Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / Util.cs / 1625574 / Util.cs
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// static utility functions
//
//---------------------------------------------------------------------
namespace System.Data.Services.Client
{
#region Namespaces.
using System.Collections;
using System.Diagnostics;
using System.Xml;
using System.Reflection;
using System.Linq.Expressions;
#endregion Namespaces.
///
/// static utility function
///
internal static class Util
{
///
/// String Suffix on outgoing version numbers
///
internal const string VersionSuffix = ";NetFx";
/// Tool name for the GeneratedCode attribute used by Astoria CodeGen
internal const string CodeGeneratorToolName = "System.Data.Services.Design";
///
/// Empty Data Service Version - represents a blank DSV header
///
internal static readonly Version DataServiceVersionEmpty = new Version(0, 0);
///
/// Data Service Version 1
///
internal static readonly Version DataServiceVersion1 = new Version(1, 0);
///
/// Data Service Version 2
///
internal static readonly Version DataServiceVersion2 = new Version(2, 0);
///
/// Default maximum data service version this client can handle
///
internal static readonly Version MaxResponseVersion = DataServiceVersion2;
///
/// Data service versions supported on the client
///
internal static readonly Version[] SupportedResponseVersions =
{
DataServiceVersion1,
DataServiceVersion2
};
/// forward slash char array for triming uris
internal static readonly char[] ForwardSlash = new char[1] { '/' };
///
/// static char[] for indenting whitespace when tracing xml
///
private static char[] whitespaceForTracing = new char[] { '\r', '\n', ' ', ' ', ' ', ' ', ' ' };
#if DEBUG
///
/// DebugFaultInjector is a test hook to inject faults in specific locations. The string is the ID for the location
///
private static Action DebugFaultInjector = new Action((s) => { });
///
/// ReferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
private static Func referenceIdentity = delegate(String identity)
{
return identity;
};
///
/// DereferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
private static Func dereferenceIdentity = delegate(String identity)
{
return identity;
};
#endif
///
/// DebugInjectFault is a test hook to inject faults in specific locations. The string is the ID for the location
///
/// The injector state parameter
[Conditional("DEBUG")]
internal static void DebugInjectFault(string state)
{
#if DEBUG
DebugFaultInjector(state);
#endif
}
///
/// ReferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
/// The uri argument
/// Returned value by the referenceIdentity hook
internal static String ReferenceIdentity(String uri)
{
#if DEBUG
return referenceIdentity(uri);
#else
return uri;
#endif
}
///
/// DereferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
/// The uri argument
/// returned value by the dereferenceIdentity hook
internal static String DereferenceIdentity(String uri)
{
#if DEBUG
return dereferenceIdentity(uri);
#else
return uri;
#endif
}
///
/// Checks the argument value for null and throw ArgumentNullException if it is null
///
/// type of the argument to prevent accidental boxing of value types
/// argument whose value needs to be checked
/// name of the argument
/// if value is null
/// value
internal static T CheckArgumentNull(T value, string parameterName) where T : class
{
if (null == value)
{
throw Error.ArgumentNull(parameterName);
}
return value;
}
///
/// Checks the string value is not empty
///
/// value to check
/// parameterName of public function
/// if value is null
/// if value is empty
internal static void CheckArgumentNotEmpty(string value, string parameterName)
{
CheckArgumentNull(value, parameterName);
if (0 == value.Length)
{
throw Error.Argument(Strings.Util_EmptyString, parameterName);
}
}
///
/// Checks the array value is not empty
///
/// type of the argument to prevent accidental boxing of value types
/// value to check
/// parameterName of public function
/// if value is null
/// if value is empty or contains null elements
internal static void CheckArgumentNotEmpty(T[] value, string parameterName) where T : class
