XmlAtomicValue.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / schema / XmlAtomicValue.cs / 1305376 / XmlAtomicValue.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Runtime.InteropServices; 
using System.Xml.XPath;
using System.Diagnostics;

namespace System.Xml.Schema { 

    ///  
    /// This class contains a (CLR Object, XmlType) pair that represents an instance of an Xml atomic value. 
    /// It is optimized to avoid boxing.
    ///  
    public sealed class XmlAtomicValue : XPathItem, ICloneable {
        private XmlSchemaType xmlType;
        private object objVal;
        private TypeCode clrType; 
        private Union unionVal;
        private NamespacePrefixForQName nsPrefix; 
 
        [StructLayout(LayoutKind.Explicit, Size=8)]
        private struct Union { 
            [FieldOffset(0)] public bool boolVal;
            [FieldOffset(0)] public double dblVal;
            [FieldOffset(0)] public long i64Val;
            [FieldOffset(0)] public int i32Val; 
            [FieldOffset(0)] public DateTime dtVal;
        } 
 
        class NamespacePrefixForQName : IXmlNamespaceResolver {
            public string prefix; 
            public string ns;

            public NamespacePrefixForQName(string prefix, string ns) {
                this.ns = ns; 
                this.prefix = prefix;
            } 
            public string LookupNamespace(string prefix) { 
                if (prefix == this.prefix) {
                    return ns; 
                }
                return null;
            }
 
            public string LookupPrefix(string namespaceName) {
                if (ns == namespaceName) { 
                    return prefix; 
                }
                return null; 
            }

            public IDictionary GetNamespacesInScope(XmlNamespaceScope scope) {
                Dictionary dict = new Dictionary(1); 
                dict[prefix] = ns;
                return dict; 
            } 
        }
 
        //-----------------------------------------------
        // XmlAtomicValue constructors and methods
        //-----------------------------------------------
 
        internal XmlAtomicValue(XmlSchemaType xmlType, bool value) {
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType; 
            this.clrType = TypeCode.Boolean;
            this.unionVal.boolVal = value; 
        }

        internal XmlAtomicValue(XmlSchemaType xmlType, DateTime value) {
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType;
            this.clrType = TypeCode.DateTime; 
            this.unionVal.dtVal = value; 
        }
 
        internal XmlAtomicValue(XmlSchemaType xmlType, double value) {
            if (xmlType == null) throw new ArgumentNullException ("xmlType");
            this.xmlType = xmlType;
            this.clrType = TypeCode.Double; 
            this.unionVal.dblVal = value;
        } 
 
        internal XmlAtomicValue(XmlSchemaType xmlType, int value) {
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType;
            this.clrType = TypeCode.Int32;
            this.unionVal.i32Val = value;
        } 

        internal XmlAtomicValue(XmlSchemaType xmlType, long value) { 
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType;
            this.clrType = TypeCode.Int64; 
            this.unionVal.i64Val = value;
        }

        internal XmlAtomicValue(XmlSchemaType xmlType, string value) { 
            if (value == null) throw new ArgumentNullException ("value");
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType; 
            this.objVal = value;
        } 

        internal XmlAtomicValue(XmlSchemaType xmlType, string value, IXmlNamespaceResolver nsResolver) {
            if (value == null) throw new ArgumentNullException ("value");
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType;
            this.objVal = value; 
            if (nsResolver != null && (this.xmlType.TypeCode == XmlTypeCode.QName || this.xmlType.TypeCode == XmlTypeCode.Notation) ) { 
                string prefix = GetPrefixFromQName(value);
                this.nsPrefix = new NamespacePrefixForQName(prefix, nsResolver.LookupNamespace(prefix)); 
            }
        }

        internal XmlAtomicValue(XmlSchemaType xmlType, object value) { 
            if (value == null) throw new ArgumentNullException ("value");
            if (xmlType == null) throw new ArgumentNullException ("xmlType"); 
            this.xmlType = xmlType; 
            this.objVal = value;
        } 

        internal XmlAtomicValue(XmlSchemaType xmlType, object value, IXmlNamespaceResolver nsResolver) {
            if (value == null) throw new ArgumentNullException("value");
            if (xmlType == null) throw new ArgumentNullException("xmlType"); 
            this.xmlType = xmlType;
            this.objVal = value; 
 
            if (nsResolver != null && (this.xmlType.TypeCode == XmlTypeCode.QName || this.xmlType.TypeCode == XmlTypeCode.Notation) ) { //Its a qualifiedName
                XmlQualifiedName qname = this.objVal as XmlQualifiedName; 
                Debug.Assert(qname != null); //string representation is handled in a different overload
                string ns = qname.Namespace;
                this.nsPrefix = new NamespacePrefixForQName(nsResolver.LookupPrefix(ns), ns);
            } 
        }
 
