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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 - 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.
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package org.scijava.ui.dnd;

import java.io.File;
import java.io.IOException;

import org.scijava.Priority;
import org.scijava.display.Display;
import org.scijava.display.DisplayService;
import org.scijava.io.IOService;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * Drag-and-drop handler for files.
 * 
 * @author Curtis Rueden
 * @author Barry DeZonia
 */
@Plugin(type = DragAndDropHandler.class, priority = Priority.LOW_PRIORITY)
public class FileDragAndDropHandler extends
	AbstractDragAndDropHandler
{

	@Parameter(required = false)
	private IOService ioService;

	@Parameter(required = false)
	private DisplayService displayService;

	@Parameter(required = false)
	private LogService log;

	// -- DragAndDropHandler methods --

	@Override
	public boolean supports(final File file) {
		if (ioService == null || displayService == null) return false;
		if (!super.supports(file)) return false;

		// verify that the file can be opened somehow
		return ioService.getOpener(file.getAbsolutePath()) != null;
	}

	@Override
	public boolean drop(final File file, final Display display) {
		if (ioService == null || displayService == null) return false;
		check(file, display);
		if (file == null) return true; // trivial case

		// load the data
		final String filename = file.getAbsolutePath();
		final Object data;
		try {
			data = ioService.open(filename);
		}
		catch (final IOException exc) {
			if (log != null) log.error("Error opening file: " + filename, exc);
			return false;
		}

		// display the result
		displayService.createDisplay(data);
		return true;
	}

	// -- Typed methods --

	@Override
	public Class getType() {
		return File.class;
	}

}