{
CheckArgumentNull(value, parameterName);
if (0 == value.Length)
{
throw Error.Argument(Strings.Util_EmptyArray, parameterName);
}
for (int i = 0; i < value.Length; ++i)
{
if (Object.ReferenceEquals(value[i], null))
{
throw Error.Argument(Strings.Util_NullArrayElement, parameterName);
}
}
}
///
/// Validate MergeOption
///
/// option to validate
/// name of the parameter being validated
/// if option is not valid
/// option
internal static MergeOption CheckEnumerationValue(MergeOption value, string parameterName)
{
switch (value)
{
case MergeOption.AppendOnly:
case MergeOption.OverwriteChanges:
case MergeOption.PreserveChanges:
case MergeOption.NoTracking:
return value;
default:
throw Error.ArgumentOutOfRange(parameterName);
}
}
#if ASTORIA_LIGHT // Multiple HTTP stacks in Silverlight
///
/// Validate HttpStack
///
/// option to validate
/// name of the parameter being validated
/// if option is not valid
/// option
internal static HttpStack CheckEnumerationValue(HttpStack value, string parameterName)
{
switch (value)
{
case HttpStack.Auto:
case HttpStack.ClientHttp:
case HttpStack.XmlHttp:
return value;
default:
throw Error.ArgumentOutOfRange(parameterName);
}
}
#endif
///
/// get char[] for indenting whitespace when tracing xml
///
/// how many characters to trace
/// char[]
internal static char[] GetWhitespaceForTracing(int depth)
{
char[] whitespace = Util.whitespaceForTracing;
while (whitespace.Length <= depth)
{
char[] tmp = new char[2 * whitespace.Length];
tmp[0] = '\r';
tmp[1] = '\n';
for (int i = 2; i < tmp.Length; ++i)
{
tmp[i] = ' ';
}
System.Threading.Interlocked.CompareExchange(ref Util.whitespaceForTracing, tmp, whitespace);
whitespace = tmp;
}
return whitespace;
}
/// new Uri(string uriString, UriKind uriKind)
/// value
/// kind
/// new Uri(value, kind)
internal static Uri CreateUri(string value, UriKind kind)
{
return value == null ? null : new Uri(value, kind);
}
/// new Uri(Uri baseUri, Uri requestUri)
/// baseUri
/// relativeUri
/// new Uri(baseUri, requestUri)
internal static Uri CreateUri(Uri baseUri, Uri requestUri)
{
Debug.Assert((null != baseUri) && baseUri.IsAbsoluteUri, "baseUri !IsAbsoluteUri");
Debug.Assert(String.IsNullOrEmpty(baseUri.Query) && String.IsNullOrEmpty(baseUri.Fragment), "baseUri has query or fragment");
Util.CheckArgumentNull(requestUri, "requestUri");
// there is a bug in (new Uri(Uri,Uri)) which corrupts the port of the result if out relativeUri is also absolute
if (!requestUri.IsAbsoluteUri)
{
if (baseUri.OriginalString.EndsWith("/", StringComparison.Ordinal))
{
if (requestUri.OriginalString.StartsWith("/", StringComparison.Ordinal))
{
requestUri = new Uri(baseUri, Util.CreateUri(requestUri.OriginalString.TrimStart(Util.ForwardSlash), UriKind.Relative));
}
else
{
requestUri = new Uri(baseUri, requestUri);
}
}
else
{
requestUri = Util.CreateUri(baseUri.OriginalString + "/" + requestUri.OriginalString.TrimStart(Util.ForwardSlash), UriKind.Absolute);
}
}
return requestUri;
}
///
/// does the array contain the value reference
///
/// generic type
/// array to search
/// value being looked for
/// true if value reference was found in array
internal static bool ContainsReference(T[] array, T value) where T : class
{
return (0 <= IndexOfReference(array, value));
}
/// dispose of the object and set the reference to null
/// type that implements IDisposable
/// object to dispose
internal static void Dispose(ref T disposable) where T : class, IDisposable
{
Dispose(disposable);
disposable = null;
}
/// dispose of the object
/// type that implements IDisposable
/// object to dispose
internal static void Dispose(T disposable) where T : class, IDisposable
{
if (null != disposable)
{
disposable.Dispose();
}
}
///
/// index of value reference in the array
///
/// generic type
/// array to search
/// value being looked for
/// index of value reference in the array else (-1)
internal static int IndexOfReference(T[] array, T value) where T : class
{
Debug.Assert(null != array, "null array");
for (int i = 0; i < array.Length; ++i)
{
if (object.ReferenceEquals(array[i], value))
{
return i;
}
}
return -1;
}
/// Checks whether the exception should not be handled.
