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using System;
namespace Apewer.Source
{
/// <summary>索引。</summary>
public sealed class TableIndex
{
/// <summary>索引名称。</summary>
public string Name { get; }
/// <summary>表。</summary>
public TableAttribute Table { get; }
/// <summary>索引字段。</summary>
public IndexAttribute[] Fields { get; }
/// <summary>创建索引实例。</summary>
/// <exception cref="ArgumentNullException"></exception>
internal TableIndex(string name, TableAttribute table, IndexAttribute[] fields)
{
if (name.IsEmpty()) throw new ArgumentNullException(nameof(name));
if (table == null) throw new ArgumentNullException(nameof(table));
if (fields == null) throw new ArgumentNullException(nameof(fields));
Name = name;
Table = table;
Fields = fields;
}
/// <summary></summary>
public override string ToString()
{
var fields = Fields.FindAll(x => x != null && x.Column != null);
if (fields.IsEmpty()) return Name;
var array = fields.Map(x => x.Order == FieldOrder.Ascend ? x.Column.Field : $"{x.Column.Field} DESC");
return $"{Name} ({array.Join(", ")})";
}
}
}