PersistentVariableManager.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.Transactions;
using Deveel.Data.Types;

namespace Deveel.Data.Sql.Variables {
    public sealed class PersistentVariableManager : IVariableManager, IObjectManager {
        public PersistentVariableManager(ITransaction transaction) {
            Transaction = transaction;
        }

        public ITransaction Transaction { get; private set; }


        DbObjectType IObjectManager.ObjectType {
            get { return DbObjectType.Variable; }
        }

        void IObjectManager.Create() {
            //TODO:
        }

        void IObjectManager.CreateObject(IObjectInfo objInfo) {
            var variableInfo = objInfo as VariableInfo;
            if (variableInfo == null)
                throw new ArgumentException();

            DefineVariable(variableInfo);
        }

        bool IObjectManager.RealObjectExists(ObjectName objName) {
            return (this as IObjectManager).ObjectExists(objName);
        }

        bool IObjectManager.ObjectExists(ObjectName objName) {
            if (objName == null)
                throw new ArgumentNullException("objName");

            if (objName.Parent != null)
                throw new ArgumentException();

            return VariableExists(objName.Name);
        }

        public Variable DefineVariable(VariableInfo variableInfo) {
            throw new NotImplementedException();
        }

        public bool VariableExists(string name) {
            return VariableExists(name, Transaction.IgnoreIdentifiersCase());
        }

        public bool DropVariable(string variableName) {
            throw new NotImplementedException();
        }

        public Variable GetVariable(string variableName) {
            throw new NotImplementedException();
        }

        IDbObject IObjectManager.GetObject(ObjectName objName) {
            if (objName == null)
                throw new ArgumentNullException("objName");

            if (objName.Parent != null)
                throw new ArgumentException();

            return GetVariable(objName.Name);
        }

        bool IObjectManager.AlterObject(IObjectInfo objInfo) {
            throw new NotSupportedException();
        }

        bool IObjectManager.DropObject(ObjectName objName) {
            if (objName == null)
                throw new ArgumentNullException("objName");

            if (objName.Parent != null)
                throw new ArgumentException();

            return DropVariable(objName.Name);
        }

        ObjectName IObjectManager.ResolveName(ObjectName objName, bool ignoreCase) {
            if (objName.Parent != null)
                return null;

            if (VariableExists(objName.Name, ignoreCase))
                return new ObjectName(objName.Name);

            return null;
        }

        private bool VariableExists(string name, bool ignoreCase) {
            throw new NotImplementedException();
        }

        DataObject IVariableResolver.Resolve(ObjectName variable) {
            if (!VariableExists(variable.Name))
                return null;

            throw new NotImplementedException();
        }

        SqlType IVariableResolver.ReturnType(ObjectName variable) {
            if (!VariableExists(variable.Name))
                return null;

            throw new NotImplementedException();
        }

        public void Dispose() {
            Transaction = null;
        }
    }
}