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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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 *    this list of conditions and the following disclaimer.
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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();
	}

}