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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.
 * %%
 * Copyright (C) 2009 - 2014 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
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.scijava.display;

import java.util.List;

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.
	 * 
	 * @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.
	 * 
	 * @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);

}