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/*
 * Beangle, Agile Development Scaffold and Toolkits.
 *
 * Copyright © 2005, The Beangle Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */
package org.beangle.inject.spring.config;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.springframework.core.io.Resource;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

/**
 * 
 * BeanDefinitionReader class.
 * 
 *
 * @author chaostone
 * @version $Id: $
 */
class BeanDefinitionReader {

  /**
   * 
   * load.
   * 
   *
   * @param resource a {@link org.springframework.core.io.Resource} object.
   * @return a {@link java.util.List} object.
   */
  public List load(Resource resource) {
    List holders = new ArrayList();
    try {
      InputStream inputStream = resource.getInputStream();
      try {
        InputSource inputSource = new InputSource(inputStream);
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = factory.newDocumentBuilder();
        Document doc = docBuilder.parse(inputSource);
        Element root = doc.getDocumentElement();
        NodeList nl = root.getChildNodes();
        BeanDefinitionParser parser = new BeanDefinitionParser();
        for (int i = 0; i < nl.getLength(); i++) {
          Node node = nl.item(i);
          if (node instanceof Element) {
            Element ele = (Element) node;
            ReconfigBeanDefinitionHolder holder = parser.parseBeanDefinitionElement(ele);
            holders.add(holder);
          }
        }
      } finally {
        if (null != inputStream) {
          inputStream.close();
        }
      }
    } catch (Exception ex) {
      throw new RuntimeException("IOException parsing XML document from " + resource.getDescription(), ex);
    }
    return holders;
  }
}