public Ledger LoadLedger()
{
Ledger ledger = new Ledger();
FileInfo fi = new FileInfo( filename );
if( !fi.Exists ) return ledger;
OnlineTransactionStorageXml ostorage = new OnlineTransactionStorageXml();
Version version = new Version( 1, 0 );
// I'm not precisely sure why I chose to parse the XML manually
// instead of using XmlSerializer.
// I guess I just didn't want to markup my classes with Xml tags.
StreamReader reader = File.OpenText( filename );
try
{
XmlTextReader xmlReader = new XmlTextReader( reader );
try
{
while( xmlReader.Read() )
{
switch( xmlReader.NodeType )
{
case XmlNodeType.Element:
switch( xmlReader.Name )
{
case "MergeDate":
ledger.MergeDate = DateTime.Parse( xmlReader.ReadString() );
break;
case "Ledger":
version = new Version( xmlReader.GetAttribute( "Version" ) );
break;
case "Accounts":
break;
case "Account":
Account account = DeserializeAccount( xmlReader, version );
account.Ledger = ledger;
// Verify that we are not adding any duplicate Ids or Names
Account testAccount = ledger.FindAccount( account.Id );
if( testAccount != null )
throw new ApplicationException( "There is already an account with Id " + account.Id );
testAccount = ledger.FindAccount( account.Name );
if( testAccount != null )
throw new ApplicationException( "There is already an account named " + account.Name );
// Passed validation, add the account
ledger.Accounts.Add( account );
break;
case "Transactions":
break;
case "Transaction":
Transaction trans = DeserializeTransaction( xmlReader, version, ledger );
// Migrate from deprecated versions
trans.Migrate( version );
// Validate the transaction
trans.Validate();
if( trans.Id != 0 )
{
// Ensure no other transactions with the same Id are in the ledger
Transaction testTrans = ledger.GetTransaction( trans.Id );
if( testTrans != null )
throw new ApplicationException( "There is already a transaction with Id " + trans.Id );
}
ledger.AddTransaction( trans );
break;
case "MissingOnlineTransactions":
break;
case "OnlineTransaction":
OnlineTransaction otrans = ostorage.DeserializeTransaction( xmlReader, version );
ledger.MissingTransactions.Add( otrans );
break;
case "RecurringTransactions":
break;
case "RecurringTransaction":
RecurringTransaction rtrans = DeserializeRecurringTransaction( xmlReader, version, ledger );
ledger.RecurringTransactions.Add( rtrans );
break;
}
break;
}
}
}
finally
{
xmlReader.Close();
}
}
finally
{
reader.Close();
}
AssignTransactionIdentifiers( ledger );
AssignLineItemIdentifiers( ledger );
ValidateIdentifierLinks( ledger );
ledger.ValidateReferentialIntegrity();
// Set load date so we can determine if data in memory is stale
ledger.LoadDate = DateTime.Now;
return ledger;
}
/// <summary>
/// Deserialize from an XML reader into a Transaction object.
/// </summary>
/// <param name="xmlReader">XmlReader to deserialize from.</param>
/// <param name="ledger">Parent Ledger object.</param>
/// <returns>A Transaction object.</returns>
public Transaction DeserializeTransaction( XmlReader xmlReader, Version version, Ledger ledger )
{
if( xmlReader.NodeType != XmlNodeType.Element || xmlReader.Name != "Transaction" )
throw new ApplicationException( "Needs a Transaction node to deserialize an transaction object." );
OnlineTransactionStorageXml ostorage = new OnlineTransactionStorageXml();
Transaction trans = new Transaction();
if( xmlReader.GetAttribute( "Id" ) != null )
trans.Id = Int32.Parse( xmlReader.GetAttribute( "Id" ) );
string voidAttribute = xmlReader.GetAttribute( "Void" );
string pendingAttribute = xmlReader.GetAttribute( "Pending" );
//string reconciledAttribute = xmlReader.GetAttribute( "Reconciled" );
string recurringAttribute = xmlReader.GetAttribute( "Recurring" );
// What's the best way to do a case-insensitive string compare?
