001/*
002  GRANITE DATA SERVICES
003  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005  This file is part of Granite Data Services.
006
007  Granite Data Services is free software; you can redistribute it and/or modify
008  it under the terms of the GNU Library General Public License as published by
009  the Free Software Foundation; either version 2 of the License, or (at your
010  option) any later version.
011
012  Granite Data Services is distributed in the hope that it will be useful, but
013  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015  for more details.
016
017  You should have received a copy of the GNU Library General Public License
018  along with this library; if not, see <http://www.gnu.org/licenses/>.
019*/
020
021package org.granite.scan;
022
023import java.io.IOException;
024import java.net.URL;
025import java.net.URLClassLoader;
026
027/**
028 * @author Franck WOLFF
029 */
030public class ScannedItemClassLoader extends URLClassLoader {
031
032    public ScannedItemClassLoader(URLClassLoader parent) {
033        this(new URL[0], parent);
034    }
035
036    public ScannedItemClassLoader(URL[] urls, URLClassLoader parent) {
037        super(urls, parent);
038    }
039
040    public Class<?> loadClass(ScannedItem item) throws IOException, ClassFormatError {
041        String name = item.getClassName();
042
043        Class<?> clazz = findLoadedClass(name);
044        if (clazz == null) {
045
046            SecurityManager securityManager = System.getSecurityManager();
047            if (securityManager != null) {
048                int iLastDot = name.lastIndexOf('.');
049                if (iLastDot != -1)
050                    securityManager.checkPackageAccess(name.substring(0, iLastDot));
051            }
052
053            byte[] data = item.getContent();
054            clazz = defineClass(name, data, 0, data.length);
055        }
056        return clazz;
057    }
058}
059