Hint of the day #2 : Creating a Map or Seq. with Freemarker

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zomurn

This example enumerate all the associations of the root node "person".
Each association value is a nodeRef to a node of type cmerson
Hence, this freemarker script list the usernames associated with the current person : allow to represent a human hierarchy inside a company.

In two steps :

1) Create the Map "as string"
2) Cast the string to a Map object with the instruction :

<#assign map = mapAsString?eval/>‍

3) Test for NON existence of a key in the map :

<#if !map["keynotexist"]??>‍

<#assign mapAsString = "{"/>
<#assign first = true />
<#list person.assocs["cm:subscribedBy"] as subscriber>
&nbsp;&nbsp;&nbsp; <#if first = false>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <#assign mapAsString = mapAsString + ","/>
&nbsp;&nbsp;&nbsp; </#if>
&nbsp;&nbsp;&nbsp; <#assign mapAsString = mapAsString + "\"" + subscriber.properties["userName"] + "\":" + "\"" + subscriber.properties["userName"] + "\""/>
&nbsp;&nbsp;&nbsp; <#assign first = false/>
</#list>
<#assign mapAsString = mapAsString + "}"/>
 
<#assign map = mapAsString?eval/>
<p><i>map size: ${map?size}</i></p>
<#assign keys = map?keys>
<#list keys as key>
&nbsp;&nbsp;&nbsp;${key} = ${map[key]}
</#list> 
<#if !map["keynotexist"]??>
&nbsp;&nbsp;&nbsp;<p><i>key not found</i></p>
<#else>
&nbsp;&nbsp;&nbsp;<p><i>key found</i></p>
</#if>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

If you want a sequence, just build the String. For example "[value1,value2,…]" and then call "eval" like above.
And then do traverse like in the freemarker doc reference :  http://www.freemarker.org/docs/ref_builtins_hash.html

PS : according to the freemarker doc reference order may be maintained in the map. So I'am quite suspicious that behind this is a real java map…So it means that Map and Sequence in Freemarker looks to be the same java underlying data structure : a List, because they maintained the order both.

Hoping it might help someone (this hints in missing in the wiki)

mrogers

Please go ahead add your examples and hints to the wiki if you realise something is missing.