/// <summary> /// Gets the tags that match the specified filter. /// </summary> /// <param name="identity">The identity of the caller.</param> /// <param name="filter">The tag search filter.</param> /// <param name="cancellationToken">The cancellation token for the request.</param> /// <returns> /// A collection of matching tags. /// </returns> protected abstract Task <IEnumerable <TagDefinition> > FindTags(ClaimsPrincipal identity, TagDefinitionFilter filter, CancellationToken cancellationToken);
/// <summary>
/// Gets the tags that match the specified filter.
/// </summary>
/// <param name="identity">The identity of the caller.</param>
/// <param name="filter">The tag search filter.</param>
/// <param name="cancellationToken">The cancellation token for the request.</param>
/// <returns>
/// A collection of matching tags.
/// </returns>
protected override Task <IEnumerable <TagDefinition> > FindTags(ClaimsPrincipal identity, TagDefinitionFilter filter, CancellationToken cancellationToken)
{
IEnumerable <TagDefinition> allTags = _tags.Values;
var result = filter.FilterType == TagDefinitionFilterJoinType.And
? (IEnumerable <TagDefinition>)_tags.Values
: new TagDefinition[0];
foreach (var clause in filter.FilterClauses)
{
switch (clause.Field)
{
case TagDefinitionFilterField.Name:
if (filter.FilterType == TagDefinitionFilterJoinType.And)
{
result = result.Where(x => x.Name.Like(clause.Value));
}
else
{
result = result.Concat(allTags.Where(x => x.Name.Like(clause.Value)));
}
break;
case TagDefinitionFilterField.Description:
if (filter.FilterType == TagDefinitionFilterJoinType.And)
{
result = result.Where(x => x.Description?.Like(clause.Value) ?? false);
}
else
{
result = result.Concat(allTags.Where(x => x.Description?.Like(clause.Value) ?? false));
}
break;
case TagDefinitionFilterField.Units:
if (filter.FilterType == TagDefinitionFilterJoinType.And)
{
result = result.Where(x => x.Units?.Like(clause.Value) ?? false);
}
else
{
result = result.Concat(allTags.Where(x => x.Units?.Like(clause.Value) ?? false));
}
break;
}
}
if (filter.FilterType == TagDefinitionFilterJoinType.Or)
{
result = result.Distinct();
}
return(Task.FromResult <IEnumerable <TagDefinition> >(result.OrderBy(x => x.Name, StringComparer.OrdinalIgnoreCase).Skip((filter.Page - 1) * filter.PageSize).Take(filter.PageSize).ToArray()));
}
/// <summary>
/// Gets the tags that match the specified filter.
/// </summary>
/// <param name="identity">The identity of the caller.</param>
/// <param name="filter">The tag search filter.</param>
/// <param name="cancellationToken">The cancellation token for the request.</param>
/// <returns>
/// A collection of matching tags.
/// </returns>
async Task <IEnumerable <TagDefinition> > IHistorian.FindTags(ClaimsPrincipal identity, TagDefinitionFilter filter, CancellationToken cancellationToken)
{
ThrowIfDisposed();
return(await FindTags(identity, filter, cancellationToken).ConfigureAwait(false));
}
