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// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

package org.cef.handler;

import org.cef.browser.CefBrowser;
import org.cef.callback.CefNative;
import org.cef.callback.CefQueryCallback;

/**
 * Implement this interface to handle queries. All methods will be executed on
 * the browser process UI thread.
 */
public interface CefMessageRouterHandler extends CefNative {

  /**
   * Called when the browser receives a JavaScript query.
   * @param browser The browser generating the event.
   * @param query_id The unique ID for the query.
   * @param persistent True if the query is persistent.
   * @param callback Object used to continue or cancel the query asynchronously.
   * 
   * @return true to handle the query or false to propagate the query to other 
   * registered handlers, if any. If no handlers return true from this method 
   * then the query will be automatically canceled with an error code of -1
   * delivered to the JavaScript onFailure callback.
   */
  public boolean onQuery(CefBrowser browser,
                         long query_id,
                         String request,
                         boolean persistent,
                         CefQueryCallback callback);

  /**
   * Called when a pending JavaScript query is canceled.
   * @param browser The browser generating the event.
   * @param query_id The unique ID for the query.
   */
  public void onQueryCanceled(CefBrowser browser,
                              long query_id);
}