protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Value == null)
{
Clause.Append("NULL");
}
else
{
var value = QueryEscape.EscapeFieldOrTag(node.Value);
Clause.Append(value);
}
return(node);
}
internal PropertyExpressionInfo(string key, PropertyInfo property)
{
Property = property;
// Instance type of target entity class
ParameterExpression instanceParam = Expression.Parameter(typeof(TInfluxRow), "x");
// Instance type of target entity class
ParameterExpression valueParam = Expression.Parameter(typeof(object), "y");
// instance.Property
MemberExpression getProperty = Expression.Property(instanceParam, property);
// instance.Property = row[property]
BinaryExpression assignProperty = Expression.Assign(getProperty, Expression.Convert(valueParam, property.PropertyType));
var getterLambda = Expression.Lambda <Func <TInfluxRow, object> >(Expression.Convert(getProperty, typeof(object)), true, instanceParam);
GetValue = getterLambda.Compile();
var setterLambda = Expression.Lambda <Action <TInfluxRow, object> >(assignProperty, true, instanceParam, valueParam);
SetValue = setterLambda.Compile();
var type = property.PropertyType;
if (type.GetTypeInfo().IsGenericType&& type.GetGenericTypeDefinition() == typeof(Nullable <>))
{
// unwrap the nullable type
Type = type.GetGenericArguments()[0];
}
else
{
Type = type;
}
IsEnum = Type.GetTypeInfo().IsEnum;
IsDateTime = Type == typeof(DateTime);
LineProtocolEscapedKey = LineProtocolEscape.EscapeKey(key);
QueryProtocolEscapedKey = QueryEscape.EscapeKey(key);
Key = key;
// ensure we can convert between string/enum
if (IsEnum)
{
EnumToString = new Dictionary <Enum, string>();
StringToEnum = new Dictionary <string, Enum>();
var values = Enum.GetValues(Type);
foreach (Enum value in values)
{
string stringValue = value.ToString();
var memberInfo = Type.GetField(stringValue);
if (memberInfo != null)
{
var attribute = memberInfo.GetCustomAttribute <EnumMemberAttribute>();
if (attribute != null)
{
stringValue = attribute.Value;
}
}
EnumToString.Add(value, stringValue);
StringToEnum.Add(stringValue, value);
}
}
}
