/// <summary>Creates a single TargetType object given a record string.</summary>
/// <param name="text">Record string to deserialize.</param>
/// <returns>Newly created TargetType object.</returns>
/// <exception cref="ArgumentNullException">Thrown if text is null.</exception>
/// <exception cref="TextSerializationException">Thrown if the number of fields in the record doesn't match that in TargetType.</exception>
public TTargetType Deserialize(string text)
{
if (text == null)
{
throw new ArgumentNullException("text", "text cannot be null");
}
// Create the correct return objects depending on whether this is a value or reference type
// This makes a difference for reflection later on when populating the fields dynamically.
TTargetType returnObj = new TTargetType();
ValueType returnStruct = null;
if (_type.IsValueType)
{
object tempObj = returnObj;
returnStruct = (ValueType)tempObj;
}
// Parse the record into it's individual fields depending on the type of serializer this is
List <string> parseList = Parse(text);
int requiredCount = _textFields.Values.Count(attr => !attr.Optional);
if (parseList.Count < requiredCount || parseList.Count > _textFields.Count)
{
throw new TextSerializationException("TargetType field count doesn't match number of items in text");
}
// For each field that is parsed in the string, populate the correct corresponding field in the TargetType
TextFieldAttribute[] attributes = _textFields.Values.ToArray();
for (int i = 0; i < parseList.Count; i++)
{
TextFieldAttribute attr = attributes[i];
if (attr != null)
{
string strVal = Truncate(parseList[i], attr.Size);
// If there is a custom formatter, then use that to deserialize the string, otherwise use the default .NET behvavior.
object fieldObj = attr.Formatter != null?attr.Formatter.Deserialize(strVal) : Convert.ChangeType(strVal, attr.GetNativeType());
// Depending on whether the TargetType is a class or struct, you have to populate the fields differently
if (_type.IsValueType)
{
AssignToStruct(returnStruct, fieldObj, attr.Member);
}
else
{
AssignToClass(returnObj, fieldObj, attr.Member);
}
}
}
// If this was a value type, need to do a little more magic so can be returned properly
if (_type.IsValueType)
{
object tempObj = (object)returnStruct;
returnObj = (TTargetType)tempObj;
}
return(returnObj);
}
protected TextSerializer()
{
// Get the Reflection type for the Generic Argument
_type = GetType().GetGenericArguments()[0];
// Double check that the TextSerializableAttribute has been attached to the TargetType
object[] serAttrs = _type.GetCustomAttributes(typeof(TextSerializableAttribute), false);
if (serAttrs.Length == 0)
{
throw new TextSerializationException("TargetType must have a TextSerializableAttribute attached");
}
// Get all the public properties and fields on the class
MemberInfo[] members = _type.GetMembers(BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetField | BindingFlags.GetProperty);
foreach (MemberInfo member in members)
{
// Check to see if they've marked up this field/property with the attribute for serialization
object[] fieldAttrs = member.GetCustomAttributes(typeof(TextFieldAttribute), false);
if (fieldAttrs.Length > 0)
{
Type memberType;
if (member is FieldInfo)
{
memberType = ((FieldInfo)member).FieldType;
}
else if (member is PropertyInfo)
{
memberType = ((PropertyInfo)member).PropertyType;
}
else
{
throw new TextSerializationException("Invalid MemberInfo type encountered");
}
TextFieldAttribute textField = (TextFieldAttribute)fieldAttrs[0];
// Check for the AllowedValues Attribute and if it's there, store away the values into the other holder attribute
object[] allowedAttrs = member.GetCustomAttributes(typeof(AllowedValuesAttribute), false);
if (allowedAttrs.Length > 0)
{
AllowedValuesAttribute allowedAttr = (AllowedValuesAttribute)allowedAttrs[0];
textField.AllowedValues = allowedAttr.AllowedValues;
}
// If they don't override the name in the Attribute, use the MemberInfo name
if (string.IsNullOrEmpty(textField.Name))
{
textField.Name = member.Name;
}
textField.Member = member;
_textFields.Add(textField.Position, textField);
}
}
}
/// <summary>Serializes a single TargetType object into a properly formatted record string.</summary>
/// <param name="obj">Object to serialize</param>
/// <returns>Record string</returns>
/// <exception cref="TextSerializationException">Thrown if an invalid class member is encountered.</exception>
public string Serialize(TTargetType obj)
{
// First go through the object and get string representations of all the fields
List <string> fieldList = new List <string>();
for (int i = 0; i < _textFields.Count; i++)
{
TextFieldAttribute attr = _textFields[i];
object objValue;
// Get the object from the field
if (attr.Member is PropertyInfo)
{
objValue = ((PropertyInfo)attr.Member).GetValue(obj, null);
}
else if (attr.Member is FieldInfo)
{
objValue = ((FieldInfo)attr.Member).GetValue(obj);
}
else
{
throw new TextSerializationException("Invalid MemberInfo type encountered");
}
// Get the string representation for the object. If there is a custom formatter for this field, then
// use that, otherwise use the default ToString behavior.
string str = attr.Formatter != null?attr.Formatter.Serialize(objValue) : objValue.ToString();
// Truncate the string if required
fieldList.Add(Truncate(str, attr.Size));
}
// Now that all the strings are collected, put them together into a record string depending on the
// type of serializer that this is.
return(FormatOutput(fieldList));
}
