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 }