ScalarType.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / ScalarType.cs / 1305376 / ScalarType.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Data.SqlTypes; 
using System.Diagnostics;
using System.Globalization; 
using System.Xml; 
using System.Data.Metadata.Edm;
 

namespace System.Data.EntityModel.SchemaObjectModel
{
    ///  
    /// This is an adapter to make PrimitiveTypeKindData fit in the Schema Object Model tree
    ///  
    internal sealed class ScalarType : SchemaType 
    {
        internal const string DateTimeFormat = @"yyyy-MM-dd HH\:mm\:ss.fffZ"; 
        internal const string TimeFormat = @"HH\:mm\:ss.fffffffZ";
        internal const string DateTimeOffsetFormat = @"yyyy-MM-dd HH\:mm\:ss.fffffffz";
        private readonly static System.Text.RegularExpressions.Regex _BinaryValueValidator = new System.Text.RegularExpressions.Regex("^0[xX][0-9a-fA-F]+$", System.Text.RegularExpressions.RegexOptions.Compiled);
        private readonly static System.Text.RegularExpressions.Regex _GuidValueValidator = new System.Text.RegularExpressions.Regex("[0-9a-fA-F]{8,8}(-[0-9a-fA-F]{4,4}){3,3}-[0-9a-fA-F]{12,12}", System.Text.RegularExpressions.RegexOptions.Compiled); 

        private PrimitiveType _primitiveType = null; 
 
        /// 
        /// Construct an internal (not from schema) CDM scalar type 
        /// 
        /// the owning schema
        /// the naem of the type
        /// the PrimitiveTypeKind of the type 
        internal ScalarType(Schema parentElement, string typeName, PrimitiveType primitiveType)
        : base(parentElement) 
        { 
            Name = typeName;
            _primitiveType = primitiveType; 
        }

        /// 
        /// try to parse a string 
        /// 
        /// the string to parse 
        /// the value of the string 
        /// true if the value is a valid value, false otherwise
        public bool TryParse(string text, out object value) 
        {
            switch(_primitiveType.PrimitiveTypeKind)
            {
                case PrimitiveTypeKind.Binary: 
                    return TryParseBinary(text, out value);
                case PrimitiveTypeKind.Boolean: 
                    return TryParseBoolean(text, out value); 
                case PrimitiveTypeKind.Byte:
                    return TryParseByte(text, out value); 
                case PrimitiveTypeKind.DateTime:
                    return TryParseDateTime(text, out value);
                case PrimitiveTypeKind.Time:
                    return TryParseTime(text, out value); 
                case PrimitiveTypeKind.DateTimeOffset:
                    return TryParseDateTimeOffset(text, out value); 
                case PrimitiveTypeKind.Decimal: 
                    return TryParseDecimal(text, out value);
                case PrimitiveTypeKind.Double: 
                    return TryParseDouble(text, out value);
                case PrimitiveTypeKind.Guid:
                    return TryParseGuid(text, out value);
                case PrimitiveTypeKind.Int16: 
                    return TryParseInt16(text, out value);
                case PrimitiveTypeKind.Int32: 
                    return TryParseInt32(text, out value); 
                case PrimitiveTypeKind.Int64:
                    return TryParseInt64(text, out value); 
                case PrimitiveTypeKind.Single:
                    return TryParseSingle(text, out value);
                case PrimitiveTypeKind.String:
                    return TryParseString(text, out value); 
                case PrimitiveTypeKind.SByte:
                    return TryParseSByte(text, out value); 
                default: 
                    throw EntityUtil.NotSupported(_primitiveType.FullName);
            } 
        }

        /// 
        /// The type kind of this type. 
        /// 
        public PrimitiveTypeKind TypeKind 
        { 
            get
            { 
                return _primitiveType.PrimitiveTypeKind;
            }
        }
 
