package com.nailabs.abac.trust;

import edu.stanford.peer.rbtm.credential.*;
import com.nailabs.abac.process.*;

/** 
 * A trivial trust target node is a leaf node which propagates satisfaction
 * state up towards the root of the graph. 
 */
public class TrivialTTNode extends TargetNode {

    //NegotiationContext context = null;

    /**
     * Create a new trivial trust target node. 
     */
    public TrivialTTNode(Entity v, Entity subject) 
	throws CredentialParsingException, TrustTargetParsingException
    {
	this(new TrustTarget(v, subject, subject)); // set up trust target
    }

    /** Create a new trivial TT node base on the supplied trust target */
    public TrivialTTNode(TrustTarget tt)
    {
        super(tt);                  // set up trust target
        SatisfactionState satisfied = 
            new SatisfactionState(SatisfactionState.SATISFIED);
        subName = "TrivialTarget";
        processor = new ProcessingState(true, true); 
        // node is fully processed when added into a graph
        setState(satisfied);
    }

    //public void init(NegotiationContext context) {
    //this.context = context;
    //receive((TrustTarget)getGoal(), 
    //new SatisfactionState(SatisfactionState.SATISFIED));
    //}

    /** public accessor method for the entity which is target and subject */
    public Entity getEntity() { return (Entity)getSubject(); }

    /** process the node by the verifier of this node's trust target */
    public void verifierProcess(NegotiationContext context) { 
	process();
    }

    /** process the node by the opponent of this node's trust target */
    public void opponentProcess(NegotiationContext context) { 
	process();
    }

    public void addImplicationParent(StandardTTNode parent) {
        setChanged();
        notifyObservers(new SatisfactionState(SatisfactionState.SATISFIED));
        super.addImplicationParent(parent);
    }
	
    /**
     * Propagates satisfied satisfaction state to the parent listeners.
     * @param state The new satisfaction state to be propagated. 
     */
    public  TTGNodeSet receive(TrustTarget src, SatisfactionState state) {
	return super.receive((TrustTarget)getGoal(), 
		      new SatisfactionState(SatisfactionState.SATISFIED));
    }
    
    /** Processing is the same for verifier and opponent. */
    private void process() {
	//int satisfaction = (getSubject().equals(getTargetExpression()))?
	//SatisfactionState.SATISFIED: SatisfactionState.FAILED;
	//receive((TrustTarget)getGoal(), new SatisfactionState(satisfaction));
    }

}