public object GetChanges()
{
var changes = _values
.Select(pair =>
{
var value = pair.Value;
object snapshot;
if (_snapshot.TryGetValue(pair.Key, out snapshot) && Equals(value, snapshot))
{
var tracking = value as IChangeTracking;
if (tracking == null)
{
return(null);
}
value = tracking.GetChanges();
if (value == null)
{
return(null);
}
}
return(new { pair.Key, value });
})
.Where(item => item != null)
.ToDictionary(item => item.Key, item => item.value);
if (changes.Count == 0)
{
return(null);
}
var resource = new SDataResource(changes);
((ISDataProtocolObject)resource).Info = _info;
return(resource);
}
private SDataRequest CreateBatchRequest(ICollection <SDataParameters> items)
{
Guard.ArgumentNotNull(items, "items");
var resources = new SDataCollection <SDataResource>(items.Count);
string path = null;
MediaType?contentType = null;
var include = new List <string>();
var select = new List <string>();
int? precedence = null;
MediaType?format = null;
string language = null;
string version = null;
var accept = new List <MediaType>();
var form = new Dictionary <string, string>();
var files = new List <AttachedFile>();
var extensionArgs = new Dictionary <string, string>();
foreach (var parms in items)
{
if (parms.StartIndex != null)
{
throw new NotSupportedException("StartIndex not supported in batch requests");
}
if (parms.Count != null)
{
throw new NotSupportedException("Count not supported in batch requests");
}
if (parms.Where != null)
{
throw new NotSupportedException("Where not supported in batch requests");
}
if (parms.OrderBy != null)
{
throw new NotSupportedException("OrderBy not supported in batch requests");
}
if (parms.Search != null)
{
throw new NotSupportedException("Search not supported in batch requests");
}
if (parms.TrackingId != null)
{
throw new NotSupportedException("TrackingId not supported in batch requests");
}
if (parms.IncludeSchema != null)
{
throw new NotSupportedException("IncludeSchema not supported in batch requests");
}
if (parms.ReturnDelta != null)
{
throw new NotSupportedException("ReturnDelta not supported in batch requests");
}
if (parms.Path != path)
{
if (path != null)
{
throw new SDataClientException("All non-null path values must be the same");
}
path = parms.Path;
}
if (parms.ContentType != contentType)
{
if (contentType != null)
{
throw new SDataClientException("All non-null content type values must be the same");
}
contentType = parms.ContentType;
}
if (parms.Include != null)
{
include.AddRange(parms.Include.Split(','));
}
if (parms.Select != null)
{
select.AddRange(parms.Select.Split(','));
}
if (parms.Precedence != null && parms.Precedence != precedence)
{
precedence = Math.Max(precedence ?? 0, parms.Precedence.Value);
}
if (parms.Format != format)
{
if (format != null)
{
throw new SDataClientException("All non-null format values must be the same");
}
format = parms.Format;
}
if (parms.Language != language)
{
if (language != null)
{
throw new SDataClientException("All non-null language values must be the same");
}
language = parms.Language;
}
if (parms.Version != version)
{
if (version != null)
{
throw new SDataClientException("All non-null version values must be the same");
}
version = parms.Version;
}
if (parms.Accept != null)
{
accept.AddRange(parms.Accept);
}
foreach (var data in parms.Form)
{
form.Add(data.Key, data.Value);
}
files.AddRange(parms.Files);
foreach (var arg in parms.ExtensionArgs)
{
extensionArgs[arg.Key] = arg.Value;
}
SDataResource resource;
if (parms.Content == null)
{
resource = new SDataResource();
}
else
{
var content = parms.Content;
if (parms.Method == HttpMethod.Put && DifferentialUpdate)
{
var tracking = content as IChangeTracking;
if (tracking != null)
{
content = tracking.GetChanges();
if (content == null)
{
throw new SDataClientException("Content doesn't have any changes");
}
}
}
resource = ContentHelper.Serialize(content, NamingScheme) as SDataResource;
if (resource == null)
{
throw new SDataClientException("Only resources can be submitted in batch requests");
}
}
resource.HttpMethod = parms.Method;
if (parms.Method != HttpMethod.Post)
{
if (resource.Key == null)
{
throw new SDataClientException("A selector must be specified for GET, PUT and DELETE batch requests");
}
var itemUri = new SDataUri(Uri)
{
Include = parms.Include,
Select = parms.Select,
Precedence = parms.Precedence
};
if (path != null)
{
itemUri.AppendPath(path);
}
itemUri.LastPathSegment.Selector = SDataUri.FormatConstant(resource.Key);
resource.Id = itemUri.AbsoluteUri;
resource.Url = itemUri.Uri;
}
if (parms.ETag != null)
{
resource.IfMatch = parms.ETag;
}
resources.Add(resource);
}
