/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.security;

import java.security.Principal;
import java.util.ArrayList;

import com.caucho.loader.Environment;
import com.caucho.loader.EnvironmentLocal;

/**
 * Manages role mapping
 */
public class RoleMapManager
{
  private static final EnvironmentLocal<RoleMapManager> _localManager
    = new EnvironmentLocal<RoleMapManager>();

  private final String _id;
  
  private final RoleMapManager _parent;

  private ArrayList<RoleMap> _roleMapList
    = new ArrayList<RoleMap>();

  private RoleMapManager(RoleMapManager parent)
  {
    _id = Environment.getEnvironmentName();
    
    _parent = parent;
  }

  /**
   * Returns the current manager.
   */
  public static RoleMapManager getCurrent()
  {
    return _localManager.get();
  }

  /**
   * Returns the current manager, creating if necessary.
   */
  public static RoleMapManager create()
  {
    synchronized (_localManager) {
      RoleMapManager manager = _localManager.getLevel();

      if (manager == null) {
        RoleMapManager parent = _localManager.get();

        manager = new RoleMapManager(parent);
        _localManager.set(manager);
      }

      return manager;
    }
  }

  /**
   * Adds a role map.
   */
  public void addRoleMap(RoleMap roleMap)
  {
    _roleMapList.add(roleMap);
  }

  /**
   * Checks for role matching.
   */
  public Boolean isUserInRole(String role, Principal user)
  {
    int size = _roleMapList.size();
    
    for (int i = 0; i < size; i++) {
      RoleMap roleMap = _roleMapList.get(i);

      Boolean result = roleMap.isUserInRole(role, user);

      if (result != null)
        return result;
    }

    if (_parent != null)
      return _parent.isUserInRole(role, user);
    else if (size > 0) {
      // server/1ae0
      
      return Boolean.FALSE;
    }
    else
      return null;
  }

  public String toString()
  {
    return getClass().getSimpleName() + "[" + _id + "]";
  }
}