GrantRoleStatementNode.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;

using Deveel.Data.Sql.Statements;

namespace Deveel.Data.Sql.Parser {
    class GrantRoleStatementNode : SqlStatementNode {
        public IEnumerable<string> Grantees { get; private set; }

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

        public bool WithAdmin { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node.NodeName.Equals("role_list")) {
                GetRoleList(node);
            } else if (node.NodeName.Equals("distribution_list")) {
                GetGrantees(node);
            } else if (node.NodeName.Equals("with_admin_opt")) {
                GetWithAdmin(node);
            }

            return base.OnChildNode(node);
        }

        private void GetGrantees(ISqlNode node) {
            Grantees = node.ChildNodes.OfType<IdentifierNode>().Select(x => x.Text);
        }

        private void GetRoleList(ISqlNode node) {
            Roles = node.ChildNodes.OfType<IdentifierNode>().Select(x => x.Text);
        }

        private void GetWithAdmin(ISqlNode node) {
            if (node.ChildNodes.Any())
                WithAdmin = true;
        }

        protected override void BuildStatement(StatementBuilder builder) {
            foreach (var grantee in Grantees) {
                foreach (var role in Roles) {
                    builder.Statements.Add(new GrantRoleStatement(grantee, role, WithAdmin));
                }
            }
        }
    }
}