001/*
002 * (C) Copyright 2006-2008 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     bstefanescu
016 *
017 * $Id$
018 */
019
020package org.nuxeo.ecm.webengine.loader;
021
022import org.nuxeo.ecm.webengine.WebException;
023
024/**
025 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
026 */
027public class LazyClassProxy implements ClassProxy {
028
029    protected final String className;
030
031    protected final ClassLoader loader;
032
033    protected Class<?> clazz;
034
035    public LazyClassProxy(ClassLoader loader, String className) {
036        this.loader = loader;
037        this.className = className;
038    }
039
040    public String getClassName() {
041        return className;
042    }
043
044    public ClassLoader getLoader() {
045        return loader;
046    }
047
048    public Class<?> get() {
049        if (clazz == null) {
050            try {
051                clazz = loader.loadClass(className);
052            } catch (ReflectiveOperationException e) {
053                throw WebException.wrap("Failed to load class " + className, e);
054            }
055        }
056        return clazz;
057    }
058
059    public void reset() {
060        clazz = null;
061    }
062
063    @Override
064    public String toString() {
065        return className;
066    }
067
068}