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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
 * 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.module.process;

import org.scijava.Cancelable;
import org.scijava.Priority;
import org.scijava.log.LogService;
import org.scijava.module.MethodCallException;
import org.scijava.module.Module;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * A preprocessor plugin that populates initial parameter values.
 * 
 * This is done via a single call to {@link Module#initialize()}.
 * 
 * 
 * @author Curtis Rueden
 */
@Plugin(type = PreprocessorPlugin.class, priority = Priority.HIGH_PRIORITY)
public class InitPreprocessor extends AbstractPreprocessorPlugin {

	@Parameter(required = false)
	private LogService log;

	// -- ModuleProcessor methods --

	@Override
	public void process(final Module module) {
		try {
			module.initialize();
			if (isCanceled(module)) cancel(getCancelReason(module));
		}
		catch (final MethodCallException exc) {
			if (log != null) log.error(exc);
			final String moduleClass = module.getInfo().getDelegateClassName();
			cancel("The module \"" + moduleClass + "\" failed to initialize.");
		}
	}

	// -- Helper methods --

	private boolean isCanceled(final Module module) {
		return module instanceof Cancelable && ((Cancelable) module).isCanceled();
	}

	private String getCancelReason(final Module module) {
		if (!(module instanceof Cancelable)) return null;
		final String cancelReason = ((Cancelable) module).getCancelReason();
		return cancelReason == null ? "" : cancelReason;
	}

}