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using Npgsql;

namespace NpgsqlRest

{

public interface IRoutineSourceParameterFormatter

{

/// <summary>

/// Return true to call FormatCommand

/// Return false to call AppendCommandParameter or AppendEmpty (when no parameters are present).

/// </summary>

bool IsFormattable { get; }

/// <summary>

/// Return true to call format methods with HttpContext reference.

/// Return false to call format methods without HttpContext reference.

/// </summary>

bool RefContext { get => false; }

/// <summary>

/// Appends result to the command expression string.

/// </summary>

/// <param name="parameter">NpgsqlRestParameter extended parameter with actual name and type descriptor</param>

/// <param name="index">index of the current parameter</param>

/// <returns>string to append to expression or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? AppendCommandParameter(NpgsqlRestParameter parameter, int index) => null;

/// <summary>

/// Formats the command expression string.

/// </summary>

/// <param name="routine">Current routine data</param>

/// <param name="parameters">Extended parameters list.</param>

/// <returns>expression string or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? FormatCommand(Routine routine, NpgsqlParameterCollection parameters) => null;

/// <summary>

/// Called when there are no parameters to append.

/// </summary>

/// <returns>string to append to expression or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? AppendEmpty() => null;

/// <summary>

/// Appends result to the command expression string.

/// </summary>

/// <param name="parameter">NpgsqlRestParameter extended parameter with actual name and type descriptor</param>

/// <param name="index">index of the current parameter</param>

/// <param name="context">HTTP context reference</param>

/// <returns>string to append to expression or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? AppendCommandParameter(NpgsqlRestParameter parameter, int index, HttpContext context) => null;

/// <summary>

/// Formats the command expression string.

/// </summary>

/// <param name="routine">Current routine data</param>

/// <param name="parameters">Extended parameters list.</param>

/// <param name="context">HTTP context reference</param>

/// <returns>expression string or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? FormatCommand(Routine routine, NpgsqlParameterCollection parameters, HttpContext context) => null;

/// <summary>

/// Called when there are no parameters to append.

/// </summary>

/// <param name="context">HTTP context reference</param>

/// <returns>string to append to expression or null to skip (404 if endpoint is not handled in the next handler)</returns>

string? AppendEmpty(HttpContext context) => null;

}

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