TreeNodeCache.java

/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package com.celements.navigation.service;

import org.xwiki.component.annotation.Component;
import org.xwiki.component.annotation.InstantiationStrategy;
import org.xwiki.component.annotation.Requirement;
import org.xwiki.component.descriptor.ComponentInstantiationStrategy;
import org.xwiki.context.Execution;

import com.celements.navigation.cmd.GetMappedMenuItemsForParentCommand;
import com.celements.navigation.cmd.GetNotMappedMenuItemsForParentCommand;
import com.xpn.xwiki.XWikiContext;

/**
 * TreeNodeCache must be a singleton to ensure efficient caching
 *
 * @author Fabian Pichler
 */
@Component
@InstantiationStrategy(ComponentInstantiationStrategy.SINGLETON)
public class TreeNodeCache implements ITreeNodeCache {

  private GetMappedMenuItemsForParentCommand injected_GetMappedMenuItemCommand;

  private volatile GetNotMappedMenuItemsForParentCommand notMappedMenuItemCommand;

  @Requirement
  private Execution execution;

  private XWikiContext getContext() {
    return (XWikiContext) execution.getContext().getProperty("xwikicontext");
  }

  /*
   * (non-Javadoc)
   *
   * @see com.celements.web.utils.IWebUtils#queryCount()
   */
  @Override
  public int queryCount() {
    return getNotMappedMenuItemsForParentCmd().queryCount();
  }

  void inject_GetNotMappedMenuItemsForParentCmd(
      GetNotMappedMenuItemsForParentCommand testGetMenuItemCommand) {
    notMappedMenuItemCommand = testGetMenuItemCommand;
  }

  @Override
  synchronized public GetNotMappedMenuItemsForParentCommand getNotMappedMenuItemsForParentCmd() {
    if (notMappedMenuItemCommand == null) {
      notMappedMenuItemCommand = new GetNotMappedMenuItemsForParentCommand();
    }
    return notMappedMenuItemCommand;
  }

  /*
   * (non-Javadoc)
   *
   * @see com.celements.web.utils.IWebUtils#flushMenuItemCache(com.xpn.xwiki.XWikiContext)
   */
  @Override
  public void flushMenuItemCache() {
    getNotMappedMenuItemsForParentCmd().flushMenuItemCache(getContext());
  }

  void inject_GetMappedMenuItemsForParentCmd(
      GetMappedMenuItemsForParentCommand testGetMenuItemCommand) {
    injected_GetMappedMenuItemCommand = testGetMenuItemCommand;
  }

  @Override
  public GetMappedMenuItemsForParentCommand getMappedMenuItemsForParentCmd() {
    if (injected_GetMappedMenuItemCommand != null) {
      return injected_GetMappedMenuItemCommand;
    }
    XWikiContext context = getContext();
    if ((context.get(GetMappedMenuItemsForParentCommand.CELEMENTS_MAPPED_MENU_ITEMS_KEY) != null)
        && (context.get(
            GetMappedMenuItemsForParentCommand.CELEMENTS_MAPPED_MENU_ITEMS_KEY) instanceof GetMappedMenuItemsForParentCommand)) {
      return (GetMappedMenuItemsForParentCommand) context.get(
          GetMappedMenuItemsForParentCommand.CELEMENTS_MAPPED_MENU_ITEMS_KEY);
    }
    GetMappedMenuItemsForParentCommand cmd = new GetMappedMenuItemsForParentCommand();
    cmd.setIsActive(false);
    return cmd;
  }

}