/// <summary>
/// Clear caches maintained by this service. Subclasses can
/// override if they implement additional that need to be cleared
/// when the service changes. Subclasses should generally not call
/// this method directly, as it must only be called while
/// synchronized on this.
/// </summary>
protected virtual void ClearCaches()
{
// we don't synchronize on these because methods that use them
// copy before use, and check for changes if they modify the
// caches.
cache = null;
idcache = null;
dnref = null;
}
/// <summary>
/// Return a snapshot of the mapping from display names to visible
/// IDs for this service. This set will not change as factories
/// are added or removed, but the supported ids will, so there is
/// no guarantee that all and only the ids in the returned map will
/// be visible and supported by the service in subsequent calls,
/// nor is there any guarantee that the current display names match
/// those in the set. The display names are sorted based on the
/// comparer provided.
/// </summary>
public virtual IDictionary <string, string> GetDisplayNames(UCultureInfo locale, IComparer <string> com, string matchID)
{
IDictionary <string, string> dncache = null;
LocaleRef reference = dnref;
if (reference != null)
{
dncache = reference.Get(locale, com);
}
while (dncache == null)
{
lock (syncLock)
{
if (reference == dnref || dnref == null)
{
dncache = new SortedDictionary <string, string>(com); // sorted
foreach (var e in GetVisibleIDMap())
{
string id = e.Key;
IServiceFactory f = e.Value;
dncache[f.GetDisplayName(id, locale)] = id;
}
dncache = dncache.AsReadOnly();
dnref = new LocaleRef(dncache, locale, com);
}
else
{
reference = dnref;
dncache = reference.Get(locale, com);
}
}
}
ICUServiceKey matchKey = CreateKey(matchID);
if (matchKey == null)
{
return(dncache.AsReadOnly());
}
// ICU4N: Rather than copying and then removing the items (which isn't allowed with
// .NET iterators), we reverse the logic and add the items only if they are fallback.
IDictionary <string, string> result = new SortedDictionary <string, string>(com);
foreach (var e in dncache)
{
if (matchKey.IsFallbackOf(e.Value))
{
result.Add(e.Key, e.Value);
}
}
return(result);
}
/// <summary>
/// Return a snapshot of the mapping from display names to visible
/// IDs for this service. This set will not change as factories
/// are added or removed, but the supported ids will, so there is
/// no guarantee that all and only the ids in the returned map will
/// be visible and supported by the service in subsequent calls,
/// nor is there any guarantee that the current display names match
/// those in the set. The display names are sorted based on the
/// comparer provided.
/// </summary>
public virtual SortedDictionary <string, string> GetDisplayNames(ULocale locale, IComparer <string> com, string matchID) // ICU4N TODO: API Add overloads for IComparer<StringBuilder> and IComparer<char[]> ?
{
SortedDictionary <string, string> dncache = null;
LocaleRef reference = dnref;
if (reference != null)
{
dncache = reference.Get(locale, com);
}
while (dncache == null)
{
lock (this)
{
if (reference == dnref || dnref == null)
{
dncache = new SortedDictionary <string, string>(com); // sorted
IDictionary <string, IFactory> m = GetVisibleIDMap();
using (var ei = m.GetEnumerator())
{
while (ei.MoveNext())
{
var e = ei.Current;
string id = e.Key;
IFactory f = e.Value;
dncache[f.GetDisplayName(id, locale)] = id;
}
}
// ICU4N TODO: Need to make the cache unmodifiable, but stil keep the type a SortedDictionary
//dncache = dncache.ToUnmodifiableDictionary();
dnref = new LocaleRef(dncache, locale, com);
}
else
{
reference = dnref;
dncache = reference.Get(locale, com);
}
}
}
Key matchKey = CreateKey(matchID);
if (matchKey == null)
{
return(dncache);
}
// ICU4N: Rather than copying and then removing the items (which isn't allowed with
// .NET iterators), we reverse the logic and add the items only if they are fallback.
SortedDictionary <string, string> result = new SortedDictionary <string, string>(((SortedDictionary <string, string>)dncache).Comparer);
using (var iter = dncache.GetEnumerator())
{
while (iter.MoveNext())
{
var e = iter.Current;
if (matchKey.IsFallbackOf(e.Value))
{
result.Add(e.Key, e.Value);
}
}
}
return(result);
}
