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Enum Mapper in C#
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public class EnumMapper : IDisposable | |
{ | |
readonly Dictionary<Type, Dictionary<string, object>> _stringsToEnums = | |
new Dictionary<Type, Dictionary<string, object>>( ) ; | |
readonly Dictionary<Type, Dictionary<int, string>> _enumNumbersToStrings = | |
new Dictionary<Type, Dictionary<int, string>>( ) ; | |
readonly ReaderWriterLockSlim _lock = new ReaderWriterLockSlim( ) ; | |
public object EnumFromString( Type type, string value ) | |
{ | |
populateIfNotPresent( type ) ; | |
return _stringsToEnums[ type ][ value ] ; | |
} | |
public string StringFromEnum( object theEnum ) | |
{ | |
Type typeOfEnum = theEnum.GetType( ) ; | |
populateIfNotPresent( typeOfEnum ) ; | |
return _enumNumbersToStrings[ typeOfEnum ][ (int) theEnum ] ; | |
} | |
void populateIfNotPresent( Type type ) | |
{ | |
_lock.EnterUpgradeableReadLock( ) ; | |
try | |
{ | |
if( !_stringsToEnums.ContainsKey( type ) ) | |
{ | |
_lock.EnterWriteLock( ) ; | |
try | |
{ | |
populate( type ) ; | |
} | |
finally | |
{ | |
_lock.ExitWriteLock( ) ; | |
} | |
} | |
} | |
finally | |
{ | |
_lock.ExitUpgradeableReadLock( ) ; | |
} | |
} | |
void populate( Type type ) | |
{ | |
Array values = Enum.GetValues( type ) ; | |
_stringsToEnums[ type ] = new Dictionary<string, object>( values.Length ) ; | |
_enumNumbersToStrings[ type ] = new Dictionary<int, string>( values.Length ) ; | |
for( int i = 0; i < values.Length; i++ ) | |
{ | |
object value = values.GetValue( i ) ; | |
_stringsToEnums[ type ].Add( value.ToString( ), value ) ; | |
_enumNumbersToStrings[ type ].Add( (int) value, value.ToString( ) ) ; | |
} | |
} | |
public void Dispose( ) | |
{ | |
_lock.Dispose( ) ; | |
} | |
} | |
} |
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