Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
PrefixedAlphanumericGenerator |
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1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | package org.apache.commons.id.serial; | |
18 | ||
19 | /** | |
20 | * <code>PrefixedAlphanumericGenerator</code> is an identifier generator | |
21 | * that generates an incrementing number in base 36 with a prefix as a String | |
22 | * object. | |
23 | * | |
24 | * <p>All generated ids have the same length (prefixed and padded with 0's | |
25 | * on the left), which is determined by the <code>size</code> parameter passed | |
26 | * to the constructor.<p> | |
27 | * | |
28 | * <p>The <code>wrap</code> property determines whether or not the sequence wraps | |
29 | * when it reaches the largest value that can be represented in <code>size</code> | |
30 | * base 36 digits. If <code>wrap</code> is false and the the maximum representable | |
31 | * value is exceeded, an {@link IllegalStateException} is thrown.</p> | |
32 | * | |
33 | * @author Commons-Id team | |
34 | * @version $Id$ | |
35 | */ | |
36 | public class PrefixedAlphanumericGenerator extends AlphanumericGenerator { | |
37 | ||
38 | /** Prefix. */ | |
39 | private final String prefix; | |
40 | ||
41 | ||
42 | /** | |
43 | * Create a new prefixed alphanumeric generator with the specified prefix. | |
44 | * | |
45 | * @param prefix prefix, must not be null | |
46 | * @param wrap should the factory wrap when it reaches the maximum | |
47 | * value that can be represented in <code>size</code> base 36 digits | |
48 | * (or throw an exception) | |
49 | * @param size the size of the identifier, including prefix length | |
50 | * @throws IllegalArgumentException if size less prefix length is not at least one | |
51 | * @throws NullPointerException if prefix is <code>null</code> | |
52 | */ | |
53 | public PrefixedAlphanumericGenerator(String prefix, boolean wrap, int size) { | |
54 | 13 | super(wrap, size - ((prefix == null) ? 0 : prefix.length())); |
55 | ||
56 | 9 | if (prefix == null) { |
57 | 1 | throw new NullPointerException("prefix must not be null"); |
58 | } | |
59 | 8 | if (size <= prefix.length()) { |
60 | 0 | throw new IllegalArgumentException("size less prefix length must be at least one"); |
61 | } | |
62 | 8 | this.prefix = prefix; |
63 | 8 | } |
64 | ||
65 | ||
66 | /** | |
67 | * Return the prefix for this prefixed alphanumeric generator. | |
68 | * | |
69 | * @return the prefix for this prefixed alphanumeric generator | |
70 | */ | |
71 | public String getPrefix() { | |
72 | 1 | return prefix; |
73 | } | |
74 | ||
75 | public long maxLength() { | |
76 | 1 | return super.maxLength() + prefix.length(); |
77 | } | |
78 | ||
79 | public long minLength() { | |
80 | 1 | return super.minLength() + prefix.length(); |
81 | } | |
82 | ||
83 | public int getSize() { | |
84 | 1 | return super.getSize() + prefix.length(); |
85 | } | |
86 | ||
87 | public String nextStringIdentifier() { | |
88 | 84 | StringBuffer sb = new StringBuffer(prefix); |
89 | 84 | sb.append(super.nextStringIdentifier()); |
90 | 83 | return sb.toString(); |
91 | } | |
92 | } |