public void Test_IsInPage_PageSize1_In()
{
using (LogGroup logGroup = LogGroup.Start("Testing the IsInPage function with a page size of 1 on an item that appears on the specified page.", LogLevel.Debug))
{
int i = 1;
int pageIndex = 1;
int pageSize = 1;
PagingLocation location = new PagingLocation(pageIndex, pageSize);
bool isInPage = location.IsInPage(i);
Assert.IsTrue(isInPage, "Returned false when it should have been true.");
}
}
protected virtual IEntity[] GetPage(IObjectSet objectSet, PagingLocation location)
{
int i = 0;
List <IEntity> list = new List <IEntity>();
// Loop through each index in the object set
for (i = 0; i < objectSet.Count; i++)
{
// If it's not in the current page then skip it
if (location.IsInPage(i))
{
// Add the entity to the collection
list.Add((IEntity)objectSet[i]);
}
}
location.AbsoluteTotal = i;
return(list.ToArray());
}
public void Test_IsInPage_PageSize1_In()
{
using (LogGroup logGroup = LogGroup.Start("Testing the IsInPage function with a page size of 1 on an item that appears on the specified page.", LogLevel.Debug))
{
int i = 1;
int pageIndex = 1;
int pageSize = 1;
PagingLocation location = new PagingLocation(pageIndex, pageSize);
bool isInPage = location.IsInPage(i);
Assert.IsTrue(isInPage, "Returned false when it should have been true.");
}
}
/// <summary>
/// Retrieves a single page (at the specified location) of the specified type of entities from the corresponding data store.
/// </summary>
/// <param name="type">The type of entities to retrieve.</param>
/// <param name="location">The coordinates of the page being retrieved.</param>
/// <param name="sortExpression">The sort expression to apply before retrieving the page.</param>
/// <returns>An array of the entities, including only the current page.</returns>
public override IEntity[] GetPageOfEntities(Type type, PagingLocation location, string sortExpression)
{
// Create the collection
List <IEntity> entities = new List <IEntity>();
using (LogGroup logGroup = LogGroup.Start("Retrieving a page of entities.", NLog.LogLevel.Debug))
{
if (type == null)
{
throw new ArgumentNullException("type");
}
if (location == null)
{
throw new ArgumentNullException("location");
}
// Output the parameters to the log
LogWriter.Debug("Type: " + type.ToString());
LogWriter.Debug("Page index: " + location.PageIndex);
LogWriter.Debug("Page size: " + location.PageSize);
LogWriter.Debug("Sort expression: " + sortExpression);
// Get the corresponding data store
Db4oDataStore store = (Db4oDataStore)GetDataStore(type);
if (store == null)
{
throw new Exception("Can't find data store.");
}
if (store.ObjectContainer == null)
{
throw new Exception("store.ObjectContainer is null");
}
// Create the query object
IQuery query = store.ObjectContainer.Query();
// Constrain the query to the specified type
query.Constrain(type);
// Apply the sorting to the query
ApplySorting(query, type, sortExpression);
// Execute the query and get the object set
IObjectSet os = query.Execute();
if (os == null)
{
throw new Exception("IObjectSet is null");
}
int i = 0;
// Loop through each index in the object set
for (i = 0; i < os.Count; i++)
{
// ONLY execute during debug because it slows the indexing down
if (new ModeDetector().IsDebug)
{
LogWriter.Debug("At absolute position " + i + ": " + ((IEntity)os[i]).ToString());
}
// If it's not in the current page then skip it
if (location.IsInPage(i))
{
// Add the entity to the collection
entities.Add((IEntity)os[i]);
}
}
// Set the absolute total to the paging location
// This is the total count including items on ALL pages, not just the current one
location.AbsoluteTotal = i;
LogWriter.Debug("Absolute count: " + location.AbsoluteTotal.ToString());
LogWriter.Debug("Entities count (single page): " + entities.Count.ToString());
}
// Return the entities
return(Release(entities.ToArray()));
}