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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 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
 * 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
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package org.scijava.io;

import java.io.IOException;

import org.scijava.event.EventService;
import org.scijava.io.event.DataOpenedEvent;
import org.scijava.io.event.DataSavedEvent;
import org.scijava.log.LogService;
import org.scijava.plugin.AbstractHandlerService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;

/**
 * Default implementation of {@link IOService}.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = Service.class)
public final class DefaultIOService
	extends AbstractHandlerService> implements IOService
{

	@Parameter
	private LogService log;

	@Parameter
	private EventService eventService;

	// -- IOService methods --

	@Override
	public Object open(final String source) throws IOException {
		final IOPlugin opener = getOpener(source);
		if (opener == null) return null; // no appropriate IOPlugin

		final Object data = opener.open(source);
		if (data == null) return null; // IOPlugin returned no data; canceled?

		eventService.publish(new DataOpenedEvent(source, data));
		return data;
	}

	@Override
	public void save(final Object data, final String destination)
		throws IOException
	{
		final IOPlugin