/// exception to test
/// true if the exception should not be handled
internal static bool DoNotHandleException(Exception ex)
{
return ((null != ex) &&
((ex is System.StackOverflowException) ||
(ex is System.OutOfMemoryException) ||
(ex is System.Threading.ThreadAbortException)));
}
///
/// Checks whether the exception type is one of the DataService*Exception
///
/// exception to test
/// true if the exception type is one of the DataService*Exception
internal static bool IsKnownClientExcption(Exception ex)
{
return (ex is DataServiceClientException) || (ex is DataServiceQueryException) || (ex is DataServiceRequestException);
}
/// validate value is non-null
/// type of value
/// value
/// error code to throw if null
/// the non-null value
internal static T NullCheck(T value, InternalError errorcode) where T : class
{
if (Object.ReferenceEquals(value, null))
{
Error.ThrowInternalError(errorcode);
}
return value;
}
/// are the two values the same reference
/// value1
/// value2
/// true if they are the same reference
internal static bool AreSame(string value1, string value2)
{
// bool result = Object.ReferenceEquals(value1, value2);
// Debug.Assert(result == (value1 == value2), "!NameTable - unable to do reference comparison on '" + value1 + "'");
// XElement uses a global name table which may have encountered
// our strings first and return a different instance than what was expected
bool result = (value1 == value2);
return result;
}
/// is the reader on contentNode where the localName and namespaceUri match
/// reader
/// localName
/// namespaceUri
/// true if localName and namespaceUri match reader current element
internal static bool AreSame(XmlReader reader, string localName, string namespaceUri)
{
Debug.Assert((null != reader) && (null != localName) && (null != namespaceUri), "null");
return ((XmlNodeType.Element == reader.NodeType) || (XmlNodeType.EndElement == reader.NodeType)) &&
AreSame(reader.LocalName, localName) && AreSame(reader.NamespaceURI, namespaceUri);
}
///
/// check the atom:null="true" attribute
///
/// XmlReader
/// true of null is true
internal static bool DoesNullAttributeSayTrue(XmlReader reader)
{
string attributeValue = reader.GetAttribute(XmlConstants.AtomNullAttributeName, XmlConstants.DataWebMetadataNamespace);
return ((null != attributeValue) && XmlConvert.ToBoolean(attributeValue));
}
/// Checks whether the specified
/// Type to check.
/// true if type is a reference type or a Nullable type; false otherwise.
internal static bool TypeAllowsNull(Type type)
{
Debug.Assert(type != null, "type != null");
return !type.IsValueType || IsNullableType(type);
}
/// Gets a type for
/// Type to base resulting type on.
///
///
internal static Type GetTypeAllowingNull(Type type)
{
Debug.Assert(type != null, "type != null");
return TypeAllowsNull(type) ? type : typeof(Nullable<>).MakeGenericType(type);
}
/// Set the continuation for the following results for a collection.
/// The collection to set the links to
/// The continuation for the collection.
internal static void SetNextLinkForCollection(object collection, DataServiceQueryContinuation continuation)
{
Debug.Assert(collection != null, "collection != null");
// We do a convention call for setting Continuation. We'll invoke this
// for all properties named 'Continuation' that is a DataServiceQueryContinuation
// (assigning to a single one would make it inconsistent if reflection
// order is changed).
foreach (var property in collection.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public))
{
if (property.Name != "Continuation" || !property.CanWrite)
{
continue;
}
if (typeof(DataServiceQueryContinuation).IsAssignableFrom(property.PropertyType))
{
property.SetValue(collection, continuation, null);
}
}
}
///
/// Similar to Activator.CreateInstance, but uses LCG to avoid
/// more stringent Reflection security constraints.in Silverlight
///
/// Type to create.
/// Arguments.
/// The newly instantiated object.
internal static object ActivatorCreateInstance(Type type, params object[] arguments)
{
Debug.Assert(type != null, "type != null");
#if ASTORIA_LIGHT
// Look up the constructor
// We don't do overload resolution, make sure that the specific type has only one constructor with specified number of arguments
int argumentCount = (arguments == null) ? 0 : arguments.Length;
ConstructorInfo[] constructors = type.GetConstructors();
ConstructorInfo constructor = null;
for (int i = 0; i < constructors.Length; i++)
{
if (constructors[i].GetParameters().Length == argumentCount)
{
Debug.Assert( constructor == null, "Make sure that the specific type has only one constructor with specified argument count");
constructor = constructors[i];
#if !DEBUG
break;
#endif
}
}
// A constructor should have been found, but we could run into a case with
// complex types where there is no default constructor. A better error
// message can be provided after localization freeze.
if (constructor == null)
{
throw new MissingMethodException();
}
return ConstructorInvoke(constructor, arguments);
#else // ASTORIA_LIGHT
return Activator.CreateInstance(type, arguments);
#endif
}
///
/// Similar to ConstructorInfo.Invoke, but uses LCG to avoid
/// more stringent Reflection security constraints in Silverlight
///
/// Constructor to invoke.
