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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 2004 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 com.google.javascript.jscomp;

/**
 * An interface for providing alternative values for user-visible messages in
 * JavaScript code.
 */
public interface MessageBundle {

  /**
   * Gets the message ID generator to use to compute message IDs for this
   * type of bundle.
   * @return idGenerator instance or null if we do not want to use any custom
   *     id generation. In case if idGenerator is null caller should decide how
   *     to create id by itself. In the most cases using the message key is
   *     enough.
   */
  public JsMessage.IdGenerator idGenerator();

  /**
   * Gets a message replacement.
   *
   * @param id the id of the message being replaced; the key is message ID
   *     generated by {@link JsMessage.IdGenerator}
   * @return the message replacement, which may be null.
   */
  public JsMessage getMessage(String id);

  /**
   * Returns an iterable over the keys that this object has replacements for.
   * @return all messages from this bundle.
   */
  public Iterable getAllMessages();
}