Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Objects / ObjectParameter.cs / 2 / ObjectParameter.cs
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// @owner [....]
// @backupowner [....]
//---------------------------------------------------------------------
using System;
using System.Text.RegularExpressions;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.Common.CommandTrees;
using System.Data.Metadata.Edm;
using System.Diagnostics;
namespace System.Data.Objects
{
///
/// This class represents a query parameter at the object layer, which consists
/// of a Name, a Type and a Value.
///
public sealed class ObjectParameter
{
#region Static Methods
// --------------
// Static Methods
// --------------
#region ValidateParameterName
///
/// This internal method uses regular expression matching to ensure that the
/// specified parameter name is valid. Parameter names must start with a letter,
/// and may only contain letters (A-Z, a-z), numbers (0-9) and underscores (_).
///
internal static bool ValidateParameterName (string name)
{
// Note: Parameter names must begin with a letter, and may contain only
// letters, numbers and underscores.
return DbCommandTree.IsValidParameterName(name);
}
#endregion
#endregion
#region Public Constructors
// -------------------
// Public Constructors
// -------------------
#region ObjectParameter (string, Type)
///
/// This constructor creates an unbound (i.e., value-less) parameter from the
/// specified name and type. The value can be set at any time through the
/// public 'Value' property.
///
///
/// The parameter name.
///
///
/// The CLR type of the parameter.
///
///
/// A new unbound ObjectParameter instance.
///
///
/// If the value of either argument is null.
///
///
/// If the value of the name argument is invalid. Parameter names must start
/// with a letter and may only contain letters (A-Z, a-z), numbers (0-9) and
/// underscores (_).
///
public ObjectParameter (string name, Type type)
{
EntityUtil.CheckArgumentNull(name, "name");
EntityUtil.CheckArgumentNull(type, "type");
if (!ObjectParameter.ValidateParameterName(name))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.ObjectParameter_InvalidParameterName(name), "name");
}
this._name = name;
this._type = type;
// If the parameter type is Nullable<>, we need to extract out the underlying
// Nullable<> type argument.
this.FindMappableType(this._type);
}
#endregion
#region ObjectParameter (string, object)
///
/// This constructor creates a fully-bound (i.e., valued) parameter from the
/// specified name and value. The type is inferred from the initial value, but
/// the value can be changed at any time through the public 'Value' property.
///
///
/// The parameter name.
///
///
/// The initial value (and inherently, type) of the parameter.
///
///
/// A new fully-bound ObjectParameter instance.
///
///
/// If the value of either argument is null.
///
///
/// If the value of the name argument is invalid. Parameter names must start
/// with a letter and may only contain letters (A-Z, a-z), numbers (0-9) and
/// underscores (_).
///
public ObjectParameter (string name, object value)
{
EntityUtil.CheckArgumentNull(name, "name");
EntityUtil.CheckArgumentNull(value, "value");
if (!ObjectParameter.ValidateParameterName(name))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.ObjectParameter_InvalidParameterName(name), "name");
}
this._name = name;
this._type = value.GetType();
this._value = value;
// If the parameter type is Nullable<>, we need to extract out the underlying
// Nullable<> type argument.
this.FindMappableType(this._type);
}
#endregion
#endregion
#region Private Constructors
// -------------------
// Copy Constructor
// -------------------
///
/// This constructor is used by
///
/// The existing ObjectParameter instance from which field values should be taken.
///
///
/// A new ObjectParameter instance with the same field values as the specified ObjectParameter
///
private ObjectParameter(ObjectParameter template)
{
Debug.Assert(template != null, "Template ObjectParameter cannot be null");
this._name = template._name;
this._type = template._type;
this._mappableType = template._mappableType;
this._effectiveType = template._effectiveType;
this._value = template._value;
}
#endregion
#region Private Fields
// --------------
// Private Fields
// --------------
///
/// The name of the parameter. Cannot be null and is immutable.
///
private string _name;
///
/// The CLR type of the parameter. Cannot be null and is immutable.
///
private Type _type;
///
/// The mappable CLR type of the parameter. Unless the parameter type is
/// Nullable, this type is equal to the parameter type. In the case of
/// Nullable parameters, this type is the underlying Nullable argument
/// type. Cannot be null and is immutable.
///
private Type _mappableType;
///
/// Used to specify the exact metadata type of this parameter.
/// Typically null, can only be set using the internal
private TypeUsage _effectiveType;
///
/// The value of the parameter. Does not need to be bound until execution
/// time and can be modified at any time.
///
private object _value;
#endregion
#region Public Properties
// -----------------
// Public Properties
// -----------------
///
/// The parameter name, which can only be set through a constructor.
///
public string Name
{
get
{
return this._name;
}
}
///
/// The parameter type, which can only be set through a constructor.
