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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, 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
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package org.scijava.ui;

import org.scijava.Priority;
import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.process.AbstractPreprocessorPlugin;
import org.scijava.module.process.PreprocessorPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * The UI preprocessor automatically populates module {@link UserInterface}
 * inputs with the {@link UIService}'s default UI instance, if compatible.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = PreprocessorPlugin.class, priority = Priority.VERY_HIGH_PRIORITY)
public class UIPreprocessor extends AbstractPreprocessorPlugin {

	@Parameter(required = false)
	private UIService uiService;

	// -- ModuleProcessor methods --

	@Override
	public void process(final Module module) {
		if (uiService == null) return; // no UI service available

		final UserInterface ui = uiService.getDefaultUI();
		if (ui == null) return; // no default UI

		for (final ModuleItem input : module.getInfo().inputs()) {
			if (!input.isAutoFill()) continue; // cannot auto-fill this input
			final Class type = input.getType();
			if (type.isAssignableFrom(ui.getClass())) {
				// input is a compatible UI
				final String name = input.getName();
				module.setInput(name, ui);
				module.resolveInput(name);
			}
		}
	}

}