QueryExtensions.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.Objects;
using Deveel.Data.Transactions;

namespace Deveel.Data.Sql.Sequences {
    public static class QueryExtensions {
        public static ISequence GetSequence(this IQuery context, ObjectName sequenceName) {
            return context.GetObject(DbObjectType.Sequence, sequenceName, AccessType.Read) as ISequence;
        }

        public static SqlNumber GetNextValue(this IQuery context, ObjectName sequenceName) {
            var sequence = context.GetSequence(sequenceName);
            if (sequence == null)
                throw new InvalidOperationException(String.Format("Sequence {0} was not found.", sequenceName));

            return sequence.NextValue();
        }

        public static SqlNumber GetCurrentValue(this IQuery context, ObjectName sequenceName) {
            var sequence = context.GetSequence(sequenceName);
            if (sequence == null)
                throw new InvalidOperationException(String.Format("Sequence {0} was not found.", sequenceName));

            return sequence.GetCurrentValue();
        }

        public static void SetCurrentValue(this IQuery context, ObjectName sequenceName, SqlNumber value) {
            var sequence = context.GetSequence(sequenceName);
            if (sequence == null)
                throw new InvalidOperationException(String.Format("Sequence {0} was not found.", sequenceName));

            sequence.SetValue(value);
        }
    }
}