Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / schema / XmlAtomicValue.cs / 1 / 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 IDictionaryGetNamespacesInScope(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. // Copyright (c) Microsoft Corporation. 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