/*
 * Copyright 2012-2015 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.vm.heap.analysis.command;

import java.util.Iterator;

public class HeapPath<T> implements Iterable<T> {

    private static class HeapPathIterator<T> implements Iterator<T> {

        private HeapPath<T> path;

        HeapPathIterator(HeapPath<T> path) {
            this.path = path;
        }

        @Override
        public boolean hasNext() {
            return path != null;
        }

        @Override
        public T next() {
            T next = path.node;
            path = path.path;
            return next;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }

    }

    private HeapPath<T> path;
    private T node;
    private int length;

    HeapPath(T head) {
        this(head, null);
    }

    HeapPath(T node, HeapPath<T> path) {
        this.node = node;
        this.path = path;
        if (path != null) {
            length = path.length + 1;
        } else {
            length = 1;
        }
    }

    @Override
    public Iterator<T> iterator() {
        return new HeapPathIterator<T>(this);
    }

    T getNode() {
        return node;
    }

    int getLength() {
        return length;
    }
}