1 /**
2 * Copyright 2008 Bryan Ray
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 package uk.org.bryanray.testtoys.generator.sequencegenerators;
17
18 import java.util.ArrayList;
19 import java.util.List;
20 import java.util.Random;
21
22
23 /**
24 * <DL>
25 * <DT><B>Project:</B></DT>
26 * <DD>TestDataLoader</DD>
27 * <DT><B>Filename:</B></DT>
28 * <DD>RandomEnumerationGenerator.java</DD>
29 * <DT><B>Creation Date:</B></DT>
30 * <DD>29 May 2008</DD>
31 * </DL>
32 *
33 * A sequence generator that serves up a list of values in a random order.
34 *
35 * @author Bryan Ray
36 */
37 public class RandomEnumerationGenerator implements SequenceGenerator {
38
39 private String currentValue;
40 private Random random = new Random();
41 private List<String> list;
42
43 /**
44 * @param enumeration A list of values to use as the enumeration.
45 * */
46 public RandomEnumerationGenerator(List<String> enumeration) {
47 if(0 < enumeration.size()) {
48 list = new ArrayList<String>(enumeration);
49 next();
50 }
51 else {
52 throw new IllegalArgumentException("At least one enumeration value must be supplied.");
53 }
54 }
55
56 /**
57 * {@inheritDoc}
58 */
59 public void next() {
60 int index = random.nextInt(list.size());
61 currentValue = list.get(index);
62 }
63
64 /**
65 * {@inheritDoc}
66 */
67 public String value() {
68 return currentValue;
69 }
70
71 }