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The JGoodies Animation framework enables you to produce sophisticated time-based real-time animations in Java. It has been designed for a seemless, flexible and powerful integration with Java, ease-of-use and a small library size.

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/*
 * Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o 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.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch 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.jgoodies.animation;

import static com.jgoodies.common.base.Preconditions.checkArgument;

/**
 * An abstract class that minimizes the effort required to implement
 * the {@link AnimationFunction} interface.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.8 $
 *
 * @see AnimationFunctions
 */
public abstract class AbstractAnimationFunction
    implements AnimationFunction {

    /**
     * Describes this animation function's duration.
     */
    private final long duration;


    // Instance Creation ******************************************************

    /**
     * Constructs an {@code AbstractAnimationFunction} using the given
     * duration.
     *
     * @param duration    the function's duration
     * @throws IllegalArgumentException  if the duration is negative
     */
    protected AbstractAnimationFunction(long duration) {
        checkArgument(duration >= 0, "The duration must not be negative.");
        this.duration = duration;
    }


    // ************************************************************************

    /**
     * Checks whether the given time is in the valid time range, that is
     * a non-negative time that is smaller than this function's duration.
     * If not, an {@code IllegalArgumentException} is thrown.
     *
     * @param time   the time to be checked
     * @throws IllegalArgumentException  if the time is outside the valid time
     *     range
     */
    protected final void checkTimeRange(long time) {
        if (time < 0 || time >= duration()) {
            throw new IllegalArgumentException(
                "The time must be larger than 0 and smaller than "
                    + duration()
                    + ".");
        }
    }


    /**
     * Returns this animation function's duration.
     *
     * @return this animation function's duration
     */
    @Override
	public final long duration() {
        return duration;
    }

}