/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
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package org.scijava.platform;

import java.io.IOException;
import java.net.URL;

import org.scijava.Priority;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * A platform implementation for default handling of platform issues.
 * 
 * @author Curtis Rueden
 * @author Johannes Schindelin
 */
@Plugin(type = Platform.class, name = "Default", priority = Priority.VERY_LOW)
public class DefaultPlatform extends AbstractPlatform {

	@Parameter(required = false)
	private LogService log;

	// -- PlatformHandler methods --

	/**
	 * Falls back to calling known browsers.
	 * <p>
	 * Based on <a
	 * href="http://www.centerkey.com/java/browser/">BareBonesBrowserLaunch</a>.
	 * </p>
	 * <p>
	 * The utility 'xdg-open' launches the URL in the user's preferred browser,
	 * therefore we try to use it first, before trying to discover other browsers.
	 * </p>
	 */
	@Override
	public void open(final URL url) throws IOException {
		final String[] browsers =
			{ "xdg-open", "netscape", "firefox", "konqueror", "mozilla", "opera",
				"epiphany", "lynx" };
		for (final String browser : browsers) {
			try {
				final int exitCode = getPlatformService().exec(browser, url.toString());
				if (exitCode == 0) return;
				else if (log != null) {
					log.debug("Command '" + browser +
						"' failed with exit code " + exitCode);
				}
			}
			catch (final IOException e) {
				// browser executable was invalid; try the next one
				if (log != null) log.debug("Command '" + browser + "' failed", e);
			}
		}
		throw new IOException("Could not open " + url);
	}

}
