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Workflow GetNextActivityDefinition

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To continue my series of Workflow utility methods, today I'm presenting a way to retrieve the next Activity Definition, relative to the current Activity in the Workflow Process.

/// <summary>
/// Return the next activity definition, if there is one.
/// </summary>
/// <returns></returns>
protected ActivityDefinition GetNextActivityDefinition() {
    ActivityInstance activityInstance = CurrentWorkItem.Activity as ActivityInstance;
    TridionActivityDefinition activityDefinition = activityInstance.ActivityDefinition as TridionActivityDefinition;
    ProcessDefinition processDefinition = activityDefinition.ProcessDefinition;
    IList<ActivityDefinition> activityDefinitions = new List<ActivityDefinition>(processDefinition.ActivityDefinitions);
    IList<TridionActivityDefinition> nextActivities = null;
    foreach (TridionActivityDefinition tridionActivityDefinition in activityDefinitions) {
        if (tridionActivityDefinition.Id.Equals(activityDefinition.Id)) {
            nextActivities = tridionActivityDefinition.NextActivityDefinitions;
            if (nextActivities == null || nextActivities.Count == 0) {
                Logger.Warn("GetNextActivityDefinition: Current Activity does not have a next Activity. It is the last one.");
            } else if (nextActivities.Count > 1) {
                Logger.Warn("GetNextActivityDefinition: Current Activity is a decision. It has more than 1 next Activity.");
            } else {
                return nextActivities[0];
            }
        }
    }

    return null;
}

Alternatively, you can retrieve a next ActivityDefinition by name, where name is the ActivityDefinition title that we are looking for:

/// <summary>
/// Return the next activity definition by name, if there is one.
/// </summary>
/// <returns></returns>
protected ActivityDefinition GetNextActivityDefinition(String name) {
    ActivityInstance activityInstance = CurrentWorkItem.Activity as ActivityInstance;
    TridionActivityDefinition activityDefinition = activityInstance.ActivityDefinition as TridionActivityDefinition;
    IList<TridionActivityDefinition> nextActivities = activityDefinition.NextActivityDefinitions;

    if (nextActivities == null) {
        Logger.Warn("GetNextActivityDefinition: Current Activity does not have a next Activity. It is the last one.");
    } else {
        foreach (ActivityDefinition activity in nextActivities) {
            if (activity.Title.Equals(name)) {
                Logger.Debug("GetNextActivityDefinition: Found activity " + activity + " by name.");
                return activity;
            }
        }
    }

    Logger.Warn("GetNextActivityDefinition: Cannot find next Activity by name.");
    return null;
}

For the code-above we need to know the CurrentWorkItem, which is the WorkItem of the current item in the workflow.

The code above is part of YAWF (Yet Another Workflow Framework).

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