File: SchemaLoader.TypeMapping.cs

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#region MIT license
// 
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
#endregion

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
using System.Text.RegularExpressions;

namespace DbLinq.Vendor.Implementation
{
    partial class SchemaLoader
    {
        /// <summary>
        /// This class is used as fallback when no matching type was found.
        /// If we have the case, then something is missing from DbMetal
        /// </summary>
        internal class UnknownType
        {
        }

        /// <summary>
        /// Default IDataType implementation (see IDataType for details)
        /// </summary>
        public class DataType : IDataType
        {
            public virtual string SqlType { get; set; }
            public virtual string ManagedType { get; set; }
            public virtual bool Nullable { get; set; }
            public virtual long? Length { get; set; }
            public virtual int? Precision { get; set; }
            public virtual int? Scale { get; set; }
            public virtual bool? Unsigned { get; set; }
            public string FullType { get; set; }
        }

        protected virtual Type MapDbType(string columnName, IDataType dataType)
        {
            if (dataType == null)
                throw new ArgumentNullException("dataType");
            if (dataType.ManagedType != null)
                return Type.GetType(dataType.ManagedType, true);

            string dataTypeL = dataType.SqlType.ToLowerInvariant();

            if (columnName != null && columnName.ToLower().Contains("guid"))
            {
                bool correctTypeAndLen =
                    ((dataTypeL == "char" || dataTypeL == "varchar") && dataType.Length == 36)
                    || ((dataTypeL == "binary") && dataType.Length == 16);

                if (correctTypeAndLen)
                {
                    Console.WriteLine("experimental support for guid--");
                    return typeof(Guid);
                }
            }

            switch (dataTypeL)
            {
            // string
            case "c":
            case "char":
            case "character":
            case "character varying":
            case "inet":
            case "long":
            case "longtext":
            case "long varchar":
            case "mediumtext":
            case "nchar":
            case "ntext":
            case "nvarchar":
            case "nvarchar2":
            case "string":
            case "text":
            case "varchar":
            case "varchar2":
            case "clob":    // oracle type
            case "nclob":   // oracle type
            case "rowid":   // oracle type
            case "urowid":  // oracle type
            case "tinytext": // mysql type
                return typeof(String);

            // bool
            case "bit":
            case "bool":
            case "boolean":
                return typeof(Boolean);

            // int8
            case "tinyint":
                if (dataType.Length == 1)
                    return typeof(Boolean);
                // tinyint is supposed to be signed
                // but we can have explicit sign
                if (dataType.Unsigned ?? false)
                    return typeof(Byte);
                // default case, unsigned
                return typeof(SByte);

            // int16
            case "short":
            case "smallint":
                if (dataType.Unsigned ?? false)
                    return typeof(UInt16);
                return typeof(Int16);

            // int32
            case "int":
            case "integer":
            case "mediumint":
                if (dataType.Unsigned ?? false)
                    return typeof(UInt32);
                return typeof(Int32);

            // int64
            case "bigint":
                return typeof(Int64);

            // single
            case "float":
            case "float4":
            case "real":
            case "binary_float":   // oracle type
            case "unsigned float": // mysql type
            case "float unsigned": // mysql type
                return typeof(Single);

            // double
            case "double":
            case "double precision":
            case "binary_double":  // oracle type
            case "unsigned double":// mysql type
            case "double unsigned":// mysql type
                return typeof(Double);

            // decimal
            case "decimal":
            case "money":
            case "numeric":
                return typeof(Decimal);
            case "number": // special oracle type
                if (dataType.Precision.HasValue && (dataType.Scale ?? 0) == 0)
                {
                    if (dataType.Precision.Value == 1)
                        return typeof(Boolean);
                    if (dataType.Precision.Value <= 4)
                        return typeof(Int16);
                    if (dataType.Precision.Value <= 9)
                        return typeof(Int32);
                    if (dataType.Precision.Value <= 19)
                        return typeof(Int64);
                }
                return typeof(Decimal);

            // time interval
            case "interval":
                return typeof(TimeSpan);

            //enum
            case "enum":
            case "set":
                return MapEnumDbType(dataType);

            // date
            case "date":
            case "datetime":
            case "ingresdate":
            case "timestamp":
            case "timestamp without time zone":
            case "timestamp with time zone":
            case "time":
            case "time without time zone": //reported by twain_bu...@msn.com,
            case "time with time zone":
                return typeof(DateTime);

            // byte[]
            case "binary":
            case "blob":
            case "bytea":
            case "byte varying":
            case "image":
            case "longblob":
            case "long byte":
            case "oid":
            case "sytea":
            case "mediumblob":
            case "tinyblob":
            case "raw":       // oracle type
            case "long raw":  // oracle type
            case "varbinary":
                return typeof(Byte[]);

            // PostgreSQL, for example has an uuid type that can be mapped as a Guid
            case "uuid":
                return typeof(Guid);

            case "void":
                return null;

