--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/util/resource/ResourceCollection.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,482 @@
+//
+//  ========================================================================
+//  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.util.resource;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.StringTokenizer;
+
+import org.eclipse.jetty.util.URIUtil;
+
+/**
+ * A collection of resources (dirs).
+ * Allows webapps to have multiple (static) sources.
+ * The first resource in the collection is the main resource.
+ * If a resource is not found in the main resource, it looks it up in 
+ * the order the resources were constructed.
+ * 
+ * 
+ *
+ */
+public class ResourceCollection extends Resource
+{
+    private Resource[] _resources;
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Instantiates an empty resource collection.
+     * 
+     * This constructor is used when configuring jetty-maven-plugin.
+     */
+    public ResourceCollection()
+    {
+        _resources = new Resource[0];
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Instantiates a new resource collection.
+     *
+     * @param resources the resources to be added to collection
+     */
+    public ResourceCollection(Resource... resources)
+    {
+        List<Resource> list = new ArrayList<Resource>();
+        for (Resource r : resources)
+        {
+            if (r==null)
+                continue;
+            if (r instanceof ResourceCollection)
+            {
+                for (Resource r2 : ((ResourceCollection)r).getResources())
+                    list.add(r2);
+            }
+            else
+                list.add(r);
+        }
+        _resources = list.toArray(new Resource[list.size()]);
+        for(Resource r : _resources)
+        {
+            if(!r.exists() || !r.isDirectory())
+                throw new IllegalArgumentException(r + " is not an existing directory.");
+        }
+    }
+    
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Instantiates a new resource collection.
+     *
+     * @param resources the resource strings to be added to collection
+     */
+    public ResourceCollection(String[] resources)
+    {
+        _resources = new Resource[resources.length];
+        try
+        {
+            for(int i=0; i<resources.length; i++)
+            {
+                _resources[i] = Resource.newResource(resources[i]);
+                if(!_resources[i].exists() || !_resources[i].isDirectory())
+                    throw new IllegalArgumentException(_resources[i] + " is not an existing directory.");
+            }
+        }
+        catch(IllegalArgumentException e)
+        {
+            throw e;
+        }
+        catch(Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Instantiates a new resource collection.
+     *
+     * @param csvResources the string containing comma-separated resource strings
+     */
+    public ResourceCollection(String csvResources)
+    {
+        setResourcesAsCSV(csvResources);
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Retrieves the resource collection's resources.
+     * 
+     * @return the resource array
+     */
+    public Resource[] getResources()
+    {
+        return _resources;
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Sets the resource collection's resources.
+     *
+     * @param resources the new resource array
+     */
+    public void setResources(Resource[] resources)
+    {
+        _resources = resources != null ? resources : new Resource[0];
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Sets the resources as string of comma-separated values.
+     * This method should be used when configuring jetty-maven-plugin.
+     *
+     * @param csvResources the comma-separated string containing
+     *                     one or more resource strings.
+     */
+    public void setResourcesAsCSV(String csvResources)
+    {
+        StringTokenizer tokenizer = new StringTokenizer(csvResources, ",;");
+        int len = tokenizer.countTokens();
+        if(len==0)
+        {
+            throw new IllegalArgumentException("ResourceCollection@setResourcesAsCSV(String) " +
+                    " argument must be a string containing one or more comma-separated resource strings.");
+        }
+        
+        _resources = new Resource[len];
+        try
+        {            
+            for(int i=0; tokenizer.hasMoreTokens(); i++)
+            {
+                _resources[i] = Resource.newResource(tokenizer.nextToken().trim());
+                if(!_resources[i].exists() || !_resources[i].isDirectory())
+                    throw new IllegalArgumentException(_resources[i] + " is not an existing directory.");
+            }
+        }
+        catch(Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * @param path The path segment to add
+     * @return The contained resource (found first) in the collection of resources
+     */
+    @Override
+    public Resource addPath(String path) throws IOException, MalformedURLException
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        if(path==null)
+            throw new MalformedURLException();
+        
+        if(path.length()==0 || URIUtil.SLASH.equals(path))
+            return this;
+        
+        Resource resource=null;
+        ArrayList<Resource> resources = null;
+        int i=0;
+        for(; i<_resources.length; i++)
+        {
+            resource = _resources[i].addPath(path);  
+            if (resource.exists())
+            {
+                if (resource.isDirectory())
+                    break;       
+                return resource;
+            }
+        }  
+
+        for(i++; i<_resources.length; i++)
+        {
+            Resource r = _resources[i].addPath(path); 
+            if (r.exists() && r.isDirectory())
+            {
+                if (resource!=null)
+                {
+                    resources = new ArrayList<Resource>();
+                    resources.add(resource);
+                    resource=null;
+                }
+                resources.add(r);
+            }
+        }
+
+        if (resource!=null)
+            return resource;
+        if (resources!=null)
+            return new ResourceCollection(resources.toArray(new Resource[resources.size()]));
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * @param path
+     * @return the resource(file) if found, returns a list of resource dirs if its a dir, else null.
