package test;

import java.net.URL;
import java.net.URLConnection;
import java.io.InputStream;

/**
 * Loads class bytes from a URL, such as
 * "http://www.mindspring.com/~happyjac/".
 *
 * @author Jack Harich - 8/30/97
 */
public class URLClassLoader extends MultiClassLoader {

//---------- Private Fields ------------------------------
private String    urlString;

//---------- Initialization ------------------------------
public URLClassLoader(String urlString) {
    this.urlString = urlString;
}
//---------- Abstract Implementation ---------------------
protected byte[] loadClassBytes(String className) {

    className = formatClassName(className);
    try {
        URL url = new URL(urlString + className);
        URLConnection connection = url.openConnection();
        if (sourceMonitorOn) {
            print("Loading from URL: " + connection.getURL() );
        }
        monitor("Content type is: " + connection.getContentType());

        InputStream inputStream = connection.getInputStream();
        int length = connection.getContentLength();
        monitor("InputStream length = " + length); // Failure if -1

        byte[] data = new byte[length];
        inputStream.read(data); // Actual byte transfer
        inputStream.close();
        return data;

    } catch(Exception ex) {
        print("### URLClassLoader.loadClassBytes() - Exception:");
        ex.printStackTrace();
        return null;
    }
}

} // End class