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 }