/**
 * This callback is specific to TreeAgentState
 * and has no UI dependencies.
 * It should not be used with any agent state other then
 * TreeAgentState
 */
public class TreeCallbackTrackMaxDepth implements ISimUICallback
{
    int m_nMaxDepth;
    
    public TreeCallbackTrackMaxDepth() {
	m_nMaxDepth = 0;
    }
    
    public boolean doCallback(double [] arrLfState,
			      IAgent agent,
			      StateBundle [] arrStates,
			      ISensor [] arrSensors,
			      IEnvironment env ,
			      CommGraph graph,
			      double lfSimTime) {
	for(int i = 0; i < arrStates.length; ++i) {
	    TreeAgentState currState = 
		(TreeAgentState)(arrStates[i].getVars());
	    int nDep =
		currState.getDepthEst();
	    
	    Boolean bObjDone1 = currState.getBoolVar(new Integer(0));
	    boolean bDone1 = (bObjDone1 != null) && bObjDone1.booleanValue();
	    if(!bDone1 && nDep > m_nMaxDepth) {
		// track the max depth of any agent which hasn't attached
		// to an ancestor.
		m_nMaxDepth = nDep;
	    }
	}
	return false;
    }
    
    /**
     * In case we need more info then true/false from doCallback
     * @return arbitrary object (meaning depends on derived class)
     */
    public Object getLastObject() {
	return new Integer(m_nMaxDepth);
    }
}