        ///  
        /// Since XmlAtomicValue is immutable, clone simply returns this.
        ///  
        public XmlAtomicValue Clone() {
            return this;
        }
 

        //----------------------------------------------- 
        // ICloneable methods 
        //-----------------------------------------------
 
        /// 
        /// Since XmlAtomicValue is immutable, clone simply returns this.
        /// 
        object ICloneable.Clone() { 
            return this;
        } 
 

        //----------------------------------------------- 
        // XPathItem methods
        //-----------------------------------------------

        public override bool IsNode { 
            get { return false; }
        } 
 
        public override XmlSchemaType XmlType {
            get { return this.xmlType; } 
        }

        public override Type ValueType {
            get { return this.xmlType.Datatype.ValueType; } 
        }
 
        public override object TypedValue { 
            get {
                XmlValueConverter valueConverter = this.xmlType.ValueConverter; 

                if (this.objVal == null) {
                    switch (this.clrType) {
                        case TypeCode.Boolean: return valueConverter.ChangeType(this.unionVal.boolVal, ValueType); 
                        case TypeCode.Int32: return valueConverter.ChangeType(this.unionVal.i32Val, ValueType);
                        case TypeCode.Int64: return valueConverter.ChangeType(this.unionVal.i64Val, ValueType); 
                        case TypeCode.Double: return valueConverter.ChangeType(this.unionVal.dblVal, ValueType); 
                        case TypeCode.DateTime: return valueConverter.ChangeType(this.unionVal.dtVal, ValueType);
                        default: Debug.Assert(false, "Should never get here"); break; 
                    }
                }
                return valueConverter.ChangeType(this.objVal, ValueType, this.nsPrefix);
            } 
        }
 
        public override bool ValueAsBoolean { 
            get {
                XmlValueConverter valueConverter = this.xmlType.ValueConverter; 

                if (this.objVal == null) {
                    switch (this.clrType) {
                        case TypeCode.Boolean: return this.unionVal.boolVal; 
                        case TypeCode.Int32: return valueConverter.ToBoolean(this.unionVal.i32Val);
                        case TypeCode.Int64: return valueConverter.ToBoolean(this.unionVal.i64Val); 
                        case TypeCode.Double: return valueConverter.ToBoolean(this.unionVal.dblVal); 
                        case TypeCode.DateTime: return valueConverter.ToBoolean(this.unionVal.dtVal);
                        default: Debug.Assert(false, "Should never get here"); break; 
                    }
                }

                return valueConverter.ToBoolean(this.objVal); 
            }
        } 
 
        public override DateTime ValueAsDateTime {
            get { 
                XmlValueConverter valueConverter = this.xmlType.ValueConverter;

                if (this.objVal == null) {
                    switch (this.clrType) { 
                        case TypeCode.Boolean: return valueConverter.ToDateTime(this.unionVal.boolVal);
                        case TypeCode.Int32: return valueConverter.ToDateTime(this.unionVal.i32Val); 
                        case TypeCode.Int64: return valueConverter.ToDateTime(this.unionVal.i64Val); 
                        case TypeCode.Double: return valueConverter.ToDateTime(this.unionVal.dblVal);
                        case TypeCode.DateTime: return this.unionVal.dtVal; 
                        default: Debug.Assert(false, "Should never get here"); break;
                    }
                }
 
                return valueConverter.ToDateTime(this.objVal);
            } 
        } 

 
        public override double ValueAsDouble {
            get {
                XmlValueConverter valueConverter = this.xmlType.ValueConverter;
 
                if (this.objVal == null) {
                    switch (this.clrType) { 
                        case TypeCode.Boolean: return valueConverter.ToDouble(this.unionVal.boolVal); 
                        case TypeCode.Int32: return valueConverter.ToDouble(this.unionVal.i32Val);
                        case TypeCode.Int64: return valueConverter.ToDouble(this.unionVal.i64Val); 
                        case TypeCode.Double: return this.unionVal.dblVal;
                        case TypeCode.DateTime: return valueConverter.ToDouble(this.unionVal.dtVal);
                        default: Debug.Assert(false, "Should never get here"); break;
                    } 
                }
 