        /// 
        /// Returns the PrimitiveType of the scalar type. 
        ///  
        public PrimitiveType Type
        { 
            get
            {
                return _primitiveType;
            } 
        }
 
        private static bool TryParseBoolean(string text, out object value) 
        {
            Boolean temp; 
            if (!Boolean.TryParse(text, out temp))
            {
                value = null;
                return false; 
            }
            value = temp; 
            return true; 
        }
 
        private static bool TryParseByte(string text, out object value)
        {
            Byte temp;
            if (!Byte.TryParse(text, System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out temp)) 
            {
                value = null; 
                return false; 
            }
            value = temp; 
            return true;
        }

        private static bool TryParseSByte(string text, out object value) 
        {
            SByte temp; 
            if (!SByte.TryParse(text, System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out temp)) 
            {
                value = null; 
                return false;
            }
            value = temp;
            return true; 
        }
 
        private static bool TryParseInt16(string text, out object value) 
        {
            Int16 temp; 
            if (!Int16.TryParse(text, System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out temp))
            {
                value = null;
                return false; 
            }
            value = temp; 
            return true; 
        }
 
        private static bool TryParseInt32(string text, out object value)
        {
            Int32 temp;
            if (!Int32.TryParse(text, System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out temp)) 
            {
                value = null; 
                return false; 
            }
            value = temp; 
            return true;
        }

        private static bool TryParseInt64(string text, out object value) 
        {
            Int64 temp; 
            if (!Int64.TryParse(text, System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out temp)) 
            {
                value = null; 
                return false;
            }
            value = temp;
            return true; 
        }
 
        private static bool TryParseDouble(string text, out object value) 
        {
            Double temp; 
            if (!Double.TryParse(text, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out temp))
            {
                value = null;
                return false; 
            }
            value = temp; 
            return true; 
        }
 
        private static bool TryParseDecimal(string text, out object value)
        {
            Decimal temp;
            if (!Decimal.TryParse(text, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out temp)) 
            {
                value = null; 
                return false; 
            }
            value = temp; 
            return true;
        }

        private static bool TryParseDateTime(string text, out object value) 
        {
            DateTime temp; 
            if (!DateTime.TryParseExact(text, DateTimeFormat, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, out temp)) 
            {
                value = null; 
                return false;
            }

            value = temp; 
            return true;
        } 
 
        /// 
        /// Parses the default value for Edm Type Time based on the DateTime format "HH:mm:ss.fffffffz". 
        /// The value is first converted to DateTime value and then converted to TimeSpan.
        /// 
        /// 
        ///  
        /// 
        private static bool TryParseTime(string text, out object value) 
        { 
            DateTime temp;
            if (!DateTime.TryParseExact(text, TimeFormat, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, out temp)) 
            {
                value = null;
                return false;
            } 
            value = new TimeSpan(temp.Ticks);
            return true; 
        } 

        private static bool TryParseDateTimeOffset(string text, out object value) 
        {
            DateTimeOffset temp;
            if (!DateTimeOffset.TryParse(text, out temp))
            { 
                value = null;
                return false; 
            } 
            value = temp;
            return true; 
        }


 
        private static bool TryParseGuid(string text, out object value)
        { 
            if (!_GuidValueValidator.IsMatch(text)) 
            {
                value = null; 
                return false;
            }
            value = new Guid(text);
            return true; 
        }
 
        private static bool TryParseString(string text, out object value) 
        {
            value = text; 
            return true;
        }

        private static bool TryParseBinary(string text, out object value) 
        {
            //value must look like 0xddddd... 
            if (!_BinaryValueValidator.IsMatch(text)) 
            {
                value = null; 
                return false;
            }

            // strip off the 0x 
            string binaryPart = text.Substring(2);
 
            value = ConvertToByteArray(binaryPart); 

            return true; 
        }

        internal static byte[] ConvertToByteArray(string text)
        { 
            int inc = 2;
            int numBytes = (text.Length) / 2; 
 
            // adjust for case where we have 1F7 instead of 01F7
            if (text.Length % 2 == 1) 
            {
                inc = 1;
                numBytes++;
            } 

            byte[] bytes = new byte[numBytes]; 
            for (int index = 0, iByte = 0; index < text.Length; index += inc, inc = 2, ++iByte) 
            {
                bytes[iByte] = byte.Parse(text.Substring(index, inc), System.Globalization.NumberStyles.HexNumber, System.Globalization.CultureInfo.InvariantCulture); 
            }
            return bytes;
        }
 
        private static bool TryParseSingle(string text, out object value)
        { 
            Single temp; 
            if (!Single.TryParse(text, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out temp))
            { 
                value = null;
                return false;
            }
            value = temp; 
            return true;
        } 
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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