/// <summary>
/// Creates string of tags related to resource
/// </summary>
/// <param name="metadata">the associated metadata</param>
/// <param name="resource"> core.resource </param>
private static void AddResourceTags(XElement metadata, ScholarlyWorks.ScholarlyWorkItem resource)
{
if (null == metadata || null == resource)
{
return;
}
resource.Tags.ToList().ForEach(delegate(ScholarlyWorks.Tag tag)
{
if (!String.IsNullOrEmpty(tag.Name))
{
metadata.Add(MetadataProviderHelper.GetElement(MetadataProviderHelper.Metadata_Subject, tag.Name));
}
});
}
/// <summary>
/// Generates record element for ListRecord verb
/// </summary>
/// <param name="resourceList"> list of resources </param>
/// <returns> an instance of XElement </returns>
internal XElement GetRecordElement(List <Core.Resource> resourceList)
{
if (null == resourceList || resourceList.Count <= 0)
{
throw new ArgumentException(MetadataProviderHelper.Error_Message_NoRecords, "resourceList");
}
XElement listRecords = null;
listRecords = new XElement(Verb_ListRecords);
foreach (Core.Resource resource in resourceList)
{
XElement record = new XElement(Record);
record.Add(this.GetHeaderElement(resource));
record.Add(MetadataProviderHelper.GetMetadataElement(resource));
listRecords.Add(record);
}
return(listRecords);
}
/// <summary>
/// Creates header element
/// </summary>
/// <param name="resource"> resource object</param>
/// <returns> instance of XElement </returns>
internal XElement GetHeaderElement(Core.Resource resource)
{
XElement header = null;
header = new XElement(Header);
header.Add(MetadataProviderHelper.GetElement(Header_Identifier, resource.Id.ToString()));
header.Add(MetadataProviderHelper.GetElement(Header_DateStamp, resource.DateModified.Value.ToString(MetadataProviderHelper.DateTimeGranularity, CultureInfo.InvariantCulture)));
ResourceType resourceTypeInfo = new CoreHelper(entityConnectionString).GetResourceType(resource);
if (resourceTypeInfo != null)
{
List <string> listOfResourceTypeInfo = new CoreHelper(entityConnectionString).GetResourceTypeHierarchy(resourceTypeInfo);
listOfResourceTypeInfo.ForEach(delegate(string resourceType)
{
header.Add(MetadataProviderHelper.GetElement(Header_SetSpec, resourceType));
});
}
return(header);
}
/// <summary>
/// Creates metadata element
/// </summary>
/// <param name="resource"> resource object </param>
/// <returns> an instance of XElement </returns>
internal static XElement GetMetadataElement(Core.Resource resource)
{
XElement metadata = null;
metadata = new XElement(Metadata);
if (!String.IsNullOrEmpty(resource.Title))
{
metadata.Add(MetadataProviderHelper.GetElement(Metadata_Title, resource.Title));
}
ScholarlyWorks.ScholarlyWork scholarlyWorks = resource as ScholarlyWorks.ScholarlyWork;
if (null != scholarlyWorks)
{
if (scholarlyWorks.Authors != null)
{
MetadataProviderHelper.AddResourceAuthors(metadata, scholarlyWorks);
}
if (scholarlyWorks.Contributors != null)
{
MetadataProviderHelper.AddResourceContributors(metadata, scholarlyWorks);
}
}
// TODO : 2.Currently Tags for a given resource are retrieved without
// checking any relationships, but the implementation needs to be changed if required
ScholarlyWorks.ScholarlyWorkItem scholarlyWorkItem = resource as ScholarlyWorks.ScholarlyWorkItem;
if (scholarlyWorkItem != null && scholarlyWorkItem.Tags != null)
{
MetadataProviderHelper.AddResourceTags(metadata, scholarlyWorkItem);
}
metadata.Add(MetadataProviderHelper.GetElement(Metadata_Description, resource.Description));
if (!String.IsNullOrEmpty(resource.DateModified.Value.ToString()))
{
metadata.Add(MetadataProviderHelper.GetElement(Metadata_Date, resource.DateModified.Value.ToString(DateTimeGranularity, CultureInfo.InvariantCulture)));
}
return(metadata);
}
/// <summary>
/// retrieves contributors of resource and adds them to the associated metadata element
/// </summary>
/// <param name="metadata">the associated metadata</param>
/// <param name="scholarlyWorks">scholarlyWorks object whose contributors to be retrieved</param>
