/// <summary>
/// Attempt to find a source-target/variant in the static locale resource
/// store. Do not perform fallback. Return 0 on failure.
/// On success, create a new entry object, register it in the dynamic store,
/// and return a pointer to it, but do not make it public -- just because
/// someone requested something, we do not expand the available ID list (or
/// spec DAG).
/// </summary>
///
private Object[] FindInStaticStore(TransliteratorRegistry.Spec src, TransliteratorRegistry.Spec trg, String variant)
{
if (DEBUG)
{
String ID_0 = IBM.ICU.Text.TransliteratorIDParser.STVtoID(src.Get(), trg.Get(),
variant);
System.Console.Out
.WriteLine("TransliteratorRegistry.findInStaticStore:" + ID_0);
}
Object[] entry = null;
if (src.IsLocale())
{
entry = FindInBundle(src, trg, variant, IBM.ICU.Text.Transliterator.FORWARD);
}
else if (trg.IsLocale())
{
entry = FindInBundle(trg, src, variant, IBM.ICU.Text.Transliterator.REVERSE);
}
// If we found an entry, store it in the Hashtable for next
// time.
if (entry != null)
{
RegisterEntry(src.GetTop(), trg.GetTop(), variant, entry, false);
}
return(entry);
}
/// <summary>
/// Top-level find method. Attempt to find a source-target/variant in either
/// the dynamic or the static (locale resource) store. Perform fallback.
/// Lookup sequence for ss_SS_SSS-tt_TT_TTT/v:
/// ss_SS_SSS-tt_TT_TTT/v -- in hashtable ss_SS_SSS-tt_TT_TTT/v -- in
/// ss_SS_SSS (no fallback)
/// repeat with t = tt_TT_TTT, tt_TT, tt, and tscript
/// ss_SS_SSS-t//// ss_SS-t//// ss-t//// sscript-t/
/// Here/// matches the first variant listed.
/// Caller does NOT own returned object. Return 0 on failure.
/// </summary>
///
private Object[] Find(String source, String target, String variant)
{
TransliteratorRegistry.Spec src = new TransliteratorRegistry.Spec(source);
TransliteratorRegistry.Spec trg = new TransliteratorRegistry.Spec(target);
Object[] entry = null;
if (variant.Length != 0)
{
// Seek exact match in hashtable
entry = FindInDynamicStore(src, trg, variant);
if (entry != null)
{
return(entry);
}
// Seek exact match in locale resources
entry = FindInStaticStore(src, trg, variant);
if (entry != null)
{
return(entry);
}
}
for (;;)
{
src.Reset();
for (;;)
{
// Seek match in hashtable
entry = FindInDynamicStore(src, trg, NO_VARIANT);
if (entry != null)
{
return(entry);
}
// Seek match in locale resources
entry = FindInStaticStore(src, trg, NO_VARIANT);
if (entry != null)
{
return(entry);
}
if (!src.HasFallback())
{
break;
}
src.Next();
}
if (!trg.HasFallback())
{
break;
}
trg.Next();
}
return(null);
}
/// <summary>
/// Attempt to find a source-target/variant in the dynamic registry store.
/// Return 0 on failure.
/// </summary>
///
private Object[] FindInDynamicStore(TransliteratorRegistry.Spec src, TransliteratorRegistry.Spec trg, String variant)
{
String ID_0 = IBM.ICU.Text.TransliteratorIDParser.STVtoID(src.Get(), trg.Get(),
variant);
if (DEBUG)
{
System.Console.Out.WriteLine("TransliteratorRegistry.findInDynamicStore:"
+ ID_0);
}
return((Object[])registry[new CaseInsensitiveString(ID_0)]);
}
/// <summary>
/// Attempt to find an entry in a single resource bundle. This is a one-sided
/// lookup. findInStaticStore() performs up to two such lookups, one for the
/// source, and one for the target.
/// Do not perform fallback. Return 0 on failure.
/// On success, create a new Entry object, populate it, and return it. The
/// caller owns the returned object.
/// </summary>
///
private Object[] FindInBundle(TransliteratorRegistry.Spec specToOpen, TransliteratorRegistry.Spec specToFind,
String variant, int direction_0)
{
// assert(specToOpen.isLocale());
ResourceBundle res_1 = specToOpen.GetBundle();
if (res_1 == null)
{
// This means that the bundle's locale does not match
// the current level of iteration for the spec.
return(null);
}
for (int pass = 0; pass < 2; ++pass)
{
StringBuilder tag = new StringBuilder();
// First try either TransliteratorTo_xxx or
// TransliterateFrom_xxx, then try the bidirectional
// Transliterate_xxx. This precedence order is arbitrary
// but must be consistent and documented.
if (pass == 0)
{
tag.Append((direction_0 == IBM.ICU.Text.Transliterator.FORWARD) ? "TransliterateTo"
: "TransliterateFrom");
}
else
{
tag.Append("Transliterate");
}
tag.Append(specToFind.Get().ToUpper());
try {
// The Transliterate*_xxx resource is an array of
// strings of the format { <v0>, <r0>, ... }. Each
// <vi> is a variant name, and each <ri> is a rule.
String[] subres = res_1.GetStringArray(tag.ToString());
// assert(subres != null);
// assert(subres.length % 2 == 0);
int i = 0;
if (variant.Length != 0)
{
for (i = 0; i < subres.Length; i += 2)
{
if (subres[i].Equals(variant, StringComparison.InvariantCultureIgnoreCase))
{
break;
}
}
}
if (i < subres.Length)
{
// We have a match, or there is no variant and i == 0.
// We have succeeded in loading a string from the
// locale resources. Return the rule string which
// will itself become the registry entry.
// The direction is always forward for the
// TransliterateTo_xxx and TransliterateFrom_xxx
// items; those are unidirectional forward rules.
// For the bidirectional Transliterate_xxx items,
// the direction is the value passed in to this
// function.
int dir = (pass == 0) ? IBM.ICU.Text.Transliterator.FORWARD : direction_0;
return(new Object[] { new TransliteratorRegistry.LocaleEntry(subres[i + 1], dir) });
}
} catch (MissingManifestResourceException e) {
if (DEBUG)
{
System.Console.Out.WriteLine("missing resource: " + e);
}
}
}
// If we get here we had a missing resource exception or we
// failed to find a desired variant.
return(null);
}
