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package org.scijava.display;

import java.util.List;

import org.scijava.Named;
import org.scijava.plugin.Plugin;
import org.scijava.plugin.RichPlugin;

/**
 * A display is a particular type of plugin intended to collect objects for
 * visualization. For example, a {@link TextDisplay} displays {@link String}s.
 * <p>
 * Displays discoverable at runtime must implement this interface and be
 * annotated with @{@link Plugin} with attribute {@link Plugin#type()} =
 * {@link Display}.class. While it possible to create a display merely by
 * implementing this interface, it is encouraged to instead extend
 * {@link AbstractDisplay}, for convenience.
 * </p>
 * 
 * @author Curtis Rueden
 * @author Grant Harris
 * @see Plugin
 * @see DisplayService
 */
public interface Display<T> extends List<T>, RichPlugin, Named {

	/**
	 * Tests whether the display is capable of visualizing objects of the given
	 * class.
	 * 
	 * @param c The class to check for visualization capabilities.
	 * @return True if the display can handle certain objects of the given class;
	 *         false if it cannot visualize any objects of that class.
	 */
	boolean canDisplay(Class<?> c);

	/** Tests whether the display is capable of visualizing the given object. */
	default boolean canDisplay(final Object o) {
		if (o == null) return false;
		return canDisplay(o.getClass());
	}

	/**
	 * Displays the given object in this display.
	 * <p>
	 * This method is essentially the same as {@link #add} except that it accepts
	 * any {@link Object} regardless of type.
	 * </p>
	 * 
	 * @throws IllegalArgumentException if the object cannot be displayed (i.e.,
	 *           if {@link #canDisplay(Object)} returns false).
	 */
	void display(Object o);

	/**
	 * Tests whether the display is currently visualizing the given object.
	 * <p>
	 * Note that this method may behave differently than {@link #contains}; in
	 * general, any time {@link #contains} returns true, this method will also
	 * return true, but not vice versa. For example, in ImageJ, an
	 * {@code ImageDisplay} is a {@code Display<DataView>} but calling
	 * {@code isDisplaying} on a {@code Dataset} (which is not a {@code DataView})
	 * will return true if the {@code ImageDisplay} currently contains a
	 * {@code DatasetView} that wraps that {@code Dataset}.
	 * </p>
	 */
	default boolean isDisplaying(final Object o) {
		return contains(o);
	}

	/** Updates and redraws the display onscreen. */
	void update();

	/** Closes the display and disposes its resources. */
	void close();

}