// Options:
// x.Equals( y, StringComparison.OrdinalIgnoreCase)
// x.ToLower() == y.ToLower()
// string.Compare( x, y, true );
// string.Compare( x, y, StringComparison.OrdinalIgnoreCase );
if( string.Compare( voidAttribute, "true", StringComparison.OrdinalIgnoreCase ) == 0 )
trans.Flags |= TransactionFlags.Void;
if( string.Compare( pendingAttribute, "true", StringComparison.OrdinalIgnoreCase ) == 0 )
trans.Flags |= TransactionFlags.Pending;
//if( string.Compare( reconciledAttribute, "true", StringComparison.OrdinalIgnoreCase ) == 0 )
// trans.Flags |= TransactionFlags.Reconciled;
if( string.Compare( recurringAttribute, "true", StringComparison.OrdinalIgnoreCase ) == 0 )
trans.Flags |= TransactionFlags.Recurring;
bool accountShortcut = false;
LineItem lineItem = null;
while( xmlReader.Read() )
{
string accountName = null;
Account account = null;
string categoryName = null;
Category category = null;
int accountId = 0;
decimal amount = 0;
string memo = null;
switch( xmlReader.NodeType )
{
case XmlNodeType.Element:
switch( xmlReader.Name )
{
case "Date":
trans.Date = DateTime.Parse( xmlReader.ReadString() );
break;
case "Amount":
trans.Amount = Decimal.Parse( xmlReader.ReadString() );
break;
case "Description":
trans.Description = xmlReader.ReadString();
break;
case "Memo":
trans.Memo = xmlReader.ReadString();
break;
case "Account":
// Shortcut for LineItems
accountShortcut = true;
accountName = xmlReader.ReadString();
account = ledger.FindAccount( accountName );
if( account == null )
throw new ArgumentException( "Reference to undefined account named " + accountName );
lineItem = new LineItemCredit( account, trans.Amount );
lineItem.Transaction = trans;
trans.LineItems.Add( lineItem );
break;
case "AccountId":
// Shortcut for LineItems
accountShortcut = true;
accountId = Int32.Parse( xmlReader.ReadString() );
account = ledger.FindAccount( accountId );
if( account == null )
throw new ArgumentException( "Reference to unknown account Id " + accountId );
lineItem = new LineItemCredit( account, trans.Amount );
trans.LineItems.Add( lineItem );
account = ledger.FindAccount( "Expenses" );
if( account == null )
throw new ArgumentException( "Expense account not defined." );
lineItem = new LineItemDebit( account, trans.Amount );
lineItem.Transaction = trans;
trans.LineItems.Add( lineItem );
break;
case "Category":
// Shortcut for LineItems
if( trans.LineItems.Count == 0 )
throw new ArgumentException( "Account or AccountId must be specified before Category element." );
LineItem[] debits = trans.GetDebitLineItems();
if( debits.Length != 1 )
throw new ArgumentException( "Category element can only be used when there is exactly one debit line item." );
account = ledger.FindAccount( "Expenses" );
categoryName = xmlReader.ReadString();
category = account.GetCategory( categoryName );
debits[0].CategoryObject = category;
break;
case "Credit":
if( accountShortcut )
throw new ArgumentException( "LineItems not expected when using Account/Category elements." );
if( version == new Version( 1, 0 ) )
{
throw new ApplicationException( "Version 1.0 data files are no longer supported." );
}
else if( version >= new Version( 1, 1 ) )
{
if( xmlReader.GetAttribute( "AccountId" ) != null )
{
accountId = Int32.Parse( xmlReader.GetAttribute( "AccountId" ) );
account = ledger.FindAccount( accountId );
}
