Java Class Loader getManifest(ClassLoader cl, String extension)

Description

Returns the manifest of the jar which contains the specified extension.

License

Open Source License

Parameter

Parameter	Description
cl	A ClassLoader which should find the manifest.
extension	The value of the 'Extension-Name' jar-manifest attribute; used to identify the manifest.

Return

the requested manifest or null when not found.

Declaration

public static Manifest getManifest(ClassLoader cl, String extension) 

Method Source Code

//package com.java2s;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

import java.util.jar.Attributes;
import java.util.jar.Manifest;

public class Main {
    /**//from   w ww  .j a  v  a2  s. c o  m
     * Returns the manifest of the jar which contains the specified extension.
     * The provided ClassLoader is used for resource loading.
     * @param cl A ClassLoader which should find the manifest.
     * @param extension The value of the 'Extension-Name' jar-manifest attribute; used to identify the manifest.
     * @return the requested manifest or null when not found.
     */
    public static Manifest getManifest(ClassLoader cl, String extension) {
        try {
            Enumeration resources = cl.getResources("META-INF/MANIFEST.MF");
            while (resources.hasMoreElements()) {
                Manifest manifest = new Manifest(((URL) resources.nextElement()).openStream());
                Attributes attributes = manifest.getMainAttributes();
                if (attributes != null && extension.equals(attributes.getValue(Attributes.Name.EXTENSION_NAME))) {
                    return manifest;
                }
            }
        } catch (IOException ex) {
            throw new RuntimeException("Unable to read manifest.", ex);
        }
        return null;
    }
}

Related

1. getCustomClassloader(List entries)
2. getFileFromClassLoader(String fileName)
3. getFilesByPackgeName(String packageName, File _file, ClassLoader classLoader, List list)
4. getJvmExtClassLoader()
5. getLoadingDir(Class clazz)
6. getPackageFolder(String packageName, ClassLoader classLoader)
7. getParentClassLoader()
8. getProjectClassLoader(IJavaProject javaProject)
9. getProjectClassLoader(IJavaProject javaProject, ClassLoader parentClassLoader)