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Uber-fast, ultra-lightweight Java classpath scanner. Scans the classpath by parsing the classfile binary format directly rather than by using reflection. See https://github.com/lukehutch/fast-classpath-scanner

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/*
 * This file is part of FastClasspathScanner.
 *
 * Author: Luke Hutchison
 *
 * Hosted at: https://github.com/lukehutch/fast-classpath-scanner
 *
 * --
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Luke Hutchison
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without
 * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */
package io.github.lukehutch.fastclasspathscanner.classloaderhandler;

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

import io.github.lukehutch.fastclasspathscanner.scanner.ClasspathOrder;
import io.github.lukehutch.fastclasspathscanner.scanner.ScanSpec;
import io.github.lukehutch.fastclasspathscanner.utils.LogNode;

/** ClassLoaderHandler that is able to extract the URLs from a URLClassLoader. */
public class URLClassLoaderHandler implements ClassLoaderHandler {
    @Override
    public String[] handledClassLoaders() {
        return new String[] { "java.net.URLClassLoader" };
    }

    @Override
    public DelegationOrder getDelegationOrder(final ClassLoader classLoaderInstance) {
        return DelegationOrder.PARENT_FIRST;
    }

    @Override
    public void handle(final ScanSpec scanSpec, final ClassLoader classLoader,
            final ClasspathOrder classpathOrderOut, final LogNode log) {
        final URL[] urls = ((URLClassLoader) classLoader).getURLs();
        if (urls != null) {
            for (final URL url : urls) {
                if (url != null) {
                    classpathOrderOut.addClasspathElement(url.toString(), classLoader, log);
                }
            }
        }
    }
}