// $Id$
// 
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
// 
using System;
using Org.Apache.Etch.Bindings.Csharp.Msg;

namespace Org.Apache.Etch.Bindings.Csharp.Transport.Fmt.Binary
{
    /// <summary>
    /// A validator for the special end of list marker,
    /// </summary>
    public class Validator_none : Validator
    {
        public static Validator_none Get()
        {
            if ( validator == null )
                validator = new Validator_none();
            return validator;
        }

        private static Validator_none validator;

        /// <summary>
        /// constructs the validator
        /// </summary>
        public Validator_none()
        {
            //nothing to do
        }

        public override Validator ElementValidator()
        {
        
            throw new ArgumentException("not an array");
        }

        public override bool Validate( Object value )
        {
            return value == BinaryTaggedData.NONE;
        }

      

        public override object ValidateValue(object value)
        {
            if (Validate(value))
                return value;

            throw new Exception("value not appropriate for none: " + value);
        }
    }
}