FilteredURLClassLoader.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010 Red Hat Inc. and/or its affiliates and other contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.arquillian.container.impl;

import java.net.URL;
import java.net.URLClassLoader;

/**
 * FilteredURLClassLoader
 *
 * @author <a href="mailto:aslak@redhat.com">Aslak Knutsen</a>
 * @version $Revision: $
 */
public class FilteredURLClassLoader extends URLClassLoader {

    private String regExpFilter;

    public FilteredURLClassLoader(URL[] urls, String regExpFilter) {
        super(urls);
        this.regExpFilter = regExpFilter;
    }

    public java.lang.Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
        if (!name.matches(regExpFilter)) {
            Class<?> c = findLoadedClass(name);
            if (c == null) {
                URL resource = super.findResource(name.replace('.', '/').concat(".class"));
                if (resource != null) {
                    c = super.findClass(name);
                }
            }
            if (c != null) // class found locally
            {
                return c;
            }
        }
        try {
            return getParent().loadClass(name);
        } catch (ClassNotFoundException e) {
            return super.loadClass(name, resolve);
        }
    }

    public java.net.URL getResource(String name) {
        java.net.URL url = null;
        if (!name.matches(regExpFilter)) {
            url = findResource(name);
            if (url == null) {
                url = super.findResource(name);
            }
            if (url != null) {
                return url;
            }
        }
        url = getParent().getResource(name);
        if (url == null) {
            return super.getResource(name);
        }
        return url;
    }
}