CreateTableStatement.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.Security;
using Deveel.Data.Serialization;
using Deveel.Data.Sql.Tables;

namespace Deveel.Data.Sql.Statements {
    public sealed class CreateTableStatement : SqlStatement, IPreparableStatement {
        public CreateTableStatement(string tableName, IEnumerable<SqlTableColumn> columns) {
            TableName = tableName;
            Columns = new List<SqlTableColumn>();
            if (columns != null) {
                foreach (var column in columns) {
                    Columns.Add(column);
                }
            }
        }

        public string TableName { get; private set; }

        public IList<SqlTableColumn> Columns { get; private set; }

        public bool IfNotExists { get; set; }

        public bool Temporary { get; set; }

        IStatement IPreparableStatement.Prepare(IRequest context) {
            var tableInfo = CreateTableInfo(context);

            return new Prepared(tableInfo, IfNotExists, Temporary);
        }

        private TableInfo CreateTableInfo(IRequest context) {
            var tableName = context.Query.ResolveTableName(TableName);

            var idColumnCount = Columns.Count(x => x.IsIdentity);
            if (idColumnCount > 1)
                throw new InvalidOperationException("More than one IDENTITY column specified.");

            bool ignoreCase = context.Query.IgnoreIdentifiersCase();
            var columnChecker = new TableColumnChecker(Columns, ignoreCase);


            var tableInfo = new TableInfo(tableName);

            foreach (var column in Columns) {
                var columnInfo = CreateColumnInfo(tableName.Name, column, columnChecker);
                tableInfo.AddColumn(columnInfo);
            }

            return tableInfo;
        }

        private ColumnInfo CreateColumnInfo(string tableName, SqlTableColumn column, TableColumnChecker columnChecker) {
            var expression = column.DefaultExpression;

            if (column.IsIdentity && expression != null)
                throw new InvalidOperationException(String.Format("Identity column '{0}' cannot define a DEFAULT expression.", column.ColumnName));

            if (expression != null)
                expression = columnChecker.CheckExpression(expression);


            var columnName = columnChecker.StripTableName(tableName, column.ColumnName);

            return new ColumnInfo(columnName, column.ColumnType) {
                DefaultExpression = expression,
                IsNotNull = column.IsNotNull
            };
        }

        #region Prepared

        [Serializable]
        internal class Prepared : SqlStatement {
            private Prepared(ObjectData data) {
                TableInfo = data.GetValue<TableInfo>("TableInfo");
                Temporary = data.GetBoolean("Temporary");
                IfNotExists = data.GetBoolean("IfNotExists");
            }

            public TableInfo TableInfo { get; private set; }

            public bool Temporary { get; private set; }

            public bool IfNotExists { get; private set; }

            internal Prepared(TableInfo tableInfo, bool ifNotExists, bool temporary) {
                TableInfo = tableInfo;
                IfNotExists = ifNotExists;
                Temporary = temporary;
            }

            protected override void ExecuteStatement(ExecutionContext context) {
                try {
                    context.Request.Query.CreateTable(TableInfo, IfNotExists, Temporary);
                } catch (SecurityException ex) {
                    throw new StatementException(String.Format("A security error occurred while creating the table '{0}'.", TableInfo.TableName), ex);
                }
            }

            protected override void GetData(SerializeData data) {
                data.SetValue("TableInfo", typeof(TableInfo), TableInfo);
                data.SetValue("Temporary", Temporary);
                data.SetValue("IfNotExists", IfNotExists);
            }
        }

        #endregion

        #region TableColumnChecker

        class TableColumnChecker : ColumnChecker {
            private readonly IEnumerable<SqlTableColumn> columns;
            private readonly bool ignoreCase;

            public TableColumnChecker(IEnumerable<SqlTableColumn> columns, bool ignoreCase) {
                this.columns = columns;
                this.ignoreCase = ignoreCase;
            }

            public override string ResolveColumnName(string columnName) {
                var comparison = ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal;
                string foundColumn = null;

                foreach (var columnInfo in columns) {
                    if (foundColumn != null)
                        throw new InvalidOperationException(String.Format("Column name '{0}' caused an ambiguous match in table.", columnName));

                    if (String.Equals(columnInfo.ColumnName, columnName, comparison))
                        foundColumn = columnInfo.ColumnName;
                }

                return foundColumn;
            }
        }

        #endregion

        #region PreparedSerializer

        //internal class PreparedSerializer : ObjectBinarySerializer<Prepared> {
        //  public override void Serialize(Prepared obj, BinaryWriter writer) {
        //      TableInfo.Serialize(obj.TableInfo, writer);
        //      writer.Write(obj.Temporary);
        //      writer.Write(obj.IfNotExists);
        //  }

        //  public override Prepared Deserialize(BinaryReader reader) {
        //      // TODO: Type Resolver!!!
        //      var tableInfo = TableInfo.Deserialize(reader, null);
        //      var temporary = reader.ReadBoolean();
        //      var ifNotExists = reader.ReadBoolean();

        //      return new Prepared(tableInfo, ifNotExists, temporary);
        //  }
        //}

        #endregion
    }
}