org.scijava.main.DefaultMainService Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of scijava-common Show documentation

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.

There is a newer version: 2.99.0

Show newest version

/*
 * #%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;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.AbstractService;
import org.scijava.service.Service;
import org.scijava.util.ClassUtils;

/**
 * Default implementation of {@link MainService}.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = Service.class)
public class DefaultMainService extends AbstractService implements MainService {

	@Parameter(required = false)
	private LogService log;

	private final List mains = new ArrayList<>();

	@Override
	public int execMains() {
		int mainCount = 0;
		for (final Main main : mains) {
			main.exec();
			mainCount++;
		}
		return mainCount;
	}

	@Override
	public void addMain(final String className, final String... args) {
		mains.add(new DefaultMain(className, args));
	}

	@Override
	public Main[] getMains() {
		return mains.toArray(new Main[mains.size()]);
	}

	// -- Helper classes --

	/** Default implementation of {@link MainService.Main}. */
	private class DefaultMain implements Main {
		private String className;
		private String[] args;

		public DefaultMain(final String className, final String... args) {
			this.className = className;
			this.args = args.clone();
		}

		@Override
		public String className() {
			return className;
		}

		@Override
		public String[] args() {
			return args;
		}

		@Override
		public void exec() {
			try {
				final Class mainClass = ClassUtils.loadClass(className, false);
				final Method main = mainClass.getMethod("main", String[].class);
				main.invoke(null, new Object[] { args });
			}
			catch (final IllegalArgumentException exc) {
				if (log != null) log.error(exc);
			}
			catch (final NoSuchMethodException exc) {
				if (log != null) {
					log.error("No main method for class: " + className, exc);
				}
			}
			catch (final IllegalAccessException exc) {
				if (log != null) log.error(exc);
			}
			catch (final InvocationTargetException exc) {
				if (log != null) log.error(exc);
			}
		}
	}

}