/******************************************************************
*
*	CyberXML for Java
*
*	Copyright (C) Satoshi Konno 2002
*
*	File: Parser.java
*
*	Revision;
*
*	11/26/03
*		- first revision.
*
******************************************************************/

package org.cybergarage.xml;

import java.net.*;
import java.io.*;

public abstract class Parser 
{
	////////////////////////////////////////////////
	//	Constructor
	////////////////////////////////////////////////

	public Parser()
	{
	}

	////////////////////////////////////////////////
	//	parse
	////////////////////////////////////////////////

	public abstract Node parse(InputStream inStream) throws ParserException;

	////////////////////////////////////////////////
	//	parse (URL)
	////////////////////////////////////////////////

	public Node parse(URL locationURL) throws ParserException
	{
		try {
	 		HttpURLConnection urlCon = (HttpURLConnection)locationURL.openConnection();
			urlCon.setRequestMethod("GET");
			InputStream urlIn = urlCon.getInputStream();

			Node rootElem = parse(urlIn);
			
			urlIn.close();
			urlCon.disconnect();

			return rootElem;
			
		} catch (Exception e) {
			throw new ParserException(e);
		}
		/*
		String host = locationURL.getHost();
		int port = locationURL.getPort();
		String uri = locationURL.getPath();
		HTTPRequest httpReq = new HTTPRequest();
		httpReq.setMethod(HTTP.GET);
		httpReq.setURI(uri);
		HTTPResponse httpRes = httpReq.post(host, port);
		if (httpRes.getStatusCode() != HTTPStatus.OK)
			throw new ParserException(locationURL.toString());
		String content = new String(httpRes.getContent());
		StringBufferInputStream strBuf = new StringBufferInputStream(content);
		return parse(strBuf);
		*/
	}

	public Node parse(String locationURL) throws ParserException
	{
		try {
			URL url = new URL(locationURL);
			return parse(url);		
		} catch (Exception e) {
			throw new ParserException(e);
		}
	}

	////////////////////////////////////////////////
	//	parse (File)
	////////////////////////////////////////////////

	public Node parse(File descriptionFile) throws ParserException
	{
		try {
			InputStream fileIn = new FileInputStream(descriptionFile);

			Node root = parse(fileIn);
			
			fileIn.close();

			return root;
			
		} catch (Exception e) {
			throw new ParserException(e);
		}
	}
}