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using System.Collections.Generic;

using Npgsql.Internal.Postgres;

namespace Npgsql.PostgresTypes;

/// <summary>

/// Represents a PostgreSQL composite data type, which can hold multiple fields of varying types in a single column.

/// </summary>

/// <remarks>

/// See https://www.postgresql.org/docs/current/static/rowtypes.html.

/// </remarks>

public class PostgresCompositeType : PostgresType

{

/// <summary>

/// Holds the name and types for all fields.

/// </summary>

public IReadOnlyList<Field> Fields => MutableFields;

internal List<Field> MutableFields { get; } = [];

/// <summary>

/// Constructs a representation of a PostgreSQL array data type.

/// </summary>

internal PostgresCompositeType(string ns, string name, uint oid)

: base(ns, name, oid) {}

/// <summary>

/// Constructs a representation of a PostgreSQL domain data type.

/// </summary>

internal PostgresCompositeType(DataTypeName dataTypeName, Oid oid)

: base(dataTypeName, oid) {}

/// <summary>

/// Represents a field in a PostgreSQL composite data type.

/// </summary>

public class Field

{

internal Field(string name, PostgresType type)

{

Name = name;

Type = type;

}

/// <summary>

/// The name of the composite field.

/// </summary>

public string Name { get; }

/// <summary>

/// The type of the composite field.

/// </summary>

public PostgresType Type { get; }

/// <inheritdoc />

public override string ToString() => $"{Name} => {Type}";

}

}