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/*******************************************************************************
 * Copyright (c) 2011-2014 Fernando Petrola
 * 
 *  This file is part of Dragome SDK.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 ******************************************************************************/
package java.net;

import java.io.InputStream;

/**
 * Class URL represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web.
 *
 * 
 */
public class URL
{

	private String representation;

	/**
	 * Creates a URL object from the String representation.
	 */
	public URL(String spec)
	{
		if (!spec.matches("[a-z]+://.*"))
		{
			// TODO: Should throw a MalformedURLException.
			throw new RuntimeException("Protocol part is missing: " + spec);
		}
		representation= spec;
	}

	/**
	 * Creates a URL by parsing the given spec within a specified context.
	 */
	public URL(URL context, String spec)
	{
		if (spec.matches("[a-z]+://.*"))
		{
			// The spec is already absolute.
			representation= spec;
		}
		else
		{
			String base= context.toString();

			// Context URL is of the form ://?#
			// Strip into scheme, authority&path, query and fragment.
			String[] parts= base.split("://|\\?|#");
			String authorityAndPath= parts[1];
			// Strip last path component.
			int index= authorityAndPath.lastIndexOf('/');
			if (index != -1)
			{
				authorityAndPath= authorityAndPath.substring(0, index);
			}
			representation= parts[0] + "://" + authorityAndPath + '/' + spec;
		}
	}

	/**
	 * Constructs a string representation of this URL.
	 */
	public String toString()
	{
		return representation;
	}

	public URI toURI()
	{
		try
		{
			return new URI(toString());
		}
		catch (URISyntaxException e)
		{
			throw new RuntimeException(e);
		}
	}

	public URLConnection openConnection() {
		// TODO Auto-generated method stub
		return null;
	}

	public InputStream openStream() {
		// TODO Auto-generated method stub
		return null;
	}

}