DataTypeBuilder.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.Types;

namespace Deveel.Data.Sql.Parser {
    static class DataTypeBuilder {
        public static SqlType Build(ITypeResolver resolver, ISqlNode sqlNode) {
            var node = sqlNode as DataTypeNode;
            if (node == null)
                throw new ArgumentException();

            var typeName = node.TypeName;
            var typeMeta = new List<DataTypeMeta>();
            SqlTypeCode sqlTypeCode;

            if (node.IsPrimitive) {
                if (String.Equals(typeName, "LONG VARCHAR")) {
                    sqlTypeCode = SqlTypeCode.LongVarChar;
                } else if (String.Equals(node.TypeName, "LONG VARBINARY")) {
                    sqlTypeCode = SqlTypeCode.LongVarBinary;
                } else if (String.Equals(typeName, "INT", StringComparison.OrdinalIgnoreCase)) {
                    sqlTypeCode = SqlTypeCode.Integer;
                } else {
                    try {
                        sqlTypeCode = (SqlTypeCode) Enum.Parse(typeof (SqlTypeCode), node.TypeName, true);
                    } catch (Exception) {
                        sqlTypeCode = SqlTypeCode.Unknown;
                    }
                }
                 
                if (sqlTypeCode == SqlTypeCode.Float ||
                    sqlTypeCode == SqlTypeCode.Real ||
                    sqlTypeCode == SqlTypeCode.Double ||
                    sqlTypeCode == SqlTypeCode.Decimal ||
                    sqlTypeCode == SqlTypeCode.Numeric) {
                    if (node.HasScale)
                        typeMeta.Add(new DataTypeMeta("Scale", node.Scale.ToString()));
                    if (node.HasPrecision)
                        typeMeta.Add(new DataTypeMeta("Precision", node.Precision.ToString()));
                } else if (sqlTypeCode == SqlTypeCode.Char ||
                           sqlTypeCode == SqlTypeCode.VarChar ||
                           sqlTypeCode == SqlTypeCode.LongVarChar) {
                    if (node.HasSize)
                        typeMeta.Add(new DataTypeMeta("MaxSize", node.Size.ToString()));
                    if (node.HasLocale)
                        typeMeta.Add(new DataTypeMeta("Locale", node.Locale));
                    if (node.HasEncoding)
                        typeMeta.Add(new DataTypeMeta("Encoding", node.Encoding));
                } else if (sqlTypeCode == SqlTypeCode.Binary ||
                           sqlTypeCode == SqlTypeCode.VarBinary ||
                           sqlTypeCode == SqlTypeCode.LongVarBinary) {
                    if (node.HasSize)
                        typeMeta.Add(new DataTypeMeta("MaxSize", node.Size.ToString()));
                }

                // TODO: Support %ROWTYPE and %TYPE
            } else {
                sqlTypeCode = SqlTypeCode.Type;
            }

            if (String.IsNullOrEmpty(typeName))
                throw new SqlParseException("Could not determine type name.");

            DataTypeMeta[] meta = typeMeta.ToArray();
            if (!node.IsPrimitive && node.Metadata != null)
                meta = BuildTypeMeta(node.Metadata);

            var type = TypeResolver.Resolve(sqlTypeCode, typeName, meta, resolver);

            if (type == null)
                throw new SqlParseException(String.Format("User defined type {0} could not be resolved.", typeName));

            return type;
        }

        private static DataTypeMeta[] BuildTypeMeta(Dictionary<string, string> metadata) {
            return metadata.Select(x => new DataTypeMeta(x.Key, x.Value)).ToArray();
        }
    }
}