/// Arguments.
/// The newly instantiated object.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
internal static object ConstructorInvoke(ConstructorInfo constructor, object[] arguments)
{
if (constructor == null)
{
throw new MissingMethodException();
}
#if ASTORIA_LIGHT
int argumentCount = (arguments == null) ? 0 : arguments.Length;
ParameterExpression argumentsExpression = Expression.Parameter(typeof(object[]), "arguments");
Expression[] argumentExpressions = new Expression[argumentCount];
ParameterInfo[] parameters = constructor.GetParameters();
for (int i = 0; i < argumentExpressions.Length; i++)
{
argumentExpressions[i] = Expression.Constant(arguments[i], parameters[i].ParameterType);
}
Expression newExpression = Expression.New(constructor, argumentExpressions);
Expression> lambda = Expression.Lambda>(
Expression.Convert(newExpression, typeof(object)),
argumentsExpression);
object result = lambda.Compile()(arguments);
return result;
#else
return constructor.Invoke(arguments);
#endif
}
#region Tracing
///
/// trace Element node
///
/// XmlReader
/// TextWriter
[Conditional("TRACE")]
internal static void TraceElement(XmlReader reader, System.IO.TextWriter writer)
{
Debug.Assert(XmlNodeType.Element == reader.NodeType, "not positioned on Element");
if (null != writer)
{
writer.Write(Util.GetWhitespaceForTracing(2 + reader.Depth), 0, 2 + reader.Depth);
writer.Write("<{0}", reader.Name);
if (reader.MoveToFirstAttribute())
{
do
{
writer.Write(" {0}=\"{1}\"", reader.Name, reader.Value);
}
while (reader.MoveToNextAttribute());
reader.MoveToElement();
}
writer.Write(reader.IsEmptyElement ? " />" : ">");
}
}
///
/// trace EndElement node
///
/// XmlReader
/// TextWriter
/// indent or not
[Conditional("TRACE")]
internal static void TraceEndElement(XmlReader reader, System.IO.TextWriter writer, bool indent)
{
if (null != writer)
{
if (indent)
{
writer.Write(Util.GetWhitespaceForTracing(2 + reader.Depth), 0, 2 + reader.Depth);
}
writer.Write("", reader.Name);
}
}
///
/// trace string value
///
/// TextWriter
/// value
[Conditional("TRACE")]
internal static void TraceText(System.IO.TextWriter writer, string value)
{
if (null != writer)
{
writer.Write(value);
}
}
#endregion
/// Checks whether the specified type is a generic nullable type.
/// Type to check.
/// true if
private static bool IsNullableType(Type type)
{
return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// static utility functions
//
//---------------------------------------------------------------------
namespace System.Data.Services.Client
{
#region Namespaces.
using System.Collections;
using System.Diagnostics;
using System.Xml;
using System.Reflection;
using System.Linq.Expressions;
#endregion Namespaces.
///
/// static utility function
///
internal static class Util
{
///
/// String Suffix on outgoing version numbers
///
internal const string VersionSuffix = ";NetFx";
/// Tool name for the GeneratedCode attribute used by Astoria CodeGen
internal const string CodeGeneratorToolName = "System.Data.Services.Design";
///
/// Empty Data Service Version - represents a blank DSV header
///
internal static readonly Version DataServiceVersionEmpty = new Version(0, 0);
///
/// Data Service Version 1
///
internal static readonly Version DataServiceVersion1 = new Version(1, 0);
///
/// Data Service Version 2
///
internal static readonly Version DataServiceVersion2 = new Version(2, 0);
///
/// Default maximum data service version this client can handle
///
internal static readonly Version MaxResponseVersion = DataServiceVersion2;
///
/// Data service versions supported on the client
///
internal static readonly Version[] SupportedResponseVersions =
{
DataServiceVersion1,
DataServiceVersion2
};
/// forward slash char array for triming uris
internal static readonly char[] ForwardSlash = new char[1] { '/' };
///
/// static char[] for indenting whitespace when tracing xml
///
private static char[] whitespaceForTracing = new char[] { '\r', '\n', ' ', ' ', ' ', ' ', ' ' };
#if DEBUG
///
/// DebugFaultInjector is a test hook to inject faults in specific locations. The string is the ID for the location
///
private static Action DebugFaultInjector = new Action((s) => { });
///
/// ReferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
private static Func referenceIdentity = delegate(String identity)
{
return identity;
};
