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//
//  ========================================================================
//  Copyright (c) 1995-2014 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.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;

/**
 * MetaInfConfiguration
 *
 * Scan META-INF of all jars in WEB-INF/lib to find:
 * 
 * tlds
 * 
web-fragment.xml
 * 
resources
 * 
 */
public class MetaInfConfiguration extends AbstractConfiguration
{
    private static final Logger LOG = Log.getLogger(MetaInfConfiguration.class);

    public static final String METAINF_TLDS = TagLibConfiguration.TLD_RESOURCES;
    public static final String METAINF_FRAGMENTS = FragmentConfiguration.FRAGMENT_RESOURCES;
    public static final String METAINF_RESOURCES = WebInfConfiguration.RESOURCE_DIRS;
  
    @Override
    public void preConfigure(final WebAppContext context) throws Exception
    {
       //Merge all container and webinf lib jars to look for META-INF resources     
        ArrayList jars = new ArrayList();
        jars.addAll(context.getMetaData().getContainerResources());
        jars.addAll(context.getMetaData().getWebInfJars());
        
        //Scan jars for META-INF information
        if (jars != null)
        {
            for (Resource r : jars)
            {
                URI uri = r.getURI();
                Resource fragXml = Resource.newResource("jar:"+uri+"!/META-INF/web-fragment.xml");
                if (fragXml.exists())
                {
                    //add mapping for resource->fragment
                    Map fragments = (Map)context.getAttribute(METAINF_FRAGMENTS);
                    if (fragments == null)
                    {
                        fragments = new HashMap();
                        context.setAttribute(METAINF_FRAGMENTS, fragments);
                    }
                    fragments.put(r, fragXml);    
                }
                
                Resource resourcesDir = Resource.newResource("jar:"+uri+"!/META-INF/resources");
                if (resourcesDir.exists())
                {
                    //add resources dir
                    Set dirs = (Set)context.getAttribute(METAINF_RESOURCES);
                    if (dirs == null)
                    {
                        dirs = new HashSet();
                        context.setAttribute(METAINF_RESOURCES, dirs);
                    }
                    dirs.add(resourcesDir);
                }
            }
        }
    }
   
    @Override
    public void postConfigure(WebAppContext context) throws Exception
    {
        context.setAttribute(METAINF_FRAGMENTS, null); 
        context.setAttribute(METAINF_RESOURCES, null);
        context.setAttribute(METAINF_TLDS, null);
    }
}