//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
 
namespace System.ServiceModel.Description
{
    using System.Xml;
    using System.ServiceModel.Channels;
    using System.Collections;
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
 
    public abstract class PolicyConversionContext
    {
        readonly ContractDescription contract;
 
        protected PolicyConversionContext(ServiceEndpoint endpoint)
        {
            if (endpoint == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("endpoint");
            this.contract = endpoint.Contract;
        }
 
        public abstract BindingElementCollection BindingElements { get; }
        
        internal virtual BindingParameterCollection BindingParameters 
        {
            get
            {
                return null;
            }
        }
 
        public ContractDescription Contract { get { return this.contract; } }
 
        public abstract PolicyAssertionCollection GetBindingAssertions();
        public abstract PolicyAssertionCollection GetOperationBindingAssertions(OperationDescription operation);
        public abstract PolicyAssertionCollection GetMessageBindingAssertions(MessageDescription message);
        public abstract PolicyAssertionCollection GetFaultBindingAssertions(FaultDescription fault);
 
        internal static XmlElement FindAssertion(ICollection<XmlElement> assertions, string localName, string namespaceUri, bool remove)
        {
            XmlElement result = null;
            foreach (XmlElement assertion in assertions)
            {
                if ((assertion.LocalName == localName) &&
                    ((namespaceUri == null) || (assertion.NamespaceURI == namespaceUri)))
                {
                    result = assertion;
                    if (remove)
                        assertions.Remove(result);
                    break;
                }
            }
            return result;
        }
 
    }
 
}