code: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.apache.cxf.ws.security.tokenstore;
  
  import java.io.IOException;
  import java.net.URL;
  
  import org.apache.cxf.common.classloader.ClassLoaderUtils;
  import org.apache.cxf.message.Message;
  import org.apache.cxf.resource.ResourceManager;
  import org.apache.cxf.ws.security.SecurityConstants;
  import org.apache.cxf.ws.security.cache.ReplayCacheFactory;
  
  /**
   * An abstract factory to return a TokenStore instance. It returns an EHCacheTokenStoreFactory
   * if EH-Cache is available. Otherwise it returns a MemoryTokenStoreFactory.
   */
  public abstract class TokenStoreFactory {
      
      private static boolean ehCacheInstalled;
      
      static {
          try {
              Class<?> cacheManagerClass = 
                  ClassLoaderUtils.loadClass("net.sf.ehcache.CacheManager", TokenStoreFactory.class);
              if (cacheManagerClass != null) {
                  ehCacheInstalled = true;
              }
          } catch (Exception e) {
              //ignore
          }
      }
      
      protected static synchronized boolean isEhCacheInstalled() {
          return ehCacheInstalled;
      }
      
      public static TokenStoreFactory newInstance() {
          if (isEhCacheInstalled()) {
              return new EHCacheTokenStoreFactory();
          }
          
          return new MemoryTokenStoreFactory();
      }
      
      public abstract TokenStore newTokenStore(String key, Message message);
      
      protected URL getConfigFileURL(Message message) {
          Object o = message.getContextualProperty(SecurityConstants.CACHE_CONFIG_FILE);
          if (o instanceof String) {
              URL url = null;
              ResourceManager rm = message.getExchange().getBus().getExtension(ResourceManager.class);
              url = rm.resolveResource((String)o, URL.class);
              try {
                  if (url == null) {
                      url = ClassLoaderUtils.getResource((String)o, ReplayCacheFactory.class);
                  }
                  if (url == null) {
                      url = new URL((String)o);
                  }
                  return url;
              } catch (IOException e) {
                  // Do nothing
              }
          } else if (o instanceof URL) {
              return (URL)o;        
          }
          return null;
      }
      
  }
  