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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2015 The Closure Compiler Authors.
 *
 * 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 java.util;

import com.google.javascript.jscomp.resources.GwtProperties;
import com.google.javascript.jscomp.resources.ResourceLoader;

/**
 * GWT compatible replacement for {@code ResourceBundle} that defers to {@link ResourceLoader} for
 * specific known properties files.
 */
public class ResourceBundle {
  private static final Map CACHE = new HashMap<>();

  private final GwtProperties properties;

  private ResourceBundle(GwtProperties properties) {
    this.properties = properties;
  }

  public String getString(String key) throws MissingResourceException {
    String value = properties.getProperty(key);
    if (value == null) {
      throw new MissingResourceException("no key found", null, key);
    }
    return value;
  }

  public static ResourceBundle getBundle(String baseName) {
    String resourceName;
    if ("com.google.javascript.rhino.Messages".equals(baseName)) {
      resourceName = "rhino/Messages.properties";
    } else if ("com.google.javascript.jscomp.parsing.ParserConfig".equals(baseName)) {
      resourceName = "parsing/ParserConfig.properties";
    } else {
      throw new RuntimeException("ResourceBundle not available: " + baseName);
    }

    ResourceBundle bundle = CACHE.get(resourceName);
    if (bundle == null) {
      String resource = ResourceLoader.loadTextResource(null, resourceName);
      bundle = new ResourceBundle(GwtProperties.load(resource));
      CACHE.put(resourceName, bundle);
    }
    return bundle;
  }

  public static ResourceBundle getBundle(String baseName, Locale locale) {
    return getBundle(baseName);
  }

}