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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 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.javafx.application;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javafx.application.Application;
import netscape.javascript.JSObject;


public abstract class HostServicesDelegate {

    private static Method getInstanceMeth = null;

    public static HostServicesDelegate getInstance(final Application app) {
        // Call into the deploy code to get the delegate class
        HostServicesDelegate instance = null;
        try {
            instance = AccessController.doPrivileged(
                    new PrivilegedExceptionAction() {
                @Override
                public HostServicesDelegate run()
                        throws NoSuchMethodException, IllegalAccessException,
                        InvocationTargetException, ExceptionInInitializerError,
                        InstantiationException {
                    if (getInstanceMeth == null) {
                        try {
                            final String factoryClassName =
                                    "com.sun.deploy.uitoolkit.impl.fx.HostServicesFactory";

                            Class factoryClass = Class.forName(factoryClassName,
                                    true,
                                    HostServicesDelegate.class.getClassLoader());
                            getInstanceMeth = factoryClass.getMethod(
                                    "getInstance", Application.class);
                        } catch (Exception ex) {
                            ex.printStackTrace();
                            return null;
                        }
                    }
                    return (HostServicesDelegate)
                            getInstanceMeth.invoke(null, app);
                }
            });
        } catch (PrivilegedActionException pae) {
            System.err.println(pae.getException().toString());
            return null;
        }

        return instance;
    }

    protected HostServicesDelegate() {
    }

    public abstract String getCodeBase();

    public abstract String getDocumentBase();

    public abstract void showDocument(String uri);

    public abstract JSObject getWebContext();
}