///
/// DereferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
private static Func dereferenceIdentity = delegate(String identity)
{
return identity;
};
#endif
///
/// DebugInjectFault is a test hook to inject faults in specific locations. The string is the ID for the location
///
/// The injector state parameter
[Conditional("DEBUG")]
internal static void DebugInjectFault(string state)
{
#if DEBUG
DebugFaultInjector(state);
#endif
}
///
/// ReferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
/// The uri argument
/// Returned value by the referenceIdentity hook
internal static String ReferenceIdentity(String uri)
{
#if DEBUG
return referenceIdentity(uri);
#else
return uri;
#endif
}
///
/// DereferenceIdentity is a test hook to help verify we dont' use identity instead of editLink
///
/// The uri argument
/// returned value by the dereferenceIdentity hook
internal static String DereferenceIdentity(String uri)
{
#if DEBUG
return dereferenceIdentity(uri);
#else
return uri;
#endif
}
///
/// Checks the argument value for null and throw ArgumentNullException if it is null
///
/// type of the argument to prevent accidental boxing of value types
/// argument whose value needs to be checked
/// name of the argument
/// if value is null
/// value
internal static T CheckArgumentNull(T value, string parameterName) where T : class
{
if (null == value)
{
throw Error.ArgumentNull(parameterName);
}
return value;
}
///
/// Checks the string value is not empty
///
/// value to check
/// parameterName of public function
/// if value is null
/// if value is empty
internal static void CheckArgumentNotEmpty(string value, string parameterName)
{
CheckArgumentNull(value, parameterName);
if (0 == value.Length)
{
throw Error.Argument(Strings.Util_EmptyString, parameterName);
}
}
///
/// Checks the array value is not empty
///
/// type of the argument to prevent accidental boxing of value types
/// value to check
/// parameterName of public function
/// if value is null
/// if value is empty or contains null elements
internal static void CheckArgumentNotEmpty(T[] value, string parameterName) where T : class
{
CheckArgumentNull(value, parameterName);
if (0 == value.Length)
{
throw Error.Argument(Strings.Util_EmptyArray, parameterName);
}
for (int i = 0; i < value.Length; ++i)
{
if (Object.ReferenceEquals(value[i], null))
{
throw Error.Argument(Strings.Util_NullArrayElement, parameterName);
}
}
}
///
/// Validate MergeOption
///
/// option to validate
/// name of the parameter being validated
/// if option is not valid
/// option
internal static MergeOption CheckEnumerationValue(MergeOption value, string parameterName)
{
switch (value)
{
case MergeOption.AppendOnly:
case MergeOption.OverwriteChanges:
case MergeOption.PreserveChanges:
case MergeOption.NoTracking:
return value;
default:
throw Error.ArgumentOutOfRange(parameterName);
}
}
#if ASTORIA_LIGHT // Multiple HTTP stacks in Silverlight
///
/// Validate HttpStack
///
/// option to validate
/// name of the parameter being validated
/// if option is not valid
/// option
internal static HttpStack CheckEnumerationValue(HttpStack value, string parameterName)
{
switch (value)
{
case HttpStack.Auto:
case HttpStack.ClientHttp:
case HttpStack.XmlHttp:
return value;
default:
throw Error.ArgumentOutOfRange(parameterName);
}
}
#endif
///
/// get char[] for indenting whitespace when tracing xml
///
/// how many characters to trace
/// char[]
internal static char[] GetWhitespaceForTracing(int depth)
{
char[] whitespace = Util.whitespaceForTracing;
while (whitespace.Length <= depth)
{
char[] tmp = new char[2 * whitespace.Length];
tmp[0] = '\r';
tmp[1] = '\n';
for (int i = 2; i < tmp.Length; ++i)
{
tmp[i] = ' ';
}
System.Threading.Interlocked.CompareExchange(ref Util.whitespaceForTracing, tmp, whitespace);
whitespace = tmp;
}
return whitespace;
}
/// new Uri(string uriString, UriKind uriKind)
/// value
/// kind
/// new Uri(value, kind)
internal static Uri CreateUri(string value, UriKind kind)
{
return value == null ? null : new Uri(value, kind);
}
/// new Uri(Uri baseUri, Uri requestUri)
/// baseUri
/// relativeUri
/// new Uri(baseUri, requestUri)
internal static Uri CreateUri(Uri baseUri, Uri requestUri)
{
Debug.Assert((null != baseUri) && baseUri.IsAbsoluteUri, "baseUri !IsAbsoluteUri");
