ColumnConstraintNode.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;

namespace Deveel.Data.Sql.Parser {
    class ColumnConstraintNode : SqlNode {
        private bool notSeen;

        internal ColumnConstraintNode() {
        }

        public string ConstraintType { get; private set; }

        public IExpressionNode CheckExpression { get; private set; }

        public ObjectNameNode ReferencedTable { get; private set; }

        public IdentifierNode ReferencedColumn { get; private set; }

        public string OnDeleteAction { get; private set; }

        public string OnUpdateAction { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node is SqlKeyNode) {
                var keyNode = (SqlKeyNode) node;
                if (String.Equals(keyNode.Text, "NULL", StringComparison.OrdinalIgnoreCase)) {
                    if (notSeen) {
                        ConstraintType = ConstraintTypeNames.NotNull;
                    } else {
                        ConstraintType = ConstraintTypeNames.Null;
                    }
                } else if (String.Equals(keyNode.Text, "NOT", StringComparison.OrdinalIgnoreCase)) {
                    notSeen = true;
                } else if (String.Equals(keyNode.Text, "REFERENCES", StringComparison.OrdinalIgnoreCase)) {
                    ConstraintType = ConstraintTypeNames.ForeignKey;
                } else if (String.Equals(keyNode.Text, "CHECK", StringComparison.OrdinalIgnoreCase)) {
                    ConstraintType = ConstraintTypeNames.Check;
                } else if (String.Equals(keyNode.Text, "PRIMARY", StringComparison.OrdinalIgnoreCase)) {
                    ConstraintType = ConstraintTypeNames.PrimaryKey;
                } else if (String.Equals(keyNode.Text, "UNIQUE", StringComparison.OrdinalIgnoreCase)) {
                    ConstraintType = ConstraintTypeNames.UniqueKey;
                }
            } else if (node is IExpressionNode) {
                CheckExpression = (IExpressionNode) node;
            } else if (node is ObjectNameNode) {
                if (!String.Equals(ConstraintType, ConstraintTypeNames.ForeignKey, StringComparison.OrdinalIgnoreCase))
                    throw new InvalidOperationException();

                ReferencedTable = ((ObjectNameNode) node);
            }

            return base.OnChildNode(node);
        }
    }
}