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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
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package org.scijava;

import org.scijava.app.App;
import org.scijava.app.AppService;
import org.scijava.app.SciJavaApp;
import org.scijava.app.StatusService;
import org.scijava.command.CommandService;
import org.scijava.console.ConsoleService;
import org.scijava.convert.ConvertService;
import org.scijava.display.DisplayService;
import org.scijava.event.EventHistory;
import org.scijava.event.EventService;
import org.scijava.input.InputService;
import org.scijava.io.IOService;
import org.scijava.io.RecentFileService;
import org.scijava.log.LogService;
import org.scijava.main.MainService;
import org.scijava.menu.MenuService;
import org.scijava.module.ModuleService;
import org.scijava.object.ObjectService;
import org.scijava.options.OptionsService;
import org.scijava.platform.AppEventService;
import org.scijava.platform.PlatformService;
import org.scijava.plugin.AbstractRichPlugin;
import org.scijava.plugin.PluginService;
import org.scijava.prefs.PrefService;
import org.scijava.script.ScriptService;
import org.scijava.service.Service;
import org.scijava.text.TextService;
import org.scijava.thread.ThreadService;
import org.scijava.tool.IconService;
import org.scijava.tool.ToolService;
import org.scijava.ui.UIService;
import org.scijava.widget.WidgetService;

/**
 * Abstract superclass for {@link Gateway} implementations.
 * 
 * @author Mark Hiner
 * @author Curtis Rueden
 */
public abstract class AbstractGateway extends AbstractRichPlugin implements
	Gateway
{

	private final String appName;

	// -- Constructor --

	public AbstractGateway() {
		this(SciJavaApp.NAME, null);
	}

	public AbstractGateway(final String appName, final Context context) {
		this.appName = appName;
		if (context != null) setContext(context);
	}

	// -- Gateway methods --

	@Override
	public void launch(final String... args) {
		// parse command line arguments
		console().processArgs(args);

		// launch main methods
		final int mainCount = main().execMains();

		// display the user interface (NB: does not block)
		// NB: When running headless, the HeadlessUI will be used.
		if (mainCount == 0) ui().showUI();

		if (ui().isHeadless()) {
			// now that CLI processing/execution is done, we can shut down
			getContext().dispose();
		}
	}

	@Override
	public String getShortName() {
		return getClass().getSimpleName().toLowerCase();
	}

	@Override
	public  S get(final Class serviceClass) {
		return context().service(serviceClass);
	}

	@Override
	public Service get(final String serviceClassName) {
		return context().service(serviceClassName);
	}

	// -- Gateway methods - services --

	@Override
	public AppEventService appEvent() {
		return get(AppEventService.class);
	}

	@Override
	public AppService app() {
		return get(AppService.class);
	}

	@Override
	public CommandService command() {
		return get(CommandService.class);
	}

	@Override
	public ConsoleService console() {
		return get(ConsoleService.class);
	}

	public ConvertService convert() {
		return get(ConvertService.class);
	}

	@Override
	public DisplayService display() {
		return get(DisplayService.class);
	}

	@Override
	public EventHistory eventHistory() {
		return get(EventHistory.class);
	}

	@Override
	public EventService event() {
		return get(EventService.class);
	}

	@Override
	public IconService icon() {
		return get(IconService.class);
	}

	@Override
	public InputService input() {
		return get(InputService.class);
	}

	@Override
	public IOService io() {
		return get(IOService.class);
	}

	@Override
	public LogService log() {
		return get(LogService.class);
	}

	@Override
	public MainService main() {
		return get(MainService.class);
	}

	@Override
	public MenuService menu() {
		return get(MenuService.class);
	}

	@Override
	public ModuleService module() {
		return get(ModuleService.class);
	}

	@Override
	public ObjectService object() {
		return get(ObjectService.class);
	}

	@Override
	public OptionsService options() {
		return get(OptionsService.class);
	}

	@Override
	public PlatformService platform() {
		return get(PlatformService.class);
	}

	@Override
	public PluginService plugin() {
		return get(PluginService.class);
	}

	public PrefService prefs() {
		return get(PrefService.class);
	}

	@Override
	public RecentFileService recentFile() {
		return get(RecentFileService.class);
	}

	@Override
	public ScriptService script() {
		return get(ScriptService.class);
	}

	@Override
	public StatusService status() {
		return get(StatusService.class);
	}

	@Override
	public TextService text() {
		return get(TextService.class);
	}

	@Override
	public ThreadService thread() {
		return get(ThreadService.class);
	}

	@Override
	public ToolService tool() {
		return get(ToolService.class);
	}

	@Override
	public UIService ui() {
		return get(UIService.class);
	}

	@Override
	public WidgetService widget() {
		return get(WidgetService.class);
	}

	// -- Gateway methods - application --

	@Override
	public App getApp() {
		return app().getApp(appName);
	}

	@Override
	public String getTitle() {
		return getApp().getTitle();
	}

	@Override
	public String getInfo(final boolean mem) {
		return getApp().getInfo(mem);
	}

	// -- Versioned methods --

	@Override
	public String getVersion() {
		return getApp().getVersion();
	}

}