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//========================================================================
//Copyright 2007 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at 
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//========================================================================

package org.mortbay.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.HashSet;
import java.util.StringTokenizer;

import org.mortbay.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.
 * 
 * @author dyu
 *
 */
public class ResourceCollection extends Resource
{
    
    private Resource[] _resources;
    
    public ResourceCollection()
    {
        
    }
    
    /* ------------------------------------------------------------ */
    public ResourceCollection(Resource[] resources)
    {
        setResources(resources);
    }
    
    /* ------------------------------------------------------------ */
    public ResourceCollection(String[] resources)
    {
        setResources(resources);
    }
    
    /* ------------------------------------------------------------ */
    public ResourceCollection(String csvResources)
    {
        setResources(csvResources);
    }
    
    /* ------------------------------------------------------------ */
    /**
     * 
     * @param resources Resource array
     */
    public void setResources(Resource[] resources)
    {
        if(_resources!=null)
            throw new IllegalStateException("*resources* already set.");
        
        if(resources==null)
            throw new IllegalArgumentException("*resources* must not be null.");
        
        if(resources.length==0)
            throw new IllegalArgumentException("arg *resources* must be one or more resources.");
        
        _resources = resources;
        for(int i=0; i<_resources.length; i++)
        {
            Resource r = _resources[i];
            if(!r.exists() || !r.isDirectory())
                throw new IllegalArgumentException(r + " is not an existing directory.");
        }
    }
    
    /* ------------------------------------------------------------ */
    /**
     * 
     * @param resources String array
     */
    public void setResources(String[] resources)
    {
        if(_resources!=null)
            throw new IllegalStateException("*resources* already set.");
        
        if(resources==null)
            throw new IllegalArgumentException("*resources* must not be null.");
        
        if(resources.length==0)
            throw new IllegalArgumentException("arg *resources* must be one or more resources.");
        
        _resources = new Resource[resources.length];
        try
        {
            for(int i=0; i