CombinedClassLoader.java

package ddth.dasp.framework.model;

import java.net.URL;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CombinedClassLoader extends ClassLoader {
    private final Logger LOGGER = LoggerFactory.getLogger(CombinedClassLoader.class);

    private Set<ClassLoader> loaders = new HashSet<ClassLoader>();

    public CombinedClassLoader() {
    }

    public CombinedClassLoader(Collection<ClassLoader> classLoaders) {
        for (ClassLoader classLoader : classLoaders) {
            addLoader(classLoader);
        }
    }

    public void addLoader(ClassLoader loader) {
        if (loader != null) {
            loaders.add(loader);
        }
    }

    public void addLoader(Class<?> clazz) {
        addLoader(clazz.getClassLoader());
    }

    public Class<?> findClass(String name) throws ClassNotFoundException {
        for (ClassLoader loader : loaders) {
            try {
                return loader.loadClass(name);
            } catch (ClassNotFoundException cnfe) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug(cnfe.getMessage());
                }
            }
        }
        throw new ClassNotFoundException(name);
    }

    public URL getResource(String name) {
        for (ClassLoader loader : loaders) {
            URL url = loader.getResource(name);
            if (url != null) {
                return url;
            }
        }
        return null;
    }
}