org.apache.juneau.utils.ManifestFile Maven / Gradle / Ivy
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package org.apache.juneau.utils;
import static org.apache.juneau.internal.IOUtils.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.jar.*;
import org.apache.juneau.*;
/**
* Utility class for working with Jar manifest files.
*
*
* Copies the contents of a {@link Manifest} into an {@link ObjectMap} so that the various convenience methods on that
* class can be used to retrieve values.
*/
public class ManifestFile extends ObjectMap {
private static final long serialVersionUID = 1L;
/**
* Create an instance of this class from a manifest file on the file system.
*
* @param f The manifest file.
* @throws IOException If a problem occurred while trying to read the manifest file.
*/
public ManifestFile(File f) throws IOException {
Manifest mf = new Manifest();
try (FileInputStream fis = new FileInputStream(f)) {
mf.read(fis);
load(mf);
} catch (IOException e) {
throw new IOException("Problem detected in MANIFEST.MF. Contents below:\n" + read(f), e);
}
}
/**
* Create an instance of this class from a {@link Manifest} object.
*
* @param f The manifest to read from.
*/
public ManifestFile(Manifest f) {
load(f);
}
/**
* Finds and loads the manifest file of the jar file that the specified class is contained within.
*
* @param c The class to get the manifest file of.
* @throws IOException If a problem occurred while trying to read the manifest file.
*/
public ManifestFile(Class c) throws IOException {
String className = c.getSimpleName() + ".class";
String classPath = c.getResource(className).toString();
if (! classPath.startsWith("jar")) {
return;
}
String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) + "/META-INF/MANIFEST.MF";
try {
Manifest mf = new Manifest(new URL(manifestPath).openStream());
load(mf);
} catch (MalformedURLException e) {
throw new IOException(e);
} catch (IOException e) {
e.printStackTrace();
}
}
private void load(Manifest mf) {
for (Map.Entry e : mf.getMainAttributes().entrySet())
put(e.getKey().toString(), e.getValue().toString());
}
}