package com.nailabs.abac.process;

import com.nailabs.abac.trust.*;
import edu.stanford.peer.rbtm.credential.*;
import java.util.*;

/**
 * A control edge represents an edge in a trust target graph (<CODE>TTG</CODE>)
 * with the required roles to support this edge. 
 */
public class ControlEdge extends EdgeOperation {
    /** Jared: Added this method to make XML processing easier */
    public ControlEdge() {
        super();
        type = "Control";
    }
    
    public ControlEdge(Goal parent, Goal child, ProcessingState state) {
	super(parent, child, state, null);
	type = "Control";
    }
    
    public void performAdditional(TTG graph) {
	SimpleTTNode parent = (SimpleTTNode)graph.getNodeByHash(getParent());
	TargetNode child = (TargetNode)graph.getNodeByHash(getChild());

	parent.addControlChild(child);
	child.addControlParent(parent);
    }
    
    public void performNewAdditional(TTG graph) {
	TargetNode child = (TargetNode)graph.getNodeByHash(getChild());
	if(child == null) {
	    child = (TargetNode)TTGNode.createNode(getChild());
	    child.getProcessingState().update(state);
	    graph.putNodeByHash(child);
	}
	performAdditional(graph); 
    }

    public String toString() {
	StringBuffer buff = new StringBuffer("[ControlEdge  ");
	buff.append(getParent()).append(" <<=== ");
	buff.append(getChild()).append(", state = ");
	buff.append(state).append("]");
	return buff.toString();
    }
}