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package org.xmldb.api.sdk;

/*
 * The XML:DB Initiative Software License, Version 1.0
 *
 *
 * Copyright (c) 2000-2003 The XML:DB Initiative.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 * if any, must include the following acknowledgment:
 * "This product includes software developed by the
 * XML:DB Initiative (http://www.xmldb.org/)."
 * Alternately, this acknowledgment may appear in the software itself,
 * if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The name "XML:DB Initiative" must not be used to endorse or
 * promote products derived from this software without prior written
 * permission. For written permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "XML:DB",
 * nor may "XML:DB" appear in their name, without prior written
 * permission of the XML:DB Initiative.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the XML:DB Initiative. For more information
 * on the XML:DB Initiative, please see .
 */

import org.xmldb.api.base.*;
import org.xmldb.api.modules.*;
import org.xmldb.api.reference.modules.*;
import org.w3c.dom.*;

import java.util.List;

/**
 * ResourceIterator is used to iterate over a set of resources.
 */
public class SimpleResourceIterator implements ResourceIterator {   
   protected List resources = null;
   protected int index = 0;
   
   public SimpleResourceIterator(List resources) {
      this.resources = resources;      
   }
   
   /**
    * Returns true as long as there are still more resources to be iterated.
    *
    * @return true if there are more resources to iterate, false otherwise.
    */
   public boolean hasMoreResources() throws XMLDBException {
      return (index < resources.size());
   }


   /**
    * Returns the next Resource instance in the iterator.
    *
    * @return the next Resource instance in the iterator.
    */
   public Resource nextResource() throws XMLDBException {
      if ( index == resources.size() ) {
         throw new XMLDBException(ErrorCodes.NO_SUCH_RESOURCE);
      }
            
      Resource result = (Resource) resources.get(index);
      index++;
      
      return result;
   }
}