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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.scenario.animation.shared;

import javafx.animation.Animation;
import javafx.util.Duration;
import com.sun.javafx.animation.TickCalculation;

/**
 * An instance of ClipEnvelope handles the loop-part of a clip.
 * 
 * The functionality to react on a pulse-signal from the timer is implemented in
 * two classes: ClipEnvelope and ClipCore. ClipEnvelope is responsible for the
 * "loop-part" (keeping track of the number of cycles, handling the direction of
 * the clip etc.). ClipCore takes care of the inner part (interpolating the
 * values, triggering the action-functions, ...)
 * 
 * Both classes have an abstract public definition and can only be created using
 * the factory method create(). The intent is to provide a general
 * implementation plus eventually some fast-track implementations for common use
 * cases.
 */

public abstract class ClipEnvelope {

    protected static final long INDEFINITE = Long.MAX_VALUE;
    protected static final double EPSILON = 1e-12;

    protected Animation animation;
    protected double rate = 1;
    protected long cycleTicks = 0;

    // internal state-variables used by all implementations
    protected long deltaTicks = 0;
    protected long ticks = 0;
    protected double currentRate = rate;
    protected boolean inTimePulse = false;
    protected boolean aborted = false;
    
    protected ClipEnvelope(Animation animation) {
        this.animation = animation;
        if (animation != null) {
            final Duration cycleDuration = animation.getCycleDuration();
            cycleTicks = TickCalculation.fromDuration(cycleDuration);
            rate = animation.getRate();
        }
    }

    public static ClipEnvelope create(Animation animation) {
        if ((animation.getCycleCount() == 1) || (animation.getCycleDuration().isIndefinite())) {
            return new SingleLoopClipEnvelope(animation);
        } else if (animation.getCycleCount() == Animation.INDEFINITE) {
            return new InfiniteClipEnvelope(animation);
        } else {
            return new FiniteClipEnvelope(animation);
        }
    }

    public abstract ClipEnvelope setCycleDuration(Duration cycleDuration);
    public abstract void setRate(double rate);
    public abstract void setAutoReverse(boolean autoReverse);
    public abstract ClipEnvelope setCycleCount(int cycleCount);

    protected void updateCycleTicks(Duration cycleDuration) {
        cycleTicks = TickCalculation.fromDuration(cycleDuration);
    }

    public boolean wasSynched() {
        return cycleTicks != 0;
    }

    public void start() {
        setCurrentRate(calculateCurrentRate());
        deltaTicks = ticks;
    }

    public abstract void timePulse(long currentTick);

    public abstract void jumpTo(long ticks);

    public void abortCurrentPulse() {
        if (inTimePulse) {
            aborted = true;
            inTimePulse = false;
        }
    }
    
    protected abstract double calculateCurrentRate();
    
    protected void setCurrentRate(double currentRate) {
        this.currentRate = currentRate;
        AnimationAccessor.getDefault().setCurrentRate(animation, currentRate);
    }

    protected static long checkBounds(long value, long max) {
        return Math.max(0L, Math.min(value, max));
    }

    public double getCurrentRate() {
        return currentRate;
    }
}