package com.nailabs.abac.trust;

import java.util.*;

/** Simple structure for representing the completion state of a linking goal */
public class CompletionState extends Observable {
    /** 
     * A node is complete when all of its children have either succeeded 
     * or failed completion states (one state per linking solution child).
     * @see SatisfactionState.SATISFIED     
     * @see SatisfactionState.FAILED
     * */
    public static final String COMPLETE = "complete";

    /**
     * A node is complete while any of its linking solution children have an
     * unknown satisfaction state. 
     * @see SatisfactionState.UNKNOWN
     */
    public static final String INCOMPLETE = "incomplete";


    /** encapsulated completion state */
    private String state = INCOMPLETE;

    /** default constructor */
    public CompletionState() { }

    /** explicit state constructor */
    public CompletionState(boolean flag) { 
        state = (flag)? COMPLETE: INCOMPLETE; 
    }

    /** accessor method for the completion state field */
    public boolean isComplete() { return state.equals(COMPLETE); }

    /** modifier method for the completion state field */
    public void setComplete(boolean flag) { 
        state = (flag)? COMPLETE: INCOMPLETE; 
        setChanged();
        notifyObservers();
    }
}