else
{
account = ledger.FindAccount( xmlReader.GetAttribute( "Account" ) );
if( account == null )
throw new ArgumentException( "Reference to undefined account named " + xmlReader.GetAttribute( "Account" ) );
accountId = account.Id;
}
if( xmlReader.GetAttribute( "Category" ) != null )
category = account.GetCategory( xmlReader.GetAttribute( "Category" ) );
if( xmlReader.GetAttribute( "Amount" ) != null )
amount = Decimal.Parse( xmlReader.GetAttribute( "Amount" ) );
else
amount = trans.Amount;
if( version >= new Version( 1, 2 ) )
memo = xmlReader.GetAttribute( "Memo" );
else
memo = xmlReader.ReadString();
}
lineItem = new LineItemCredit( account, amount, category );
lineItem.Transaction = trans;
lineItem.Memo = memo;
lineItem.Number = xmlReader.GetAttribute( "Number" ); // could be null
if( xmlReader.GetAttribute( "Reconciled" ) != null )
lineItem.IsReconciled = (xmlReader.GetAttribute( "Reconciled" ).ToLower() == "true");
if( xmlReader.GetAttribute( "Id" ) != null )
lineItem.Id = int.Parse( xmlReader.GetAttribute( "Id" ) );
trans.LineItems.Add( lineItem );
break;
case "Debit":
if( accountShortcut )
throw new ArgumentException( "LineItems not expected when using Account/Category elements." );
if( version == new Version( 1, 0 ) )
{
throw new ApplicationException( "Version 1.0 data files are no longer supported." );
}
else if( version >= new Version( 1, 1 ) )
{
if( xmlReader.GetAttribute( "AccountId" ) != null )
{
accountId = Int32.Parse( xmlReader.GetAttribute( "AccountId" ) );
account = ledger.FindAccount( accountId );
}
else
{
account = ledger.FindAccount( xmlReader.GetAttribute( "Account" ) );
if( account == null )
throw new ArgumentException( "Reference to undefined account named " + xmlReader.GetAttribute( "Account" ) );
accountId = account.Id;
}
if( xmlReader.GetAttribute( "Category" ) != null )
category = account.GetCategory( xmlReader.GetAttribute( "Category" ) );
if( xmlReader.GetAttribute( "Amount" ) != null )
amount = Decimal.Parse( xmlReader.GetAttribute( "Amount" ) );
else
amount = trans.Amount;
if( version >= new Version( 1, 2 ) )
memo = xmlReader.GetAttribute( "Memo" );
else
memo = xmlReader.ReadString();
}
lineItem = new LineItemDebit( account, amount, category );
lineItem.Transaction = trans;
lineItem.Memo = memo;
lineItem.Number = xmlReader.GetAttribute( "Number" ); // could be null
if( xmlReader.GetAttribute( "Reconciled" ) != null )
lineItem.IsReconciled = (xmlReader.GetAttribute( "Reconciled" ).ToLower() == "true");
if( xmlReader.GetAttribute( "Id" ) != null )
lineItem.Id = int.Parse( xmlReader.GetAttribute( "Id" ) );
trans.LineItems.Add( lineItem );
break;
case "OnlineTransaction":
// We need to figure out whether this is a child of
// the Transaction element or a Credit/Debit element.
// Try examining xmlReader.Depth.
OnlineTransaction otrans = ostorage.DeserializeTransaction( xmlReader, version );
if( xmlReader.Depth > 3 )
{
// Associate with LineItem
lineItem.OnlineTransaction = otrans;
}
else
{
throw new StorageException( "OnlineTransaction nodes are no longer supported at the Transaction level." );
// Associate with Transaction (deprecated)
// trans.OnlineTransactions.Add( otrans );
}
break;
default:
break;
}
break;
case XmlNodeType.EndElement:
if( xmlReader.Name == "Transaction" )
return trans;
break;
}
}
trans.SetUnmodified();
return trans;
}