001/*
002 * The FML Forge Mod Loader suite.
003 * Copyright (C) 2012 cpw
004 *
005 * This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free
006 * Software Foundation; either version 2.1 of the License, or any later version.
007 *
008 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
009 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
010 *
011 * You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51
012 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
013 */
014
015package cpw.mods.fml.common;
016
017import java.lang.reflect.Field;
018import java.lang.reflect.Modifier;
019import java.util.Set;
020import java.util.logging.Level;
021
022import cpw.mods.fml.common.discovery.ASMDataTable;
023import cpw.mods.fml.common.discovery.ASMDataTable.ASMData;
024import cpw.mods.fml.relauncher.Side;
025
026/**
027 * @author cpw
028 *
029 */
030public class ProxyInjector
031{
032    public static void inject(ModContainer mod, ASMDataTable data, Side side)
033    {
034        FMLLog.fine("Attempting to inject @SidedProxy classes into %s", mod.getModId());
035        Set<ASMData> targets = data.getAnnotationsFor(mod).get(SidedProxy.class.getName());
036        ClassLoader mcl = Loader.instance().getModClassLoader();
037
038        for (ASMData targ : targets)
039        {
040            try
041            {
042                Class<?> proxyTarget = Class.forName(targ.getClassName(), true, mcl);
043                Field target = proxyTarget.getDeclaredField(targ.getObjectName());
044                if (target == null)
045                {
046                    // Impossible?
047                    FMLLog.severe("Attempted to load a proxy type into %s.%s but the field was not found", targ.getClassName(), targ.getObjectName());
048                    throw new LoaderException();
049                }
050
051                String targetType = side.isClient() ? target.getAnnotation(SidedProxy.class).clientSide() : target.getAnnotation(SidedProxy.class).serverSide();
052                Object proxy=Class.forName(targetType, true, mcl).newInstance();
053
054                if ((target.getModifiers() & Modifier.STATIC) == 0 )
055                {
056                    FMLLog.severe("Attempted to load a proxy type %s into %s.%s, but the field is not static", targetType, targ.getClassName(), targ.getObjectName());
057                    throw new LoaderException();
058                }
059                if (!target.getType().isAssignableFrom(proxy.getClass()))
060                {
061                    FMLLog.severe("Attempted to load a proxy type %s into %s.%s, but the types don't match", targetType, targ.getClassName(), targ.getObjectName());
062                    throw new LoaderException();
063                }
064                target.set(null, proxy);
065            }
066            catch (Exception e)
067            {
068                FMLLog.log(Level.SEVERE, e, "An error occured trying to load a proxy into %s.%s", targ.getAnnotationInfo(), targ.getClassName(), targ.getObjectName());
069                throw new LoaderException(e);
070            }
071        }
072    }
073}