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1   /*
2    * Copyright [2006] [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.encryption.impl;
18  
19  import java.util.ArrayList;
20  import java.util.Collections;
21  import java.util.List;
22  
23  import org.opensaml.xml.XMLObject;
24  import org.opensaml.xml.encryption.DataReference;
25  import org.opensaml.xml.encryption.KeyReference;
26  import org.opensaml.xml.encryption.ReferenceList;
27  import org.opensaml.xml.encryption.ReferenceType;
28  import org.opensaml.xml.util.IndexedXMLObjectChildrenList;
29  import org.opensaml.xml.validation.AbstractValidatingXMLObject;
30  
31  /**
32   * Concrete implementation of {@link org.opensaml.xml.encryption.ReferenceList}
33   */
34  public class ReferenceListImpl extends AbstractValidatingXMLObject implements ReferenceList {
35      
36      /** ReferenceType child elements */
37      private final IndexedXMLObjectChildrenList indexedChildren;
38      
39      /**
40       * Constructor
41       *
42       * @param namespaceURI
43       * @param elementLocalName
44       * @param namespacePrefix
45       */
46      protected ReferenceListImpl(String namespaceURI, String elementLocalName, String namespacePrefix) {
47          super(namespaceURI, elementLocalName, namespacePrefix);
48          indexedChildren = new IndexedXMLObjectChildrenList<ReferenceType>(this);
49      }
50  
51      /** {@inheritDoc} */
52      public List<ReferenceType> getReferences() {
53          return (List<ReferenceType>) indexedChildren;
54      }
55  
56      /** {@inheritDoc} */
57      public List<DataReference> getDataReferences() {
58          return (List<DataReference>) indexedChildren.subList(DataReference.DEFAULT_ELEMENT_NAME);
59      }
60  
61      /** {@inheritDoc} */
62      public List<KeyReference> getKeyReferences() {
63          return (List<KeyReference>) indexedChildren.subList(KeyReference.DEFAULT_ELEMENT_NAME);
64      }
65  
66      /** {@inheritDoc} */
67      public List<XMLObject> getOrderedChildren() {
68          ArrayList<XMLObject> children = new ArrayList<XMLObject>();
69          
70          children.addAll((List<XMLObject>) indexedChildren);
71          
72          if (children.size() == 0) {
73              return null;
74          }
75          
76          return Collections.unmodifiableList(children);
77      }
78  
79  }