/// <summary>Finds all the entities that match the expression.</summary>
/// <param name="expression">The search-specification.</param>
/// <param name="sortRules">The specification of the sort rules that must be applied. Use <see langword="null"/> to ignore the ordering.</param>
/// <param name="maximumResults">The maximum number of results that must be retrieved. Use '-1' to retrieve all results.</param>
/// <param name="includePaths">The dot-separated lists of related objects to return in the query results.</param>
/// <param name="dataSourceInfo">The parameter is not used.</param>
/// <returns>The items that match the expression.</returns>
protected override IEnumerable <TEntity> FindAllCore(Func <TEntity, bool> expression,
SortSpecifications <TEntity> sortRules, int maximumResults, string[] includePaths, DataSourceInfo dataSourceInfo)
{
MemoryStore <TEntity> memoryStore = this.SelectMemoryStore(dataSourceInfo);
try {
this.temporaryStorageLock.EnterReadLock();
memoryStore.EnterReadLock();
IEnumerable <TEntity> results = this.ConcatStorage(dataSourceInfo);
results = results.Where(item => expression(item)).OrderBy(sortRules);
if (maximumResults == -1)
{
return(results.ToList());
}
else
{
return(results.Take(maximumResults).ToList());
}
}
finally {
memoryStore.ExitReadLock();
this.temporaryStorageLock.ExitReadLock();
}
}
/// <summary>Sorts the sequence according to the sort specifications.</summary>
/// <typeparam name="T">The type of object that must be sorted.</typeparam>
/// <param name="source">The sequence that must be sorted.</param>
/// <param name="sortSpecifications">The specifications for the sorting.</param>
/// <returns>The sorted sequence.</returns>
public static IEnumerable <T> OrderBy <T>(this IEnumerable <T> source, SortSpecifications <T> sortSpecifications)
{
Guard.ArgumentIsNotNull(source, nameof(source), "The IEnumerable instance is mandatory.");
if (sortSpecifications == null)
{
return(source);
}
else
{
return(sortSpecifications.Sort(source));
}
}
/// <summary>Finds the first entity that matches the expression or returns the default value if there were no matches.</summary>
/// <param name="expression">The search-specification.</param>
/// <param name="sortRules">The specification of the sort rules that must be applied. Use <see langword="null"/> to ignore the ordering.</param>
/// <param name="includePaths">The dot-separated lists of related objects to return in the query results.</param>
/// <param name="dataSourceInfo">The parameter is not used.</param>
/// <param name="defaultValue">The value that must be returned if there were no matches.</param>
/// <returns>The first result or the default value.</returns>
protected override TEntity FindFirstCore(Func <TEntity, bool> expression, SortSpecifications <TEntity> sortRules, string[] includePaths, DataSourceInfo dataSourceInfo,
TEntity defaultValue)
{
MemoryStore <TEntity> memoryStore = this.SelectMemoryStore(dataSourceInfo);
try {
this.temporaryStorageLock.EnterReadLock();
memoryStore.EnterReadLock();
return(this.ConcatStorage(dataSourceInfo).OrderBy(sortRules).FirstOrDefault(expression, defaultValue));
}
finally {
memoryStore.ExitReadLock();
if (this.temporaryStorageLock.IsReadLockHeld)
{
this.temporaryStorageLock.ExitReadLock();
}
}
}
/// <summary>Since retrieval of the entity is handled by the parent entity's repository, this method throws a
/// <see cref="NotSupportedException"/>.</summary>
/// <param name="expression">The parameter is not used.</param>
/// <param name="sortRules">The specification of the sort rules that must be applied. Use <see langword="null"/> to ignore the ordering.</param>
/// <param name="includePaths">The dot-separated lists of related objects to return in the query results.</param>
/// <param name="dataSourceInfo">Information about the data source that may not have been set at an earlier stage.</param>
/// <param name="defaultValue">The parameter is not used.</param>
/// <returns>Not applicable.</returns>
/// <exception cref="NotSupportedException">Always, since this operation is not supported by this type of repository.</exception>
protected override TEntity FindFirstCore(Func <TEntity, bool> expression, SortSpecifications <TEntity> sortRules, string[] includePaths, DataSourceInfo dataSourceInfo,
TEntity defaultValue)
{
throw new NotSupportedException("This repository cannot be used to retrieve entities.");
}
/// <summary>Since retrieval of these entities is handled by the parent entity's repository, this method throws a
/// <see cref="NotSupportedException"/>.</summary>
/// <param name="expression">The parameter is not used.</param>
/// <param name="sortRules">The specification of the sort rules that must be applied. Use <see langword="null"/> to ignore the ordering.</param>
/// <param name="maximumResults">The maximum number of results that must be retrieved. Use '-1' to retrieve all results.</param>
/// <param name="includePaths">The dot-separated lists of related objects to return in the query results.</param>
/// <param name="dataSourceInfo">Information about the data source that may not have been set at an earlier stage.</param>
/// <returns>Not applicable.</returns>
/// <exception cref="NotSupportedException">Always, since this operation is not supported by this type of repository.</exception>
protected override IEnumerable <TEntity> FindAllCore(Func <TEntity, bool> expression, SortSpecifications <TEntity> sortRules, int maximumResults,
string[] includePaths, DataSourceInfo dataSourceInfo)
{
throw new NotSupportedException("This repository cannot be used to retrieve entities.");
}
