/// <summary>
/// 实体的属性描述
/// </summary>
/// <param name="property">属性信息</param>
public EntityPropertyDescriptor(PropertyInfo property)
: base(property)
{
var typeAttr = property.GetCustomAttribute <ColumnTypeAttribute>();
if (typeAttr != null)
{
this.ColumnType = typeAttr.ColumnType;
}
var nameAttr = property.GetCustomAttribute <ColumnNameAttribute>();
if (nameAttr != null)
{
this.Name = LineProtocolUtil.Encode(nameAttr.Name);
}
this.Utf8Name = Encoding.UTF8.GetBytes(this.Name);
var type = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;
if (this.ColumnType == ColumnType.Timestamp)
{
this.valueConverter = CreateTimestampConverter(type);
}
else if (this.ColumnType == ColumnType.Field)
{
this.valueConverter = LineProtocolUtil.CreateFieldValueConverter(type);
}
else // 标签
{
this.valueConverter = value => LineProtocolUtil.Encode(value?.ToString());
}
}
/// <summary>
/// 获取时间戳转换器
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
private Func <object?, string?> CreateTimestampConverter(Type type)
{
if (type == typeof(DateTime))
{
return(value => LineProtocolUtil.GetNsTimestamp((DateTime?)value).ToString());
}
if (type == typeof(DateTimeOffset))
{
return(value => LineProtocolUtil.GetNsTimestamp((DateTimeOffset?)value)?.ToString());
}
throw new NotSupportedException($"属性{type} {this.Name}不支持转换为Timestamp");
}