mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

java/google/registry/tldconfig/idn/LanguageValidator.java

@@ -0,0 +1,33 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.domain.registry.tldconfig.idn;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.ImmutableMap;
+
+abstract class LanguageValidator {
+
+  /** A registry of all known language validators keyed by their language code. */
+  private static final ImmutableMap<String, LanguageValidator> LANGUAGE_VALIDATORS =
+      ImmutableMap.<String, LanguageValidator>of("ja", new JapaneseLanguageValidator());
+
+  /** Return the language validator for the given language code (if one exists). */
+  static Optional<LanguageValidator> get(String language) {
+    return Optional.fromNullable(LANGUAGE_VALIDATORS.get(language));
+  }
+
+  /** Returns true if the label meets the context rules for this language. */
+  abstract boolean isValidLabelForLanguage(String label);
+}