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}