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package org.scijava.ui.console;

import java.util.LinkedList;

import org.scijava.console.AbstractConsoleArgument;
import org.scijava.console.ConsoleArgument;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.ui.UIService;
import org.scijava.ui.UserInterface;

/**
 * Handles the {@code --ui} command line argument.
 * 
 * This argument overrides the default user interface.
 * 
 * 
 * @author Curtis Rueden
 */
@Plugin(type = ConsoleArgument.class)
public class UIArgument extends AbstractConsoleArgument {

	@Parameter
	private UIService uiService;

	@Parameter
	private LogService log;

	// -- Constructor --

	public UIArgument() {
		super(2, "--ui");
	}

	// -- ConsoleArgument methods --

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

		args.removeFirst(); // --ui
		final String uiName = args.removeFirst();

			final UserInterface ui = uiService.getUI(uiName);
			if (ui == null) {
				log.error("No such UI: " + uiName);
			}
			else {
				uiService.setDefaultUI(ui);
			}
	}

}