Add URL to CLASSPATH - Android java.lang.reflect

Android examples for java.lang.reflect:Class

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Description

Add URL to CLASSPATH

Demo Code


import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import org.apache.log4j.Logger;

public class Main{
    private static Logger LOGGER = Logger.getLogger(ClasspathUtils.class
            .getName());/*ww w . j  a v  a 2s .  c  o  m*/
    @SuppressWarnings("rawtypes")
    private static final Class[] parameters = new Class[] { URL.class };
    /**
     * Add URL to CLASSPATH
     * 
     * @param u
     *            URL
     * @throws IOException
     *             IOException
     */
    public static void addURL(URL u) throws IOException {
        ClasspathUtils.LOGGER.info("adding to classpath");
        URLClassLoader sysLoader = (URLClassLoader) ClassLoader
                .getSystemClassLoader();
        URL urls[] = sysLoader.getURLs();

        ClasspathUtils.LOGGER.info(urls.length);
        if (ClasspathUtils.isURLInClassPath(urls, u)) {
            ClasspathUtils.LOGGER.info("already in classpath: " + u);
            return;
        }

        Class<URLClassLoader> sysclass = URLClassLoader.class;
        try {
            Method method = sysclass.getDeclaredMethod("addURL",
                    ClasspathUtils.parameters);
            method.setAccessible(true);
            method.invoke(sysLoader, new Object[] { u });
        } catch (Throwable t) {
            t.printStackTrace();
            throw new IOException(
                    "Error, could not add URL to system classloader");
        }
    }
    public static boolean isURLInClassPath(URL[] urls, URL u) {
        for (int i = 0; i < urls.length; i++) {
            if (urls[i].toString().equalsIgnoreCase(u.toString())) {
                ClasspathUtils.LOGGER.info("URL " + u
                        + " is already in the CLASSPATH");
                return true;
            }
        }
        return false;
    }
}

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