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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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/*
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 * SciJava Common shared library for SciJava software.
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
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 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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package org.scijava.ui.dnd;

import java.io.File;

import org.scijava.display.Display;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.script.ScriptService;

/**
 * Drag-and-drop handler for script files.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = DragAndDropHandler.class)
public class ScriptFileDragAndDropHandler extends
	AbstractDragAndDropHandler
{

	@Parameter(required = false)
	private ScriptService scriptService;

	// -- DragAndDropHandler methods --

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

		// TODO: Use the script service to open the file in the script editor.
		// We may also want to be context sensitive about which type of display
		// received the drop:
		// - If it's the main window, open a new Script Editor window.
		// - If it's an existing Script Editor window, open a new tab.
		// -- This will require the Script Editor windows to be Displays.
		// - Should a drop onto any other displays do anything?

		return true;
	}

	// -- Typed methods --

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

		// verify that the file is a script
		return scriptService.canHandleFile(file);
	}

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

}