+     * @throws IOException
+     * @throws MalformedURLException
+     */
+    protected Object findResource(String path) throws IOException, MalformedURLException
+    {        
+        Resource resource=null;
+        ArrayList<Resource> resources = null;
+        int i=0;
+        for(; i<_resources.length; i++)
+        {
+            resource = _resources[i].addPath(path);  
+            if (resource.exists())
+            {
+                if (resource.isDirectory())
+                    break;
+               
+                return resource;
+            }
+        }  
+
+        for(i++; i<_resources.length; i++)
+        {
+            Resource r = _resources[i].addPath(path); 
+            if (r.exists() && r.isDirectory())
+            {
+                if (resource!=null)
+                {
+                    resources = new ArrayList<Resource>();
+                    resources.add(resource);
+                }
+                resources.add(r);
+            }
+        }
+        
+        if (resource!=null)
+            return resource;
+        if (resources!=null)
+            return resources;
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean delete() throws SecurityException
+    {
+        throw new UnsupportedOperationException();
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean exists()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        return true;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public File getFile() throws IOException
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            File f = r.getFile();
+            if(f!=null)
+                return f;
+        }
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public InputStream getInputStream() throws IOException
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            InputStream is = r.getInputStream();
+            if(is!=null)
+                return is;
+        }
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public String getName()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            String name = r.getName();
+            if(name!=null)
+                return name;
+        }
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public OutputStream getOutputStream() throws IOException, SecurityException
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            OutputStream os = r.getOutputStream();
+            if(os!=null)
+                return os;
+        }
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public URL getURL()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            URL url = r.getURL();
+            if(url!=null)
+                return url;
+        }
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean isDirectory()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        return true;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public long lastModified()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+        {
+            long lm = r.lastModified();
+            if (lm!=-1)
+                return lm;
+        }
+        return -1;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public long length()
+    {
+        return -1;
+    }    
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * @return The list of resource names(merged) contained in the collection of resources.
+     */    
+    @Override
+    public String[] list()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        HashSet<String> set = new HashSet<String>();
+        for(Resource r : _resources)
+        {
+            for(String s : r.list())
+                set.add(s);
+        }
+        String[] result=set.toArray(new String[set.size()]);
+        Arrays.sort(result);
+        return result;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public void release()
+    {
+        if(_resources==null)
+            throw new IllegalStateException("*resources* not set.");
+        
+        for(Resource r : _resources)
+            r.release();
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean renameTo(Resource dest) throws SecurityException
+    {
+        throw new UnsupportedOperationException();
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void copyTo(File destination)
+        throws IOException
+    {
+        for (int r=_resources.length;r-->0;)
+            _resources[r].copyTo(destination);
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * @return the list of resources separated by a path separator
+     */
+    @Override
+    public String toString()
+    {
+        if(_resources==null)
+            return "[]";
+        
+        return String.valueOf(Arrays.asList(_resources));
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean isContainedIn(Resource r) throws MalformedURLException
+    {
+        // TODO could look at implementing the semantic of is this collection a subset of the Resource r?
+        return false;
+    }
+
+}