, object obj)
{
foreach (var prop in obj.GetType().GetProperties())
{
if (Schema.IsPrimaryKey(prop, obj.GetType()))
{
if (prop.GetValue(obj) != null)
{
return(true);
}
}
}
return(false);
}
/// <summary>
///
/// </summary>
/// <param name="Schema"></param>
/// <param name="obj"></param>
/// <returns></returns>
public static bool RequiredValuesCorrect(this DBSchema Schema, object obj)
{
bool retval = true;
var output = Schema.GetType().GetMethod("Model").MakeGenericMethod(obj.GetType()).Invoke(Schema, null);
HashSet <MemberInfo> requiredProps = (HashSet <MemberInfo>)output.GetType().GetProperty("RequiredProperties").GetValue(output);
foreach (var prop in obj.GetType().GetProperties())
{
if (requiredProps.Contains(prop))
{
if ((requiredProps.Where(m => m == prop).First() as PropertyInfo)?.GetValue(obj) == null)
{
retval = false;
}
}
}
return(retval);
}
/// <summary>
///
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <param name="action"></param>
/// <param name="item"></param>
/// <param name="schema"></param>
internal async Task RunAction <TModel>(DBAction action, TModel item, DBSchema schema) where TModel : class, new()
{
// Get primary key property info
var pk = schema.GetPrimaryKey(item.GetType());
switch (action)
{
case DBAction.Push:
await Push(item);
break;
case DBAction.Remove:
var rmethod = GetType().GetMethod(nameof(Remove));
var rgenMethod = rmethod.MakeGenericMethod(item.GetType());
Action <TModel> rwhere = i => pk.SetValue(i, pk.GetValue(item));
var t1 = (Task)rgenMethod.Invoke(this, new object[] { rwhere });
await t1;
break;
case DBAction.Update:
var umethod = GetType().GetMethod(nameof(Update));
var ugenMethod = umethod.MakeGenericMethod(item.GetType());
Action <TModel> uwhere = i =>
{
pk.SetValue(i, pk.GetValue(item));
foreach (var prop in i.GetType().GetProperties())
{
if (prop.GetValue(item) != null && prop != pk)
{
prop.SetValue(i, prop.GetValue(item));
}
}
};
var t2 = (Task)ugenMethod.Invoke(this, new object[] { uwhere });
await t2;
break;
default: break;
}
}