How to retrieve and use the setted value of a property in WSO2 ESB?

Question

I am pretty new in WSO2 ESB and I have the following problem trying to retrieve the value of a property and put into an XML document that I am generating.

So, I have the following situation, in my ESB flow I have defined this property named TRANSACTION and having register as value:

<property name="TRANSACTION" scope="default" type="STRING" value="register"/>

Then in my flow I am generating an XML document (it works fine), using a payloadFactory mediator, in this way:

<payloadFactory media-type="xml">
    <format>
        <register password="$14" username="$13" xmlns="http://ws.wso2.org/dataservice">
            <location>
                <wiews>$1</wiews>
                <pid>$2</pid>
                <name>$3</name>
                <address>$4</address>
                <country>$5</country>
                <lat>$6</lat>
                <lon>$7</lon>
            </location>
            <sampledoi>$8</sampledoi>
            <sampleid>$9</sampleid>
            <date>$10</date>
            <method>$11</method>
            <genus>$12</genus>
        </register>
    </format>
    <args>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_wiews/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_pid/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_name/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_address/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_country/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_lat/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:hold_lon/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:sample_doi/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:sample_id/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:date/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:method/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:genus/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:username/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
        <arg evaluator="xml" expression="$ctx:sampleData//ds:Sample/ds:password/text()" xmlns:ds="http://ws.wso2.org/dataservice"/>
    </args>
</payloadFactory>

That genetes an XML document like this:

<?xml version="1.0" encoding="UTF-8" ?>
<register username="myUserName" password="myPswd">
    <sampleid>CGN00001</sampleid>
    <genus>Hordeum2</genus>
    ...................................
    ...................................
    ...................................

I want use the value of my TRANSACTION property to create the name of the first tag of my XML document, in this:

<register password="$14" username="$13" xmlns="http://ws.wso2.org

the register name have to be a $15 variable that use the TRANSACTION property value. I think that I can define it in some way into the ... list but I don't know how. At this time in this list I only have value retrieved from a DSS service output, in this case I think that I have to put the value of my TRANSACTION property, but how?

So, is it possible to something like this:

<$15 password="$14" username="$13" xmlns="http://ws.wso2.org

to dinamically insert the tag name?

Jean-Michel Jean-Michel · Accepted Answer · 2017-05-30T08:54:05

As far as I know, you can't do that with payloadFactory but you can use a default name for your root node and just after payloadFactory mediator, add this javascript :

<script language="js"><![CDATA[
    mc.getEnvelope().getBody().getFirstElement().setLocalName(mc.getProperty("TRANSACTION"));
]]></script>

An other solution would be to use XSLT

How to retrieve and use the setted value of a property in WSO2 ESB?

1 Answers