var uri = new SDataUri(Uri)
{
Precedence = precedence,
Format = format ?? Format,
Language = language ?? Language,
Version = version ?? Version
};
if (path != null)
{
uri.AppendPath(path);
}
uri.AppendPath("$batch");
if (include.Count > 0)
{
uri.Include = string.Join(",", include.Distinct().ToArray());
}
if (select.Count > 0)
{
uri.Select = string.Join(",", select.Distinct().ToArray());
}
foreach (var arg in extensionArgs)
{
uri["_" + arg.Key] = arg.Value;
}
var request = CreateRequest(uri, HttpMethod.Post, resources);
request.ContentType = contentType ?? Format;
if (accept.Count > 0)
{
request.Accept = accept.Distinct().ToArray();
}
foreach (var data in form)
{
request.Form.Add(data.Key, data.Value);
}
foreach (var file in files)
{
request.Files.Add(file);
}
if (language != null)
{
request.AcceptLanguage = language ?? Language;
}
TraceRequest(request);
return(request);
}
private static T GetServiceResult <T>(ISDataClient client, Expression bodyExpr, SDataResource content)
{
var value = content["response"];
var response = (SDataResource)value;
var attr = ((MethodCallExpression)bodyExpr).Method.GetCustomAttribute <SDataServiceOperationAttribute>();
if (attr != null && !string.IsNullOrEmpty(attr.ResultPropertyName))
{
value = response[attr.ResultPropertyName];
}
else if (response.Count == 1)
{
var firstValue = response.Values.First();
var type = typeof(T);
type = Nullable.GetUnderlyingType(type) ?? type;
if (ContentHelper.IsObject(type) == ContentHelper.IsObject(firstValue))
{
value = firstValue;
}
}
var result = ContentHelper.Deserialize <T>(value, client.NamingScheme);
var tracking = result as IChangeTracking;
if (tracking != null)
{
tracking.AcceptChanges();
}
return(result);
}
private static SDataParameters GetServiceParameters(ISDataClient client, Expression bodyExpr, string path)
{
Guard.ArgumentNotNull(client, "client");
var callExpr = bodyExpr as MethodCallExpression;
if (callExpr == null)
{
throw new SDataClientException("Expression must be a method call");
}
var attr = callExpr.Method.GetCustomAttribute <SDataServiceOperationAttribute>();
var namingScheme = client.NamingScheme ?? NamingScheme.Default;
var request = new SDataResource();
var instance = callExpr.Object != null?Expression.Lambda(callExpr.Object).Compile().DynamicInvoke() : null;
if (path == null)
{
path = SDataPathAttribute.GetPath(instance != null ? instance.GetType() : callExpr.Method.DeclaringType);
}
if (instance != null)
{
if (attr == null || attr.PassInstanceBy == InstancePassingConvention.Selector ||
(attr.PassInstanceBy == InstancePassingConvention.Default && string.IsNullOrEmpty(attr.InstancePropertyName)))
{
if (path == null)
{
throw new SDataClientException("Path must be specified when passing instance context by selector");
}
var key = ContentHelper.GetProtocolValue <string>(instance, SDataProtocolProperty.Key);
if (string.IsNullOrEmpty(key))
{
throw new SDataClientException("Unable to extract resource key from instance");
}
path += string.Format("({0})", SDataUri.FormatConstant(key));
}
else if (attr.PassInstanceBy == InstancePassingConvention.Default)
{
var key = ContentHelper.GetProtocolValue <string>(instance, SDataProtocolProperty.Key);
request[attr.InstancePropertyName] = !string.IsNullOrEmpty(key) ? key : instance;
}
else
{
if (string.IsNullOrEmpty(attr.InstancePropertyName))
{
throw new SDataClientException("Instance property name must be specified when passing instance context by key property or object property");
}
if (attr.PassInstanceBy == InstancePassingConvention.KeyProperty)
{
var key = ContentHelper.GetProtocolValue <string>(instance, SDataProtocolProperty.Key);
if (string.IsNullOrEmpty(key))
{
throw new SDataClientException("Unable to extract resource key from instance");
}
request[attr.InstancePropertyName] = key;
}
else if (attr.PassInstanceBy == InstancePassingConvention.ObjectProperty)
{
request[attr.InstancePropertyName] = instance;
}
}
}
if (path != null)
{
path += "/";
}
path += "$service/" + namingScheme.GetName(callExpr.Method);
foreach (var pair in callExpr.Method.GetParameters().Zip(callExpr.Arguments, (param, arg) => new { param, arg }))
{
request[namingScheme.GetName(pair.param)] = Expression.Lambda(pair.arg).Compile().DynamicInvoke();
}
var xmlLocalName = attr != null ? attr.XmlLocalName : null;
var xmlNamespace = attr != null ? attr.XmlNamespace : null;
var content = new SDataResource(xmlLocalName, xmlNamespace)
{
{ "request", request }
};
return(new SDataParameters
{
Method = HttpMethod.Post,
Path = path,
Content = content
});
}
public ResourceCustomTypeDescriptor(SDataResource instance)
{
_instance = instance;
}