///
public Type ParameterType
{
get
{
return this._type;
}
}
///
/// The parameter value, which can be set at any time (and subsequently
/// changed) before query execution. Note that type-checking is not
/// enforced between the declared parameter type and the type of the
/// specified value; such validation is left up to the underlying
/// provider(s) at execution time.
///
public object Value
{
get
{
return this._value;
}
set
{
this._value = value;
}
}
#endregion
#region Internal Properties
// -------------------
// Internal Properties
// -------------------
///
/// Gets or sets a
internal TypeUsage TypeUsage
{
get
{
return _effectiveType;
}
set
{
Debug.Assert(null == _effectiveType, "Effective type should only be set once");
_effectiveType = value;
}
}
///
/// The mappable parameter type; this is primarily used to handle the case of
/// Nullable parameter types. For example, metadata knows nothing about 'int?',
/// only 'Int32'. For internal use only.
///
internal Type MappableType
{
get
{
return this._mappableType;
}
}
#endregion
#region Internal Methods
// ----------------
// Internal Methods
// ----------------
///
/// Creates a new ObjectParameter instance with identical field values to this instance.
///
/// The new ObjectParameter instance
internal ObjectParameter ShallowCopy()
{
return new ObjectParameter(this);
}
///
/// This internal method ensures that the specified type is a scalar
/// type supported by the underlying provider by ensuring that scalar
/// metadata for this type is retrievable.
///
internal bool ValidateParameterType (ClrPerspective perspective)
{
TypeUsage type = null;
// The parameter type metadata is only valid if it's scalar or enumeration type metadata.
if ((perspective.TryGetType(this._mappableType, out type)) &&
(TypeSemantics.IsPrimitiveType(type) || TypeSemantics.IsEnumerationType(type)))
{
return true;
}
return false;
}
#endregion
#region Private Methods
// ---------------
// Private Methods
// ---------------
#region FindMappableType
///
/// This private method determines the metadata-mappable type of the parameter.
/// For instance, for Int16? the mappable type is Int16. For enumerations, the
/// mappable type is Int32, etc.
///
private void FindMappableType (Type type)
{
// By default, set the underlying type of the generic to be the input type.
this._mappableType = type;
// If this is a nullable type, extract and return the underlying type of
// the generic.
if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>)))
{
this._mappableType = type.GetGenericArguments()[0];
}
}
#endregion
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// @owner [....]
// @backupowner [....]
//---------------------------------------------------------------------
using System;
using System.Text.RegularExpressions;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.Common.CommandTrees;
using System.Data.Metadata.Edm;
using System.Diagnostics;
namespace System.Data.Objects
{
///
/// This class represents a query parameter at the object layer, which consists
/// of a Name, a Type and a Value.
///
public sealed class ObjectParameter
{
#region Static Methods
// --------------
// Static Methods
// --------------
#region ValidateParameterName
///
/// This internal method uses regular expression matching to ensure that the
/// specified parameter name is valid. Parameter names must start with a letter,
/// and may only contain letters (A-Z, a-z), numbers (0-9) and underscores (_).
///
internal static bool ValidateParameterName (string name)
{
// Note: Parameter names must begin with a letter, and may contain only
// letters, numbers and underscores.
return DbCommandTree.IsValidParameterName(name);
}
#endregion
#endregion
#region Public Constructors
// -------------------
// Public Constructors
// -------------------
#region ObjectParameter (string, Type)
///
/// This constructor creates an unbound (i.e., value-less) parameter from the
/// specified name and type. The value can be set at any time through the
/// public 'Value' property.
///
///
/// The parameter name.
///
///
/// The CLR type of the parameter.
///
///
/// A new unbound ObjectParameter instance.
///
///
/// If the value of either argument is null.
///
///
/// If the value of the name argument is invalid. Parameter names must start
/// with a letter and may only contain letters (A-Z, a-z), numbers (0-9) and
/// underscores (_).
///
public ObjectParameter (string name, Type type)
{
EntityUtil.CheckArgumentNull(name, "name");
EntityUtil.CheckArgumentNull(type, "type");
if (!ObjectParameter.ValidateParameterName(name))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.ObjectParameter_InvalidParameterName(name), "name");
}
this._name = name;
this._type = type;
// If the parameter type is Nullable<>, we need to extract out the underlying
// Nullable<> type argument.
this.FindMappableType(this._type);
}
#endregion
#region ObjectParameter (string, object)
///
/// This constructor creates a fully-bound (i.e., valued) parameter from the
/// specified name and value. The type is inferred from the initial value, but
/// the value can be changed at any time through the public 'Value' property.
///
///
/// The parameter name.
///
///
/// The initial value (and inherently, type) of the parameter.
