// Copyright (c) 2010 The Chromium 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.chromium.sdk;

/**

 * Helper class for experimental support of LiveEdit feature. While regular API does not

 * support LiveEdit (not to break compatibility with existing clients), it gives access to extended

 * interfaces.

 * <p>

 * This class encapsulates all instanceofs/casts that are considered to be untrackable

 * in the main code and therefore harmful.

 */

public class LiveEditExtension {

  /**

   * Casts script to the interface that supports updating source on remote VM.

   * @return extended interface or null if unsupported

   */

  public static UpdatableScript castToUpdatableScript(Script script) {

    if (script instanceof UpdatableScript == false) {

      return null;

    }

    return (UpdatableScript) script;

  }

  /**

   * Casts listener to interface that accepts LiveEdit-related events.

   * @return extended interface or null if unsupported

   */

  public static LiveEditDebugEventListener castToLiveEditListener(

      DebugEventListener debugEventListener) {

    if (debugEventListener instanceof LiveEditDebugEventListener == false) {

      return null;

    }

    return (LiveEditDebugEventListener) debugEventListener;

  }

}