Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / DataClasses / StructuralObject.cs / 1305376 / StructuralObject.cs
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
using System.Data;
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
using System.ComponentModel;
using System.Runtime.Serialization;
using System.Data.Common.Utils;
namespace System.Data.Objects.DataClasses
{
///
/// This class contains the common methods need for an date object.
///
[DataContract(IsReference = true)]
[Serializable]
public abstract class StructuralObject : INotifyPropertyChanging, INotifyPropertyChanged
{
// ------
// Fields
// ------
// This class contains no fields that are serialized, but it's important to realize that
// adding or removing a serialized field is considered a breaking change. This includes
// changing the field type or field name of existing serialized fields. If you need to make
// this kind of change, it may be possible, but it will require some custom
// serialization/deserialization code.
///
/// Public constant name used for change tracking
/// Providing this definition allows users to use this constant instead of
/// hard-coding the string. This helps to ensure the property name is correct
/// and allows faster comparisons in places where we are looking for this specific string.
/// Users can still use the case-sensitive string directly instead of the constant,
/// it will just be slightly slower on comparison.
/// Including the dash (-) character around the name ensures that this will not conflict with
/// a real data property, because -EntityKey- is not a valid identifier name
///
public static readonly string EntityKeyPropertyName = "-EntityKey-";
#region INotifyPropertyChanged Members
///
/// Notification that a property has been changed.
///
///
/// The PropertyChanged event can indicate all properties on the
/// object have changed by using either a null reference
/// (Nothing in Visual Basic) or String.Empty as the property name
/// in the PropertyChangedEventArgs.
///
[field: NonSerialized]
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region INotifyPropertyChanging Members
///
/// Notification that a property is about to be changed.
///
///
/// The PropertyChanging event can indicate all properties on the
/// object are changing by using either a null reference
/// (Nothing in Visual Basic) or String.Empty as the property name
/// in the PropertyChangingEventArgs.
///
[field: NonSerialized]
public event PropertyChangingEventHandler PropertyChanging;
#endregion
#region Protected Overrideable
///
/// Invokes the PropertyChanged event.
///
///
/// The string name of the of the changed property.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Property")]
protected virtual void OnPropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged.Invoke(this, new PropertyChangedEventArgs(property));
}
}
///
/// Invokes the PropertyChanging event.
///
///
/// The string name of the of the changing property.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Property")]
protected virtual void OnPropertyChanging(string property)
{
if (PropertyChanging != null)
{
PropertyChanging.Invoke(this, new PropertyChangingEventArgs(property));
}
}
#endregion
#region Protected Helper
///
/// The minimum DateTime value allowed in the store
///
///
/// The minimum DateTime value allowed in the store
///
protected static DateTime DefaultDateTimeValue()
{
return DateTime.Now;
}
///
/// This method is called whenever a change is going to be made to an object
/// property's value.
///
///
/// The name of the changing property.
///
///
/// The current value of the property.
///
///
/// When parameter member is null (Nothing in Visual Basic).
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Property")]
protected virtual void ReportPropertyChanging(
string property)
{
EntityUtil.CheckStringArgument(property, "property");
OnPropertyChanging(property);
}
///
/// This method is called whenever a change is made to an object
/// property's value.
///
///
/// The name for the changed property.
///
///
/// When parameter member is null (Nothing in Visual Basic).
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Property")]
protected virtual void ReportPropertyChanged(
string property)
{
EntityUtil.CheckStringArgument(property, "property");
OnPropertyChanged(property);
}
///
/// Lazily creates a complex type if the current value is null
///
///
/// Unlike most of the other helper methods in this class, this one is not static
/// because it references the SetValidValue for complex objects, which is also not static
/// because it needs a reference to this.
///
///
/// Type of complex type to get a valid value for
///
///
/// The current value of the complex type property
///
///
/// The name of the property that is calling this method
///
///
/// True if the field has already been explicitly set by the user.
///
///
/// The new value of the complex type property
///
protected internal T GetValidValue(T currentValue, string property, bool isNullable, bool isInitialized) where T : ComplexObject, new()
{
// If we support complex type inheritance we will also need to check if T is abstract
if (!isNullable && !isInitialized)
{
currentValue = SetValidValue(currentValue, new T(), property);
}
return currentValue;
}
///
/// This method is called by a ComplexObject contained in this Entity
/// whenever a change is about to be made to a property of the
/// ComplexObject so that the change can be forwarded to the change tracker.
///
///
/// The name of the top-level entity property that contains the ComplexObject that is calling this method.
///
///
/// The instance of the ComplexObject on which the property is changing.
///
///
/// The name of the changing property on complexObject.
