jdk12support.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.tomcat.util.compat;

import java.net.*;
import java.util.*;
import java.security.*;
/**
 *  
 */
public class Jdk12Support extends Jdk11Compat {


    /** Return a class loader. For JDK1.2+ will return a URLClassLoader.
     *  For JDK1.1 will return the util.SimepleClassLoader
     */
    public ClassLoader newClassLoaderInstance( URL urls[],
					       ClassLoader parent )
    {
	return URLClassLoader.newInstance( urls, parent );
    }


    public Object doPrivileged( Action action ) throws Exception {
	Object proxy=action.getProxy();
	if( proxy==null ) {
	    proxy=new PrivilegedProxy(action);
	    action.setProxy( proxy );
	}

	try {
	    return AccessController.
		doPrivileged((PrivilegedExceptionAction)proxy);
	} catch( PrivilegedActionException pe ) {
	    Exception e = pe.getException();
	    throw e;
	}
    }

    public void setContextClassLoader( ClassLoader cl ) {
	// we can't doPrivileged here - it'll be a major security
	// problem
	Thread.currentThread().setContextClassLoader(cl);
    }

    public ClassLoader getContextClassLoader() {
	return Thread.currentThread().getContextClassLoader();
    }

    public URL[] getURLs(ClassLoader cl){
        return ((URLClassLoader)cl).getURLs();
    }
    public URL[] getParentURLs(ClassLoader cl){
        URLClassLoader scl=(URLClassLoader)cl;
        return ((URLClassLoader)cl.getParent()).getURLs();
    }

    // -------------------- Support -------------------- 
    static class PrivilegedProxy implements PrivilegedExceptionAction
    {
	Action action;
	PrivilegedProxy( Action act ) {
	    action=act;
	}
	public Object run() throws Exception
	{
	    return action.run();
	}
    }

}