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/*
 *   This sample shows how to handle workItems:
 *   --  It creates a workitem for a specific user
 *   --  It transfers the workItem to another user 
 *   --  It deletes the workItem
 * 
 *   In a first step a staff activity is claimed and the POTENTIAL_OWNER becomes the owner 
 *   of the activity. 
 *   Then the owner of the staff activity adds Smith as READER and EDITOR.
 *   Then the owner transfers the EDITOR workitem from Smith to Miller 
 *   In a last step the system is set to the initial state, i.e.,
 *   the two workitems are deleted and the claim is canceled.
 */


import java.util.TimeZone;

import com.ibm.bpe.api.*;


public class HandleWorkItems 
{

    public static void main(String[] args)
    {

        try
        {
            // initialize context and access the remote interface for the 
            // BusinessFlowManager bean
            BusinessFlowManager bfm = ApiHelper.initializeBFM();

            String processTemplate = "OrderApprovalProcess";

            // get the process instances who's admin is the current user 
            String selectClause = "DISTINCT ACTIVITY.AIID";
            String whereClause  = "ACTIVITY.STATE = ACTIVITY.STATE.STATE_READY AND " + 
                                  "ACTIVITY.KIND  = ACTIVITY.KIND.KIND_STAFF   AND " +
                                  "WORK_ITEM.REASON = WORK_ITEM.REASON.REASON_POTENTIAL_OWNER AND " +
                                  "PROCESS_INSTANCE.STATE = PROCESS_INSTANCE.STATE.STATE_RUNNING AND " +
                                  "PROCESS_TEMPLATE.NAME = '" + processTemplate + "'";   

            QueryResultSet result = bfm.query( selectClause, whereClause, (String)null, (Integer)null, (TimeZone)null );
            System.out.println( "\n > query(), result size: " + result.size());
            if ( result.size() == 0 )
            {
                System.exit(0);
            }
            result.first(); 
            AIID aiid = (AIID)result.getOID(1);
            // Claim the activity 
            ClientObjectWrapper input = bfm.claim( aiid );

            // add 'Smith' as READER and EDITOR for this activity
            bfm.createWorkItem( aiid, WorkItemData.REASON_READER, "Smith");
            bfm.createWorkItem( aiid, WorkItemData.REASON_EDITOR, "Smith");
            System.out.println( " > createWorkItem()  ");

            // transfer this READER-workItem from Smith to Miller
            bfm.transferWorkItem( aiid, WorkItemData.REASON_EDITOR, "Smith", "Miller");
            System.out.println( " > transferWorkItem() ");

            // delete the workitems created   
            bfm.deleteWorkItem( aiid, WorkItemData.REASON_READER, "Smith");
            bfm.deleteWorkItem( aiid, WorkItemData.REASON_EDITOR, "Miller");
            bfm.cancelClaim( aiid );
            System.out.println( " > deleteWorkItem() ");

            System.out.println("\n  successfully processed \n");
            System.exit(0);
        }

        catch ( com.ibm.bpe.api.ProcessException xcpt)
        {
            System.out.println( xcpt );
        } catch (java.rmi.RemoteException xcpt )
        {
            System.out.println( xcpt );
        } finally
        {
            System.exit(0);
        } 
    }
}