mds.provider.browser.TwuBrowseSignals Maven / Gradle / Ivy

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MDSplus data display program for waveforms, images and more.

There is a newer version: 7.139.60

package mds.provider.browser;

import java.io.BufferedReader;
import java.io.StringReader;
import java.util.StringTokenizer;

import javax.swing.JOptionPane;

import mds.jscope.jScopeBrowseSignals;

public class TwuBrowseSignals extends jScopeBrowseSignals
{
	private static final long serialVersionUID = 3L;
	static private boolean reasonableShotNr(String shot)
	{
		try
		{
			Integer.parseInt(shot);
			return true;
		}
		catch (final NumberFormatException e)
		{
			return false;
		}
	}
	String path;
	String shot = null;
	String tree = null;

	String server_url;

	@Override
	protected String getServerAddr()
	{ return server_url; }

	@Override
	protected String getShot()
	{ return shot == null ? "0" : shot; }

	@Override
	protected String getSignal(String url_name)
	{
		String sig_path = null, curr_line;
		// Assume (like browsers) that missing mime-type indicates text/html.
		final boolean is_image = (mime_type != null && mime_type.indexOf("image") != -1);
		try
		{
			if (is_image)
				sig_path = url_name;
			else
			{
				final BufferedReader br = new BufferedReader(new StringReader(html.getText()));
				while (sig_path == null)
				{
					try
					{
						curr_line = br.readLine();
						if (curr_line.startsWith("SignalURL"))
							sig_path = curr_line.substring(curr_line.indexOf("http:"));
					}
					catch (final Exception exc)
					{
						JOptionPane.showMessageDialog(this,
								"Error reading URL " + url_name + " : Missing \"SignalURL\" property", "alert",
								JOptionPane.ERROR_MESSAGE);
						return null;
					}
				}
				if (sig_path != null)
				{
					String group;
					final StringTokenizer st = new StringTokenizer(sig_path, "/");
					st.nextToken();
					server_url = st.nextToken();
					tree = st.nextToken();
					group = st.nextToken();
					shot = st.nextToken();
					// Hashed_URLs
					// If the URL refers to a TWU signal, we would like it to be hanlded
					// (displayed and so) as a URL. I hope that this does not clash with
					// other jScope codes. If so, tell me!
					// J.G.Krom (Textor, Juelich, Germany) 
					if (reasonableShotNr(shot))
					{
						sig_path = "//" + server_url + "/" + tree + "/" + group + "/#####" + st.nextToken("");
						// The hashes field should map on the shotnumber field. The rest of the
						// URL should be as normal.
					}
					else
						shot = null;
				}
			}
		}
		catch (final Exception exc)
		{
			sig_path = null;
		}
		return sig_path;
	}

	@Override
	protected String getTree()
	{ return tree == null ? "" : tree; }
}