VariableScopeExtensions.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 VariableScopeExtensions {
        public static bool HasVariable(this IVariableScope scope, string variableName) {
            return scope.VariableManager.VariableExists(variableName);
        }

        public static Variable DefineVariable(this IVariableScope scope, VariableInfo variableInfo) {
            return scope.VariableManager.DefineVariable(variableInfo);
        }

        public static Variable DefineVariable(this IVariableScope scope, string variableName, SqlType variableType) {
            return DefineVariable(scope, variableName, variableType, false);
        }

        public static Variable DefineVariable(this IVariableScope scope, string variableName, SqlType variableType, bool constant) {
            return scope.DefineVariable(new VariableInfo(variableName, variableType, constant));
        }

        public static bool DropVariable(this IVariableScope scope, string variableName) {
            return scope.VariableManager.DropVariable(variableName);
        }

        public static Variable GetVariable(this IVariableScope scope, string variableName) {
            return scope.VariableManager.GetVariable(variableName);
        }

        public static Variable SetVariable(this IVariableScope scope, string variableName, DataObject value) {
            var variable = scope.GetVariable(variableName);
            if (variable == null)
                variable = scope.DefineVariable(variableName, value.Type);

            variable.SetValue(value);
            return variable;
        }

        public static void SetBooleanVariable(this IVariableScope transaction, string name, bool value) {
            transaction.SetVariable(name, DataObject.Boolean(value));
        }

        public static void SetStringVariable(this IVariableScope transaction, string name, string value) {
            transaction.SetVariable(name, DataObject.String(value));
        }

        public static bool GetBooleanVariable(this IVariableScope transaction, string name) {
            var variable = transaction.GetVariable(name);
            if (variable == null)
                return false;

            return variable.Value.AsBoolean();
        }

        public static string GetStringVariable(this IVariableScope transaction, string name) {
            var variable = transaction.GetVariable(name);
            if (variable == null)
                return null;

            return variable.Value;
        }
    }
}