private static void AddResourceContributors(XElement metadata, ScholarlyWorks.ScholarlyWork scholarlyWorks)
{
if (null == metadata || null == scholarlyWorks)
{
return;
}
scholarlyWorks.Contributors.ToList().ForEach(delegate(ScholarlyWorks.Contact contact)
{
ScholarlyWorks.Person person = contact as ScholarlyWorks.Person;
string personDetails = string.Empty;
if (null != person)
{
personDetails = CoreHelper.GetCompleteName(person.FirstName, person.MiddleName, person.LastName);
//In case if any other details are to be added then they can be added here
}
if (!string.IsNullOrEmpty(personDetails))
{
metadata.Add(MetadataProviderHelper.GetElement(MetadataProviderHelper.Metadata_Contributor, personDetails));
}
});
}
/// <summary>
/// Calculates pending records
/// </summary>
/// <param name="totalRecords">complete list size</param>
/// <returns>returns pending records count</returns>
internal static int GetPendingRecords(int totalRecords)
{
return(MetadataProviderHelper.GetRecordsCount(totalRecords, PlatformSettings.MaximumHarvestCount));
}
private List <Core.Resource> GetResourceList <T>(
Hashtable queryParams,
DateTime initialQueryExecutionTime,
bool isListRecords,
bool isResumptionTokenSpecified,
MetadataProviderHelper.TokenDetails token) where T : Core.Resource
{
List <Core.Resource> listOfResources = new List <Core.Resource>();
IQueryable <T> resourceQuery = null;
// 1) Build the query
DateTime from = DateTime.MinValue;
DateTime until = DateTime.MinValue;
if (queryParams.ContainsKey("from"))
{
from = ValidateDate(queryParams["from"], false);
}
if (queryParams.ContainsKey("until"))
{
until = ValidateDate(queryParams["until"], true);
}
using (Core.ZentityContext context = CoreHelper.CreateZentityContext())
{
AuthenticatedToken authenticatedToken = GetAuthenticationToken();
if (from != DateTime.MinValue)
{
if ((until != DateTime.MinValue))
{
if (from > until)
{
throw new ArgumentException(MetadataProviderHelper.Error_Message_Invalid_QueryParams, "queryParams");
}
resourceQuery = FilterQuery(context).OfType <T>().
Where(resource =>
resource.DateModified >= from &&
resource.DateModified <= until &&
resource.DateModified < initialQueryExecutionTime)
.Authorize("Read", context, authenticatedToken)
.OrderByDescending(resource => resource.DateModified);
}
else
{
resourceQuery = FilterQuery(context).OfType <T>().
Where(resource =>
resource.DateModified >= from &&
resource.DateModified < initialQueryExecutionTime)
.Authorize("Read", context, authenticatedToken)
.OrderByDescending(resource => resource.DateModified);
}
}
else
{
resourceQuery = FilterQuery(context).OfType <T>().
Where(resource =>
resource.DateModified < initialQueryExecutionTime)
.Authorize("Read", context, authenticatedToken)
.OrderByDescending(resource => resource.DateModified);
}
// 2) Retrieve resources count
this.totalResourceCount = this.actualRecordCount = resourceQuery.Count();
if (this.totalResourceCount <= 0)
{
throw new ArgumentException(MetadataProviderHelper.Error_Message_NoRecords,
"queryParams");
}
if (!isResumptionTokenSpecified)
{
// 3) If count greater than maxharvestcount then
// retrieve resources according to harvest count
// else
// retrieve resources according to original count
if (MetadataProviderHelper.IsResumptionRequired(this.totalResourceCount))
{
listOfResources = CoreHelper.FilterResources <T>(
resourceQuery.Take(PlatformSettings.MaximumHarvestCount),
isListRecords);
this.actualHarvestedCount = listOfResources.Count;
}
else
{
listOfResources = CoreHelper.FilterResources <T>(resourceQuery, isListRecords);
}
}
else
{
// 4) retrieve pending resources i.e : according to maximum harvest count
int noOfRecordsToSkip = token.ActualHarvestedRecords;
listOfResources = CoreHelper.FilterResources <T>(resourceQuery.
Skip(noOfRecordsToSkip).
Take(PlatformSettings.MaximumHarvestCount), isListRecords);
this.actualHarvestedCount = noOfRecordsToSkip + listOfResources.Count;
}
}
return(listOfResources);
}
