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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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/*
 * #%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.
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 * 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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package org.scijava.ui.dnd;

import org.scijava.app.StatusService;
import org.scijava.display.Display;
import org.scijava.event.EventHandler;
import org.scijava.plugin.AbstractHandlerService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;
import org.scijava.ui.dnd.event.DragEnterEvent;
import org.scijava.ui.dnd.event.DragExitEvent;
import org.scijava.ui.dnd.event.DragOverEvent;
import org.scijava.ui.dnd.event.DropEvent;

/**
 * Default service for handling drag and drop events.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = Service.class)
public class DefaultDragAndDropService extends
	AbstractHandlerService> implements
	DragAndDropService
{

	private static final String SUPPORTED = "Drag and Drop";
	private static final String UNSUPPORTED = "Unsupported Object";

	@Parameter
	private StatusService statusService;

	// -- DragAndDropService methods --

	@Override
	public boolean supports(final DragAndDropData data,
		final Display display)
	{
		return getHandler(data, display) != null;
	}

	@Override
	public boolean supports(final Object object, final Display display) {
		return getHandler(object, display) != null;
	}

	@Override
	public boolean drop(final DragAndDropData data, final Display display) {
		final DragAndDropHandler handler = getHandler(data, display);
		if (handler == null) return false;
		return handler.dropData(data, display);
	}

	@Override
	public boolean drop(final Object data, final Display display) {
		final DragAndDropHandler handler = getHandler(data, display);
		if (handler == null) return false;
		return handler.dropObject(data, display);
	}

	@Override
	public DragAndDropHandler getHandler(final DragAndDropData data,
		final Display display)
	{
		for (final DragAndDropHandler handler : getInstances()) {
			if (handler.supportsData(data, display)) return handler;
		}
		return null;
	}

	@Override
	public DragAndDropHandler getHandler(final Object object,
		final Display display)
	{
		for (final DragAndDropHandler handler : getInstances()) {
			if (handler.supportsObject(object, display)) return handler;
		}
		return null;
	}

	// -- PTService methods --

	@Override
	@SuppressWarnings({"rawtypes", "unchecked"})
	public Class> getPluginType() {
		return (Class) DragAndDropHandler.class;
	}

	// -- Typed methods --

	@Override
	public Class