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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.schema.validator;
18  
19  import org.opensaml.xml.schema.XSString;
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.schema.XSString} for Schema compliance. 
26   * 
27   * @param <T> the type to be validated
28   */
29  public class XSStringSchemaValidator<T extends XSString> implements Validator<T> {
30      
31      /** Flag specifying whether empty element content should be allowed. */
32      private boolean allowEmptyContent;
33      
34      /**
35       * Constructor.
36       *
37       * @param allowEmptyElementContent flag indicated whether empty content should be allowed
38       */
39      public XSStringSchemaValidator(boolean allowEmptyElementContent) {
40          allowEmptyContent = allowEmptyElementContent;
41      }
42      
43      /**
44       * Constructor.
45       * 
46       * Empty content is not allowed.
47       *
48       */
49      public XSStringSchemaValidator() {
50          allowEmptyContent = false;
51      }
52  
53      /** {@inheritDoc} */
54      public void validate(T xmlObject) throws ValidationException {
55          validateStringContent(xmlObject);
56      }
57      
58      /**
59       * Get the flag which determines whether empty content should be allowed.
60       * 
61       * @return true if empty content should be allowed, false otherwise
62       */
63      protected boolean isAllowEmptyContent() {
64          return allowEmptyContent;
65      }
66  
67      /**
68       * Validates the content of the XSBase64Binary object.
69       * 
70       * @param xmlObject the object to evaluate
71       * @throws ValidationException thrown if the content of the Base64Binary object is invalid
72       */
73      protected void validateStringContent(T xmlObject) throws ValidationException {
74          if (! isAllowEmptyContent()) {
75              if (DatatypeHelper.isEmpty(xmlObject.getValue())) {
76                  throw new ValidationException("String content may not be empty");
77              }
78          }
79      }
80  
81  }