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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.signature.validator;
18  
19  import org.opensaml.xml.signature.Signature;
20  import org.opensaml.xml.util.DatatypeHelper;
21  import org.opensaml.xml.validation.ValidationException;
22  import org.opensaml.xml.validation.Validator;
23  
24  /**
25   * Checks {@link org.opensaml.xml.signature.Signature} for Schema compliance. 
26   */
27  public class SignatureSchemaValidator implements Validator<Signature> {
28  
29      /** {@inheritDoc} */
30      public void validate(Signature xmlObject) throws ValidationException {
31          validateSignatureMethod(xmlObject);
32          validateCanonicalizationMethod(xmlObject);
33      }
34  
35      /**
36       * Check the canonicalization method.
37       * 
38       * @param xmlObject the object to be validated
39       * @throws ValidationException thrown if object is invalid
40       */
41      protected void validateCanonicalizationMethod(Signature xmlObject) throws ValidationException {
42          if (DatatypeHelper.isEmpty(xmlObject.getCanonicalizationAlgorithm())) {
43              throw new ValidationException("The CanonicalizationMethod value was empty");
44          }
45      }
46  
47      /**
48       * Check the signature method.
49       * 
50       * @param xmlObject the object to be validated
51       * @throws ValidationException thrown if object is invalid
52       */
53      protected void validateSignatureMethod(Signature xmlObject) throws ValidationException {
54          if (DatatypeHelper.isEmpty(xmlObject.getSignatureAlgorithm())) {
55              throw new ValidationException("The SignatureMethod value was empty");
56          }
57      }
58  
59  }