org.bimserver.plugins.EclipsePluginClassloader.java Source code

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Here is the source code for org.bimserver.plugins.EclipsePluginClassloader.java

Source

package org.bimserver.plugins;

/******************************************************************************
 * Copyright (C) 2009-2012  BIMserver.org
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *****************************************************************************/

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EclipsePluginClassloader extends ClassLoader {

    private static final Logger LOGGER = LoggerFactory.getLogger(EclipsePluginClassloader.class);
    private final Map<String, Class<?>> loadedClasses = new HashMap<String, Class<?>>();
    private final File projectFolder;
    private File classFolder;

    public EclipsePluginClassloader(ClassLoader parentClassloader, File projectFolder) {
        super(parentClassloader);
        this.projectFolder = projectFolder;
        this.classFolder = new File(projectFolder, "bin");
    }

    @Override
    protected URL findResource(String name) {
        File file = new File(projectFolder, name);
        if (file.exists()) {
            try {
                return file.toURI().toURL();
            } catch (MalformedURLException e) {
                LOGGER.error("", e);
            }
        }
        return null;
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        String filename = name.replace(".", File.separator) + ".class";
        if (loadedClasses.containsKey(filename)) {
            return loadedClasses.get(filename);
        }
        File classFile = new File(classFolder, filename);
        if (classFile.isFile()) {
            try {
                byte[] bytes = FileUtils.readFileToByteArray(classFile);
                Class<?> definedClass = defineClass(name, bytes, 0, bytes.length);
                if (definedClass != null) {
                    loadedClasses.put(filename, definedClass);
                    return definedClass;
                }
            } catch (IOException e) {
                LOGGER.error("", e);
            }
        }
        throw new ClassNotFoundException(name);
    }
}