wso2esb - How to concatenate JSON array values in WSO2 ESB? -

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we have json object below, expected result in: "(001),(011),(089),(120)".

can suggest how iterate json array , concat values mention ."(001),(011),(089),(120)"

thanks in advance.

{     "element": {         "values": {             "agentid": "aaaaa",             "transactiondata": [                 {                     "no": "001"                 },                 {                     "no": "011"                 },                 {                     "no": "089"                 },                 {                     "no": "120"                 }             ]         }     } }

you can using iterate mediator, filter mediator , properties operation scope. try solution. @ end have (001),(011),(089),(120) value in concat-data property. have added complete proxy reference. 

<?xml version="1.0" encoding="utf-8"?> <proxy xmlns="http://ws.apache.org/ns/synapse"        name="stockquoteproxy"        transports="https,http"        statistics="disable"        trace="disable"        startonload="true">    <target>       <insequence>          <payloadfactory media-type="json">             <format> {     "element": {         "values": {             "agentid": "aaaaa",             "transactiondata": [                 {                     "no": "001"                 },                 {                     "no": "011"                 },                 {                     "no": "089"                 },                 {                     "no": "120"                 }             ]         }     } } </format>             <args/>          </payloadfactory>          <iterate continueparent="true"                   expression="//element/values/transactiondata"                   sequential="true">             <target>                <sequence>                   <property name="data"                             expression="json-eval($.transactiondata.no)"                             type="string"/>                   <filter source="boolean(get-property('operation','concat-data'))" regex="false">                      <then>                         <property name="concat-data"                                   expression="fn:concat('(',get-property('data'),')')"                                   scope="operation"                                   type="string"/>                      </then>                      <else>                         <property name="concat-data"                                   expression="fn:concat(get-property('operation','concat-data'),',','(',get-property('data'),')')"                                   scope="operation"                                   type="string"/>                      </else>                   </filter>                </sequence>             </target>          </iterate>          <log level="custom">             <property name="con-cat-data"                       expression="get-property('operation','concat-data')"/>          </log>       </insequence>       <outsequence>          <send/>       </outsequence>    </target>    <publishwsdl uri="file:repository/samples/resources/proxy/sample_proxy_1.wsdl"/>    <description/> </proxy>

payload factory mediator used simulate scenario. if client sends json payload, don't need have payload factory mediator.

filter mediator used omit leading comma character. if not use filter, ,(001),(011),(089),(120) result (note leading comma character). of course, there can other ways remove leading comma character.

refer this more details on properties operation scope.


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