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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.common.impl;
18  
19  import java.util.Random;
20  
21  import org.bouncycastle.util.encoders.Hex;
22  import org.opensaml.common.IdentifierGenerator;
23  
24  /**
25   * Generates identifiers using random data obtained from a {@link java.util.Random} instance.
26   */
27  public class RandomIdentifierGenerator implements IdentifierGenerator {
28  
29      /** Random number generator. */
30      private static Random random;
31  
32      /**
33       * Constructor.
34       */
35      public RandomIdentifierGenerator() {
36          random = new Random();
37      }
38  
39      /** {@inheritDoc} */
40      public String generateIdentifier() {
41          return generateIdentifier(16);
42      }
43  
44      /** {@inheritDoc} */
45      public String generateIdentifier(int size) {
46          byte[] buf = new byte[size];
47          random.nextBytes(buf);
48          return "_".concat(new String(Hex.encode(buf)));
49      }
50  }