|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Microsoft.Xml.XPath;
using System.Diagnostics;
namespace Microsoft.Xml.Schema
{
using System;
using Microsoft.Xml;
/// <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;
}
private 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");
_xmlType = xmlType;
_clrType = TypeCode.Boolean;
_unionVal.boolVal = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, DateTime value)
{
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_clrType = TypeCode.DateTime;
_unionVal.dtVal = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, double value)
{
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_clrType = TypeCode.Double;
_unionVal.dblVal = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, int value)
{
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_clrType = TypeCode.Int32;
_unionVal.i32Val = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, long value)
{
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_clrType = TypeCode.Int64;
_unionVal.i64Val = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, string value)
{
if (value == null) throw new ArgumentNullException("value");
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_objVal = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, string value, IXmlNamespaceResolver nsResolver)
{
if (value == null) throw new ArgumentNullException("value");
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_objVal = value;
if (nsResolver != null && (_xmlType.TypeCode == XmlTypeCode.QName || _xmlType.TypeCode == XmlTypeCode.Notation))
{
string prefix = GetPrefixFromQName(value);
_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");
_xmlType = xmlType;
_objVal = value;
}
internal XmlAtomicValue(XmlSchemaType xmlType, object value, IXmlNamespaceResolver nsResolver)
{
if (value == null) throw new ArgumentNullException("value");
if (xmlType == null) throw new ArgumentNullException("xmlType");
_xmlType = xmlType;
_objVal = value;
if (nsResolver != null && (_xmlType.TypeCode == XmlTypeCode.QName || _xmlType.TypeCode == XmlTypeCode.Notation))
{ //Its a qualifiedName
XmlQualifiedName qname = _objVal as XmlQualifiedName;
Debug.Assert(qname != null); //string representation is handled in a different overload
string ns = qname.Namespace;
_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 _xmlType; }
}
public override Type ValueType
{
get { return _xmlType.Datatype.ValueType; }
}
public override object TypedValue
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ChangeType(_unionVal.boolVal, ValueType);
case TypeCode.Int32: return valueConverter.ChangeType(_unionVal.i32Val, ValueType);
case TypeCode.Int64: return valueConverter.ChangeType(_unionVal.i64Val, ValueType);
case TypeCode.Double: return valueConverter.ChangeType(_unionVal.dblVal, ValueType);
case TypeCode.DateTime: return valueConverter.ChangeType(_unionVal.dtVal, ValueType);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ChangeType(_objVal, ValueType, _nsPrefix);
}
}
public override bool ValueAsBoolean
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return _unionVal.boolVal;
case TypeCode.Int32: return valueConverter.ToBoolean(_unionVal.i32Val);
case TypeCode.Int64: return valueConverter.ToBoolean(_unionVal.i64Val);
case TypeCode.Double: return valueConverter.ToBoolean(_unionVal.dblVal);
case TypeCode.DateTime: return valueConverter.ToBoolean(_unionVal.dtVal);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToBoolean(_objVal);
}
}
public override DateTime ValueAsDateTime
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ToDateTime(_unionVal.boolVal);
case TypeCode.Int32: return valueConverter.ToDateTime(_unionVal.i32Val);
case TypeCode.Int64: return valueConverter.ToDateTime(_unionVal.i64Val);
case TypeCode.Double: return valueConverter.ToDateTime(_unionVal.dblVal);
case TypeCode.DateTime: return _unionVal.dtVal;
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToDateTime(_objVal);
}
}
public override double ValueAsDouble
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ToDouble(_unionVal.boolVal);
case TypeCode.Int32: return valueConverter.ToDouble(_unionVal.i32Val);
case TypeCode.Int64: return valueConverter.ToDouble(_unionVal.i64Val);
case TypeCode.Double: return _unionVal.dblVal;
case TypeCode.DateTime: return valueConverter.ToDouble(_unionVal.dtVal);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToDouble(_objVal);
}
}
public override int ValueAsInt
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ToInt32(_unionVal.boolVal);
case TypeCode.Int32: return _unionVal.i32Val;
case TypeCode.Int64: return valueConverter.ToInt32(_unionVal.i64Val);
case TypeCode.Double: return valueConverter.ToInt32(_unionVal.dblVal);
case TypeCode.DateTime: return valueConverter.ToInt32(_unionVal.dtVal);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToInt32(_objVal);
}
}
public override long ValueAsLong
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ToInt64(_unionVal.boolVal);
case TypeCode.Int32: return valueConverter.ToInt64(_unionVal.i32Val);
case TypeCode.Int64: return _unionVal.i64Val;
case TypeCode.Double: return valueConverter.ToInt64(_unionVal.dblVal);
case TypeCode.DateTime: return valueConverter.ToInt64(_unionVal.dtVal);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToInt64(_objVal);
}
}
public override object ValueAs(Type type, IXmlNamespaceResolver nsResolver)
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (type == typeof(XPathItem) || type == typeof(XmlAtomicValue))
return this;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ChangeType(_unionVal.boolVal, type);
case TypeCode.Int32: return valueConverter.ChangeType(_unionVal.i32Val, type);
case TypeCode.Int64: return valueConverter.ChangeType(_unionVal.i64Val, type);
case TypeCode.Double: return valueConverter.ChangeType(_unionVal.dblVal, type);
case TypeCode.DateTime: return valueConverter.ChangeType(_unionVal.dtVal, type);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ChangeType(_objVal, type, nsResolver);
}
public override string Value
{
get
{
XmlValueConverter valueConverter = _xmlType.ValueConverter;
if (_objVal == null)
{
switch (_clrType)
{
case TypeCode.Boolean: return valueConverter.ToString(_unionVal.boolVal);
case TypeCode.Int32: return valueConverter.ToString(_unionVal.i32Val);
case TypeCode.Int64: return valueConverter.ToString(_unionVal.i64Val);
case TypeCode.Double: return valueConverter.ToString(_unionVal.dblVal);
case TypeCode.DateTime: return valueConverter.ToString(_unionVal.dtVal);
default: Debug.Assert(false, "Should never get here"); break;
}
}
return valueConverter.ToString(_objVal, _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;
}
}
}
}
|