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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.common;
18  
19  /**
20   * Interface for identifier generators.  This identifier can be used for things like
21   * digital signature identifiers, opaque principal identifiers, etc. 
22   */
23  public interface IdentifierGenerator {
24  
25      /**
26       * Generates a 16 byte identifier.
27       * 
28       * @return an hex encoded identifier
29       */
30      public String generateIdentifier();
31      
32      /** Generates a random identifier.
33       * 
34       * @param size number of bytes in the identifier
35       * 
36       * @return the hex encoded identifier
37       */
38      public String generateIdentifier(int size);
39  }