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1   /*
2    * Copyright 2009 University Corporation for Advanced Internet Development, Inc.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.opensaml.ws.message.handler;
18  
19  import java.util.List;
20  
21  import org.opensaml.ws.message.MessageContext;
22  import org.opensaml.xml.util.LazyList;
23  import org.slf4j.Logger;
24  import org.slf4j.LoggerFactory;
25  
26  /**
27   * A basic implementation of {@link HandlerChain}.
28   */
29  public class BasicHandlerChain implements HandlerChain {
30      
31      /** Class logger. */
32      private final Logger log = LoggerFactory.getLogger(BasicHandlerChain.class);
33      
34      /** The handler chain. */
35      private List<Handler> handlers;
36  
37      /** Constructor. */
38      public BasicHandlerChain() {
39          handlers = new LazyList<Handler>();
40      }
41  
42      /** {@inheritDoc} */
43      public List<Handler> getHandlers() {
44          return handlers;
45      }
46  
47      /** {@inheritDoc} */
48      public void invoke(MessageContext msgContext) throws HandlerException {
49          log.trace("Invoking handler chain");
50          for (Handler handler : getHandlers()) {
51              log.trace("Invoking handler: {}", handler.getClass().getName());
52              handler.invoke(msgContext);
53          }
54      }
55  
56  }