source: fedd/abac-src/ttg/process/ImplicationEdge.java @ 79b6596

package com.nailabs.abac.process;

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

/**
 * An implication edge represents an edge in a trust target graph 
 * (<CODE>TTG</CODE>) with accompanying evidence. An implication edge 
 * is proved by a set of credentials (i.e. a chain).
 */
public class ImplicationEdge extends EdgeOperation {
    
    /** Jared: Added this method to make XML processing easier */
    public ImplicationEdge() {
        super();
        type = new String("Implication");
    }
    
    /** 
     * Default constructor 
     * @param parent an upcast StandardTTNode
     * @param child an upcast TargetNode
     */
    public ImplicationEdge(Goal parent, Goal child, ProcessingState state,
                           HashSet evidence) {
        super(parent, child, state, evidence);
        type = new String("Implication");
        debug("edge", "state = " + state );
    }

    public void performAdditional(TTG graph) {
        StandardTTNode parent=(StandardTTNode)graph.getNodeByHash(getParent());
        TargetNode child = (TargetNode)graph.getNode(getChild());
        debug("perform", "performing " + toString(parent, child));
        parent.addImplicationChild(child);
        child.addImplicationParent(parent);
        //propagate satisfaction for all nodes
        int satisfaction = child.getSatisfactionValue();
        debug("perform",  "child is satified =  " + 
                           (satisfaction == SatisfactionState.SATISFIED));
        //if(child instanceof TrivialTTNode)
        //parent.receive((TrustTarget)child.getGoal(),
        //new SatisfactionState(satisfaction)); 
    }

    public void performNewAdditional(TTG graph) {
        TTGNode child = graph.getNodeByHash(getChild());
        if(child == null) {
            child = TTGNode.createNode(getChild());
            debug("newop", performNewInfo());
            // set processing if necessary here
            if(state != null) {
                child.getProcessingState().update(state);
            } else {
                debug("newop", "warning perform new additional has no state");
            }
            graph.putNodeByHash(child);
        }
        performAdditional(graph);
    }
    
    /** Friendly debugging convenience method */
    protected void debug(String level, String message) {
        StringBuffer buff = new StringBuffer("ImplicationEdge: ");
        buff.append(message);
        Debug.debug(level, buff.toString());
    }


    public String toString(StandardTTNode parent, TargetNode child) {
        StringBuffer buff = new StringBuffer("[ImplicationEdge  ");
        buff.append(parent).append(" <<=== ");
        buff.append(child);
        return buff.toString();
    }

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

}