Debug.Assert(String.IsNullOrEmpty(baseUri.Query) && String.IsNullOrEmpty(baseUri.Fragment), "baseUri has query or fragment");
Util.CheckArgumentNull(requestUri, "requestUri");
// there is a bug in (new Uri(Uri,Uri)) which corrupts the port of the result if out relativeUri is also absolute
if (!requestUri.IsAbsoluteUri)
{
if (baseUri.OriginalString.EndsWith("/", StringComparison.Ordinal))
{
if (requestUri.OriginalString.StartsWith("/", StringComparison.Ordinal))
{
requestUri = new Uri(baseUri, Util.CreateUri(requestUri.OriginalString.TrimStart(Util.ForwardSlash), UriKind.Relative));
}
else
{
requestUri = new Uri(baseUri, requestUri);
}
}
else
{
requestUri = Util.CreateUri(baseUri.OriginalString + "/" + requestUri.OriginalString.TrimStart(Util.ForwardSlash), UriKind.Absolute);
}
}
return requestUri;
}
///
/// does the array contain the value reference
///
/// generic type
/// array to search
/// value being looked for
/// true if value reference was found in array
internal static bool ContainsReference(T[] array, T value) where T : class
{
return (0 <= IndexOfReference(array, value));
}
/// dispose of the object and set the reference to null
/// type that implements IDisposable
/// object to dispose
internal static void Dispose(ref T disposable) where T : class, IDisposable
{
Dispose(disposable);
disposable = null;
}
/// dispose of the object
/// type that implements IDisposable
/// object to dispose
internal static void Dispose(T disposable) where T : class, IDisposable
{
if (null != disposable)
{
disposable.Dispose();
}
}
///
/// index of value reference in the array
///
/// generic type
/// array to search
/// value being looked for
/// index of value reference in the array else (-1)
internal static int IndexOfReference(T[] array, T value) where T : class
{
Debug.Assert(null != array, "null array");
for (int i = 0; i < array.Length; ++i)
{
if (object.ReferenceEquals(array[i], value))
{
return i;
}
}
return -1;
}
/// Checks whether the exception should not be handled.
/// exception to test
/// true if the exception should not be handled
internal static bool DoNotHandleException(Exception ex)
{
return ((null != ex) &&
((ex is System.StackOverflowException) ||
(ex is System.OutOfMemoryException) ||
(ex is System.Threading.ThreadAbortException)));
}
///
/// Checks whether the exception type is one of the DataService*Exception
///
/// exception to test
/// true if the exception type is one of the DataService*Exception
internal static bool IsKnownClientExcption(Exception ex)
{
return (ex is DataServiceClientException) || (ex is DataServiceQueryException) || (ex is DataServiceRequestException);
}
/// validate value is non-null
/// type of value
/// value
/// error code to throw if null
/// the non-null value
internal static T NullCheck(T value, InternalError errorcode) where T : class
{
if (Object.ReferenceEquals(value, null))
{
Error.ThrowInternalError(errorcode);
}
return value;
}
/// are the two values the same reference
/// value1
/// value2
/// true if they are the same reference
internal static bool AreSame(string value1, string value2)
{
// bool result = Object.ReferenceEquals(value1, value2);
// Debug.Assert(result == (value1 == value2), "!NameTable - unable to do reference comparison on '" + value1 + "'");
// XElement uses a global name table which may have encountered
// our strings first and return a different instance than what was expected
bool result = (value1 == value2);
return result;
}
/// is the reader on contentNode where the localName and namespaceUri match
/// reader
/// localName
/// namespaceUri
/// true if localName and namespaceUri match reader current element
internal static bool AreSame(XmlReader reader, string localName, string namespaceUri)
{
Debug.Assert((null != reader) && (null != localName) && (null != namespaceUri), "null");
return ((XmlNodeType.Element == reader.NodeType) || (XmlNodeType.EndElement == reader.NodeType)) &&
AreSame(reader.LocalName, localName) && AreSame(reader.NamespaceURI, namespaceUri);
}
///
/// check the atom:null="true" attribute
///
/// XmlReader
/// true of null is true
internal static bool DoesNullAttributeSayTrue(XmlReader reader)
{
string attributeValue = reader.GetAttribute(XmlConstants.AtomNullAttributeName, XmlConstants.DataWebMetadataNamespace);
return ((null != attributeValue) && XmlConvert.ToBoolean(attributeValue));
}
/// Checks whether the specified
/// Type to check.
