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// ========================================================================
// Copyright (c) 2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================


package org.eclipse.jetty.webapp;

import java.util.List;

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

/**
 * FragmentConfiguration
 * 
 * 
 * 
 * Process web-fragments in jars
 */
public class FragmentConfiguration extends AbstractConfiguration
{
    public final static String FRAGMENT_RESOURCES="org.eclipse.jetty.webFragments";
    
    @Override
    public void preConfigure(WebAppContext context) throws Exception
    {
        if (!context.isConfigurationDiscovered())
            return;

        //find all web-fragment.xmls
        findWebFragments(context, context.getMetaData());
        
    }

    @Override
    public void configure(WebAppContext context) throws Exception
    { 
        if (!context.isConfigurationDiscovered())
            return;
        
        //order the fragments
        context.getMetaData().orderFragments(); 
    }

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

    /* ------------------------------------------------------------------------------- */
    /**
     * Look for any web-fragment.xml fragments in META-INF of jars in WEB-INF/lib
     * 
     * @throws Exception
     */
    public void findWebFragments (final WebAppContext context, final MetaData metaData) throws Exception
    {
        @SuppressWarnings("unchecked")
        List frags = (List)context.getAttribute(FRAGMENT_RESOURCES);
        if (frags!=null)
        {
            for (Resource frag : frags)
            {
            	if (frag.isDirectory()) //tolerate the case where the library is a directory, not a jar. useful for OSGi for example
            	{
                    metaData.addFragment(frag, Resource.newResource(frag.getURL()+"/META-INF/web-fragment.xml"));            		
            	}
                else //the standard case: a jar most likely inside WEB-INF/lib
                {
                    metaData.addFragment(frag, Resource.newResource("jar:"+frag.getURL()+"!/META-INF/web-fragment.xml"));
                }
            }
        }
    }
}




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