package com.nailabs.abac.process;

import com.nailabs.abac.trust.*;
import com.nailabs.abac.test.*;

public class IntersectionEdge extends EdgeOperation {
    
    /** Jared: Added this method to make XML processing easier */
    public IntersectionEdge() {
        super();
        type = new String("Intersection");
    }

    public IntersectionEdge(Goal parent, Goal child, ProcessingState state) {
        super(parent, child, state, null);
        //TBD: add extra type checking--verify child is a part of the and-ing
        type = new String("Intersection");
        Debug.debug("intersection", toString());
    }

    public void performAdditional(TTG graph) {
        IntersectionTTNode parent = 
            (IntersectionTTNode)graph.getNodeByHash(getParent());
        TargetNode child = (TargetNode)graph.getNodeByHash(getChild());

        parent.addIntersectionChild(child);
        child.addImplicationParent(parent);
    }
    
    public void performNewAdditional(TTG graph) {
        TargetNode child = (TargetNode)graph.getNodeByHash(getChild());
        if(child == null) {
            Debug.debug("intersection", "child = " + child);
            child = (TargetNode)TTGNode.createNode(getChild());
            child.getProcessingState().update(state);
            graph.putNodeByHash(child);
        }
        performAdditional(graph); 
    }

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

}