/*
 * #%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.
 * 
 * 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
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

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<String, IOPlugin<?>> implements IOService
{

	@Parameter
	private LogService log;

	@Parameter
	private EventService eventService;

	// -- IOService methods --

	@Override
	public IOPlugin<?> getOpener(final String source) {
		for (final IOPlugin<?> handler : getInstances()) {
			if (handler.supportsOpen(source)) return handler;
		}
		return null;
	}

	@Override
	public <D> IOPlugin<D> getSaver(final D data, final String destination) {
		for (final IOPlugin<?> handler : getInstances()) {
			if (handler.supportsSave(data, destination)) {
				@SuppressWarnings("unchecked")
				final IOPlugin<D> typedHandler = (IOPlugin<D>) handler;
				return typedHandler;
			}
		}
		return null;
	}

	@Override
	public Object open(final String source) throws IOException {
		IOPlugin<?> opener = getOpener(source);
		Object data = null;
		if (opener != null) {
			data= opener.open(source);
		}
		if (data != null) {
			eventService.publish(new DataOpenedEvent(source, data));
		}
		return data;
	}

	@Override
	public void save(final Object data, final String destination)
		throws IOException
	{
		IOPlugin<Object> saver = getSaver(data, destination);
		if (saver != null) {
			saver.save(data, destination);
		}
		eventService.publish(new DataSavedEvent(destination, data));
	}

	// -- HandlerService methods --

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

	@Override
	public Class<String> getType() {
		return String.class;
	}

}

@@ -2900,24 +2900,30 @@
 ception %7B%0A%09%09
+final 
 IOPlugin%3C?%3E 
@@ -2954,30 +2954,8 @@
 e);%0A
-%09%09Object data = null;%0A
 %09%09if
@@ -2963,25 +2963,25 @@
 (opener 
-!
+=
 = null) 
 %7B%0A%09%09%09dat
@@ -2976,17 +2976,69 @@
 ll) 
-%7B%0A%09%09%09
+return null; // no appropriate IOPlugin%0A%0A%09%09final Object 
 data
+ 
 = op
@@ -3056,20 +3056,16 @@
 ource);%0A
-%09%09%7D%0A
 %09%09if (da
@@ -3067,25 +3067,25 @@
 f (data 
-!
+=
 = null) 
 %7B%0A%09%09%09eve
@@ -3076,19 +3076,70 @@
 = null) 
-%7B%0A%09
+return null; // IOPlugin returned no data; canceled?%0A%0A
 %09%09eventS
@@ -3189,20 +3189,16 @@
 data));%0A
-%09%09%7D%0A
 %09%09return

Clean up DefaultIOService style