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Jetty web application support

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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.ee8.webapp;

import org.eclipse.jetty.util.Loader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Jetty Servlets Configuration
 * This configuration configures the WebAppContext server/system classes to
 * expose the jetty utility servlets if they are on the server classpath.
 * 
 */
public class ServletsConfiguration extends AbstractConfiguration {

    private static final Logger LOG = LoggerFactory.getLogger(ServletsConfiguration.class);

    public ServletsConfiguration() {
        addDependencies(WebXmlConfiguration.class, MetaInfConfiguration.class, WebInfConfiguration.class, WebAppConfiguration.class);
        addDependents(JettyWebXmlConfiguration.class);
        protectAndExpose();
        // don't hide jetty servlets
        expose("org.eclipse.jetty.ee8.servlets.");
    }

    @Override
    public boolean isAvailable() {
        try {
            return Loader.loadClass("org.eclipse.jetty.ee8.servlets.DoSFilter") != null;
        } catch (Throwable e) {
            LOG.trace("IGNORED", e);
            return false;
        }
    }
}