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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, 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
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.main.run;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

import org.scijava.Priority;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.run.AbstractCodeRunner;
import org.scijava.run.CodeRunner;
import org.scijava.util.ClassUtils;

/**
 * Executes the given class's {@code main} method.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = CodeRunner.class, priority = Priority.LOW_PRIORITY)
public class MainCodeRunner extends AbstractCodeRunner {

	@Parameter(required = false)
	private LogService log;

	// -- CodeRunner methods --

	@Override
	public void run(final Object code, final Object... args)
		throws InvocationTargetException
	{
		final Object[] sArgs = stringify(args);
		try {
			getMain(code).invoke(null, new Object[] { sArgs });
		}
		catch (final IllegalArgumentException exc) {
			throw new InvocationTargetException(exc);
		}
		catch (final IllegalAccessException exc) {
			throw new InvocationTargetException(exc);
		}
	}

	@Override
	public void run(final Object code, final Map inputMap)
		throws InvocationTargetException
	{
		throw new UnsupportedOperationException(
			"Cannot execute main method with a map of inputs");
	}

	// -- Typed methods --

	@Override
	public boolean supports(final Object code) {
		return getMain(code) != null;
	}

	// -- Helper methods --

	private Method getMain(final Object code) {
		final Class c = getClass(code);
		if (c == null) return null;
		try {
			return c.getMethod("main", String[].class);
		}
		catch (final SecurityException exc) {
			if (log != null) log.debug(exc);
			return null;
		}
		catch (final NoSuchMethodException exc) {
			if (log != null) log.debug(exc);
			return null;
		}
	}

	private Class getClass(final Object code) {
		if (code instanceof Class) return (Class) code;
		if (code instanceof String) return ClassUtils.loadClass((String) code);
		return null;
	}

	/** Ensures each element is a {@link String}. */
	private String[] stringify(final Object... o) {
		final String[] s;
		if (o == null) s = null;
		else {
			s = new String[o.length];
			for (int i = 0; i < o.length; i++) {
				if (o[i] == null) s[i] = null;
				else if (o[i] instanceof String) s[i] = (String) o[i];
				else s[i] = o[i].toString();
			}
		}
		return s;
	}

}