[OperationContract] Methods in WCF REST Service

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C#

WCF

In my [OperationContract] attribute I have written three methods like:

[OperationContract(Name="RolebyName")]
        [WebInvoke(UriTemplate = "Role/{name}", Method = "GET", RequestFormat =WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json,BodyStyle = WebMessageBodyStyle.Bare)]
    Role1 GetRole(string name);
        [OperationContract(Name="RolebyProviderId")]
        [WebInvoke(UriTemplate = "Rolebypid/?pid={providerId}", Method = "GET", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
     Role1 GetRolebyId(Guid providerId);
        [OperationContract(Name="RolebyCompanyProviderId")]
        [WebInvoke(UriTemplate = "RolebyCPid/?companyId={companyId}&providerId={providerId}", Method = "GET", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
        Role1 GetRolebyCPId(Guid companyId, Guid providerId);

I am implementing these three methods separately in Service.cs class

My question is... Instead of implementing as three methods separately can I implement a single class and implemnt the methods inside it ?

If so how can I declare the class in [OperationContract] and also implement it in Service.cs;Based on the parameter passed it has to call that particular method ?