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1   /*
2    * Copyright [2007] [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.xml.security.credential;
18  
19  import org.opensaml.xml.security.CriteriaSet;
20  import org.opensaml.xml.security.SecurityException;
21  
22  /**
23   * Abstract base class for {@link CredentialResolver} implementations.
24   */
25  public abstract class AbstractCredentialResolver implements CredentialResolver {
26  
27      /** {@inheritDoc} */
28      public Credential resolveSingle(CriteriaSet criteriaSet) throws SecurityException {
29          Iterable<Credential> creds = resolve(criteriaSet);
30          if (creds.iterator().hasNext()) {
31              return creds.iterator().next();
32          } else {
33              return null;
34          }
35      }
36  
37      /** {@inheritDoc} */
38      public abstract Iterable<Credential> resolve(CriteriaSet criteriaSet) throws SecurityException;
39  
40  }