PrivilegeNode.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.Generic;
using System.Linq;

namespace Deveel.Data.Sql.Parser {
    class PrivilegeNode : SqlNode {
        static PrivilegeNode() {
            All = new PrivilegeNode {Privilege = "ALL"};
        }

        public string Privilege { get; private set; }

        public IEnumerable<string> Columns { get; private set; }

        public static PrivilegeNode All { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node is SqlKeyNode) {
                Privilege = ((SqlKeyNode) node).Text;
            } else if (node.NodeName.Equals("update_priv")) {
                Privilege = "UPDATE";
                GetPrivilegeWithColumns(node);
            } else if (node.NodeName.Equals("select_priv")) {
                Privilege = "SELECT";
                GetPrivilegeWithColumns(node);
            } else if (node.NodeName.Equals("reference_priv")) {
                Privilege = "REFERENCE";
                GetPrivilegeWithColumns(node);
            }

            return base.OnChildNode(node);
        }

        private void GetPrivilegeWithColumns(ISqlNode node) {
            foreach (var childNode in node.ChildNodes) {
                if (childNode.NodeName.Equals("column_list_opt"))
                    GetColumns(childNode);
            }
        }

        private void GetColumns(ISqlNode node) {
            var childNode = node.ChildNodes.FirstOrDefault();
            if (childNode == null)
                return;

            var list = new List<string>();
            foreach (var idNode in childNode.ChildNodes) {
                if (idNode is IdentifierNode)
                    list.Add(((IdentifierNode)idNode).Text);
            }

            Columns = list.AsEnumerable();
        }
    }
}