001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.webengine.loader;
023
024import org.nuxeo.ecm.core.api.NuxeoException;
025
026/**
027 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
028 */
029public class LazyClassProxy implements ClassProxy {
030
031    protected final String className;
032
033    protected final ClassLoader loader;
034
035    protected Class<?> clazz;
036
037    public LazyClassProxy(ClassLoader loader, String className) {
038        this.loader = loader;
039        this.className = className;
040    }
041
042    @Override
043    public String getClassName() {
044        return className;
045    }
046
047    public ClassLoader getLoader() {
048        return loader;
049    }
050
051    @Override
052    public Class<?> get() {
053        if (clazz == null) {
054            try {
055                clazz = loader.loadClass(className);
056            } catch (ReflectiveOperationException e) {
057                throw new NuxeoException("Failed to load class " + className, e);
058            }
059        }
060        return clazz;
061    }
062
063    public void reset() {
064        clazz = null;
065    }
066
067    @Override
068    public String toString() {
069        return className;
070    }
071
072}