///
internal abstract void ReportComplexPropertyChanging(
string entityMemberName, ComplexObject complexObject, string complexMemberName);
///
/// This method is called by a ComplexObject contained in this Entity
/// whenever a change has been made to a property of the
/// ComplexObject so that the change can be forwarded to the change tracker.
///
///
/// The name of the top-level entity property that contains the ComplexObject that is calling this method.
///
///
/// The instance of the ComplexObject on which the property is changing.
///
///
/// The name of the changing property on complexObject.
///
internal abstract void ReportComplexPropertyChanged(
string entityMemberName, ComplexObject complexObject, string complexMemberName);
///
/// Determines whether the structural object is attached to a change tracker or not
///
internal abstract bool IsChangeTracked { get; }
///
/// Determines whether the specified byte arrays contain identical values
///
/// The first byte array value to compare
/// The second byte array value to compare
///
/// true if both arrays are null , or if both arrays are of
/// the same length and contain the same byte values; otherwise false .
///
protected internal static bool BinaryEquals(byte[] first, byte[] second)
{
if (object.ReferenceEquals(first, second))
{
return true;
}
if (first == null || second == null)
{
return false;
}
return ByValueEqualityComparer.CompareBinaryValues(first, second);
}
///
/// Duplicates the current byte value.
///
///
/// The current byte array value
///
///
/// Must return a copy of the values because byte arrays are mutable without providing a
/// reliable mechanism for us to track changes. This allows us to treat byte arrays like
/// structs which is at least a somewhat understood mechanism.
///
protected internal static byte[] GetValidValue(byte[] currentValue)
{
if (currentValue == null)
{
return null;
}
return (byte[])currentValue.Clone();
}
///
/// Makes sure the Byte [] value being set for a property is valid.
///
///
/// The value passed into the property setter.
///
///
/// Flag indicating if this property is allowed to be null.
///
///
/// Returns the value if valid.
///
///
/// If value is null for a non nullable value.
///
protected internal static Byte[] SetValidValue(Byte[] value, bool isNullable)
{
if (value == null)
{
if (!isNullable)
{
EntityUtil.ThrowPropertyIsNotNullable();
}
return value;
}
return (byte[])value.Clone();
}
///
/// Makes sure the boolean value being set for a property is valid.
///
///
/// Boolean value.
///
///
/// The Boolean value.
///
protected internal static bool SetValidValue(bool value)
{
// no checks yet
return value;
}
///
/// Makes sure the boolean value being set for a property is valid.
///
///
/// Boolean value
///
///
/// The Boolean value.
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the byte value being set for a property is valid.
///
///
/// Byte value
///
///
/// The Byte value.
///
protected internal static byte SetValidValue(byte value)
{
// no checks yet
return value;
}
///
/// Makes sure the byte value being set for a property is valid.
///
///
/// Byte value
///
///
/// The Byte value.
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the sbyte value being set for a property is valid.
///
///
/// sbyte value
///
///
/// The sbyte value.
///
[CLSCompliant(false)]
protected internal static sbyte SetValidValue(sbyte value)
{
// no checks yet
return value;
}
///
/// Makes sure the sbyte value being set for a property is valid.
///
///
/// sbyte value
///
///
/// The sbyte value.
///
[CLSCompliant(false)]
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the datetime value being set for a property is valid.
///
///
/// datetime value
///
///
/// The datetime value.
///
protected internal static DateTime SetValidValue(DateTime value)
{
// no checks yet
return value;
}
///
/// Makes sure the datetime value being set for a property is valid.
///
///
/// datetime value
///
///
/// The datetime value.
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the timespan value being set for a property is valid.
///
///
/// timespan value
///
///
/// The timspan value.
///
protected internal static TimeSpan SetValidValue(TimeSpan value)
{
// no checks yet
return value;
}
///
/// Makes sure the TimeSpan value being set for a property is valid.
///
///
/// timespan value
///
///
/// The timespan value.
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the datetimeoffset value being set for a property is valid.
///
///
/// datetimeoffset value
///
///
/// The datetimeoffset value.
///
protected internal static DateTimeOffset SetValidValue(DateTimeOffset value)
{
// no checks yet
return value;
}
///
/// Makes sure the datetimeoffset value being set for a property is valid.
///
///
/// datetimeoffset value
///
///
/// The datetimeoffset value.
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Ensure that the input is a valid decimal value
///
/// proposed value
/// new value
protected internal static Decimal SetValidValue(Decimal value)
{
// no checks yet
return value;
}
///
/// Ensure that the value is a valid decimal
///
/// proposed value
/// the new value
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the double value being set for a property is valid.
///
///
/// double value
///
///
/// the double value
///
protected internal static double SetValidValue(double value)
{
// no checks yet
return value;
}
///
/// Makes sure the double value being set for a property is valid.
