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namespace CrupestApi.Commons.Crud;
public static class ColumnMetadataKeys
{
public const string ColumnName = nameof(ColumnAttribute.ColumnName);
public const string NotNull = nameof(ColumnAttribute.NotNull);
public const string IsPrimaryKey = nameof(ColumnAttribute.IsPrimaryKey);
public const string IsAutoIncrement = nameof(ColumnAttribute.IsAutoIncrement);
public const string Index = nameof(ColumnAttribute.Index);
/// <summary>
/// This will add hooks for string type column to coerce null to ""(empty string) when get or set. No effect on non-string type.
/// </summary>
public const string DefaultEmptyForString = nameof(ColumnAttribute.DefaultEmptyForString);
/// <summary>
/// This indicates that you take care of generate this column value when create entity. User calling the api can not specify the value.
/// </summary>
public const string ClientGenerate = nameof(ColumnAttribute.DefaultEmptyForString);
}
public interface IColumnMetadata
{
bool TryGetValue(string key, out object? value);
object? GetValueOrDefault(string key)
{
if (TryGetValue(key, out var value))
{
return value;
}
else
{
return null;
}
}
T? GetValueOrDefault<T>(string key)
{
return (T?)GetValueOrDefault(key);
}
object? this[string key]
{
get
{
if (TryGetValue(key, out var value))
{
return value;
}
else
{
throw new KeyNotFoundException("Key not found.");
}
}
}
}
public enum ColumnIndexType
{
None,
Unique,
NonUnique
}
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class ColumnAttribute : Attribute, IColumnMetadata
{
// if null, use the property name.
public string? ColumnName { get; init; }
// default false.
public bool NotNull { get; init; }
// default false
public bool IsPrimaryKey { get; init; }
// default false
public bool IsAutoIncrement { get; init; }
// default None
public ColumnIndexType Index { get; init; } = ColumnIndexType.None;
/// <see cref="ColumnMetadataKeys.DefaultEmptyForString"/>
public bool DefaultEmptyForString { get; init; }
/// <see cref="ColumnMetadataKeys.ClientGenerate"/>
public bool ClientGenerate { get; init; }
public bool TryGetValue(string key, out object? value)
{
var property = GetType().GetProperty(key);
if (property is null)
{
value = null;
return false;
}
value = property.GetValue(this);
return true;
}
}
public class AggregateColumnMetadata : IColumnMetadata
{
private IDictionary<string, object?> _own = new Dictionary<string, object?>();
private IList<IColumnMetadata> _children = new List<IColumnMetadata>();
public void Add(string key, object? value)
{
_own[key] = value;
}
public void Remove(string key)
{
_own.Remove(key);
}
public void Add(IColumnMetadata child)
{
_children.Add(child);
}
public void Remove(IColumnMetadata child)
{
_children.Remove(child);
}
public bool TryGetValue(string key, out object? value)
{
if (_own.ContainsKey(key))
{
value = _own[key];
return true;
}
bool found = false;
value = null;
foreach (var child in _children)
{
if (child.TryGetValue(key, out var tempValue))
{
value = tempValue;
found = true;
}
}
return found;
}
}
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