CellKey.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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 System;

using Deveel.Data.Sql;
using Deveel.Data.Sql.Tables;

namespace Deveel.Data.Caching {
    public sealed class CellKey : IEquatable<CellKey> {
        private readonly string database;
        private readonly CellId cellId;

        internal CellKey(string database, CellId cellId) {
            if (String.IsNullOrEmpty(database))
                throw new ArgumentNullException("database");

            if (cellId.RowId.IsNull)
                throw new ArgumentException("Null ROWID in key.","cellId");
            if (cellId.ColumnOffset < 0)
                throw new ArgumentOutOfRangeException("cellId", "The column offset in the key is smaller than zero.");

            this.database = database;
            this.cellId = cellId;
        }

        public string Database {
            get { return database; }
        }

        public RowId RowId {
            get { return cellId.RowId; }
        }

        public int ColumnOffset {
            get { return cellId.ColumnOffset; }
        }

        public bool Equals(CellKey other) {
            if (other == null)
                return false;

            return String.Equals(database, other.database) &&
                   cellId.Equals(other.cellId);
        }

        public override bool Equals(object obj) {
            var other = obj as CellKey;
            return Equals(other);
        }

        public override int GetHashCode() {
            unchecked {
                return ((database != null ? database.GetHashCode() : 0)*397) ^ cellId.GetHashCode();
            }
        }
    }
}