Innovenergy_trunk/csharp/Lib/Protocols/DBus/Daemon/MatchRule.cs

using System.Text;
using InnovEnergy.Lib.Protocols.DBus.Protocol.DataTypes;
using InnovEnergy.Lib.Protocols.DBus.Protocol.Header;
using static InnovEnergy.Lib.Protocols.DBus.Protocol.Header.MessageType;

namespace InnovEnergy.Lib.Protocols.DBus.Daemon;

public interface IMatchRule
{
    MessageType? Type          { get; }
    String?      Interface     { get; }
    String?      Member        { get; }
    ObjectPath?  Path          { get; }
    ObjectPath?  PathNamespace { get; }
    String?      Sender        { get; }
    String?      Destination   { get; }
    Boolean      Eavesdrop     { get; }

    // TODO: argN, argNpath, arg0namespace
}

public record MatchRule : IMatchRule
{
    public MessageType?  Type          { get; init; } 
    public String?       Interface     { get; init; } 
    public String?       Member        { get; init; } 
    public ObjectPath?   Path          { get; init; } 
    public ObjectPath?   PathNamespace { get; init; } 
    public String?       Sender        { get; init; } 
    public String?       Destination   { get; init; } 
    public Boolean       Eavesdrop     { get; init; } = false;

    public override String ToString() => this.Rule();
}


public record SignalMatchRule : IMatchRule
{
    public MessageType?  Type          => Signal;
    public String?       Interface     { get; init; }
    public String?       Member        { get; init; }
    public ObjectPath?   Path          { get; init; }
    public ObjectPath?   PathNamespace { get; init; }
    public String?       Sender        { get; init; }
    public String?       Destination   => null;
    public Boolean       Eavesdrop     => false;

    public override String ToString() => this.Rule();
}

// public record MethodCallMatchRule : IMatchRule
// {
//     public MessageType?  Type          => MethodCall;
//     public String?       Interface     { get; init; } = null;
//     public String?       Member        { get; init; } = null;
//     public ObjectPath?   Path          { get; init; } = null;
//     public ObjectPath?   PathNamespace { get; init; } = null;
//     public String?       Destination   => null;
//     public String?       Sender        => null;
//     public Boolean       Eavesdrop     => false;
// }
//
// public record MethodReturnMatchRule : IMatchRule
// {
//     public MessageType?  Type          => MethodReturn;
//     public String?       Interface     { get; init; } = null;
//     public String?       Member        { get; init; } = null;
//     public ObjectPath?   Path          { get; init; } = null;
//     public ObjectPath?   PathNamespace => null;
//     public String?       Destination   => null;
//     public String?       Sender        => null;
//     public Boolean       Eavesdrop     => false;
// }


internal static class MatchRuleExtensions
{
    public static String Rule(this IMatchRule rule)
    {
        var sb = new StringBuilder();

        Append("type"          , MessageType(rule.Type));
        Append("interface"     , rule.Interface);
        Append("member"        , rule.Member);
        Append("path"          , rule.Path?.Path);
        Append("sender"        , rule.Sender);
        Append("destination"   , rule.Destination);
        Append("path_namespace", rule.PathNamespace?.Path);
        Append("eavesdrop"     , rule.Eavesdrop ? "true" : null);

        return sb.ToString();

        void Append(String key, Object? value)
        {
            if (value is null) return;

            if (sb.Length != 0)
                sb.Append(',');

            sb.Append(key);
            sb.Append("='");
            sb.Append(value.ToString()?.Replace(@"\", @"\\").Replace(@"'", @"\'"));
            sb.Append('\'');
        }

        String? MessageType(MessageType? messageType) => messageType switch
        {
            Signal       => "signal",
            MethodCall   => "method_call",
            MethodReturn => "method_return",
            Error        => "error",
            null         => null,
            _            => throw new ArgumentOutOfRangeException(nameof(messageType), messageType, null)
        };
    }
}