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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 - 2014 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
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.scijava.widget;

import org.scijava.plugin.AbstractWrapperPlugin;

/**
 * Base class for input widgets.
 * 
 * @author Curtis Rueden
 * @param  The input type of the widget.
 * @param  The type of UI component housing the widget.
 */
public abstract class AbstractInputWidget extends
	AbstractWrapperPlugin implements InputWidget
{

	private WidgetModel widgetModel;

	// -- InputWidget methods --

	@Override
	public void updateModel() {
		widgetModel.setValue(getValue());
	}

	@Override
	public boolean isLabeled() {
		return true;
	}

	@Override
	public boolean isMessage() {
		return false;
	}

	// -- WrapperPlugin methods --

	@Override
	public void set(final WidgetModel model) {
		if (widgetModel != null) {
			throw new IllegalStateException("Widget already initialized");
		}
		widgetModel = model;
	}

	@Override
	public WidgetModel get() {
		return widgetModel;
	}

	// -- Typed methods --

	@Override
	public boolean supports(final WidgetModel model) {
		// check compatibility with the intended input panel
		return model.getPanel().supports(this);
	}

	@Override
	public Class getType() {
		return WidgetModel.class;
	}

}