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 * Institute of Molecular Cell Biology and Genetics, University of
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package org.scijava.ui.console;

import java.util.LinkedList;

import org.scijava.Context;
import org.scijava.console.AbstractConsoleArgument;
import org.scijava.console.ConsoleArgument;
import org.scijava.console.ConsoleService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.ui.UIService;

/**
 * Handles the {@code --headless} argument to signal that no UI will be opened
 * and the enclosing {@link Context} will not be used after the
 * {@link ConsoleService} argument processing is complete.
 *
 * @author Mark Hiner
 */
@Plugin(type = ConsoleArgument.class)
public class HeadlessArgument extends AbstractConsoleArgument {

	@Parameter(required = false)
	private UIService uiService;

	// -- Constructor --

	public HeadlessArgument() {
		super(1, "--headless");
	}

	// -- ConsoleArgument methods --

	@Override
	public void handle(final LinkedList args) {
		if (!supports(args)) return;

		args.removeFirst(); // --headless

		uiService.setHeadless(true);
	}

	// -- Typed methods --

	@Override
	public boolean supports(final LinkedList args) {
		return uiService != null && super.supports(args);
	}
}