                return valueConverter.ToDouble(this.objVal); 
            }
        } 

        public override int ValueAsInt {
            get {
                XmlValueConverter valueConverter = this.xmlType.ValueConverter; 

                if (this.objVal == null) { 
                    switch (this.clrType) { 
                        case TypeCode.Boolean: return valueConverter.ToInt32(this.unionVal.boolVal);
                        case TypeCode.Int32: return this.unionVal.i32Val; 
                        case TypeCode.Int64: return valueConverter.ToInt32(this.unionVal.i64Val);
                        case TypeCode.Double: return valueConverter.ToInt32(this.unionVal.dblVal);
                        case TypeCode.DateTime: return valueConverter.ToInt32(this.unionVal.dtVal);
                        default: Debug.Assert(false, "Should never get here"); break; 
                    }
                } 
 
                return valueConverter.ToInt32(this.objVal);
            } 
        }

        public override long ValueAsLong {
            get { 
                XmlValueConverter valueConverter = this.xmlType.ValueConverter;
 
                if (this.objVal == null) { 
                    switch (this.clrType) {
                        case TypeCode.Boolean: return valueConverter.ToInt64(this.unionVal.boolVal); 
                        case TypeCode.Int32: return valueConverter.ToInt64(this.unionVal.i32Val);
                        case TypeCode.Int64: return this.unionVal.i64Val;
                        case TypeCode.Double: return valueConverter.ToInt64(this.unionVal.dblVal);
                        case TypeCode.DateTime: return valueConverter.ToInt64(this.unionVal.dtVal); 
                        default: Debug.Assert(false, "Should never get here"); break;
                    } 
                } 

                return valueConverter.ToInt64(this.objVal); 
            }
        }

        public override object ValueAs(Type type, IXmlNamespaceResolver nsResolver) { 
            XmlValueConverter valueConverter = this.xmlType.ValueConverter;
 
            if (type == typeof(XPathItem) || type == typeof(XmlAtomicValue)) 
                return this;
 
            if (this.objVal == null) {
                switch (this.clrType) {
                    case TypeCode.Boolean: return valueConverter.ChangeType(this.unionVal.boolVal, type);
                    case TypeCode.Int32: return valueConverter.ChangeType(this.unionVal.i32Val, type); 
                    case TypeCode.Int64: return valueConverter.ChangeType(this.unionVal.i64Val, type);
                    case TypeCode.Double: return valueConverter.ChangeType(this.unionVal.dblVal, type); 
                    case TypeCode.DateTime: return valueConverter.ChangeType(this.unionVal.dtVal, type); 
                    default: Debug.Assert(false, "Should never get here"); break;
                } 
            }

            return valueConverter.ChangeType(this.objVal, type, nsResolver);
        } 

        public override string Value { 
            get { 
                XmlValueConverter valueConverter = this.xmlType.ValueConverter;
 
                if (this.objVal == null) {
                    switch (this.clrType) {
                        case TypeCode.Boolean: return valueConverter.ToString(this.unionVal.boolVal);
                        case TypeCode.Int32: return valueConverter.ToString(this.unionVal.i32Val); 
                        case TypeCode.Int64: return valueConverter.ToString(this.unionVal.i64Val);
                        case TypeCode.Double: return valueConverter.ToString(this.unionVal.dblVal); 
                        case TypeCode.DateTime: return valueConverter.ToString(this.unionVal.dtVal); 
                        default: Debug.Assert(false, "Should never get here"); break;
                    } 
                }
                return valueConverter.ToString(this.objVal, this.nsPrefix);
            }
        } 

        public override string ToString() { 
            return Value; 
        }
 
        private string GetPrefixFromQName(string value) {
            int colonOffset;
            int len = ValidateNames.ParseQName(value, 0, out colonOffset);
 
            if (len == 0 || len != value.Length) {
                return null; 
            } 
            if (colonOffset != 0) {
                return value.Substring(0, colonOffset); 
            }
            else {
                return string.Empty;
            } 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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XmlAtomicValue.cs source code in C# .NET

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