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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 both ImageJ and SCIFIO.
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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 */

package org.scijava.display;

import java.util.List;

import org.scijava.display.event.DisplayCreatedEvent;
import org.scijava.display.event.DisplayDeletedEvent;
import org.scijava.event.EventService;
import org.scijava.object.ObjectService;
import org.scijava.plugin.PluginInfo;
import org.scijava.plugin.PluginService;
import org.scijava.service.SciJavaService;

/**
 * Interface for service that tracks available {@link Display}s.
 * 
 * @author Barry DeZonia
 * @author Curtis Rueden
 * @author Grant Harris
 */
public interface DisplayService extends SciJavaService {

	EventService getEventService();

	ObjectService getObjectService();

	PluginService getPluginService();

	/** Gets the currently active display (of any Display type). */
	Display getActiveDisplay();

	/** Gets the most recently active display (of the specified Display type). */
	> D getActiveDisplay(Class displayClass);

	/**
	 * Set the active display.
	 * 
	 * @param display
	 */
	void setActiveDisplay(Display display);

	/** Gets the list of known display plugins. */
	List>> getDisplayPlugins();

	/**
	 * Gets the display plugin of the given class, or null if none.
	 */
	> PluginInfo> getDisplayPlugin(
		Class pluginClass);

	/**
	 * Gets the display plugin of the given class name, or null if none.
	 * 
	 * @throws ClassCastException if the plugin found is not a display plugin.
	 */
	PluginInfo> getDisplayPlugin(String className);

	/**
	 * Gets the list of display plugins of the given type (e.g.,
	 * {@code ImageDisplay.class}).
	 */
	> List> getDisplayPluginsOfType(
		Class
 type);

	/** Gets a list of all available displays. */
	List> getDisplays();

	/**
	 * Gets a list of all available displays of the given type (e.g.,
	 * {@code ImageDisplay.class}).
	 */
	
> List
 getDisplaysOfType(Class type);

	/** Gets a display by its name. */
	Display getDisplay(String name);

	/** Gets a list of displays currently visualizing the given object. */
	List> getDisplays(Object o);

	/**
	 * Checks whether the given name is already taken by an existing display.
	 * 
	 * @param name The name to check.
	 * @return true if the name is available, false if already taken.
	 */
	boolean isUniqueName(String name);

	/**
	 * Creates a display for the given object, publishing a
	 * {@link DisplayCreatedEvent} to notify interested parties. In particular:
	 * 
	 * Visible UIs will respond to this event by showing the display.
	 * The {@link ObjectService} will add the new display to its index, until
	 * a corresponding {@link DisplayDeletedEvent} is later published.
	 * 
	 * 
	 * To create a {@link Display} without publishing an event, see
	 * {@link #createDisplayQuietly}.
	 * 
	 * 
	 * @param o The object for which a display should be created. The object is
	 *          then added to the display.
	 * @return Newly created {@code Display} containing the given object. The
	 *         Display is typed with ? rather than T matching the Object because
	 *         it is possible for the Display to be a collection of some other
	 *         sort of object than the one being added. For example, ImageDisplay
	 *         is a {@code Display} with the DataView wrapping a
	 *         Dataset, yet the ImageDisplay supports adding Datasets directly,
	 *         taking care of wrapping them in a DataView as needed.
	 */
	Display createDisplay(Object o);

	/**
	 * Creates a display for the given object, publishing a
	 * {@link DisplayCreatedEvent} to notify interested parties. In particular:
	 * 
	 * Visible UIs will respond to this event by showing the display.
	 * The {@link ObjectService} will add the new display to its index, until
	 * a corresponding {@link DisplayDeletedEvent} is later published.
	 * 
	 * 
	 * To create a {@link Display} without publishing an event, see
	 * {@link #createDisplayQuietly}.
	 * 
	 * 
	 * @param name The name to be assigned to the display.
	 * @param o The object for which a display should be created. The object is
	 *          then added to the display.
	 * @return Newly created {@code Display} containing the given object. The
	 *         Display is typed with ? rather than T matching the Object because
	 *         it is possible for the Display to be a collection of some other
	 *         sort of object than the one being added. For example, ImageDisplay
	 *         is a {@code Display} with the DataView wrapping a
	 *         Dataset, yet the ImageDisplay supports adding Datasets directly,
	 *         taking care of wrapping them in a DataView as needed.
	 */
	Display createDisplay(String name, Object o);

	/**
	 * Creates a display for the given object, without publishing a
	 * {@link DisplayCreatedEvent}. Hence, the display will not be automatically
	 * shown or tracked.
	 * 
	 * @param o The object for which a display should be created. The object is
	 *          then added to the display.
	 * @return Newly created {@code Display} containing the given object. The
	 *         Display is typed with ? rather than T matching the Object because
	 *         it is possible for the Display to be a collection of some other
	 *         sort of object than the one being added. For example, ImageDisplay
	 *         is a {@code Display} with the DataView wrapping a
	 *         Dataset, yet the ImageDisplay supports adding Datasets directly,
	 *         taking care of wrapping them in a DataView as needed.
	 */
	Display createDisplayQuietly(Object o);

}