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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.display;

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

/**
 * Assigns the active {@link Display} when there is one single unresolved
 * {@link Display} parameter. Hence, rather than a dialog prompting the user to
 * choose a {@link Display}, the active {@link Display} is used automatically.
 * 
 * In the case of more than one {@link Display} parameter, the active
 * {@link Display} is not used and instead the user must select. This behavior
 * is consistent with ImageJ v1.x.
 * 
 * 
 * @author Curtis Rueden
 */
@Plugin(type = PreprocessorPlugin.class,
	priority = Priority.VERY_HIGH_PRIORITY)
public class ActiveDisplayPreprocessor extends AbstractPreprocessorPlugin {

	@Parameter(required = false)
	private DisplayService displayService;

	@Parameter(required = false)
	private ModuleService moduleService;

	// -- ModuleProcessor methods --

	@Override
	public void process(final Module module) {
		if (displayService == null || moduleService == null) return;

		final ModuleItem displayInput =
			moduleService.getSingleInput(module, Display.class);
		if (displayInput == null || !displayInput.isAutoFill()) return;

		@SuppressWarnings("unchecked")
		final Class> displayType =
			(Class>) displayInput.getType();

		final Display activeDisplay =
			displayService.getActiveDisplay(displayType);
		if (activeDisplay == null) return;

		final String name = displayInput.getName();
		module.setInput(name, activeDisplay);
		module.setResolved(name, true);
	}

}