Java Resource Get getResourceListing(ClassLoader cl)

Description

get Resource Listing

License

Open Source License

Declaration

public static List<String> getResourceListing(ClassLoader cl) throws URISyntaxException, IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    public static List<String> getResourceListing(ClassLoader cl) throws URISyntaxException, IOException {
        URL dirURL = cl.getResource("");
        if (dirURL != null && dirURL.getProtocol().equals("file")) {
            File f = new File(dirURL.toURI());
            return recurse(f, f.getAbsolutePath().replace('\\', '/'));
        }/*  w ww.j av a2s.  c o m*/

        if (dirURL.getProtocol().equals("jar")) {
            String jarPath = dirURL.getPath().substring(5, dirURL.getPath().indexOf("!"));
            JarFile jar = new JarFile(URLDecoder.decode(jarPath, "UTF-8"));
            Enumeration<JarEntry> entries = jar.entries();
            Set<String> result = new HashSet<String>();
            while (entries.hasMoreElements())
                result.add("/" + entries.nextElement().getName().replace('\\', '/'));
            jar.close();
            return new ArrayList<String>(result);
        }

        throw new UnsupportedOperationException("Cannot list files for URL " + dirURL);
    }

    public static List<String> getResourceListing(ClassLoader cl, String prefix)
            throws URISyntaxException, IOException {
        List<String> l = getResourceListing(cl);
        for (Iterator<String> it = l.iterator(); it.hasNext();) {
            String s = it.next();
            if (!s.startsWith(prefix))
                it.remove();
        }
        return l;
    }

    private static List<String> recurse(File dir, List<String> append, String relative) {
        if (append == null)
            append = new ArrayList<String>();
        for (File f : dir.listFiles()) {
            if (f.isDirectory())
                recurse(f, append, relative);
            else
                append.add(f.getAbsolutePath().replace('\\', '/').substring(relative.length()));
        }
        return append;
    }

    public static List<String> recurse(File directory, String relative) {
        return recurse(directory, null, relative);
    }

    public static List<String> recurse(File directory) {
        return recurse(directory, null, "/");
    }
}

Related

1. getResourceFile(Class clazz, String fileName)
2. getResourceFile(String name)
3. getResourceFromBundle(Class clazz, String location)
4. getResourceFromFile(String filename)
5. getResourceInBundleOrFragments(Bundle bundle, String name)
6. getResourceMessage(Locale locale, String resource, String key, Object... params)
7. getResourceReader(Class clazz, String name, String charset)
8. getResources(String archiveName)
9. getResources(String pkgName)