// Copyright 2012 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.collide.client.search.awesomebox.host;

import com.google.collide.shared.util.ListenerManager;
import com.google.collide.shared.util.ListenerRegistrar;

/**
 * The model for the {@link AwesomeBoxComponentHost}.
 *
 */
public class AwesomeBoxComponentHostModel {

  interface ComponentStatusChangedListener {
    public void onComponentChanged();
  }

  private final ListenerManager<ComponentStatusChangedListener>
      componentStatusChangedListenerManager = ListenerManager.create();
  private AwesomeBoxComponent defaultComponent;
  private AwesomeBoxComponent currentComponent;

  /**
   * Returns the registration interface for clients to listen to be notified
   * when the active component is changed.
   */
  public ListenerRegistrar<ComponentStatusChangedListener> getComponentChangedListenerRegistrar() {
    return componentStatusChangedListenerManager;
  }
  
  public void setDefaultComponent(AwesomeBoxComponent defaultComponent) {
    this.defaultComponent = defaultComponent;
    if (currentComponent == null) {
      currentComponent = defaultComponent;
    }
  }
  
  public void setActiveComponent(AwesomeBoxComponent component) {
    currentComponent = component;
  }

  public AwesomeBoxComponent getActiveComponent() {
    return currentComponent;
  }
  
  public void revertToDefaultComponent() {
    currentComponent = defaultComponent;
  }
}