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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 both ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2016 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.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import javax.xml.ws.Service;

/**
 * Combines {@link Service} information from all JAR files on the classpath.
 * 
 * @author Johannes Schindelin
 * @author Mark Hiner
 */
public class ServiceCombiner implements Combiner {

	private static final String SERVICES_PREFIX = "META-INF/services/";

	@Override
	public void combine(final File outputDirectory) throws IOException {

		final Map files =
			new HashMap();
		final Enumeration directories =
			Thread.currentThread().getContextClassLoader().getResources(
				SERVICES_PREFIX);

		// Iterate over all the service files
		while (directories.hasMoreElements()) {
			for (final URL url : FileUtils.listContents(directories.nextElement())) {
				final String urlString = url.toString();
				if (urlString.endsWith("/")) {
					continue;
				}
				final String fileName =
					urlString.substring(urlString.lastIndexOf('/') + 1);
				StringBuilder builder = files.get(fileName);
				if (builder == null) {
					builder = new StringBuilder();
					// Create a base entry for a service type
					files.put(fileName, builder);
				}
				final InputStreamReader reader =
					new InputStreamReader(url.openStream());
				final BufferedReader buffered = new BufferedReader(reader);
				for (;;) {
					final String line = buffered.readLine();
					if (line == null) {
						break;
					}
					builder.append(line).append('\n');
				}
				buffered.close();
			}
		}

		if (files.isEmpty()) {
			return;
		}

		// Write the unified serice files
		final File servicesDirectory = new File(outputDirectory, SERVICES_PREFIX);
		servicesDirectory.mkdirs();
		for (final Entry entry : files.entrySet()) {
			final FileWriter writer =
				new FileWriter(new File(servicesDirectory, entry.getKey()));
			writer.write(entry.getValue().toString());
			writer.close();
		}
	}

	// -- Main method --

	public static void main(final String... args) throws IOException {
		new ServiceCombiner().combine(args.length > 0 ? new File(args[0]) : null);
	}
}