/// <summary>
/// </summary>
/// <param name="filterCriteria"></param>
/// <returns></returns>
public virtual IPluralRulesEnumerable Query(PluralRuleInfo filterCriteria)
{
if (filterCriteria.Equals(PluralRuleInfo.Empty))
{
return(this);
}
int c = 0;
foreach (var rule in this)
{
if (filterCriteria.FilterMatch(rule.Info))
{
c++;
}
}
IPluralRule[] result = new IPluralRule[c];
int i = 0;
foreach (var rule in this)
{
if (filterCriteria.FilterMatch(rule.Info))
{
result[i++] = rule;
}
}
return(new PluralRulesArray(result));
}
/// <summary>
/// Filter rules by <paramref name="filterCriteria"/>.
/// </summary>
/// <param name="filterCriteria"></param>
/// <returns><see cref="PluralRulesCasesEvaluatable"/> or <see cref="PluralRulesArray"/>, or null if content is empty</returns>
public IPluralRulesEnumerable Query(PluralRuleInfo filterCriteria)
{
// Try get
IPluralRulesEnumerable result = null;
lock (m_lock) if (queries.TryGetValue(filterCriteria, out result))
{
return(result);
}
// Query
if (ruleSource is IPluralRulesQueryable queryable)
{
result = queryable.Query(filterCriteria);
// Wrap into PluralRulesEvaluatable
if (result != null && filterCriteria.Category != null && filterCriteria.Culture != null && filterCriteria.Case == null && filterCriteria.Optional == -1)
{
result = new PluralRulesCasesEvaluatable(result);
}
}
else if (ruleSource is IEnumerable <IPluralRule> enumr)
{
// Filter rules
StructList8 <IPluralRule> list = new StructList8 <IPluralRule>();
StructList8 <string> rulesets = new StructList8 <string>();
foreach (IPluralRule rule in enumr)
{
// Filter by criteria
if (!filterCriteria.FilterMatch(rule.Info))
{
continue;
}
// Gather a list of rulesets
if (rule.Info.RuleSet != null && !rulesets.Contains(rule.Info.RuleSet))
{
rulesets.Add(rule.Info.RuleSet);
}
// Add to list
list.Add(rule);
}
// No result
if (list.Count == 0)
{
result = null;
}
// Instantiate PluralRulesEvaluatable
else if (rulesets.Count <= 1 && filterCriteria.Category != null && filterCriteria.Culture != null && filterCriteria.Case == null && filterCriteria.Optional == -1)
{
result = new PluralRulesCasesEvaluatable(list.ToArray());
}
// Instantiate PluralRules.
else
{
result = new PluralRulesArray(list.ToArray());
}
}
// Could not read source
else
{
result = null;
}
// Write to cache, if is still new
lock (m_lock) if (!queries.ContainsKey(filterCriteria))
{
queries[filterCriteria] = result;
}
// Return result
return(result);
}