StatementBuilder.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;
using Deveel.Data.Sql.Tables;
using Deveel.Data.Types;

namespace Deveel.Data.Sql.Parser {
    public sealed class StatementBuilder : ISqlNodeVisitor {
        public StatementBuilder(ITypeResolver typeResolver) {
            TypeResolver = typeResolver;
            Statements = new List<IStatement>();
        }

        public ITypeResolver  TypeResolver { get; private set; }

        public ICollection<IStatement> Statements { get; private set; } 

        void ISqlNodeVisitor.Visit(ISqlNode node) {
            Visit(node);
        }

        private void Visit(ISqlNode node) {
            if (node is ISqlVisitableNode) {
                (node as ISqlVisitableNode).Accept(this);
                return;
            }

            if (node is SequenceOfStatementsNode)
                VisitSequenceOfStatements((SequenceOfStatementsNode) node);
        }       

        internal SqlType BuildDataType(DataTypeNode node) {
            return DataTypeBuilder.Build(TypeResolver, node);
        }

        private void VisitSequenceOfStatements(SequenceOfStatementsNode node) {
            foreach (var statementNode in node.Statements) {
                Visit(statementNode);
            }
        }

        public IEnumerable<IStatement> Build(ISqlNode rootNode) {
            Visit(rootNode);
            return Statements.ToArray();
        }

        internal static ForeignKeyAction GetForeignKeyAction(string actionName) {
            if (String.Equals("NO ACTION", actionName, StringComparison.OrdinalIgnoreCase) ||
                String.Equals("NOACTION", actionName, StringComparison.OrdinalIgnoreCase))
                return ForeignKeyAction.NoAction;
            if (String.Equals("CASCADE", actionName, StringComparison.OrdinalIgnoreCase))
                return ForeignKeyAction.Cascade;
            if (String.Equals("SET DEFAULT", actionName, StringComparison.OrdinalIgnoreCase) ||
                String.Equals("SETDEFAULT", actionName, StringComparison.OrdinalIgnoreCase))
                return ForeignKeyAction.SetDefault;
            if (String.Equals("SET NULL", actionName, StringComparison.OrdinalIgnoreCase) ||
                String.Equals("SETNULL", actionName, StringComparison.OrdinalIgnoreCase))
                return ForeignKeyAction.SetNull;

            throw new NotSupportedException();
        }
    }
}