Import code from internal repository to git

java/com/google/domain/registry/tldconfig/idn/IdnTableEnum.java

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+// Copyright 2016 Google Inc. 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 static com.google.common.io.Resources.readLines;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.google.common.base.Ascii;
+import com.google.common.io.Resources;
+
+import java.io.IOException;
+import java.net.URL;
+
+/** Wrapper enum that loads all {@link IdnTable} resources into memory. */
+public enum IdnTableEnum {
+  EXTENDED_LATIN,
+  JA;
+
+  private final IdnTable table;
+
+  private IdnTableEnum() {
+    this.table = load(Ascii.toLowerCase(name()));
+  }
+
+  public IdnTable getTable() {
+    return table;
+  }
+
+  private static IdnTable load(String name) {
+    try {
+      URL resource = Resources.getResource(IdnTableEnum.class, name + ".txt");
+      return IdnTable.createFrom(name, readLines(resource, UTF_8), LanguageValidator.get(name));
+    } catch (IOException e) {
+      throw new RuntimeException(e);  // should never happen
+    }
+  }
+}