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High quality UI controls and other tools to complement the core JavaFX distribution

There is a newer version: 11.2.1

/**
 * Copyright (c) 2014, ControlsFX
 * 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 ControlsFX, any associated website, 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 CONTROLSFX 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 org.controlsfx.control;

import impl.org.controlsfx.version.VersionChecker;
import javafx.scene.control.Control;

abstract class ControlsFXControl extends Control {

    public ControlsFXControl() {
        VersionChecker.doVersionCheck();
    }

    private String stylesheet;

    /**
     * A helper method that ensures that the resource based lookup of the user
     * agent stylesheet only happens once. Caches the external form of the
     * resource.
     *
     * @param clazz
     *            the class used for the resource lookup
     * @param fileName
     *            the name of the user agent stylesheet
     * @return the external form of the user agent stylesheet (the path)
     */
    protected final String getUserAgentStylesheet(Class clazz,
            String fileName) {

        /*
         * For more information please see RT-40658
         */
        if (stylesheet == null) {
            stylesheet = clazz.getResource(fileName).toExternalForm();
        }

        return stylesheet;
    }
}