Customize / Override BPM in-build actions like reassign

Question

We have a requirement to override the reassign action in BPM workspace to perform certain checks before allocate to person. Basically when a supervisor is reassigning a task, he can only reassign the task to a member who work under him and also has specific skill (these information maintained in a DB called agent profile) to be performed.
If anyone knows about the steps or any documents, request you to please share with us. We are closing our UAT and this has came as a UAT feedback. We are at the edge of production now, hence the solution is urgent for us.
Thanks in advance,
Rati

Answer 1

Sorry - don't know who wrote this code but hope it is the reassignment logic you are looking for:
/* Copyright (c) 2004, 2009, Oracle and/or its affiliates.
All rights reserved. */
   DESCRIPTION
    Sample that demonstrates how to programatically reassign human workflow task from one assignee to another
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import oracle.bpel.services.workflow.IWorkflowConstants;
import oracle.bpel.services.workflow.WorkflowException;
import oracle.bpel.services.workflow.client.IWorkflowServiceClient;
import oracle.bpel.services.workflow.client.IWorkflowServiceClientConstants;
import oracle.bpel.services.workflow.client.WorkflowServiceClientFactory;
import oracle.bpel.services.workflow.query.ITaskQueryService;
import oracle.bpel.services.workflow.task.ITaskAssignee;
import oracle.bpel.services.workflow.task.ITaskService;
import oracle.bpel.services.workflow.task.impl.TaskAssignee;
import oracle.bpel.services.workflow.task.impl.TaskService;
import oracle.bpel.services.workflow.task.impl.TaskUtil;
import oracle.bpel.services.workflow.task.model.Task;
import oracle.bpel.services.workflow.verification.IWorkflowContext;
public class ReassignTask
    public static void main(String[] args) throws Exception {
        //command line input arguments validation
        if ( args.length != 6 ) {
            System.out.print("Usage: java ReassignTask protocol(SOAP/REMOTE) fromUser(jcooper) fromUserPassword(welcome1) taskId toUser(jstein) type(user/group/application_role)");
            return;
        String type = args[5];
        if (!((type.equals(IWorkflowConstants.IDENTITY_TYPE_USER)) ||
              type.equals(IWorkflowConstants.IDENTITY_TYPE_GROUP) ||
              type.equals(IWorkflowConstants.IDENTITY_TYPE_APPLICATION_ROLE))) {
            throw new Exception("Type has to be user or group or application_role");
        reassignTask(args[0], args[1], args[2], args[3], args[4], args[5]);
    public static void reassignTask(String protocol, String fromUser, String fromUserPassword, String taskId, String toUser, String type)
        throws Exception {
        System.out.println("Using the protocol " + protocol + " for reassigning the task " + taskId + " from " + fromUser + " with password " + fromUserPassword + " to " + toUser + " of type " + type + " ..... ");
        Map<IWorkflowServiceClientConstants.CONNECTION_PROPERTY, String> map =
            new HashMap<IWorkflowServiceClientConstants.CONNECTION_PROPERTY, String>();
        // get Human Workflow client
        IWorkflowServiceClient wfSvcClient = WorkflowServiceClientFactory.getWorkflowServiceClient(protocol, map, Util.getLogger());
        ITaskQueryService querySvc = wfSvcClient.getTaskQueryService();
        IWorkflowContext fromUserCtx = querySvc.authenticate(fromUser, fromUserPassword.toCharArray(), "jazn.com");
        Task task = querySvc.getTaskDetailsById(fromUserCtx, taskId);
        ITaskAssignee toUserAssignee = new TaskAssignee(toUser, type);
        List l = new ArrayList();
        l.add(toUserAssignee);
        ITaskService taskSvc = wfSvcClient.getTaskService();
        Task reassignedTask = taskSvc.reassignTask(fromUserCtx, taskId, l);
        System.out.println("Task was re-assigned successfully from " + fromUser + " to " + toUser);