///
///
/// double value
///
///
/// the double value
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the Single value being set for a property is valid.
///
///
/// float value
///
///
/// the folad value.
///
protected internal static float SetValidValue(Single value)
{
// no checks yet
return value;
}
///
/// Makes sure the Single value being set for a property is valid.
///
///
/// nullable Single value
///
///
/// the nullabel Single value
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the Guid value being set for a property is valid.
///
///
/// Guid value
///
///
/// The Guid value
///
protected internal static Guid SetValidValue(Guid value)
{
// no checks yet
return value;
}
///
/// Makes sure the Guid value being set for a property is valid.
///
///
/// nullable Guid value
///
///
/// The nullable Guid value
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int16 value being set for a property is valid.
///
///
/// Int16 value
///
///
/// The Int16 value
///
protected internal static Int16 SetValidValue(Int16 value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int16 value being set for a property is valid.
///
///
/// nullable Int16
///
///
/// The Int16 value
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int32 value being set for a property is valid.
///
///
/// Int32 value
///
///
/// The Int32 value
///
protected internal static Int32 SetValidValue(Int32 value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int32 value being set for a property is valid.
///
///
/// nullable Int32 value
///
///
/// The nullable Int32
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int64 value being set for a property is valid.
///
///
/// Int64 value
///
///
/// The Int64 value
///
protected internal static Int64 SetValidValue(Int64 value)
{
// no checks yet
return value;
}
///
/// Makes sure the Int64 value being set for a property is valid.
///
///
/// nullable Int64 value
///
///
/// The nullable Int64 value
///
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt16 value being set for a property is valid.
///
///
/// UInt16 value
///
///
/// The UInt16 value
///
[CLSCompliant(false)]
protected internal static UInt16 SetValidValue(UInt16 value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt16 value being set for a property is valid.
///
///
/// nullable UInt16 value
///
///
/// The nullable UInt16 value
///
[CLSCompliant(false)]
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt32 value being set for a property is valid.
///
///
/// UInt32 value
///
///
/// The UInt32 value
///
[CLSCompliant(false)]
protected internal static UInt32 SetValidValue(UInt32 value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt32 value being set for a property is valid.
///
///
/// nullable UInt32 value
///
///
/// The nullable UInt32 value
///
[CLSCompliant(false)]
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt64 value being set for a property is valid.
///
///
/// UInt64 value
///
///
/// The UInt64 value
///
[CLSCompliant(false)]
protected internal static UInt64 SetValidValue(UInt64 value)
{
// no checks yet
return value;
}
///
/// Makes sure the UInt64 value being set for a property is valid.
///
///
/// nullable UInt64 value
///
///
/// The nullable UInt64 value
///
[CLSCompliant(false)]
protected internal static Nullable SetValidValue(Nullable value)
{
// no checks yet
return value;
}
///
/// Validates that the property is not longer than allowed, and throws if it is
///
///
/// string value to be checked.
///
///
/// Flag indicating if this property is allowed to be null.
///
///
/// The string value is null for a non-nullable string
///
protected internal static string SetValidValue(string value, bool isNullable)
{
if (value == null)
{
if (!isNullable)
{
EntityUtil.ThrowPropertyIsNotNullable();
}
}
return value;
}
///
/// Set a whole ComplexObject on an Entity or another ComplexObject
///
///
/// Unlike most of the other SetValidValue methods, this one is not static
/// because it uses a reference to this in order to set the parent reference for the complex object.
///
///
/// The current value that is set.
///
///
/// The new value that will be set.
///
///
/// The name of the complex type property that is being set.
///
///
/// The new value of the complex type property
///
protected internal T SetValidValue(T oldValue, T newValue, string property) where T : ComplexObject
{
// Nullable complex types are not supported in v1, but we allow setting null here if the parent entity is detached
if (newValue == null && IsChangeTracked)
{
throw EntityUtil.NullableComplexTypesNotSupported(property);
}
if (oldValue != null)
{
oldValue.DetachFromParent();
}
if (newValue != null)
{
newValue.AttachToParent(this, property);
}
return newValue;
}
///
/// Helper method used in entity/complex object factory methods to verify that a complex object is not null
///
/// Type of the complex property
/// Complex object being verified
/// Property name associated with this complex object
/// the same complex object that was passed in, if an exception didn't occur
protected internal static TComplex VerifyComplexObjectIsNotNull(TComplex complexObject, string propertyName) where TComplex : ComplexObject
{
if (complexObject == null)
{
EntityUtil.ThrowPropertyIsNotNullable(propertyName);
}
return complexObject;
}
#endregion
}
}
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