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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, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
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 * 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
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package org.scijava.module;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.scijava.AbstractUIDetails;
import org.scijava.util.Types;

/**
 * Abstract superclass of {@link ModuleInfo} implementation.
 * 
 * By default, {@link ModuleItem}s are stored in {@link HashMap}s and
 * {@link ArrayList}s, internally.
 * 
 * 
 * @author Curtis Rueden
 */
public abstract class AbstractModuleInfo extends AbstractUIDetails implements
	ModuleInfo
{

	/** Table of inputs, keyed on name. */
	private HashMap> inputMap;

	/** Table of outputs, keyed on name. */
	private HashMap> outputMap;

	/** Ordered list of input items. */
	private ArrayList> inputList;

	/** Ordered list of output items. */
	private ArrayList> outputList;

	/** Whether lazy initialization is complete. */
	private boolean initialized;

	// -- ModuleInfo methods --

	@Override
	public ModuleItem getInput(final String name) {
		return inputMap().get(name);
	}

	@Override
	public  ModuleItem getInput(final String name, final Class type) {
		return castItem(getInput(name), type);
	}

	@Override
	public ModuleItem getOutput(final String name) {
		return outputMap().get(name);
	}

	@Override
	public  ModuleItem getOutput(final String name, final Class type) {
		return castItem(getOutput(name), type);
	}

	@Override
	public Iterable> inputs() {
		return Collections.unmodifiableList(inputList());
	}

	@Override
	public Iterable> outputs() {
		return Collections.unmodifiableList(outputList());
	}

	// -- Internal methods --

	/**
	 * Parses input and output parameters. Intended to be overridden by concrete
	 * subclasses.
	 */
	protected void parseParameters() {
		// NB: Do nothing by default.
	}

	/** Clears input and output parameters. */
	protected void clearParameters() {
		inputMap.clear();
		outputMap.clear();
		inputList.clear();
		outputList.clear();
	}

	/**
	 * Adds an input. Intended to be called from overridden
	 * {@link #parseParameters()} methods.
	 */
	protected void registerInput(final ModuleItem input) {
		inputMap.put(input.getName(), input);
		inputList.add(input);
	}

	/**
	 * Adds an output. Intended to be called from overridden
	 * {@link #parseParameters()} methods.
	 */
	protected void registerOutput(final ModuleItem output) {
		outputMap.put(output.getName(), output);
		outputList.add(output);
	}

	/** Gets {@link #inputMap}, initializing if needed. */
	protected Map> inputMap() {
		if (!initialized) initParameters();
		return inputMap;
	}

	/** Gets {@link #inputList}, initializing if needed. */
	protected Map> outputMap() {
		if (!initialized) initParameters();
		return outputMap;
	}

	/** Gets {@link #outputMap}, initializing if needed. */
	protected List> inputList() {
		if (!initialized) initParameters();
		return inputList;
	}

	/** Gets {@link #outputList}, initializing if needed. */
	protected List> outputList() {
		if (!initialized) initParameters();
		return outputList;
	}

	// -- Helper methods --

	private  ModuleItem castItem(final ModuleItem item,
		final Class type)
	{
		final Class itemType = item.getType();
		// if (!type.isAssignableFrom(itemType)) {
		final Class saneItemType = Types.box(itemType);
		if (!Types.isAssignable(type, saneItemType)) {
			throw new IllegalArgumentException("Type " + type.getName() +
				" is incompatible with item of type " + itemType.getName());
		}
		@SuppressWarnings("unchecked")
		final ModuleItem typedItem = (ModuleItem) item;
		return typedItem;
	}

	// -- Helper methods - lazy initialization --

	/** Initializes data structures and parses parameters. */
	private synchronized void initParameters() {
		if (initialized) return; // already initialized

		inputMap = new HashMap<>();
		outputMap = new HashMap<>();
		inputList = new ArrayList<>();
		outputList = new ArrayList<>();

		parseParameters();

		initialized = true;
	}

}