/// <summary>
/// Create a clone of the fixed length record ready to get updated by
/// the base settings
/// </summary>
/// <returns>new fixed length field definition just like this one minus
/// the base settings</returns>
protected override FieldBase CreateClone()
{
var res = new FixedLengthField {
Align = Align,
FieldLength = FieldLength,
FixedMode = FixedMode
};
return(res);
}
/// <summary>
/// Check the Attributes on the field and return a structure containing
/// the settings for this file.
/// </summary>
/// <param name="fi">Information about this field</param>
/// <param name="recordAttribute">Type of record we are reading</param>
/// <returns>Null if not used</returns>
public static FieldBase CreateField(FieldInfo fi, ITypedRecordAttribute recordAttribute)
{
FieldBase res = null;
MemberInfo mi = fi;
var memberName = $"The field: '{ fi.Name}'";
var fieldType = fi.FieldType;
var fieldFriendlyName = AutoPropertyName(fi);
if (string.IsNullOrEmpty(fieldFriendlyName) == false)
{
var prop = fi.DeclaringType.GetProperty(fieldFriendlyName);
if (prop != null)
{
memberName = $"The property: '{ prop.Name}'";
mi = prop;
}
else
{
fieldFriendlyName = null;
}
}
// If ignored, return null
#pragma warning disable 612,618 // disable obsolete warning
if (mi.IsDefined(typeof(FieldNotInFileAttribute), true) ||
mi.IsDefined(typeof(FieldIgnoredAttribute), true) ||
mi.IsDefined(typeof(FieldHiddenAttribute), true))
#pragma warning restore 612,618
{
return(null);
}
var attributes = (FieldAttribute[])mi.GetCustomAttributes(typeof(FieldAttribute), true);
// CHECK USAGE ERRORS !!!
// Fixed length record and no attributes at all
if (recordAttribute is FixedLengthRecordAttribute && attributes.Length == 0)
{
throw new BadUsageException($"{memberName} must be marked the FieldFixedLength attribute because the record class is marked with FixedLengthRecord.");
}
if (attributes.Length > 1)
{
throw new BadUsageException($"{memberName} has a FieldFixedLength and a FieldDelimiter attribute.");
}
if (recordAttribute is DelimitedRecordAttribute && mi.IsDefined(typeof(FieldAlignAttribute), false))
{
throw new BadUsageException($"{memberName} can't be marked with FieldAlign attribute, it is only valid for fixed length records and are used only for write purpose.");
}
if (fieldType.IsArray == false && mi.IsDefined(typeof(FieldArrayLengthAttribute), false))
{
throw new BadUsageException($"{memberName} can't be marked with FieldArrayLength attribute is only valid for array fields.");
}
// PROCESS IN NORMAL CONDITIONS
if (attributes.Length > 0)
{
var fieldAttribute = attributes[0];
var fixedLengthAttribute = fieldAttribute as FieldFixedLengthAttribute;
if (fixedLengthAttribute != null)
{
// Fixed Field
if (recordAttribute is DelimitedRecordAttribute)
{
throw new BadUsageException($"{memberName} can't be marked with FieldFixedLength attribute, it is only for the FixedLengthRecords not for delimited ones.");
}
var alignAttribute = mi.GetFirst <FieldAlignAttribute>();
res = new FixedLengthField(fi, fixedLengthAttribute.Length, alignAttribute);
((FixedLengthField)res).FixedMode = ((FixedLengthRecordAttribute)recordAttribute).FixedMode;
}
else if (fieldAttribute is FieldDelimiterAttribute)
{
// Delimited Field
if (recordAttribute is FixedLengthRecordAttribute)
{
throw new BadUsageException($"{memberName} can't be marked with FieldDelimiter attribute, it is only for DelimitedRecords not for fixed ones.");
}
res = new DelimitedField(fi, ((FieldDelimiterAttribute)fieldAttribute).Delimiter);
}
else
{
throw new BadUsageException(
$"Custom field attributes are not currently supported. Unknown attribute: {fieldAttribute.GetType().Name} on field: { fi.Name}");
}
}
else // attributes.Length == 0
{
var delimitedRecordAttribute = recordAttribute as DelimitedRecordAttribute;
if (delimitedRecordAttribute != null)
{
res = new DelimitedField(fi, delimitedRecordAttribute.Delimiter);
}
}
if (res != null)
{
// FieldDiscarded
res.Discarded = mi.IsDefined(typeof(FieldValueDiscardedAttribute), false);
// FieldTrim
mi.WorkWithFirst <FieldTrimAttribute>((x) => {
res.TrimMode = x.TrimMode;
res.TrimChars = x.TrimChars;
});
// FieldQuoted
mi.WorkWithFirst <FieldQuotedAttribute>((x) => {
if (res is FixedLengthField)
{
throw new BadUsageException($"{memberName} can't be marked with FieldQuoted attribute, it is only for the delimited records.");
}
((DelimitedField)res).QuoteChar = x.QuoteChar;
((DelimitedField)res).QuoteMode = x.QuoteMode;
((DelimitedField)res).QuoteMultiline = x.QuoteMultiline;
});
// FieldOrder
mi.WorkWithFirst <FieldOrderAttribute>(x => res.FieldOrder = x.Order);
// FieldCaption
mi.WorkWithFirst <FieldCaptionAttribute>(x => res.FieldCaption = x.Caption);
// FieldOptional
res.IsOptional = mi.IsDefined(typeof(FieldOptionalAttribute), false);
// FieldInNewLine
res.InNewLine = mi.IsDefined(typeof(FieldInNewLineAttribute), false);
// FieldNotEmpty
res.IsNotEmpty = mi.IsDefined(typeof(FieldNotEmptyAttribute), false);
// FieldArrayLength
if (fieldType.IsArray)
{
res.IsArray = true;
res.ArrayType = fieldType.GetElementType();
// MinValue indicates that there is no FieldArrayLength in the array
res.ArrayMinLength = int.MinValue;
res.ArrayMaxLength = int.MaxValue;
mi.WorkWithFirst <FieldArrayLengthAttribute>((x) => {
res.ArrayMinLength = x.MinLength;
res.ArrayMaxLength = x.MaxLength;
if (res.ArrayMaxLength < res.ArrayMinLength || res.ArrayMinLength < 0 || res.ArrayMaxLength <= 0)
{
throw new BadUsageException($"{memberName} has invalid length values in the [FieldArrayLength] attribute.");
}
});
}
}
if (string.IsNullOrEmpty(res.FieldFriendlyName))
{
res.FieldFriendlyName = res.FieldName;
}
return(res);
}