ExceptionHandlerNode.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 ExceptionHandlerNode : SqlNode {
        public bool HandlesOthers { get; private set; }

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

        public IEnumerable<IStatementNode> Statements { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node.NodeName.Equals("handled_exceptions")) {
                GetHandledExceptions(node);
            } else if (node.NodeName.Equals("plsql_statement_list")) {
                GetStatements(node);
            }

            return base.OnChildNode(node);
        }

        private void GetStatements(ISqlNode node) {
            var statements = new List<IStatementNode>();
            foreach (var childNode in node.ChildNodes) {
                if (childNode.NodeName.Equals("plsql_statement")) {
                    statements.AddRange(childNode.ChildNodes.OfType<IStatementNode>());
                }
            }

            Statements = statements.ToArray();
        }

        private void GetHandledExceptions(ISqlNode node) {
            var exceptionNames = new List<string>();

            foreach (var childNode in node.ChildNodes) {
                if (HandlesOthers)
                    throw new SqlParseException("Multiple exception names found when OTHERS clause was specified.");

                if (childNode is SqlKeyNode &&
                    ((SqlKeyNode) childNode).Text.Equals("OTHERS", StringComparison.OrdinalIgnoreCase)) {
                    HandlesOthers = true;
                } else if (childNode is IdentifierNode) {
                    exceptionNames.Add(((IdentifierNode)childNode).Text);
                }
            }

            if (!HandlesOthers)
                HandledExceptionNames = exceptionNames.ToArray();
        }
    }
}