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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, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
 * 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
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package org.scijava.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.jar.Attributes;

import org.scijava.Versioned;

/**
 * Helper class for working with JAR manifests.
 * 
 * @author Curtis Rueden
 */
public class Manifest implements Versioned {

	/** The JAR manifest backing this object. */
	private final java.util.jar.Manifest manifest;

	/** Creates a new instance wrapping the given JAR manifest. */
	private Manifest(final java.util.jar.Manifest manifest) {
		this.manifest = manifest;
	}

	// -- Manifest methods --

	public String getArchiverVersion() {
		return get("Archiver-Version");
	}

	public String getBuildJdk() {
		return get("Build-Jdk");
	}

	public String getBuiltBy() {
		return get("Built-By");
	}

	public String getCreatedBy() {
		return get("Created-By");
	}

	public String getImplementationBuild() {
		return get("Implementation-Build");
	}

	public String getImplementationDate() {
		return get("Implementation-Date");
	}

	public String getImplementationTitle() {
		return get("Implementation-Title");
	}

	public String getImplementationVendor() {
		return get("Implementation-Vendor");
	}

	public String getImplementationVendorId() {
		return get("Implementation-Vendor-Id");
	}

	public String getImplementationVersion() {
		return get("Implementation-Version");
	}

	public String getManifestVersion() {
		return get("Manifest-Version");
	}

	public String getPackage() {
		return get("Package");
	}

	public String getSpecificationTitle() {
		return get("Specification-Title");
	}

	public String getSpecificationVendor() {
		return get("Specification-Vendor");
	}

	public String getSpecificationVersion() {
		return get("Specification-Version");
	}

	public String get(final String key) {
		if (manifest == null) return null;
		final Attributes mainAttrs = manifest.getMainAttributes();
		if (mainAttrs == null) return null;
		return mainAttrs.getValue(key);
	}

	public Map getAll() {
		if (manifest == null) return null;
		final Attributes mainAttrs = manifest.getMainAttributes();
		if (mainAttrs == null) return null;
		return Collections.unmodifiableMap(mainAttrs);
	}

	// -- Utility methods --

	/** Gets the JAR manifest associated with the given class. */
	public static Manifest getManifest(final Class c) {
		try {
			return getManifest(new URL("jar:" + Types.location(c) + "!/"));
		}
		catch (final IOException e) {
			return null;
		}
	}

	/**
	 * Gets the JAR manifest associated with the given XML document. Assumes the
	 * XML document was loaded as a resource from inside a JAR.
	 */
	public static Manifest getManifest(final XML xml) throws IOException {
		final String path = xml.getPath();
		if (path == null || !path.startsWith("file:")) return null;
		final int dotJAR = path.indexOf(".jar!/");
		return getManifest(new File(path.substring(5, dotJAR + 4)));
	}

	/** Gets the JAR manifest associated with the given JAR file. */
	public static Manifest getManifest(final File jarFile) throws IOException {
		if (!jarFile.exists()) throw new FileNotFoundException();
		return getManifest(new URL("jar:file:" + jarFile.getAbsolutePath() + "!/"));
	}

	private static Manifest getManifest(final URL jarURL) throws IOException {
		final JarURLConnection conn = (JarURLConnection) jarURL.openConnection();
		return new Manifest(conn.getManifest());
	}

	// -- Versioned methods --

	@Override
	public String getVersion() {
		final String v = getBaseVersion();
		if (v == null || !v.endsWith("-SNAPSHOT")) return v;

		// append commit hash to differentiate between development versions
		final String buildNumber = getImplementationBuild();
		return buildNumber == null ? v : v + "-" + buildNumber;
	}

	// -- Helper methods --

	private String getBaseVersion() {
		final String manifestVersion = getImplementationVersion();
		if (manifestVersion != null) return manifestVersion;
		return getSpecificationVersion();
	}

}