/// <summary>
/// Returns an <see cref="IConvertible"/> primitive converted from the specified array <paramref name="value"/> of bytes.
/// </summary>
/// <typeparam name="T">The type of the expected return <paramref name="value"/> after conversion.</typeparam>
/// <param name="value">The value to convert into an <see cref="IConvertible"/>.</param>
/// <returns>An <see cref="IConvertible"/> primitive formed by n-bytes beginning at 0.</returns>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="value"/> is null.
/// </exception>
/// <exception cref="TypeArgumentException">
/// <typeparamref name="T"/> is outside the range of allowed types.<br/>
/// Allowed types are: <see cref="Boolean"/>, <see cref="Char"/>, <see cref="double"/>, <see cref="Int16"/>, <see cref="Int32"/>, <see cref="ushort"/>, <see cref="UInt32"/> and <see cref="UInt64"/>.
/// </exception>
public static T FromBytes <T>(byte[] value) where T : struct, IConvertible
{
Validator.ThrowIfNull(value, nameof(value));
if (BitConverter.IsLittleEndian)
{
Array.Reverse(value);
}
TypeCode code = TypeCodeConverter.FromType(typeof(T));
object result;
switch (code)
{
case TypeCode.Boolean:
result = BitConverter.ToBoolean(value, 0);
break;
case TypeCode.Char:
result = BitConverter.ToChar(value, 0);
break;
case TypeCode.Double:
result = BitConverter.ToDouble(value, 0);
break;
case TypeCode.Int16:
result = BitConverter.ToInt16(value, 0);
break;
case TypeCode.Int32:
result = BitConverter.ToInt32(value, 0);
break;
case TypeCode.Int64:
result = BitConverter.ToInt64(value, 0);
break;
case TypeCode.Single:
result = BitConverter.ToSingle(value, 0);
break;
case TypeCode.UInt16:
result = BitConverter.ToUInt16(value, 0);
break;
case TypeCode.UInt32:
result = BitConverter.ToUInt32(value, 0);
break;
case TypeCode.UInt64:
result = BitConverter.ToUInt64(value, 0);
break;
default:
throw new TypeArgumentException("T", string.Format(CultureInfo.InvariantCulture, "T appears to be of an invalid type. Expected type is one of the following: Boolean, Char, Double, Int16, Int32, Int64, UInt16, UInt32 or UInt64. Actually type was {0}.", code));
}
return((T)result);
}
/// <summary>
/// Validates if the specified <typeparamref name="T"/> is within the allowed range of numeric operands.
/// </summary>
/// <typeparam name="T">The type of the value for an operand operation.</typeparam>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <typeparamref name="T"/> is outside the range of allowed types.<br/>
/// Allowed types are: <see cref="Byte"/>, <see cref="Decimal"/>, <see cref="Double"/>, <see cref="Int16"/>, <see cref="Int32"/>, <see cref="Int64"/>, <see cref="SByte"/>, <see cref="Single"/>, <see cref="UInt16"/>, <see cref="UInt32"/> or <see cref="UInt64"/>.
/// </exception>
public static void ValidAsNumericOperand <T>() where T : struct, IComparable <T>, IEquatable <T>, IConvertible
{
Type valueType = typeof(T);
TypeCode valueCode = TypeCodeConverter.FromType(valueType);
switch (valueCode)
{
case TypeCode.Byte:
case TypeCode.Decimal:
case TypeCode.Double:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.SByte:
case TypeCode.Single:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
break;
default:
throw new TypeArgumentOutOfRangeException("T", string.Format(CultureInfo.InvariantCulture, "T appears to contain an invalid type. Expected type is numeric and must be one of the following: Byte, Decimal, Double, Int16, Int32, Int64, SByte, Single, UInt16, UInt32 or UInt64. Actually type was {0}.", valueType.Name));
}
}
/// <summary>
/// Parses the encapsulated instance of the specified <paramref name="wrapper"/> for a human-readable string value.
/// </summary>
/// <typeparam name="T">The type of the encapsulated instance of <paramref name="wrapper"/>.</typeparam>
/// <param name="wrapper">The wrapper object to parse the instance.</param>
/// <returns>A human-readable <see cref="string"/> representation of the wrapped instance in the <see cref="Wrapper{T}"/> object.</returns>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="wrapper"/> is null.
