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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 - 2016 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
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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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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.scijava.options;

import java.util.List;

import org.scijava.command.CommandService;
import org.scijava.log.LogService;
import org.scijava.object.ObjectService;
import org.scijava.plugin.AbstractSingletonService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;

/**
 * Default service for keeping track of the available options and their
 * settings.
 * 
 * @author Curtis Rueden
 * @author Barry DeZonia
 * @see OptionsPlugin
 */
@Plugin(type = Service.class)
public class DefaultOptionsService extends
	AbstractSingletonService implements OptionsService
{

	@Parameter
	private LogService log;

	@Parameter
	private ObjectService objectService;

	// NB: Required by DynamicCommand, the OptionsPlugin superclass.
	@Parameter
	private CommandService commandService;

	// -- OptionsService methods --

	@Override
	public  O getOptions(final Class optionsClass) {
		final List objects = objectService.getObjects(optionsClass);
		return objects == null || objects.isEmpty() ? null : objects.get(0);
	}

	@Override
	public void reset() {
		final List optionsPlugins = getInstances();
		for (final OptionsPlugin plugin : optionsPlugins) {
			plugin.reset();
		}
	}

	// -- SingletonService methods --

	@Override
	public List getInstances() {
		final List instances = super.getInstances();

		// load previous values from persistent storage
		for (final OptionsPlugin options : instances) {
			options.load();
		}

		return instances;
	}

	// -- PTService methods --

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

}