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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 java.util.Map;
import org.eclipse.jetty.util.resource.Resource;

/**
 * FragmentConfiguration
 * 
 * Process web-fragments in jars
 */
public class FragmentConfiguration extends AbstractConfiguration {

    // Holds a Map .
    //  key: Resource to the Jar
    //  value: Resource to the web fragment xml
    public static final String FRAGMENT_RESOURCES = FragmentConfiguration.class.getPackageName() + ".webFragments";

    public FragmentConfiguration() {
        addDependencies(MetaInfConfiguration.class, WebXmlConfiguration.class);
    }

    @Override
    public void preConfigure(WebAppContext context) throws Exception {
        //add all discovered web-fragment.xmls
        addWebFragments(context, context.getMetaData());
    }

    @Override
    public void postConfigure(WebAppContext context) throws Exception {
        context.setAttribute(FRAGMENT_RESOURCES, null);
    }

    /**
     * Add in fragment descriptors that have already been discovered by MetaInfConfiguration
     *
     * @param context the web app context to look in
     * @param metaData the metadata to populate with fragments
     * @throws Exception if unable to find web fragments
     */
    public void addWebFragments(final WebAppContext context, final MetaData metaData) throws Exception {
        @SuppressWarnings("unchecked")
        Map frags = (Map) context.getAttribute(FRAGMENT_RESOURCES);
        if (frags != null) {
            for (Map.Entry entry : frags.entrySet()) {
                metaData.addFragmentDescriptor(entry.getKey(), new FragmentDescriptor(entry.getValue()));
            }
        }
    }
}