langtools/src/jdk.jshell/share/classes/jdk/internal/jshell/remote/RemoteClassLoader.java

/*
 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.internal.jshell.remote;

import java.net.URL;
import java.net.URLClassLoader;
import java.security.CodeSource;
import java.util.Map;
import java.util.TreeMap;

/**
 * Class loader wrapper which caches class files by name until requested.
 * @author Robert Field
 */
class RemoteClassLoader extends URLClassLoader {

    private final Map<String, byte[]> classObjects = new TreeMap<>();

    RemoteClassLoader() {
        super(new URL[0]);
    }

    void delare(String name, byte[] bytes) {
        classObjects.put(name, bytes);
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        byte[] b = classObjects.get(name);
        if (b == null) {
            return super.findClass(name);
        }
        return super.defineClass(name, b, 0, b.length, (CodeSource) null);
    }

    @Override
    public void addURL(URL url) {
        super.addURL(url);
    }

}