CODEWITHSUNDEEP
javafreemarker
Stephane Grenier
Stephane Grenier

Reputation: 15927

How to total currencies in FreeMarker?

How can I tabulate data in FreeMarker while still keeping precision and not losing cents due to double of float reprensations? 

<#assign totalSalaries = 0>

<#list employees as employee>
    <#assign totalSalaries = totalSalaries + emplpoyee.salary>
</#list>

${totalSalaries?string.currency}

Personally, I prefer to use longs and keep everything in cents but I couldn't find an easy solution to convert that to a currency value. Either way, if I'm using long or BigDecimal (it's easy to convert long with cents to BigDecimal) how can I guarantee that the total salaries printed out won't lose any cents due to precision errors of doubles or floats? In other words, how does FreeMarker decide what type of variable total is defined as?

Upvotes: 0

Views: 610

Answers (1)

ddekany
ddekany

Reputation: 31122

FreeMarker does calculations (and the numerical type conversions needed as part of that) with the ArithmeticEngine, which is a configuration setting. The default of that setting is BigDecimalEngine, which converts everything to BigDecimal before doing anything with them, and keeps the results as BigDecimal as well. So at least with the default you won't lose any digits.

Upvotes: 2

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