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java.lang.Objectimagescience.utility.VersionChecker
public class VersionChecker
Compares version strings. The strings are assumed to be of the form P.S.T.Q, where P, S, T, and Q are integers representing the primary, secondary, tertiary, and quaternary version numbers, respectively, separated by a period. Rather than comparing the strings lexicographically, this class compares the values of P, S, T, and Q as integers, in that order. This allows any of them to be outside the range 0...9
and still compare properly. If any of them are missing, or do not represent an integer value, they default to 0
. Version strings are allowed to have an extra period followed by additional version information, for example P.S.T.Q.beta, but that information is ignored.
Constructor Summary | |
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VersionChecker()
Default constructor. |
Method Summary | |
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static int |
compare(java.lang.String v1,
java.lang.String v2)
Indicates how the given version strings compare to each other. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public VersionChecker()
Method Detail |
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public static int compare(java.lang.String v1, java.lang.String v2)
v1
- The first version string.v2
- The second version string.
v1
compares to v2
:-1
means v1
is smaller (older) than v2
.0
means v1
is equal to v2
.1
means v1
is larger (newer) than v2
.
java.lang.NullPointerException
- If v1
or v2
is null
.
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Copyright (C) Erik Meijering. Permission to use this software and corresponding documentation for educational, research, and not-for-profit purposes, without a fee and without a signed licensing agreement, is granted, subject to the following terms and conditions.
IT IS NOT ALLOWED TO REDISTRIBUTE, SELL, OR LEASE THIS SOFTWARE, OR DERIVATIVE WORKS THEREOF, WITHOUT PERMISSION IN WRITING FROM THE COPYRIGHT HOLDER. THE COPYRIGHT HOLDER IS FREE TO MAKE VERSIONS OF THE SOFTWARE AVAILABLE FOR A FEE OR COMMERCIALLY ONLY.
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