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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
 * 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.platform;

import java.io.IOException;
import java.net.URL;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.scijava.command.CommandService;
import org.scijava.event.EventHandler;
import org.scijava.event.EventService;
import org.scijava.log.LogService;
import org.scijava.platform.event.AppMenusCreatedEvent;
import org.scijava.plugin.AbstractSingletonService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;

/**
 * Default service for handling platform-specific deployment issues.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = Service.class)
public final class DefaultPlatformService extends
	AbstractSingletonService implements PlatformService
{

	@Parameter
	private LogService log;

	@Parameter
	private EventService eventService;

	@Parameter
	private CommandService commandService;

	@Parameter
	private AppEventService appEventService;

	/** Platform handlers applicable to this platform. */
	private List targetPlatforms;

	// -- PlatformService methods --

	@Override
	public EventService eventService() {
		return eventService;
	}

	@Override
	public CommandService commandService() {
		return commandService;
	}

	@Override
	public AppEventService getAppEventService() {
		return appEventService;
	}

	@Override
	public List getTargetPlatforms() {
		return targetPlatforms;
	}

	@Override
	public void open(final URL url) throws IOException {
		IOException exception = null;
		for (final Platform platform : getTargetPlatforms()) {
			try {
				platform.open(url);
				return;
			}
			catch (final IOException e) {
				if (exception == null) exception = e;
			}
		}
		if (exception != null) throw exception;

		log.error("Could not find a browser; URL=" + url);
		throw new IOException("No browser found");
	}

	@Override
	public int exec(final String... args) throws IOException {
		final Process process = Runtime.getRuntime().exec(args);
		try {
			process.waitFor();
			return process.exitValue();
		}
		catch (final InterruptedException ie) {
			throw new IOException("InterruptedException during execution: " +
				ie.getMessage());
		}
	}

	@Override
	public boolean registerAppMenus(final Object menus) {
		for (final Platform platform : getTargetPlatforms()) {
			if (platform.registerAppMenus(menus)) return true;
		}
		return false;
	}

	@Override
	public List filterInstances(final List list) {
		final Iterator iter = list.iterator();
		while (iter.hasNext()) {
			if (!iter.next().isTarget()) {
				iter.remove();
			}
		}
		return list;
	}

	// -- PTService methods --

	@Override
	public Class getPluginType() {
		return Platform.class;
	}

	// -- Service methods --

	@Override
	public void initialize() {
		super.initialize();

		// configure target platforms
		final List platforms = getInstances();
		targetPlatforms = Collections.unmodifiableList(platforms);
		for (final Platform platform : platforms) {
			log.debug("Configuring platform: " + platform.getClass().getName());
			platform.configure(this);
		}
		if (platforms.size() == 0) log.debug("No platforms to configure.");
	}

	// -- Disposable methods --

	@Override
	public void dispose() {
		for (final Platform p : targetPlatforms) {
			p.dispose();
		}
	}

	// -- Event handlers --

	@EventHandler
	protected void onEvent(final AppMenusCreatedEvent event) {
		if (registerAppMenus(event.getMenus())) event.consume();
	}

}