Class Version

Object
Version
All Implemented Interfaces:
Serializable, Char­Sequence, Comparable<Version>
public class Version extends Object implements CharSequence, Comparable<Version>, Serializable
Holds a version number as a sequence of strings separated by either a dot or a dash. The first three strings, usually numbers, are called respectively major, minor and revision. For example, a version code such as "6.11.2" will have major number 6, minor number 11 and revision number 2. Alternatively, a version code such as "3.18-SNAPSHOT" will have major version number 3, minor version number 18 and revision string "SNAPSHOT".

This class provides methods for performing comparisons of Version objects where major, minor and revision parts are compared as numbers when possible, or as strings otherwise.

Immutability and thread safety

This class is immutable and thus inherently thread-safe. Subclasses may or may not be immutable, at implementation choice. But implementers are encouraged to make sure that subclasses remain immutable for more predictable behavior.
Since:
0.3
See Also:

  • Field Details

    • SIS

      public static final Version SIS
      The version of this Apache SIS distribution.

  • Constructor Details

    • Version

      public Version(String version)
      Creates a new version object from the supplied string.
      Parameters:
      version - the version as a string.

  • Method Details

    • ofLibrary

      public static Optional<Version> ofLibrary(Class<?> member)
      Returns the version of the library that provides the given class. This method reads the "Implementation-Version" attribute of the META-INF/MANIFEST​.MF file of the JAR file that contains the given class.
      Parameters:
      member - any public class of the library for which to get the version.
      Returns:
      version declared by the library that provides the given class.
      Since:
      1.5
      See Also:

    • valueOf

      public static Version valueOf(int... components)
      Returns an instance for the given integer values. The components array must contain at least 1 element, where:
      • The first element is the major number.
      • The second element (if any) is the minor number.
      • The third element (if any) is the revision number.
      • Other elements (if any) will be appended to the string value.
      Parameters:
      components - the major number, optionally followed by minor, revision or other numbers.
      Returns:
      a new or existing instance of Version for the given numbers.
      Since:
      0.4

    • getMajor

      public Comparable<?> getMajor()
      Returns the major version number. This method returns an Integer if possible, or a String otherwise.
      Returns:
      the major version number.

    • getMinor

      public Comparable<?> getMinor()
      Returns the minor version number. This method returns an Integer if possible, or a String otherwise. If there is no minor version number, then this method returns null.
      Returns:
      the minor version number, or null if none.

    • getRevision

      public Comparable<?> getRevision()
      Returns the revision number. This method returns an Integer if possible, or a String otherwise. If there is no revision number, then this method returns null.
      Returns:
      the revision number, or null if none.

    • compareTo

      public int compareTo(Version other, int limit)
      Compares this version with another version object, up to the specified limit. A limit of 1 compares only the major version number. A limit of 2 compares the major and minor version numbers, etc. The comparisons are performed as Integer object if possible, or as String otherwise.
      Parameters:
      other - the other version object to compare with.
      limit - the maximum number of components to compare.
      Returns:
      a negative value if this version is lower than the supplied version, a positive value if it is higher, or 0 if they are equal.

    • compareTo

      public int compareTo(Version other)
      Compares this version with another version object. This method performs the same comparison than compare­To(Version, int) with no limit.
      Specified by:
      compare­To in interface Comparable<Version>
      Parameters:
      other - the other version object to compare with.
      Returns:
      a negative value if this version is lower than the supplied version, a positive value if it is higher, or 0 if they are equal.

    • equals

      public boolean equals(Object other)
      Compares this version string with the specified object for equality. Two version are considered equal if compare­To(other) == 0.
      Overrides:
      equals in class Object
      Parameters:
      other - the object to compare with this version for equality.

    • length

      public int length()
      Returns the length of the version string.
      Specified by:
      length in interface Char­Sequence

    • charAt

      public char charAt(int index)
      Returns the char value at the specified index.
      Specified by:
      char­At in interface Char­Sequence

    • subSequence

      public CharSequence subSequence(int start, int end)
      Returns a new version string that is a subsequence of this sequence.
      Specified by:
      sub­Sequence in interface Char­Sequence

    • toString

      public String toString()
      Returns the version string. This is the string specified at construction time.
      Specified by:
      to­String in interface Char­Sequence
      Overrides:
      to­String in class Object

    • hashCode

      public int hashCode()
      Returns a hash code value for this version.
      Overrides:
      hash­Code in class Object