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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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/*
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 * SciJava Common shared library for SciJava software.
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
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 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    this list of conditions and the following disclaimer in the documentation
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.scijava.ui;

import java.util.List;

import org.scijava.display.Display;
import org.scijava.display.DisplayService;
import org.scijava.log.LogService;
import org.scijava.plugin.AbstractRichPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.PluginInfo;
import org.scijava.plugin.PluginService;
import org.scijava.prefs.PrefService;
import org.scijava.thread.ThreadService;
import org.scijava.ui.viewer.DisplayViewer;

/**
 * Abstract superclass for {@link UserInterface} implementations.
 * 
 * @author Curtis Rueden
 */
public abstract class AbstractUserInterface extends AbstractRichPlugin
	implements UserInterface
{

	private static final String LAST_X = "lastXLocation";
	private static final String LAST_Y = "lastYLocation";

	@Parameter
	private DisplayService displayService;

	@Parameter
	private LogService log;

	@Parameter
	private PluginService pluginService;

	@Parameter
	private ThreadService threadService;

	@Parameter
	private UIService uiService;

	@Parameter
	private PrefService prefService;

	/** Whether the UI is currently being displayed. */
	private boolean visible = false;

	// -- UserInterface methods --

	@Override
	public void show() {
		createUI();
		visible = true;
	}

	@Override
	public boolean isVisible() {
		return visible;
	}

	@Override
	public void show(final String name, final Object o) {
		final Display display;
		if (o instanceof Display) {
			display = (Display) o;
		}
		else {
			display = displayService.createDisplay(name, o);
		}
		if (!isVisible()) {
			// NB: If this UI is invisible, the display will not be automatically
			// shown. So in that case, we show it explicitly here.
			show(display);
		}
	}

	@Override
	public void show(final Display display) {
		if (uiService.getDisplayViewer(display) != null) {
			// display is already being shown
			return;
		}

		final List>> viewers =
			uiService.getViewerPlugins();

		DisplayViewer displayViewer = null;
		for (final PluginInfo> info : viewers) {
			// check that viewer can actually handle the given display
			final DisplayViewer viewer = pluginService.createInstance(info);
			if (viewer == null) continue;
			if (!viewer.canView(display)) continue;
			if (!viewer.isCompatible(this)) continue;
			displayViewer = viewer;
			break; // found a suitable viewer; we are done
		}
		if (displayViewer == null) {
			log.warn("For UI '" + getClass().getName() +
				"': no suitable viewer for display: " + display);
			return;
		}

		final DisplayViewer finalViewer = displayViewer;
		threadService.queue(new Runnable() {
			@Override
			public void run() {
				uiService.addDisplayViewer(finalViewer);
				finalViewer.view(AbstractUserInterface.this, display);
			}
		});
	}

	@Override
	public void saveLocation() {
		final ApplicationFrame appFrame = getApplicationFrame();
		if (appFrame != null) {
			prefService.put(getClass(), LAST_X, appFrame.getLocationX());
			prefService.put(getClass(), LAST_Y, appFrame.getLocationY());
		}
	}

	@Override
	public void restoreLocation() {
		final ApplicationFrame appFrame = getApplicationFrame();
		if (appFrame != null) {
			final int lastX = prefService.getInt(getClass(), LAST_X, 0);
			final int lastY = prefService.getInt(getClass(), LAST_Y, 0);
			appFrame.setLocation(lastX, lastY);
		}
	}

	// -- Internal methods --

	/**
	 * Subclasses override to control UI creation. They must also call
	 * super.createUI() after creating the {@link ApplicationFrame} but before
	 * showing it (assuming the UI has an {@link ApplicationFrame}).
	 */
	protected void createUI() {
		restoreLocation();
	}
}