/*----------------------------------------------------------------------------------

// Copyright 2019 Huawei Technologies Co.,Ltd.

// Licensed 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 OBS.Internal;

using System;

using System.Collections.Generic;



namespace OBS.Model

{

    /// <summary>

    /// Customized metadata information

    /// </summary>

    public sealed class MetadataCollection

    {

        

        private IDictionary<string, string> values = new Dictionary<string, string>();



        /// <summary>

        /// Customized metadata

        /// </summary>

        /// <param name="name">Metadata element name</param>

        /// <returns>Metadata element value</returns>

        public string this[string name]

        {

            get

            {

                string value;

                if (values.TryGetValue(name, out value))

                {

                    return value;

                }



                return null;

            }

            set

            {

                values[name] = value;

            }

        }



        /// <summary>

        /// Add customized metadata.

        /// </summary>

        /// <param name="name">Metadata element name</param>

        /// <param name="value">Metadata element value</param>

        public void Add(string name, string value)

        {

            this[name] = value;

        }



        /// <summary>

        /// Number of corresponding metadata headers

        /// </summary>

        public int Count

        {

            get { return this.values.Count; }

        }



        /// <summary>

        /// Set of metadata element names

        /// </summary>

        public ICollection<string> Keys

        {

            get { return values.Keys; }

        }



        /// <summary>

        /// Set of metadata element values

        /// </summary>

        public ICollection<string> Values

        {

            get { return values.Values; }

        }



        /// <summary>

        /// Metadata key-value pairs

        /// </summary>

        public IList<KeyValuePair<string, string>> KeyValuePairs

        {

            get { return new List<KeyValuePair<string, string>>(this.values); }

        }

    }

}