Custom Process Step

A custom process step was implemented to populate Array List workflow variables. If you are not familiar with creating OSGi bundle, please follow these instructions

The code in the custom process step does the following

  • Query for all the adaptive form attachments under the payload folder. Folder name is passed as a process argument to the process step.

  • Populate listOfDocuments workflow variable

  • Populate attachmentNames workflow variable

  • Set the value of workflow variable (no_of_attachments)


 package com.aemforms.formattachments.core;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.jcr.Node;
import javax.jcr.Session;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.adobe.aemfd.docmanager.Document;
import com.adobe.granite.workflow.WorkflowException;
import com.adobe.granite.workflow.WorkflowSession;
import com.adobe.granite.workflow.exec.WorkItem;
import com.adobe.granite.workflow.exec.WorkflowProcess;
import com.adobe.granite.workflow.metadata.MetaDataMap;
import com.day.cq.search.PredicateGroup;
import com.day.cq.search.Query;
import com.day.cq.search.QueryBuilder;
import com.day.cq.search.result.Hit;
import com.day.cq.search.result.SearchResult;

@Component(property = {
        Constants.SERVICE_DESCRIPTION + "=PopulateListOfDocuments",
        "process.label" + "=PopulateListOfDocuments"
})

public class PopulateListOfDocuments implements WorkflowProcess {

        private static final Logger log = LoggerFactory.getLogger(PopulateListOfDocuments.class);
        @Reference
        QueryBuilder queryBuilder;

        @Override
        public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap processArguments) throws WorkflowException
        {
                String payloadPath = workItem.getWorkflowData().getPayload().toString();
                log.debug("The payload path  is" + payloadPath);
                MetaDataMap metaDataMap = workItem.getWorkflow().getWorkflowData().getMetaDataMap();
                Session session = workflowSession.adaptTo(Session.class);
                Map < String, String > map = new HashMap < String, String > ();
                map.put("path", workItem.getWorkflowData().getPayload().toString() + "/" + processArguments.get("PROCESS_ARGS", "string").toString());
                map.put("type", "nt:file");
                Query query = queryBuilder.createQuery(PredicateGroup.create(map), workflowSession.adaptTo(Session.class));
                query.setStart(0);
                query.setHitsPerPage(20);
                SearchResult result = query.getResult();
                log.debug("Get result hits " + result.getHits().size());
                int no_of_attachments = result.getHits().size();
                Document[] listOfDocuments = new Document[no_of_attachments];
                String[] attachmentNames = new String[no_of_attachments];
                int i = 0;
                for (Hit hit: result.getHits()) {
                        try {
                                String attachmentPath = hit.getPath();
                                log.debug("The hit path is" + hit.getPath());
                                Node attachmentNode = session.getNode(attachmentPath + "/jcr:content");
                                InputStream attachmentStream = attachmentNode.getProperty("jcr:data").getBinary().getStream();
                                listOfDocuments[i] = new Document(attachmentStream);
                                attachmentNames[i] = new String(hit.getTitle());
                                log.debug("Added " + hit.getTitle() + "to the list");
                                i++;
                        } catch (Exception e) {
                                log.error("Unable to obtain attachment", e);
                        }
                }

                metaDataMap.put("no_of_attachments", no_of_attachments);
                metaDataMap.put("listOfDocuments", listOfDocuments);
                metaDataMap.put("attachmentNames", attachmentNames);

                log.debug("Updated workflow");
        }

}
NOTE

Please make sure you have the following variables defined in your workflow for the code to work
listOfDocuments - variable of type ArrayList of Documents
attachmentNames - variable of type ArrayList of String
no_of_attachments - variable of type Double

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