How to generate self closing XML elements using Apache Velocity template, if the value is null or empty

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Is there any shorter way to generate xml elements using Apache Velocity, with elements with self closing tags if the value is null or empty.

However this can be achieved by putting - #if #else #end. but I need some shorter way to do this as I need to use it multiple places in template.

            #if( $stu.libno )
                <libno>$stu.libno</libno>
            #else
                <libno />
            #end
apache-velocity velocity xml apache java
1 Answers

It seems a good use case for a macro:

#macro( optionalTag $tagName $value )
  #if( $value )
    <$tagName>$value</$tagName>
  #else
    <$tagName/>
  #end
#end

which you can define at the beginning of your templates, or in the shared global macro library file. Then, you can do:

#optionalTag( 'libno', $stu.libno )
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