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jMonkeyEngine is a 3-D game engine for adventurous Java developers

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/*
 * Copyright (c) 2009-2021 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.jme3.environment.generation;

/**
 *
 * Abstract runnable that can report its progress
 *
 * @author Nehon
 */
public abstract class RunnableWithProgress implements Runnable {

    private int progress;
    private int end;
    protected JobProgressListener listener;

    public RunnableWithProgress() {
    }

    public RunnableWithProgress(JobProgressListener listener) {
        this.listener = listener;
    }
    

    /**
     * set the end step value of the process.
     *
     * @param end the desired end value (default=0)
     */
    protected void setEnd(int end) {
        this.end = end;
    }

    /**
     * return the current progress of the process.
     *
     * @return fraction (≥0, ≤1)
     */
    public double getProgress() {
        return progress / (double) end;
    }

    /**
     * adds one progression step to the process.
     */
    protected void progress() {
        progress++;
        if (listener != null) {
            listener.progress(getProgress());
        }
    }

    /**
     * resets the progression of the process.
     */
    protected void reset() {
        progress = 0;
    }

}