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1   /*
2    * Copyright [2005] [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.signature;
18  
19  import org.opensaml.xml.AbstractXMLObject;
20  import org.opensaml.xml.util.XMLConstants;
21  import org.w3c.dom.Element;
22  import org.w3c.dom.Node;
23  import org.w3c.dom.NodeList;
24  
25  /**
26   * Base for signable XMLObjects.
27   */
28  public abstract class AbstractSignableXMLObject extends AbstractXMLObject implements SignableXMLObject {
29  
30      /** XMLSecSignatureImpl */
31      private Signature signature;
32  
33      /**
34       * Constructor
35       * 
36       * @param namespaceURI the namespace the element is in
37       * @param elementLocalName the local name of the XML element this Object represents
38       * @param namespacePrefix the prefix for the given namespace
39       */
40      protected AbstractSignableXMLObject(String namespaceURI, String elementLocalName, String namespacePrefix) {
41          super(namespaceURI, elementLocalName, namespacePrefix);
42      }
43  
44      /** {@inheritDoc} */
45      public boolean isSigned() {
46          Element domElement = getDOM();
47  
48          if (domElement == null) {
49              return false;
50          }
51  
52          NodeList children = domElement.getChildNodes();
53          Element childElement;
54          for (int i = 0; i < children.getLength(); i++) {
55              if (children.item(i).getNodeType() != Node.ELEMENT_NODE) {
56                  continue;
57              }
58  
59              childElement = (Element) children.item(i);
60              if (childElement.getNamespaceURI().equals(XMLConstants.XMLSIG_NS)
61                      && childElement.getLocalName().equals(Signature.DEFAULT_ELEMENT_LOCAL_NAME)) {
62                  return true;
63              }
64          }
65  
66          return false;
67      }
68  
69      /** {@inheritDoc} */
70      public Signature getSignature() {
71          return signature;
72      }
73  
74      /** {@inheritDoc} */
75      public void setSignature(Signature newSignature) {
76          signature = prepareForAssignment(signature, newSignature);
77      }
78  }