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WebWork is a Java web-application development framework. It is built specifically with developer productivity and code simplicity in mind, providing robust support for building reusable UI templates, such as form controls, UI themes, internationalization, dynamic form parameter mapping to JavaBeans, robust client and server side validation, and much more.

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/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.webwork.util;

import java.io.Serializable;


/**
 * A bean that can be used to keep track of a counter.
 * 
 * Since it is an Iterator it can be used by the iterator tag
 *
 * @author Rickard ?berg ([email protected])
 * @version $Revision: 1282 $
 * @see 
 */
public class Counter implements java.util.Iterator, Serializable {

    boolean wrap = false;

    // Attributes ----------------------------------------------------
    long first = 1;
    long current = first;
    long interval = 1;
    long last = -1;


    public void setAdd(long addition) {
        current += addition;
    }

    public void setCurrent(long current) {
        this.current = current;
    }

    public long getCurrent() {
        return current;
    }

    public void setFirst(long first) {
        this.first = first;
        current = first;
    }

    public long getFirst() {
        return first;
    }

    public void setInterval(long interval) {
        this.interval = interval;
    }

    public long getInterval() {
        return interval;
    }

    public void setLast(long last) {
        this.last = last;
    }

    public long getLast() {
        return last;
    }

    // Public --------------------------------------------------------
    public long getNext() {
        long next = current;
        current += interval;

        if (wrap && (current > last)) {
            current -= ((1 + last) - first);
        }

        return next;
    }

    public long getPrevious() {
        current -= interval;

        if (wrap && (current < first)) {
            current += (last - first + 1);
        }

        return current;
    }

    public void setWrap(boolean wrap) {
        this.wrap = wrap;
    }

    public boolean isWrap() {
        return wrap;
    }

    public boolean hasNext() {
        return ((last == -1) || wrap) ? true : (current <= last);
    }

    public Object next() {
        return new Long(getNext());
    }

    public void remove() {
        // Do nothing
    }
}