DelegateLastClassLoader.java

package net.rkunze.maven.compiler.jsr308javac;

/**
 * The MIT License
 *
 * Copyright (c) 20014, Richard Kunze
 *
 * 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.
 */

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

public class DelegateLastClassLoader extends URLClassLoader {

    public DelegateLastClassLoader(URL[] urls) {
        super(urls);
    }

    @Override
    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
        synchronized (getClassLoadingLock(name)) {
            Class<?> c = findLoadedClass(name);
            if (c == null) {
                if (!name.startsWith("java.")) {
                    try {
                        c = findClass(name);
                    } catch (ClassNotFoundException e) {
                        if (getParent() != null) {
                            c = getParent().loadClass(name);
                        } else {
                            c = getSystemClassLoader().loadClass(name);
                        }
                    }
                } else {
                    c = getSystemClassLoader().loadClass(name);
                }
            }
            if (resolve) {
                resolveClass(c);
            }
            return c;
        }
    }
    
    
}