SqlTabular.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 System.Collections;
using System.Collections.Generic;

using Deveel.Data;
using Deveel.Data.Index;

namespace Deveel.Data.Sql.Objects {
    public sealed class SqlTabular : ITable, ISqlObject {
        private ITable table;

        private SqlTabular(ITable table) {
            this.table = table;
        }

        int IComparable.CompareTo(object obj) {
            throw new NotSupportedException();
        }

        int IComparable<ISqlObject>.CompareTo(ISqlObject other) {
            throw new NotSupportedException();
        }

        public bool IsNull {
            get { return table == null; }
        }

        private void AssertNotNull() {
            if (table == null)
                throw new NullReferenceException("The object is null.");
        }

        bool ISqlObject.IsComparableTo(ISqlObject other) {
            return false;
        }

        public static SqlTabular From(ITable table) {
            return new SqlTabular(table);
        }

        ObjectName IDbObject.FullName {
            get {
                AssertNotNull();
                return table.FullName;
            }
        }

        DbObjectType IDbObject.ObjectType {
            get { return DbObjectType.Table; }
        }

        public IEnumerator<Row> GetEnumerator() {
            AssertNotNull();
            return table.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator();
        }

        public void Dispose() {
            table = null;
        }

        IDatabaseContext ITable.DatabaseContext {
            get {
                AssertNotNull();
                return table.DatabaseContext;
            }
        }

        TableInfo ITable.TableInfo {
            get {
                AssertNotNull();
                return table.TableInfo;
            }
        }

        public int RowCount {
            get {
                AssertNotNull();
                return table.RowCount;
            }
        }

        public DataObject GetValue(long rowNumber, int columnOffset) {
            AssertNotNull();
            return table.GetValue(rowNumber, columnOffset);
        }

        ColumnIndex ITable.GetIndex(int columnOffset) {
            AssertNotNull();
            return table.GetIndex(columnOffset);
        }
    }
}