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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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/*
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 * SciJava Common shared library for SciJava software.
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 * 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
 *    and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.scijava.menu;

/**
 * Abstract helper class for generating a menu structure.
 * 
 * The class differentiates between top-level menu components (such as
 * {@link javax.swing.JMenuBar}), and hierarchical menu components (such as
 * {@link javax.swing.JMenu}).
 * 
 * 
 * @author Curtis Rueden
 * @param  Top-level menu class to populate (e.g.,
 *          {@link javax.swing.JMenuBar} or {@link javax.swing.JMenu} or
 *          {@link java.awt.MenuBar})
 * @param  Hierarchical menu class (e.g., {@link javax.swing.JMenu} or
 *          {@link java.awt.Menu})
 */
public abstract class AbstractMenuCreator implements MenuCreator {

	// -- MenuCreator methods --

	@Override
	public void createMenus(final ShadowMenu root, final T target) {
		double lastWeight = Double.NaN;
		for (final ShadowMenu child : root.getChildren()) {
			final double weight = child.getMenuEntry().getWeight();
			final double difference = Math.abs(weight - lastWeight);
			if (difference > 1) addSeparatorToTop(target);
			lastWeight = weight;
			if (child.isLeaf()) {
				addLeafToTop(child, target);
			}
			else {
				final M nonLeaf = addNonLeafToTop(child, target);
				populateMenu(child, nonLeaf);
			}
		}
	}

	// -- Internal methods --

	protected abstract void addLeafToMenu(ShadowMenu shadow, M target);

	protected abstract void addLeafToTop(ShadowMenu shadow, T target);

	protected abstract M addNonLeafToMenu(ShadowMenu shadow, M target);

	protected abstract M addNonLeafToTop(ShadowMenu shadow, T target);

	protected abstract void addSeparatorToMenu(M target);

	protected abstract void addSeparatorToTop(T target);

	// -- Helper methods --

	private void populateMenu(final ShadowMenu shadow, final M target) {
		double lastWeight = Double.NaN;
		for (final ShadowMenu child : shadow.getChildren()) {
			final double weight = child.getMenuEntry().getWeight();
			final double difference = Math.abs(weight - lastWeight);
			if (difference > 1) addSeparatorToMenu(target);
			lastWeight = weight;
			if (child.isLeaf()) {
				addLeafToMenu(child, target);
			}
			else {
				final M nonLeaf = addNonLeafToMenu(child, target);
				populateMenu(child, nonLeaf);
			}
		}
	}

}