///
///
/// A new fully-bound ObjectParameter instance.
///
///
/// If the value of either argument is null.
///
///
/// If the value of the name argument is invalid. Parameter names must start
/// with a letter and may only contain letters (A-Z, a-z), numbers (0-9) and
/// underscores (_).
///
public ObjectParameter (string name, object value)
{
EntityUtil.CheckArgumentNull(name, "name");
EntityUtil.CheckArgumentNull(value, "value");
if (!ObjectParameter.ValidateParameterName(name))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.ObjectParameter_InvalidParameterName(name), "name");
}
this._name = name;
this._type = value.GetType();
this._value = value;
// If the parameter type is Nullable<>, we need to extract out the underlying
// Nullable<> type argument.
this.FindMappableType(this._type);
}
#endregion
#endregion
#region Private Constructors
// -------------------
// Copy Constructor
// -------------------
///
/// This constructor is used by
///
/// The existing ObjectParameter instance from which field values should be taken.
///
///
/// A new ObjectParameter instance with the same field values as the specified ObjectParameter
///
private ObjectParameter(ObjectParameter template)
{
Debug.Assert(template != null, "Template ObjectParameter cannot be null");
this._name = template._name;
this._type = template._type;
this._mappableType = template._mappableType;
this._effectiveType = template._effectiveType;
this._value = template._value;
}
#endregion
#region Private Fields
// --------------
// Private Fields
// --------------
///
/// The name of the parameter. Cannot be null and is immutable.
///
private string _name;
///
/// The CLR type of the parameter. Cannot be null and is immutable.
///
private Type _type;
///
/// The mappable CLR type of the parameter. Unless the parameter type is
/// Nullable, this type is equal to the parameter type. In the case of
/// Nullable parameters, this type is the underlying Nullable argument
/// type. Cannot be null and is immutable.
///
private Type _mappableType;
///
/// Used to specify the exact metadata type of this parameter.
/// Typically null, can only be set using the internal
private TypeUsage _effectiveType;
///
/// The value of the parameter. Does not need to be bound until execution
/// time and can be modified at any time.
///
private object _value;
#endregion
#region Public Properties
// -----------------
// Public Properties
// -----------------
///
/// The parameter name, which can only be set through a constructor.
///
public string Name
{
get
{
return this._name;
}
}
///
/// The parameter type, which can only be set through a constructor.
///
public Type ParameterType
{
get
{
return this._type;
}
}
///
/// The parameter value, which can be set at any time (and subsequently
/// changed) before query execution. Note that type-checking is not
/// enforced between the declared parameter type and the type of the
/// specified value; such validation is left up to the underlying
/// provider(s) at execution time.
///
public object Value
{
get
{
return this._value;
}
set
{
this._value = value;
}
}
#endregion
#region Internal Properties
// -------------------
// Internal Properties
// -------------------
///
/// Gets or sets a
internal TypeUsage TypeUsage
{
get
{
return _effectiveType;
}
set
{
Debug.Assert(null == _effectiveType, "Effective type should only be set once");
_effectiveType = value;
}
}
///
/// The mappable parameter type; this is primarily used to handle the case of
/// Nullable parameter types. For example, metadata knows nothing about 'int?',
/// only 'Int32'. For internal use only.
///
internal Type MappableType
{
get
{
return this._mappableType;
}
}
#endregion
#region Internal Methods
// ----------------
// Internal Methods
// ----------------
///
/// Creates a new ObjectParameter instance with identical field values to this instance.
///
/// The new ObjectParameter instance
internal ObjectParameter ShallowCopy()
{
return new ObjectParameter(this);
}
///
/// This internal method ensures that the specified type is a scalar
/// type supported by the underlying provider by ensuring that scalar
/// metadata for this type is retrievable.
///
internal bool ValidateParameterType (ClrPerspective perspective)
{
TypeUsage type = null;
// The parameter type metadata is only valid if it's scalar or enumeration type metadata.
if ((perspective.TryGetType(this._mappableType, out type)) &&
(TypeSemantics.IsPrimitiveType(type) || TypeSemantics.IsEnumerationType(type)))
{
return true;
}
return false;
}
#endregion
#region Private Methods
// ---------------
// Private Methods
// ---------------
#region FindMappableType
///
/// This private method determines the metadata-mappable type of the parameter.
/// For instance, for Int16? the mappable type is Int16. For enumerations, the
/// mappable type is Int32, etc.
///
private void FindMappableType (Type type)
{
// By default, set the underlying type of the generic to be the input type.
this._mappableType = type;
// If this is a nullable type, extract and return the underlying type of
// the generic.
if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>)))
{
this._mappableType = type.GetGenericArguments()[0];
}
}
#endregion
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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