/// true if type is a reference type or a Nullable type; false otherwise.
internal static bool TypeAllowsNull(Type type)
{
Debug.Assert(type != null, "type != null");
return !type.IsValueType || IsNullableType(type);
}
/// Gets a type for
/// Type to base resulting type on.
///
///
internal static Type GetTypeAllowingNull(Type type)
{
Debug.Assert(type != null, "type != null");
return TypeAllowsNull(type) ? type : typeof(Nullable<>).MakeGenericType(type);
}
/// Set the continuation for the following results for a collection.
/// The collection to set the links to
/// The continuation for the collection.
internal static void SetNextLinkForCollection(object collection, DataServiceQueryContinuation continuation)
{
Debug.Assert(collection != null, "collection != null");
// We do a convention call for setting Continuation. We'll invoke this
// for all properties named 'Continuation' that is a DataServiceQueryContinuation
// (assigning to a single one would make it inconsistent if reflection
// order is changed).
foreach (var property in collection.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public))
{
if (property.Name != "Continuation" || !property.CanWrite)
{
continue;
}
if (typeof(DataServiceQueryContinuation).IsAssignableFrom(property.PropertyType))
{
property.SetValue(collection, continuation, null);
}
}
}
///
/// Similar to Activator.CreateInstance, but uses LCG to avoid
/// more stringent Reflection security constraints.in Silverlight
///
/// Type to create.
/// Arguments.
/// The newly instantiated object.
internal static object ActivatorCreateInstance(Type type, params object[] arguments)
{
Debug.Assert(type != null, "type != null");
#if ASTORIA_LIGHT
// Look up the constructor
// We don't do overload resolution, make sure that the specific type has only one constructor with specified number of arguments
int argumentCount = (arguments == null) ? 0 : arguments.Length;
ConstructorInfo[] constructors = type.GetConstructors();
ConstructorInfo constructor = null;
for (int i = 0; i < constructors.Length; i++)
{
if (constructors[i].GetParameters().Length == argumentCount)
{
Debug.Assert( constructor == null, "Make sure that the specific type has only one constructor with specified argument count");
constructor = constructors[i];
#if !DEBUG
break;
#endif
}
}
// A constructor should have been found, but we could run into a case with
// complex types where there is no default constructor. A better error
// message can be provided after localization freeze.
if (constructor == null)
{
throw new MissingMethodException();
}
return ConstructorInvoke(constructor, arguments);
#else // ASTORIA_LIGHT
return Activator.CreateInstance(type, arguments);
#endif
}
///
/// Similar to ConstructorInfo.Invoke, but uses LCG to avoid
/// more stringent Reflection security constraints in Silverlight
///
/// Constructor to invoke.
/// Arguments.
/// The newly instantiated object.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining | System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]
internal static object ConstructorInvoke(ConstructorInfo constructor, object[] arguments)
{
if (constructor == null)
{
throw new MissingMethodException();
}
#if ASTORIA_LIGHT
int argumentCount = (arguments == null) ? 0 : arguments.Length;
ParameterExpression argumentsExpression = Expression.Parameter(typeof(object[]), "arguments");
Expression[] argumentExpressions = new Expression[argumentCount];
ParameterInfo[] parameters = constructor.GetParameters();
for (int i = 0; i < argumentExpressions.Length; i++)
{
argumentExpressions[i] = Expression.Constant(arguments[i], parameters[i].ParameterType);
}
Expression newExpression = Expression.New(constructor, argumentExpressions);
Expression> lambda = Expression.Lambda>(
Expression.Convert(newExpression, typeof(object)),
argumentsExpression);
object result = lambda.Compile()(arguments);
return result;
#else
return constructor.Invoke(arguments);
#endif
}
#region Tracing
///
/// trace Element node
///
/// XmlReader
/// TextWriter
[Conditional("TRACE")]
internal static void TraceElement(XmlReader reader, System.IO.TextWriter writer)
{
Debug.Assert(XmlNodeType.Element == reader.NodeType, "not positioned on Element");
if (null != writer)
{
writer.Write(Util.GetWhitespaceForTracing(2 + reader.Depth), 0, 2 + reader.Depth);
writer.Write("<{0}", reader.Name);
if (reader.MoveToFirstAttribute())
{
do
{
writer.Write(" {0}=\"{1}\"", reader.Name, reader.Value);
}
while (reader.MoveToNextAttribute());
reader.MoveToElement();
}
writer.Write(reader.IsEmptyElement ? " />" : ">");
}
}
///
/// trace EndElement node
///
/// XmlReader
/// TextWriter
/// indent or not
[Conditional("TRACE")]
internal static void TraceEndElement(XmlReader reader, System.IO.TextWriter writer, bool indent)
{
if (null != writer)
{
if (indent)
{
writer.Write(Util.GetWhitespaceForTracing(2 + reader.Depth), 0, 2 + reader.Depth);
}
writer.Write("", reader.Name);
}
}
///
/// trace string value
///
/// TextWriter
/// value
[Conditional("TRACE")]
internal static void TraceText(System.IO.TextWriter writer, string value)
{
if (null != writer)
{
writer.Write(value);
}
}
#endregion
/// Checks whether the specified type is a generic nullable type.
