| 1 | package be.nikiroo.utils; |
| 2 | |
| 3 | import java.io.ByteArrayOutputStream; |
| 4 | import java.io.IOException; |
| 5 | import java.io.InputStream; |
| 6 | |
| 7 | /** |
| 8 | * This class describe a program {@link Version}. |
| 9 | * |
| 10 | * @author niki |
| 11 | */ |
| 12 | public class Version implements Comparable<Version> { |
| 13 | private String version; |
| 14 | private int major; |
| 15 | private int minor; |
| 16 | private int patch; |
| 17 | |
| 18 | /** |
| 19 | * Create a new, empty {@link Version}. |
| 20 | * |
| 21 | */ |
| 22 | public Version() { |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * Create a new {@link Version} with the given values. |
| 27 | * |
| 28 | * @param major |
| 29 | * the major version |
| 30 | * @param minor |
| 31 | * the minor version |
| 32 | * @param patch |
| 33 | * the patch version |
| 34 | */ |
| 35 | public Version(int major, int minor, int patch) { |
| 36 | this.major = major; |
| 37 | this.minor = minor; |
| 38 | this.patch = patch; |
| 39 | this.version = String.format("%d.%d.%d", major, minor, patch); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Create a new {@link Version} with the given value, which must be in the |
| 44 | * form <tt>MAJOR.MINOR.PATCH</tt>. |
| 45 | * |
| 46 | * @param version |
| 47 | * the version (<tt>MAJOR.MINOR.PATCH</tt>) |
| 48 | */ |
| 49 | public Version(String version) { |
| 50 | try { |
| 51 | String[] tab = version.split("\\."); |
| 52 | this.major = Integer.parseInt(tab[0]); |
| 53 | this.minor = Integer.parseInt(tab[1]); |
| 54 | this.patch = Integer.parseInt(tab[2]); |
| 55 | this.version = version; |
| 56 | } catch (Exception e) { |
| 57 | this.major = 0; |
| 58 | this.minor = 0; |
| 59 | this.patch = 0; |
| 60 | this.version = null; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * The 'major' version. |
| 66 | * <p> |
| 67 | * This version should only change when API-incompatible changes are made to |
| 68 | * the program. |
| 69 | * |
| 70 | * @return the major version |
| 71 | */ |
| 72 | public int getMajor() { |
| 73 | return major; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * The 'minor' version. |
| 78 | * <p> |
| 79 | * This version should only change when new, backwards-compatible |
| 80 | * functionality has been added to the program. |
| 81 | * |
| 82 | * @return the minor version |
| 83 | */ |
| 84 | public int getMinor() { |
| 85 | return minor; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * The 'patch' version. |
| 90 | * <p> |
| 91 | * This version should change when backwards-compatible bugfixes have been |
| 92 | * added to the program. |
| 93 | * |
| 94 | * @return the patch version |
| 95 | */ |
| 96 | public int getPatch() { |
| 97 | return patch; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Check if this {@link Version} is "empty" (i.e., the version was not |
| 102 | * parse-able or not given). |
| 103 | * <p> |
| 104 | * An empty {@link Version} is always <tt>0.0.0</tt>. |
| 105 | * |
| 106 | * @return TRUE if it is empty |
| 107 | */ |
| 108 | public boolean isEmpty() { |
| 109 | return major == 0 && minor == 0 && patch == 0; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Check if we are more recent than the given {@link Version}. |
| 114 | * |
| 115 | * @param o |
| 116 | * the other {@link Version} |
| 117 | * @return TRUE if this {@link Version} is more recent than the given one |
| 118 | */ |
| 119 | public boolean isNewerThan(Version o) { |
| 120 | if (major > o.major) { |
| 121 | return true; |
| 122 | } |
| 123 | |
| 124 | if (major == o.major && minor > o.minor) { |
| 125 | return true; |
| 126 | } |
| 127 | |
| 128 | if (major == o.major && minor == o.minor && patch > o.patch) { |
| 129 | return true; |
| 130 | } |
| 131 | |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Check if we are older than the given {@link Version}. |
| 137 | * |
| 138 | * @param o |
| 139 | * the other {@link Version} |
| 140 | * @return TRUE if this {@link Version} is older than the given one |
| 141 | */ |
| 142 | public boolean isOlderThan(Version o) { |
| 143 | return !equals(o) && !isNewerThan(o); |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Return the version of the running program if it follows the VERSION |
| 148 | * convention (i.e., if it has a file called VERSION containing the version |
| 149 | * as a {@link String} in its binary root, and if this {@link String} |
| 150 | * follows the Major/Minor/Patch convention). |
| 151 | * <p> |
| 152 | * If it does not, return an empty {@link Version} object. |
| 153 | * |
| 154 | * @return the {@link Version} of the program, or an empty {@link Version} |
| 155 | * (does not return NULL) |
| 156 | */ |
| 157 | public static Version getCurrentVersion() { |
| 158 | String version = null; |
| 159 | |
| 160 | InputStream in = IOUtils.openResource("VERSION"); |
| 161 | if (in != null) { |
| 162 | try { |
| 163 | ByteArrayOutputStream ba = new ByteArrayOutputStream(); |
| 164 | IOUtils.write(in, ba); |
| 165 | in.close(); |
| 166 | |
| 167 | version = ba.toString("UTF-8").trim(); |
| 168 | } catch (IOException e) { |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | return new Version(version); |
| 173 | } |
| 174 | |
| 175 | public int compareTo(Version o) { |
| 176 | if (equals(o)) { |
| 177 | return 0; |
| 178 | } else if (isNewerThan(o)) { |
| 179 | return 1; |
| 180 | } else { |
| 181 | return -1; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | @Override |
| 186 | public boolean equals(Object obj) { |
| 187 | if (obj instanceof Version) { |
| 188 | Version o = (Version) obj; |
| 189 | return o.major == major && o.minor == minor && o.patch == patch; |
| 190 | } |
| 191 | |
| 192 | return false; |
| 193 | } |
| 194 | |
| 195 | @Override |
| 196 | public int hashCode() { |
| 197 | return version == null ? 0 : version.hashCode(); |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Return a user-readable form of this {@link Version}. |
| 202 | */ |
| 203 | @Override |
| 204 | public String toString() { |
| 205 | return version == null ? "[unknown]" : version; |
| 206 | } |
| 207 | } |