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Support for OSGi integration

There is a newer version: 12.1.0.alpha0

//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.osgi.util;

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

/**
 * FakeURLClassLoader
 * 
 * A URLClassloader that overrides the getURLs() method to return the list
 * of urls passed in to the constructor, but otherwise acts as if it has no
 * urls, which would cause it to delegate to the parent classloader (in this
 * case an OSGi classloader).
 * 
 * The main use of this class is with jars containing tlds. Jasper expects a
 * URL classloader to inspect for jars with tlds.
 */
public class FakeURLClassLoader extends URLClassLoader
{
    private URL[] _jars;

    public FakeURLClassLoader(ClassLoader osgiClassLoader, URL[] jars)
    {
        super(new URL[]{}, osgiClassLoader);
        _jars = jars;
    }

    /**
     * @return the jars that contains tlds so that TldLocationsCache or
     * TldScanner can find them.
     */
    @Override
    public URL[] getURLs()
    {
        return _jars;
    }

    @Override
    public String toString()
    {
        StringBuilder builder = new StringBuilder();

        if (_jars != null)
        {
            for (URL u : _jars)
            {
                builder.append(" " + u.toString());
            }
            return builder.toString();
        }
        else
            return super.toString();
    }
}