            // if we fall to this case, we must handle the type
            default:
                throw new ArgumentException(
                    string.Format("Don't know how to convert the SQL type '{0}' into a managed type.", dataTypeL),
                    "dataType");
            }
        }

        protected class EnumType : Type
        {
            internal EnumType()
            {
                EnumValues = new Dictionary<string, int>();
            }

            public string EnumName { get; set; }

            public IDictionary<string, int> EnumValues;

            #region Type overrides - the ones who make sense

            public override string Name
            {
                get { return EnumName; }
            }

            public override Type BaseType
            {
                get { return typeof(Enum); }
            }

            public override string FullName
            {
                get { return Name; } // this is a dynamic type without any qualification (namespace or assembly)
            }

            protected override bool IsArrayImpl()
            {
                return false;
            }

            protected override bool IsByRefImpl()
            {
                return false;
            }

            protected override bool IsCOMObjectImpl()
            {
                return false;
            }

            protected override bool IsPointerImpl()
            {
                return false;
            }

            protected override bool IsPrimitiveImpl()
            {
                return true;
            }

            #endregion

            #region Type overrides - the ones we don't care about
            public override object[] GetCustomAttributes(Type attributeType, bool inherit)
            {
                throw new NotImplementedException();
            }

            public override object[] GetCustomAttributes(bool inherit)
            {
                throw new NotImplementedException();
            }

            public override bool IsDefined(Type attributeType, bool inherit)
            {
                throw new NotImplementedException();
            }

            public override Assembly Assembly
            {
                get { throw new NotImplementedException(); }
            }

            public override string AssemblyQualifiedName
            {
                get { throw new NotImplementedException(); }
            }

            protected override TypeAttributes GetAttributeFlagsImpl()
            {
                throw new NotImplementedException();
            }

            protected override ConstructorInfo GetConstructorImpl(BindingFlags bindingAttr, Binder binder,
                                                                  CallingConventions callConvention, Type[] types,
                                                                  ParameterModifier[] modifiers)
            {
                throw new NotImplementedException();
            }

            public override ConstructorInfo[] GetConstructors(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override Type GetElementType()
            {
                throw new NotImplementedException();
            }

            public override EventInfo GetEvent(string name, BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override EventInfo[] GetEvents(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override FieldInfo GetField(string name, BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override FieldInfo[] GetFields(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override Type GetInterface(string name, bool ignoreCase)
            {
                throw new NotImplementedException();
            }

            public override Type[] GetInterfaces()
            {
                throw new NotImplementedException();
            }

            public override MemberInfo[] GetMembers(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            protected override MethodInfo GetMethodImpl(string name, BindingFlags bindingAttr, Binder binder,
                                                        CallingConventions callConvention, Type[] types,
                                                        ParameterModifier[] modifiers)
            {
                throw new NotImplementedException();
            }

            public override MethodInfo[] GetMethods(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override Type GetNestedType(string name, BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override Type[] GetNestedTypes(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            public override PropertyInfo[] GetProperties(BindingFlags bindingAttr)
            {
                throw new NotImplementedException();
            }

            protected override PropertyInfo GetPropertyImpl(string name, BindingFlags bindingAttr, Binder binder,
                                                            Type returnType, Type[] types, ParameterModifier[] modifiers)
            {
                throw new NotImplementedException();
            }

            public override Guid GUID
            {
                get { throw new NotImplementedException(); }
            }

            protected override bool HasElementTypeImpl()
            {
                throw new NotImplementedException();
            }

            public override object InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target,
                                                object[] args, ParameterModifier[] modifiers, CultureInfo culture,
                                                string[] namedParameters)
            {
                throw new NotImplementedException();
            }

            public override Module Module
            {
                get { throw new NotImplementedException(); }
            }

            public override string Namespace
            {
                get { throw new NotImplementedException(); }
            }

            public override Type UnderlyingSystemType
            {
                get { throw new NotImplementedException(); }
            }
            #endregion
        }

        protected static Regex DefaultEnumDefinitionEx = new Regex(@"\s*(enum|set)\s*\((?<values>.*)\s*\)\s*", RegexOptions.Compiled);
        protected static Regex EnumValuesEx = new Regex(@"\'(?<value>\w*)\'\s*,?\s*", RegexOptions.Compiled);

        /// <summary>
        /// Maps a type to enum type, if possible.
        /// </summary>
        /// <param name="dataType">Type of the data.</param>
        /// <returns></returns>
        protected virtual EnumType MapEnumDbType(IDataType dataType)
        {
            var enumType = new EnumType();
            // MySQL represents enums as follows:
            // enum('value1','value2')
            Match outerMatch = DefaultEnumDefinitionEx.Match(dataType.FullType);
            if (outerMatch.Success)
            {
                string values = outerMatch.Groups["values"].Value;
                var innerMatches = EnumValuesEx.Matches(values);
                int currentValue = 1;
                foreach (Match innerMatch in innerMatches)
                {
                    var value = innerMatch.Groups["value"].Value;
                    enumType.EnumValues[value] = currentValue++;
                }
            }
            return enumType;
        }
    }
}