source: fedd/abac-src/ttg/process/EdgeOperation.java @ bd3e314

package com.nailabs.abac.process;

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

public abstract class EdgeOperation implements Operation {
    /** the parent node of the edge (beginning point) */
    private Goal parent;

    /** the child node of the edge (end point) */
    private Goal child;

    private transient HashSet evidence;

    protected String type;

    protected ProcessingState state; 

    public EdgeOperation(Goal p, Goal c, ProcessingState s, HashSet list) {
        parent = p;
        child = c;
        evidence = list;
        state = s;
    }

    
    /** Constructor method  to make XML processing easier */
    public EdgeOperation() {
        parent = null;
        child = null;
        evidence = null;
        state = null;
    }
    
    /** 
     * Modifier method for the setting the parent node of an edge.
     * Added this method to make XML processing easier 
     */
    public void setParent(Goal p) { parent = p; }
    
    /** 
     * Modifier method for setting the child node of an edge.
     * Added this method to make XML processing easier 
     */
    public void setChild(Goal c) { child = c; }
    
    /** 
     * Modifier method for setting the processing state of the child node. 
     * Added this method to make XML processing easier 
     */
    public void setProcessingState(ProcessingState s) { state = s; }

    public final boolean hasNewChild() { return (state != null); }

    public final void perform(TTG graph) {
        if(hasNewChild())
            performNewAdditional(graph);
        else
            performAdditional(graph);
    }

    public Goal getParent() { return parent; }

    public Goal getChild() { return child; }

    public String getType() { return type; }

    public ProcessingState getProcessingState() { return state; }

    public HashSet getEvidence() { return evidence; }

    public void setEvidence(HashSet set) { evidence = set; }

    public abstract void performAdditional(TTG graph);
    
    public abstract void performNewAdditional(TTG graph);

    protected String performNewInfo() {
        StringBuffer buff = new StringBuffer("adding new child for ");
        buff.append(getChild().toString());
        return buff.toString();
    }

    public String toXML() {
        return toXML("");
    }

    protected String toXML(String args) {
        StringBuffer buff = new StringBuffer("<EdgeOperation type=\"");
        buff.append(type).append("\" newChild=\"");
        buff.append(hasNewChild()).append("\"");
        buff.append(args);
        buff.append(">\n");
        if(getParent() != null) {
            buff.append("<Parent>\n");
            buff.append(getParent().toXML());
            buff.append("</Parent>\n");
        }
        if(getChild() != null) {
            buff.append("<Child>\n");
            buff.append(getChild().toXML());
            buff.append("</Child>\n");
        }
        if(state != null) 
            buff.append(state.toXML());
        //if(evidence != null) {
        if(false) {
            int count = 0;
            Iterator i = evidence.iterator();
            StringBuffer creds = new StringBuffer();
            for(count = 0;i.hasNext();count++) {
                try {
                    StaticCredential cred = (StaticCredential)i.next();
                    //creds.append("<Credential>");
                    //creds.append(cred.toXML());
                    //creds.append("</Credential>\n");
                }
                catch(Exception ex) {
                    //ex.printStackTrace();
                }
                if(count > 0) {
                    //buff.append("<Evidence count=\"").append(++count);
                    //buff.append("\">\n");
                    //buff.append(creds.toString());
                    //buff.append("</Evidence>\n");
                }
            }
        }
        buff.append("</EdgeOperation>\n");
        return buff.toString();
    }

    /** convert this edge into a human-readable formatted String */
    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();
    }

}