/**
 * Copyright 2010 Google Inc.
 *
 * 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 org.waveprotocol.box.server.rpc.render.view.impl;

import org.waveprotocol.box.server.rpc.render.view.BlipMenuItemView;
import org.waveprotocol.box.server.rpc.render.view.BlipMetaView;
import org.waveprotocol.box.server.rpc.render.view.IntrinsicBlipMenuItemView;
import org.waveprotocol.box.server.rpc.render.view.IntrinsicBlipMetaView.MenuOption;

/**
 * Implements a blip menu-item view by delegating primitive state matters to a
 * view object, and structural state matters to a helper. The intent is that the
 * helper is a flyweight handler.
 *
 * @param <I> intrinsic menu-item implementation
 */
public final class BlipMenuItemViewImpl<I extends IntrinsicBlipMenuItemView> // \u2620
    extends AbstractStructuredView<BlipMenuItemViewImpl.Helper<? super I>, I> // \u2620
    implements BlipMenuItemView {

  /**
   * Handles structural queries on menu-item views.
   *
   * @param <I> intrinsic menu-item implementation
   */
  public interface Helper<I> {

    //
    // Structure
    //

    void remove(I impl);

    BlipMetaView getParent(I impl);
  }

  private BlipMenuItemViewImpl(Helper<? super I> helper, I impl) {
    super(helper, impl);
  }

  public static <I extends IntrinsicBlipMenuItemView> BlipMenuItemViewImpl<I> create(
      Helper<? super I> helper, I impl) {
    return new BlipMenuItemViewImpl<I>(helper, impl);
  }

  @Override
  public Type getType() {
    return Type.MENU_ITEM;
  }

  //
  // Structural delegation.
  //

  @Override
  public BlipMetaView getParent() {
    return helper.getParent(impl);
  }

  @Override
  public void remove() {
    helper.remove(impl);
  }

  //
  // Intrinsic delegation.
  //

  @Override
  public void select() {
    impl.select();
  }

  @Override
  public void deselect() {
    impl.deselect();
  }

  @Override
  public MenuOption getOption() {
    return impl.getOption();
  }

  @Override
  public void setOption(MenuOption option) {
    impl.setOption(option);
  }

  @Override
  public boolean isSelected() {
    return impl.isSelected();
  }
}