Usage

The CompareVersions condition (type="compareversions") can be used to find out, how two given version strings relate, comparing all version parts of both sides. If one of both operands has a different number of version parts than the second one the missing version parts ar assumed to be 0 for a complete comparison of all parts beginning from the major version part.

For example, when comparing 1.0 and 1.0.1, the CompareVersions condition assumes missing minor version parts to be 0 effectively, thus comparing 1.0 and 1.0.1 would result in comparing 1.0.0 and 1.0.1, thus evaluating 1.0 < 1.0.1.

In comparison, there is implemented a second condition of type "compareversionsmajor" which comparing just the most common denominator of the major version parts of both sides.

Example:

<condition type="compareversions" id="isValidWrapperJavaVersion">
    <arg1>${previous.wrapper.java.version}</arg1>
    <arg2>1.5</arg2>
    <operator>geq</operator>
</condition>

The CompareVersions condition has been introduced in IzPack 5.0.

Nested Elements

arg1

This is a mandatory nested element, defining the left version to compare. Any string is allowed, IzPack will try to resolve it as a version string.

arg2

This is a mandatory nested element, defining the right version to compare. Any string is allowed, IzPack will try to resolve it as a version string.

operator

This is a mandatory nested element, specifying the comparison operation to apply

Allowed values:

• eq - check whether both versions are equal (=)
• ne - check whether both versions differ (not equal) (<>)
• leq - check whether the left version is less than or equal the right version (<=)
• lt - check whether the left version is less than the right version (<)
• geq - check whether the left version is greater than or equal the right version (>=)
• gt - check whether the left version is greater than the right version (>)