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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 both ImageJ and SCIFIO.

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/*
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 * SciJava Common shared library for SciJava software.
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
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 *    this list of conditions and the following disclaimer.
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package org.scijava.module.process;

import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.ModuleService;
import org.scijava.plugin.Parameter;

/**
 * Abstract superclass for {@link PreprocessorPlugin} implementations that
 * populate singleton inputs. Contains helper methods to facilitate this
 * functionality.
 *
 * @author Mark Hiner
 */
public abstract class AbstractSingleInputPreprocessor extends
	AbstractPreprocessorPlugin
{

	@Parameter
	private ModuleService moduleService;

	/**
	 * Helper method to look up the name of singleton module inputs of a given
	 * type.
	 *
	 * @param module Module to check for single input
	 * @param type Type of single input to look for
	 * @return If the given module has exactly one input of the specified type,
	 *         return that input's name. Otherwise null;
	 */
	protected String getSingleInput(final Module module, final Class type) {
		if (moduleService == null) return null;
		final ModuleItem item = moduleService.getSingleInput(module, type);
		if (item == null || !item.isAutoFill()) return null;

		return item.getName();
	}

}