/// </exception>
public static string ParseInstance <T>(IWrapper <T> wrapper)
{
if (wrapper == null)
{
throw new ArgumentNullException(nameof(wrapper));
}
switch (TypeCodeConverter.FromType(wrapper.InstanceType))
{
case TypeCode.Boolean:
return(wrapper.Instance.ToString().ToLowerInvariant());
case TypeCode.Byte:
case TypeCode.Decimal:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.SByte:
case TypeCode.Single:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Double:
return(wrapper.InstanceAs <IConvertible>().ToString(CultureInfo.InvariantCulture));
case TypeCode.DateTime:
return(wrapper.InstanceAs <DateTime>().ToString("O", CultureInfo.InvariantCulture));
case TypeCode.String:
return(wrapper.Instance.ToString());
default:
if (TypeUtility.IsKeyValuePair(wrapper.InstanceType))
{
PropertyInfo keyProperty = wrapper.InstanceType.GetProperty("Key");
PropertyInfo valueProperty = wrapper.InstanceType.GetProperty("Value");
object keyValue = keyProperty.GetValue(wrapper.Instance, null) ?? "null";
object valueValue = valueProperty.GetValue(wrapper.Instance, null) ?? "null";
return(string.Format(CultureInfo.InvariantCulture, "[{0},{1}]", keyValue, valueValue));
}
if (TypeUtility.IsComparer(wrapper.InstanceType) ||
TypeUtility.IsEqualityComparer(wrapper.InstanceType))
{
return(StringConverter.FromType(wrapper.InstanceType));
}
switch (wrapper.InstanceType.Name.ToUpperInvariant())
{
case "BYTE[]":
return(Convert.ToBase64String(wrapper.InstanceAs <byte[]>()));
case "GUID":
return(wrapper.InstanceAs <Guid>(CultureInfo.InvariantCulture).ToString("D"));
case "RUNTIMETYPE":
return(StringConverter.FromType(wrapper.InstanceAs <Type>()));
case "URI":
return(wrapper.InstanceAs <Uri>().OriginalString);
default:
return(wrapper.Instance.ToString());
}
}
}
/// <summary>
/// Gets the underlying type code of the specified <paramref name="type"/>.
/// </summary>
/// <param name="type">The type whose underlying <see cref="TypeCode"/> to get.</param>
/// <returns>The code of the underlying type, or Empty if <paramref name="type"/> is null.</returns>
public static TypeCode AsCode(this Type type)
{
return(TypeCodeConverter.FromType(type));
}
/// <summary>
/// Computes a suitable hash code from the specified sequence of <paramref name="convertibles"/>.
/// </summary>
/// <param name="convertibles">A sequence of structs implementing the <see cref="IConvertible"/> interface.</param>
/// <returns>A 64-bit signed integer that is the hash code of <paramref name="convertibles"/>.</returns>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="convertibles"/> is null.
/// </exception>
public static long GetHashCode64 <T>(IEnumerable <T> convertibles) where T : IConvertible
{
if (convertibles == null)
{
throw new ArgumentNullException(nameof(convertibles));
}
TypeCode code = TypeCodeConverter.FromType(typeof(T));
unchecked
{
bool skipFnvPrimeMultiplication = false;
long hash = FnvOffset;
foreach (T convertible in convertibles)
{
switch (code)
{
case TypeCode.Boolean:
hash ^= convertible.ToByte(CultureInfo.InvariantCulture);
break;
case TypeCode.Char:
hash ^= convertible.ToChar(CultureInfo.InvariantCulture);
break;
case TypeCode.DateTime:
hash ^= unchecked ((long)convertible.ToDateTime(CultureInfo.InvariantCulture).Ticks);
break;
case TypeCode.Decimal:
hash ^= unchecked ((long)convertible.ToDecimal(CultureInfo.InvariantCulture));
break;
case TypeCode.Double:
hash ^= unchecked ((long)convertible.ToDouble(CultureInfo.InvariantCulture));
break;
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
hash ^= convertible.ToInt32(CultureInfo.InvariantCulture);
break;
case TypeCode.Int64:
hash ^= unchecked ((long)convertible.ToInt64(CultureInfo.InvariantCulture));
break;
case TypeCode.Byte:
case TypeCode.UInt16:
case TypeCode.UInt32:
hash ^= unchecked ((long)convertible.ToUInt32(CultureInfo.InvariantCulture));
break;
case TypeCode.UInt64:
hash ^= unchecked ((long)convertible.ToUInt64(CultureInfo.InvariantCulture));
break;
case TypeCode.Single:
hash ^= unchecked ((long)convertible.ToSingle(CultureInfo.InvariantCulture));
break;
case TypeCode.String:
string value = convertible as string;
if (value == null)
{
hash ^= HashCodeForNullValue;
}
else
{
for (int i = 0; i < value.Length; i++)
{
hash ^= value[i];
hash *= FnvPrime;
skipFnvPrimeMultiplication = true;
}
}
break;
}
if (!skipFnvPrimeMultiplication)
{
hash *= FnvPrime;
}
}
return(hash);
}
}
