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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.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;
	}

}