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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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/*
 * #%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;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

/**
 * Abstract superclass of {@link Module} implementations.
 * 
 * By default, input and output values are stored in {@link HashMap}s.
 * 
 * 
 * @author Curtis Rueden
 */
public abstract class AbstractModule implements Module {

	private final HashMap inputs;
	private final HashMap outputs;

	/** Table indicating resolved inputs. */
	private final HashSet resolvedInputs;

	private MethodRef initializerRef;

	public AbstractModule() {
		inputs = new HashMap();
		outputs = new HashMap();
		resolvedInputs = new HashSet();
	}

	// -- Module methods --

	@Override
	public void preview() {
		// do nothing by default
	}

	@Override
	public void cancel() {
		// do nothing by default
	}

	@Override
	public void initialize() throws MethodCallException {
		// execute global module initializer
		final Object delegateObject = getDelegateObject();
		if (initializerRef == null) {
			final String initializer = getInfo().getInitializer();
			initializerRef = new MethodRef(delegateObject.getClass(), initializer);
		}
		initializerRef.execute(delegateObject);

		// execute individual module item initializers
		for (final ModuleItem item : getInfo().inputs()) {
			item.initialize(this);
		}
	}

	@Override
	public Object getDelegateObject() {
		return this;
	}

	@Override
	public Object getInput(final String name) {
		return inputs.get(name);
	}

	@Override
	public Object getOutput(final String name) {
		return outputs.get(name);
	}

	@Override
	public Map getInputs() {
		return createMap(getInfo().inputs(), false);
	}

	@Override
	public Map getOutputs() {
		return createMap(getInfo().outputs(), true);
	}

	@Override
	public void setInput(final String name, final Object value) {
		inputs.put(name, value);
	}

	@Override
	public void setOutput(final String name, final Object value) {
		outputs.put(name, value);
	}

	@Override
	public void setInputs(final Map inputs) {
		for (final String name : inputs.keySet()) {
			setInput(name, inputs.get(name));
		}
	}

	@Override
	public void setOutputs(final Map outputs) {
		for (final String name : outputs.keySet()) {
			setOutput(name, outputs.get(name));
		}
	}

	@Override
	public boolean isResolved(final String name) {
		return resolvedInputs.contains(name);
	}

	@Override
	public void setResolved(final String name, final boolean resolved) {
		if (resolved) resolvedInputs.add(name);
		else resolvedInputs.remove(name);
	}

	// -- Helper methods --

	private Map createMap(final Iterable> items,
		final boolean outputMap)
	{
		final Map map = new HashMap();
		for (final ModuleItem item : items) {
			final String name = item.getName();
			final Object value = outputMap ? getOutput(name) : getInput(name);
			map.put(name, value);
		}
		return map;
	}

}