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//------------------------------------------------------------------------------
// <copyright file="XmlAtomicValue.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Xml.XPath;
using System.Diagnostics;
namespace System.Xml.Schema {
/// <summary>
/// This class contains a (CLR Object, XmlType) pair that represents an instance of an Xml atomic value.
/// It is optimized to avoid boxing.
/// </summary>
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<string, string> GetNamespacesInScope(XmlNamespaceScope scope) {
Dictionary<string, string> dict = new Dictionary<string, string>(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);
}
}
/// <summary>
/// Since XmlAtomicValue is immutable, clone simply returns this.
/// </summary>
public XmlAtomicValue Clone() {
return this;
}
//-----------------------------------------------
// ICloneable methods
//-----------------------------------------------
/// <summary>
/// Since XmlAtomicValue is immutable, clone simply returns this.
/// </summary>
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;
}
}
}
}
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