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 * Institute of Molecular Cell Biology and Genetics, University of
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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.Types;

/**
 * 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 = Types.load(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);
			}
		}
	}

}