Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2009 Mike Cumings |
| 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 com.kenai.jbosh; |
| 18 | |
| 19 | /** |
| 20 | * Data type representing the getValue of the {@code ver} attribute of the |
| 21 | * {@code bosh} element. |
| 22 | */ |
| 23 | final class AttrVersion extends AbstractAttr<String> implements Comparable { |
| 24 | |
| 25 | /** |
| 26 | * Default value if none is provided. |
| 27 | */ |
| 28 | private static final AttrVersion DEFAULT; |
| 29 | static { |
| 30 | try { |
| 31 | DEFAULT = createFromString("1.8"); |
| 32 | } catch (BOSHException boshx) { |
| 33 | throw(new IllegalStateException(boshx)); |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Major portion of the version. |
| 39 | */ |
| 40 | private final int major; |
| 41 | |
| 42 | /** |
| 43 | * Minor portion of the version. |
| 44 | */ |
| 45 | private final int minor; |
| 46 | |
| 47 | /** |
| 48 | * Creates a new attribute object. |
| 49 | * |
| 50 | * @param val attribute getValue |
| 51 | * @throws BOSHException on parse or validation failure |
| 52 | */ |
| 53 | private AttrVersion(final String val) throws BOSHException { |
| 54 | super(val); |
| 55 | |
| 56 | int idx = val.indexOf('.'); |
| 57 | if (idx <= 0) { |
| 58 | throw(new BOSHException( |
| 59 | "Illegal ver attribute value (not in major.minor form): " |
| 60 | + val)); |
| 61 | } |
| 62 | |
| 63 | String majorStr = val.substring(0, idx); |
| 64 | try { |
| 65 | major = Integer.parseInt(majorStr); |
| 66 | } catch (NumberFormatException nfx) { |
| 67 | throw(new BOSHException( |
| 68 | "Could not parse ver attribute value (major ver): " |
| 69 | + majorStr, |
| 70 | nfx)); |
| 71 | } |
| 72 | if (major < 0) { |
| 73 | throw(new BOSHException( |
| 74 | "Major version may not be < 0")); |
| 75 | } |
| 76 | |
| 77 | String minorStr = val.substring(idx + 1); |
| 78 | try { |
| 79 | minor = Integer.parseInt(minorStr); |
| 80 | } catch (NumberFormatException nfx) { |
| 81 | throw(new BOSHException( |
| 82 | "Could not parse ver attribute value (minor ver): " |
| 83 | + minorStr, |
| 84 | nfx)); |
| 85 | } |
| 86 | if (minor < 0) { |
| 87 | throw(new BOSHException( |
| 88 | "Minor version may not be < 0")); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Get the version of specifcation that we support. |
| 94 | * |
| 95 | * @return max spec version the code supports |
| 96 | */ |
| 97 | static AttrVersion getSupportedVersion() { |
| 98 | return DEFAULT; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Creates a new attribute instance from the provided String. |
| 103 | * |
| 104 | * @param str string representation of the attribute |
| 105 | * @return attribute instance or {@code null} if provided string is |
| 106 | * {@code null} |
| 107 | * @throws BOSHException on parse or validation failure |
| 108 | */ |
| 109 | static AttrVersion createFromString(final String str) |
| 110 | throws BOSHException { |
| 111 | if (str == null) { |
| 112 | return null; |
| 113 | } else { |
| 114 | return new AttrVersion(str); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Returns the 'major' portion of the version number. |
| 120 | * |
| 121 | * @return major digits only |
| 122 | */ |
| 123 | int getMajor() { |
| 124 | return major; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Returns the 'minor' portion of the version number. |
| 129 | * |
| 130 | * @return minor digits only |
| 131 | */ |
| 132 | int getMinor() { |
| 133 | return minor; |
| 134 | } |
| 135 | |
| 136 | /////////////////////////////////////////////////////////////////////////// |
| 137 | // Comparable interface: |
| 138 | |
| 139 | /** |
| 140 | * {@inheritDoc} |
| 141 | * |
| 142 | * @param otherObj object to compare to |
| 143 | * @return -1, 0, or 1 |
| 144 | */ |
| 145 | @Override |
| 146 | public int compareTo(final Object otherObj) { |
| 147 | if (otherObj instanceof AttrVersion) { |
| 148 | AttrVersion other = (AttrVersion) otherObj; |
| 149 | if (major < other.major) { |
| 150 | return -1; |
| 151 | } else if (major > other.major) { |
| 152 | return 1; |
| 153 | } else if (minor < other.minor) { |
| 154 | return -1; |
| 155 | } else if (minor > other.minor) { |
| 156 | return 1; |
| 157 | } else { |
| 158 | return 0; |
| 159 | } |
| 160 | } else { |
| 161 | return 0; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | } |