Java Class Loader addDirectoryToClassLoader(ClassLoader loader, File directory)

Description

add Directory To Class Loader

License

Apache License

Declaration

public static boolean addDirectoryToClassLoader(ClassLoader loader, File directory) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;

public class Main {
    public static boolean addDirectoryToClassLoader(ClassLoader loader, File directory) {
        try {// ww w.  java  2 s . c o  m
            ClassLoader rootLoader = getRootLoader(loader);
            if (rootLoader == null) {
                return false;
            } else {
                URL url = directory.toURI().toURL();
                Method method = rootLoader.getClass().getMethod("addURL", URL.class);
                method.invoke(rootLoader, url);
                return true;
            }

        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    private static ClassLoader getRootLoader(ClassLoader loader) {

        if (loader == null) {
            return null;
        } else if (isRootClassLoader(loader)) {
            return loader;
        } else {
            return getRootLoader(loader.getParent());
        }
    }

    private static boolean isRootClassLoader(ClassLoader loader) {
        return (loader != null) && isRootLoaderClass(loader.getClass());
    }

    private static boolean isRootLoaderClass(Class<?> loaderClass) {
        return (loaderClass != null) && ((loaderClass.getName() == "groovy.lang.GroovyClassLoader")
                || (loaderClass.getName() == "org.codehaus.groovy.tools.RootLoader")
                || isRootLoaderClass(loaderClass.getSuperclass()));
    }
}

Related

1. addFileToSystemClassLoader(String s)
2. createClassloader(File libDir, ClassLoader cl)
3. createClassLoader(File root)
4. createClassLoader(final String[] cpEntries)