public MigrationSettings MergeWith(DefaultMigrationSettings settings)
{
if (settings == null)
{
return(null);
}
var merged = new MigrationSettings
{
Server = this.Server ?? settings.Server,
Port = this.Port ?? settings.Port,
Username = this.Username ?? settings.Username,
MySqlPassword = this.MySqlPassword ?? settings.MySqlPassword,
LitePassword = this.LitePassword ?? settings.LitePassword,
MySqlDatabase = this.MySqlDatabase,
LiteDatabase = this.LiteDatabase
};
CheckRequiredField(x => x.Server);
CheckRequiredField(x => x.Port);
CheckRequiredField(x => x.Username);
CheckRequiredField(x => x.MySqlDatabase);
CheckRequiredField(x => x.LiteDatabase);
return(merged);
void CheckRequiredField <T>(Expression <Func <MigrationSettings, T> > expr)
{
const string ExceptionMessage = "Missing required configuration setting";
if (!(expr.Body is MemberExpression member) || !(member.Member is PropertyInfo property))
{
throw new Exception("programmer is a dummy");
}
var jsonName = property.GetCustomAttribute <JsonPropertyAttribute>().PropertyName;
var lambda = expr.Compile();
var result = lambda.Invoke(merged);
if (lambda.Invoke(merged) == null)
{
throw new ArgumentException(ExceptionMessage, $"{property.Name} ({jsonName})");
}
}
}
public void Deconstruct(out MigrationSettings logon, out MigrationSettings chars, out MigrationSettings world)
{
logon = this.Logon;
chars = this.Chars;
world = this.World;
}