/// Type to check.
/// true if
private static bool IsNullableType(Type type)
{
return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- EntitySqlQueryState.cs
- XmlSubtreeReader.cs
- SByteStorage.cs
- TrackBarRenderer.cs
- TextStore.cs
- DataGridTextColumn.cs
- SelectedCellsCollection.cs
- CodeConditionStatement.cs
- XmlEntityReference.cs
- DeviceSpecific.cs
- ResourceSet.cs
- SQLDouble.cs
- CompilationUnit.cs
- HtmlWindow.cs
- CalendarDateRangeChangingEventArgs.cs
- SmtpFailedRecipientException.cs
- UpDownEvent.cs
- TimeoutConverter.cs
- CheckBoxField.cs
- HtmlInputSubmit.cs
- BitmapEffectRenderDataResource.cs
- Metafile.cs
- InvokeBinder.cs
- TrustManagerMoreInformation.cs
- ChangeTracker.cs
- InstanceContextMode.cs
- EncoderNLS.cs
- WindowsRichEditRange.cs
- Base64Decoder.cs
- WebGetAttribute.cs
- ObjectSelectorEditor.cs
- SqlCacheDependencySection.cs
- ListItemParagraph.cs
- DurableDispatcherAddressingFault.cs
- XmlNode.cs
- StylusTouchDevice.cs
- UITypeEditors.cs
- ChineseLunisolarCalendar.cs
- KeyedCollection.cs
- HttpConfigurationSystem.cs
- BinaryFormatterSinks.cs
- UndirectedGraph.cs
- DictionarySectionHandler.cs
- ConfigXmlText.cs
- MailBnfHelper.cs
- InvokerUtil.cs
- XPathPatternBuilder.cs
- SelectorAutomationPeer.cs
- BaseTreeIterator.cs
- DataGridViewCellStateChangedEventArgs.cs
- ScrollBarRenderer.cs
- MenuRendererClassic.cs
- DockAndAnchorLayout.cs
- ReachFixedPageSerializerAsync.cs
- Renderer.cs
- LocalizationComments.cs
- OdbcTransaction.cs
- FormViewModeEventArgs.cs
- PerformanceCounterLib.cs
- KeyboardInputProviderAcquireFocusEventArgs.cs
- GB18030Encoding.cs
- Assert.cs
- DSASignatureFormatter.cs
- AssemblyNameUtility.cs
- SoapObjectWriter.cs
- CodeObjectCreateExpression.cs
- GeometryDrawing.cs
- ScriptRegistrationManager.cs
- MimeParameters.cs
- DetailsViewDeleteEventArgs.cs
- XsdBuilder.cs
- RC2CryptoServiceProvider.cs
- PopOutPanel.cs
- SerializationAttributes.cs
- OdbcConnectionHandle.cs
- IArgumentProvider.cs
- WinFormsUtils.cs
- RelatedView.cs
- CommonDialog.cs
- HtmlInputControl.cs
- PropertyInformationCollection.cs
- DecimalConstantAttribute.cs
- URLEditor.cs
- GenericsInstances.cs
- CryptoConfig.cs
- ReferenceConverter.cs
- SystemResourceHost.cs
- MetabaseServerConfig.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- TextBoxBase.cs
- AddingNewEventArgs.cs
- BinaryEditor.cs
- UnSafeCharBuffer.cs
- SpellCheck.cs
- XmlSerializableReader.cs
- wgx_sdk_version.cs
- ObjectTag.cs
- ComponentDispatcher.cs
- XmlNamedNodeMap.cs
- MailDefinition.cs