package org.honours.greenstone;

import java.io.File;


import org.apache.log4j.Logger;

import org.greenstone.gsdl3.util.GSXML;
import org.greenstone.gsdl3.util.XMLConverter;
import org.w3c.dom.*;

public class ArchiveFileReader {

	static Logger logger = Logger.getLogger(org.honours.greenstone.ArchiveFileReader.class.getName());
	private XMLConverter _xmlConverter;
	private Document _document;
	private String _archiveDocFile;
	
	public ArchiveFileReader(String docXML){
		_xmlConverter = new XMLConverter();
		_archiveDocFile = docXML;
		_document = _xmlConverter.getDOM(new File(_archiveDocFile));
		
	}
	
	public String obtainElementText(String metadataName){
		
		if(metadataName.equals("") || metadataName == null)
			return null;
		
		NodeList nl = _document.getDocumentElement().getElementsByTagName("Description");
		Element description = (Element)nl.item(0);
		
		nl = description.getChildNodes();
		int i = 0;
		
		while(i <= nl.getLength()){
			
			Node node = nl.item(i);
			if(node != null){
			if(node.getNodeType() == Node.ELEMENT_NODE){
				Element e = (Element)node;
				
				if(e.getTagName().equals("Metadata") && e.getAttribute("name")
						.equals(metadataName)){
					
					return GSXML.getNodeText(e);	
				}
			}
			}
			i++;
		}
		
		return null;
	}
}