/*
 * Created on Nov 2, 2004
 * Copyright (C) Andrea Schweer, 2004
 *
 * This file is part of the Greenstone Alerting Service.
 * Refer to the COPYING file in the base directory of this package
 * for licensing information.
 */
package org.greenstone.gsdlas.profiles;

import java.util.*;
import java.util.Set;
import java.util.TreeSet;

/**
 * @author schweer
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public abstract class Predicate implements Comparable {

    protected Set subscriptions = new TreeSet();
    protected String field;
    protected String value;
    protected int id;
    
    public void addSubscription(Subscription sub) {
        subscriptions.add(sub);
    }

    /* (non-Javadoc)
     * @see org.greenstone.gsdlas.profiles.Predicate#getSubscriptions()
     */
    public Set getSubscriptions() {
        return Collections.unmodifiableSet(subscriptions);
    }

    public int getID() {
        return id;
    }
    
    public void setID(int i) {
        this.id = i;
    }

    /* (non-Javadoc)
     * @see org.greenstone.gsdlas.profiles.Predicate#getKey()
     */
    public String getField() {
        return field;
    }

    /* (non-Javadoc)
     * @see org.greenstone.gsdlas.profiles.Predicate#getValue()
     */
    public String getValue() {
        return value;
    }

    public String toString() {
        return field + "=" + value;
    }
    
    public boolean equals(Object other) {
        if (other == null || !(other instanceof Predicate)) return false;
        return id == ((Predicate)other).getID();
    }
    
    public int compareTo(Object other) {
        Predicate otherPredicate = (Predicate) other;
        return new Integer(id).compareTo(new Integer(otherPredicate.getID()));
    }
    
    public abstract boolean isSatisfied(Map event);
    
}