OpenCursorStatementNode.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.Index;
using Deveel.Data.Sql.Expressions;
using Deveel.Data.Sql.Statements;

namespace Deveel.Data.Sql.Parser {
    class OpenCursorStatementNode : SqlStatementNode {
        public string CursorName { get; private set; }

        public IEnumerable<IExpressionNode> Arguments { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node is IdentifierNode) {
                CursorName = ((IdentifierNode) node).Text;
            } else if (node.NodeName.Equals("args_opt")) {
                GetArguments(node);
            }

            return base.OnChildNode(node);
        }

        private void GetArguments(ISqlNode node) {
            var listNode = node.FindByName("arg_list");
            if (listNode == null)
                return;

            var args = new List<IExpressionNode>();

            foreach (var childNode in listNode.ChildNodes) {
                if (childNode is IExpressionNode)
                    args.Add((IExpressionNode)childNode);
            }

            Arguments = args.AsEnumerable();
        }

        protected override void BuildStatement(StatementBuilder builder) {
            var args = new List<SqlExpression>();
            if (Arguments != null) {
                args = Arguments.Select(ExpressionBuilder.Build).ToList();
            }

            builder.Statements.Add(new OpenStatement(CursorName, args.ToArray()));
        }
    }
}