QueryContextExtensions.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.Expressions;
using Deveel.Data.Types;

namespace Deveel.Data.Sql.Variables {
    public static class QueryContextExtensions {
        //public static void DeclareConstantVariable(this IQueryContext context, string name, SqlType type, SqlExpression defaultExpression) {
        //  if (defaultExpression == null)
        //      throw new ArgumentNullException("defaultExpression");
        //  if (type == null)
        //      throw new ArgumentNullException("type");

        //  // TODO: Create a variable resolver for the query context scope
        //  var expType = defaultExpression.ReturnType(context,  null);
        //  if (!type.IsComparable(expType))
        //      throw new ArgumentException();

        //  var info = new VariableInfo(name, type, true);
        //  info.DefaultExpression = defaultExpression;
        //  info.IsNotNull = true;

        //  context.DeclareVariable(info);
        //}

        //public static Variable FindVariable(this IQueryContext context, string name) {
        //  var variable = context.VariableManager.GetVariable(name);
        //  if (variable == null &&
        //      context.ParentContext != null)
        //      variable = context.ParentContext.FindVariable(name);

        //  return variable;
        //}

        //public static void SetVariable(this IQueryContext context, string name, SqlExpression expression) {
        //  var variable = context.FindVariable(name);
        //  if (variable == null && expression != null) {
        //      // TODO: Create a variable resolver for the query context scope
        //      var varType = expression.ReturnType(context, null);
        //      variable = context.DeclareVariable(name, varType);
        //  }

        //  if (variable == null)
        //      throw new ObjectNotFoundException(new ObjectName(name));

        //  variable.SetValue(context, expression);
        //}
    }
}