hu.bme.mit.incqueryd.engine.rete.dataunits.Tuple.java Source code

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/*******************************************************************************
 * Copyright (c) 2010-2014, Gabor Szarnyas, Istvan Rath and Daniel Varro
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Gabor Szarnyas - initial API and implementation
 *******************************************************************************/
package hu.bme.mit.incqueryd.engine.rete.dataunits;

import java.io.Serializable;
import java.util.List;

import com.google.common.collect.ImmutableList;

/**
 * Tuple implementation.
 * 
 * @author szarnyasg
 * 
 */
public class Tuple implements Serializable, Comparable<Tuple> {

    private static final long serialVersionUID = 1L;
    protected final List<?> tuple;

    public Tuple(Object... tuple) {
        this.tuple = ImmutableList.copyOf(tuple);
    }

    public Object get(int index) {
        return tuple.get(index);
    }

    public int size() {
        return tuple.size();
    }

    @Override
    public String toString() {
        String result = "<";
        if (tuple.size() > 0) {
            result += tuple.get(0).toString();
            for (int i = 1; i < tuple.size(); i++) {
                result += ", " + tuple.get(i).toString();
            }
        }
        result += ">";
        return result;
    }

    @Override
    public int hashCode() {
        return tuple.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Tuple))
            return false;
        return tuple.equals(((Tuple) obj).tuple);
    }

    @Override
    public int compareTo(Tuple o) {
        for (int i = 0; i < o.size(); i++) {
            Long l1 = (Long) get(i); // TODO avoid cast (store Comparables)
            Long l2 = (Long) o.get(i);

            if (!l1.equals(l2)) {
                return -1;
            } // else continue with the for cycle
        }
        return 0;
    }

}