Hi all,

I'd like to commit a new velocity tool to help producing JSON from 
velocity. It's mainly a wrapper around the json-lib library 
(http://json-lib.sourceforge.net/).

For a first version, I propose the 2 following APIs :

public JSON toJSON(Object object)
public String toValueString(String value)

The first one should become a privileged way of producing JSON from 
velocity. It allows to easily write a JSON-valid String from java beans 
and/or maps. See http://json-lib.sourceforge.net/usage.html#objects for 
more information of what it makes possible. Note that JSON#toString 
actually writes down the valid JSON, so in velocity we just have to do : 
$jsontool.toJSON($object)

The second API is a helper to produce a JSON-valid value String from a 
java String (it escapes properly quotes).

I've pasted the proposed implementation at 
http://incubator.myxwiki.org/xwiki/bin/view/Main/VelocityJsonToolProposal

As a bonus, this will make the JSON groovy builder 
(http://json-lib.sourceforge.net/apidocs/jdk15/net/sf/json/groovy/JsonGroovyBuilder.html)
 
and the JSONSlurper 
(http://json-lib.sourceforge.net/apidocs/jdk15/net/sf/json/groovy/JsonSlurper.html)
 
available for groovy scripting.

If you agree I would like to commit it in branch 2.0 as well, as this is 
the clean way of fixing some issues with the livetable. (For example : 
http://jira.xwiki.org/jira/browse/XWIKI-4282).

My +1 for the tool,

Thanks,
Jerome.
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