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1   /*
2    * Copyright 2005-2010 the original author or authors.
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.springframework.ws.soap.security.callback;
18  
19  import java.io.IOException;
20  import javax.security.auth.callback.Callback;
21  import javax.security.auth.callback.CallbackHandler;
22  import javax.security.auth.callback.UnsupportedCallbackException;
23  
24  import org.apache.commons.logging.Log;
25  import org.apache.commons.logging.LogFactory;
26  
27  /**
28   * Abstract implementation of a <code>CallbackHandler</code>.
29   *
30   * @author Arjen Poutsma
31   * @since 1.0.0
32   */
33  public abstract class AbstractCallbackHandler implements CallbackHandler {
34  
35      /** Logger available to subclasses. */
36      protected final Log logger = LogFactory.getLog(getClass());
37  
38      protected AbstractCallbackHandler() {
39      }
40  
41      /**
42       * Iterates over the given callbacks, and calls <code>handleInternal</code> for each of them.
43       *
44       * @param callbacks the callbacks
45       * @see #handleInternal(javax.security.auth.callback.Callback)
46       */
47      public final void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
48          for (Callback callback : callbacks) {
49              handleInternal(callback);
50          }
51      }
52  
53      /** Template method that should be implemented by subclasses. */
54      protected abstract void handleInternal(Callback callback) throws IOException, UnsupportedCallbackException;
55  }