Any way to create a URL from a byte array?

Question

Is there any way to create a URL from a byte array? I have a custom class loader which stores all the entries from a JarInputStream in a HashMap storing the entry names with their bytes. The reason I'm looking to create a URL from a byte array is to satisfy the getResource(String name) method found in ClassLoaders. I've already accomplished getResourceAsStream(String name) by using a ByteArrayInputStream.

Answer 1

Assuming that you use a custom classloader and you want to store/cache the bytes of the content in a hashmap (not a location in byte[] form). Than you have the same question which brought me here. But this is how I was able to solve this:

class SomeClassLoader {
    private final Map<String, byte[]> entries = new HashMap<>();

    public URL getResource(String name) {

        try {
            return new URL(null, "bytes:///" + name, new BytesHandler());
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }

    }

    class BytesHandler extends URLStreamHandler {
        @Override
        protected URLConnection openConnection(URL u) throws IOException {
            return new ByteUrlConnection(u);
        }
    }

    class ByteUrlConnection extends URLConnection {
        public ByteUrlConnection(URL url) {
            super(url);
        }

        @Override
        public void connect() throws IOException {
        }

        @Override
        public InputStream getInputStream() throws IOException {
            return new ByteArrayInputStream(entries.get(this.getURL().getPath().substring(1)));
        }
    }
}